diff options
Diffstat (limited to 'drivers/clk/clk-lmk04832.c')
| -rw-r--r-- | drivers/clk/clk-lmk04832.c | 1579 |
1 files changed, 1579 insertions, 0 deletions
diff --git a/drivers/clk/clk-lmk04832.c b/drivers/clk/clk-lmk04832.c new file mode 100644 index 000000000..f416f8bc2 --- /dev/null +++ b/drivers/clk/clk-lmk04832.c @@ -0,0 +1,1579 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * LMK04832 Ultra Low-Noise JESD204B Compliant Clock Jitter Cleaner + * Pin compatible with the LMK0482x family + * + * Datasheet: https://www.ti.com/lit/ds/symlink/lmk04832.pdf + * + * Copyright (c) 2020, Xiphos Systems Corp. + * + */ + +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/debugfs.h> +#include <linux/device.h> +#include <linux/gcd.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/uaccess.h> +#include <linux/regmap.h> +#include <linux/spi/spi.h> + +/* 0x000 - 0x00d System Functions */ +#define LMK04832_REG_RST3W 0x000 +#define LMK04832_BIT_RESET BIT(7) +#define LMK04832_BIT_SPI_3WIRE_DIS BIT(4) +#define LMK04832_REG_POWERDOWN 0x002 +#define LMK04832_REG_ID_DEV_TYPE 0x003 +#define LMK04832_REG_ID_PROD_MSB 0x004 +#define LMK04832_REG_ID_PROD_LSB 0x005 +#define LMK04832_REG_ID_MASKREV 0x006 +#define LMK04832_REG_ID_VNDR_MSB 0x00c +#define LMK04832_REG_ID_VNDR_LSB 0x00d + +/* 0x100 - 0x137 Device Clock and SYSREF Clock Output Control */ +#define LMK04832_REG_CLKOUT_CTRL0(ch) (0x100 + (ch >> 1) * 8) +#define LMK04832_BIT_DCLK_DIV_LSB GENMASK(7, 0) +#define LMK04832_REG_CLKOUT_CTRL1(ch) (0x101 + (ch >> 1) * 8) +#define LMK04832_BIT_DCLKX_Y_DDLY_LSB GENMASK(7, 0) +#define LMK04832_REG_CLKOUT_CTRL2(ch) (0x102 + (ch >> 1) * 8) +#define LMK04832_BIT_CLKOUTX_Y_PD BIT(7) +#define LMK04832_BIT_DCLKX_Y_DDLY_PD BIT(4) +#define LMK04832_BIT_DCLKX_Y_DDLY_MSB GENMASK(3, 2) +#define LMK04832_BIT_DCLK_DIV_MSB GENMASK(1, 0) +#define LMK04832_REG_CLKOUT_SRC_MUX(ch) (0x103 + (ch % 2) + (ch >> 1) * 8) +#define LMK04832_BIT_CLKOUT_SRC_MUX BIT(5) +#define LMK04832_REG_CLKOUT_CTRL3(ch) (0x103 + (ch >> 1) * 8) +#define LMK04832_BIT_DCLKX_Y_PD BIT(4) +#define LMK04832_BIT_DCLKX_Y_DCC BIT(2) +#define LMK04832_BIT_DCLKX_Y_HS BIT(0) +#define LMK04832_REG_CLKOUT_CTRL4(ch) (0x104 + (ch >> 1) * 8) +#define LMK04832_BIT_SCLK_PD BIT(4) +#define LMK04832_BIT_SCLKX_Y_DIS_MODE GENMASK(3, 2) +#define LMK04832_REG_SCLKX_Y_ADLY(ch) (0x105 + (ch >> 1) * 8) +#define LMK04832_REG_SCLKX_Y_DDLY(ch) (0x106 + (ch >> 1) * 8) +#define LMK04832_BIT_SCLKX_Y_DDLY GENMASK(3, 0) +#define LMK04832_REG_CLKOUT_FMT(ch) (0x107 + (ch >> 1) * 8) +#define LMK04832_BIT_CLKOUT_FMT(ch) (ch % 2 ? 0xf0 : 0x0f) +#define LMK04832_VAL_CLKOUT_FMT_POWERDOWN 0x00 +#define LMK04832_VAL_CLKOUT_FMT_LVDS 0x01 +#define LMK04832_VAL_CLKOUT_FMT_HSDS6 0x02 +#define LMK04832_VAL_CLKOUT_FMT_HSDS8 0x03 +#define LMK04832_VAL_CLKOUT_FMT_LVPECL1600 0x04 +#define LMK04832_VAL_CLKOUT_FMT_LVPECL2000 0x05 +#define LMK04832_VAL_CLKOUT_FMT_LCPECL 0x06 +#define LMK04832_VAL_CLKOUT_FMT_CML16 0x07 +#define LMK04832_VAL_CLKOUT_FMT_CML24 0x08 +#define LMK04832_VAL_CLKOUT_FMT_CML32 0x09 +#define LMK04832_VAL_CLKOUT_FMT_CMOS_OFF_INV 0x0a +#define LMK04832_VAL_CLKOUT_FMT_CMOS_NOR_OFF 0x0b +#define LMK04832_VAL_CLKOUT_FMT_CMOS_INV_INV 0x0c +#define LMK04832_VAL_CLKOUT_FMT_CMOS_INV_NOR 0x0d +#define LMK04832_VAL_CLKOUT_FMT_CMOS_NOR_INV 0x0e +#define LMK04832_VAL_CLKOUT_FMT_CMOS_NOR_NOR 0x0f + +/* 0x138 - 0x145 SYSREF, SYNC, and Device Config */ +#define LMK04832_REG_VCO_OSCOUT 0x138 +#define LMK04832_BIT_VCO_MUX GENMASK(6, 5) +#define LMK04832_VAL_VCO_MUX_VCO0 0x00 +#define LMK04832_VAL_VCO_MUX_VCO1 0x01 +#define LMK04832_VAL_VCO_MUX_EXT 0x02 +#define LMK04832_REG_SYSREF_OUT 0x139 +#define LMK04832_BIT_SYSREF_REQ_EN BIT(6) +#define LMK04832_BIT_SYSREF_MUX GENMASK(1, 0) +#define LMK04832_VAL_SYSREF_MUX_NORMAL_SYNC 0x00 +#define LMK04832_VAL_SYSREF_MUX_RECLK 0x01 +#define LMK04832_VAL_SYSREF_MUX_PULSER 0x02 +#define LMK04832_VAL_SYSREF_MUX_CONTINUOUS 0x03 +#define LMK04832_REG_SYSREF_DIV_MSB 0x13a +#define LMK04832_BIT_SYSREF_DIV_MSB GENMASK(4, 0) +#define LMK04832_REG_SYSREF_DIV_LSB 0x13b +#define LMK04832_REG_SYSREF_DDLY_MSB 0x13c +#define LMK04832_BIT_SYSREF_DDLY_MSB GENMASK(4, 0) +#define LMK04832_REG_SYSREF_DDLY_LSB 0x13d +#define LMK04832_REG_SYSREF_PULSE_CNT 0x13e +#define LMK04832_REG_FB_CTRL 0x13f +#define LMK04832_BIT_PLL2_RCLK_MUX BIT(7) +#define LMK04832_VAL_PLL2_RCLK_MUX_OSCIN 0x00 +#define LMK04832_VAL_PLL2_RCLK_MUX_CLKIN 0x01 +#define LMK04832_BIT_PLL2_NCLK_MUX BIT(5) +#define LMK04832_VAL_PLL2_NCLK_MUX_PLL2_P 0x00 +#define LMK04832_VAL_PLL2_NCLK_MUX_FB_MUX 0x01 +#define LMK04832_BIT_FB_MUX_EN BIT(0) +#define LMK04832_REG_MAIN_PD 0x140 +#define LMK04832_BIT_PLL1_PD BIT(7) +#define LMK04832_BIT_VCO_LDO_PD BIT(6) +#define LMK04832_BIT_VCO_PD BIT(5) +#define LMK04832_BIT_OSCIN_PD BIT(4) +#define LMK04832_BIT_SYSREF_GBL_PD BIT(3) +#define LMK04832_BIT_SYSREF_PD BIT(2) +#define LMK04832_BIT_SYSREF_DDLY_PD BIT(1) +#define LMK04832_BIT_SYSREF_PLSR_PD BIT(0) +#define LMK04832_REG_SYNC 0x143 +#define LMK04832_BIT_SYNC_CLR BIT(7) +#define LMK04832_BIT_SYNC_1SHOT_EN BIT(6) +#define LMK04832_BIT_SYNC_POL BIT(5) +#define LMK04832_BIT_SYNC_EN BIT(4) +#define LMK04832_BIT_SYNC_MODE GENMASK(1, 0) +#define LMK04832_VAL_SYNC_MODE_OFF 0x00 +#define LMK04832_VAL_SYNC_MODE_ON 0x01 +#define LMK04832_VAL_SYNC_MODE_PULSER_PIN 0x02 +#define LMK04832_VAL_SYNC_MODE_PULSER_SPI 0x03 +#define LMK04832_REG_SYNC_DIS 0x144 + +/* 0x146 - 0x14a CLKin Control */ +#define LMK04832_REG_CLKIN_SEL0 0x148 +#define LMK04832_REG_CLKIN_SEL1 0x149 +#define LMK04832_REG_CLKIN_RST 0x14a +#define LMK04832_BIT_SDIO_RDBK_TYPE BIT(6) +#define LMK04832_BIT_CLKIN_SEL_MUX GENMASK(5, 3) +#define LMK04832_VAL_CLKIN_SEL_MUX_SPI_RDBK 0x06 +#define LMK04832_BIT_CLKIN_SEL_TYPE GENMASK(2, 0) +#define LMK04832_VAL_CLKIN_SEL_TYPE_OUT 0x03 + +/* 0x14b - 0x152 Holdover */ + +/* 0x153 - 0x15f PLL1 Configuration */ + +/* 0x160 - 0x16e PLL2 Configuration */ +#define LMK04832_REG_PLL2_R_MSB 0x160 +#define LMK04832_BIT_PLL2_R_MSB GENMASK(3, 0) +#define LMK04832_REG_PLL2_R_LSB 0x161 +#define LMK04832_REG_PLL2_MISC 0x162 +#define LMK04832_BIT_PLL2_MISC_P GENMASK(7, 5) +#define LMK04832_BIT_PLL2_MISC_REF_2X_EN BIT(0) +#define LMK04832_REG_PLL2_N_CAL_0 0x163 +#define LMK04832_BIT_PLL2_N_CAL_0 GENMASK(1, 0) +#define LMK04832_REG_PLL2_N_CAL_1 0x164 +#define LMK04832_REG_PLL2_N_CAL_2 0x165 +#define LMK04832_REG_PLL2_N_0 0x166 +#define LMK04832_BIT_PLL2_N_0 GENMASK(1, 0) +#define LMK04832_REG_PLL2_N_1 0x167 +#define LMK04832_REG_PLL2_N_2 0x168 +#define LMK04832_REG_PLL2_DLD_CNT_MSB 0x16a +#define LMK04832_REG_PLL2_DLD_CNT_LSB 0x16b +#define LMK04832_REG_PLL2_LD 0x16e +#define LMK04832_BIT_PLL2_LD_MUX GENMASK(7, 3) +#define LMK04832_VAL_PLL2_LD_MUX_PLL2_DLD 0x02 +#define LMK04832_BIT_PLL2_LD_TYPE GENMASK(2, 0) +#define LMK04832_VAL_PLL2_LD_TYPE_OUT_PP 0x03 + +/* 0x16F - 0x555 Misc Registers */ +#define LMK04832_REG_PLL2_PD 0x173 +#define LMK04832_BIT_PLL2_PRE_PD BIT(6) +#define LMK04832_BIT_PLL2_PD BIT(5) +#define LMK04832_REG_PLL1R_RST 0x177 +#define LMK04832_REG_CLR_PLL_LOST 0x182 +#define LMK04832_REG_RB_PLL_LD 0x183 +#define LMK04832_REG_RB_CLK_DAC_VAL_MSB 0x184 +#define LMK04832_REG_RB_DAC_VAL_LSB 0x185 +#define LMK04832_REG_RB_HOLDOVER 0x188 +#define LMK04832_REG_SPI_LOCK 0x555 + +enum lmk04832_device_types { + LMK04832, +}; + +/** + * lmk04832_device_info - Holds static device information that is specific to + * the chip revision + * + * pid: Product Identifier + * maskrev: IC version identifier + * num_channels: Number of available output channels (clkout count) + * vco0_range: {min, max} of the VCO0 operating range (in MHz) + * vco1_range: {min, max} of the VCO1 operating range (in MHz) + */ +struct lmk04832_device_info { + u16 pid; + u8 maskrev; + size_t num_channels; + unsigned int vco0_range[2]; + unsigned int vco1_range[2]; +}; + +static const struct lmk04832_device_info lmk04832_device_info[] = { + [LMK04832] = { + .pid = 0x63d1, /* WARNING PROD_ID is inverted in the datasheet */ + .maskrev = 0x70, + .num_channels = 14, + .vco0_range = { 2440, 2580 }, + .vco1_range = { 2945, 3255 }, + }, +}; + +enum lmk04832_rdbk_type { + RDBK_CLKIN_SEL0, + RDBK_CLKIN_SEL1, + RDBK_RESET, +}; + +struct lmk_dclk { + struct lmk04832 *lmk; + struct clk_hw hw; + u8 id; +}; + +struct lmk_clkout { + struct lmk04832 *lmk; + struct clk_hw hw; + bool sysref; + u32 format; + u8 id; +}; + +/** + * struct lmk04832 - The LMK04832 device structure + * + * @dev: reference to a struct device, linked to the spi_device + * @regmap: struct regmap instance use to access the chip + * @sync_mode: operational mode for SYNC signal + * @sysref_mux: select SYSREF source + * @sysref_pulse_cnt: number of SYSREF pulses generated while not in continuous + * mode. + * @sysref_ddly: SYSREF digital delay value + * @oscin: PLL2 input clock + * @vco: reference to the internal VCO clock + * @sclk: reference to the internal sysref clock (SCLK) + * @vco_rate: user provided VCO rate + * @reset_gpio: reference to the reset GPIO + * @dclk: list of internal device clock references. + * Each pair of clkout clocks share a single device clock (DCLKX_Y) + * @clkout: list of output clock references + * @clk_data: holds clkout related data like clk_hw* and number of clocks + */ +struct lmk04832 { + struct device *dev; + struct regmap *regmap; + + unsigned int sync_mode; + unsigned int sysref_mux; + unsigned int sysref_pulse_cnt; + unsigned int sysref_ddly; + + struct clk *oscin; + struct clk_hw vco; + struct clk_hw sclk; + unsigned int vco_rate; + + struct gpio_desc *reset_gpio; + + struct lmk_dclk *dclk; + struct lmk_clkout *clkout; + struct clk_hw_onecell_data *clk_data; +}; + +static bool lmk04832_regmap_rd_regs(struct device *dev, unsigned int reg) +{ + switch (reg) { + case LMK04832_REG_RST3W ... LMK04832_REG_ID_MASKREV: + case LMK04832_REG_ID_VNDR_MSB: + case LMK04832_REG_ID_VNDR_LSB: + case LMK04832_REG_CLKOUT_CTRL0(0) ... LMK04832_REG_PLL2_DLD_CNT_LSB: + case LMK04832_REG_PLL2_LD: + case LMK04832_REG_PLL2_PD: + case LMK04832_REG_PLL1R_RST: + case LMK04832_REG_CLR_PLL_LOST ... LMK04832_REG_RB_DAC_VAL_LSB: + case LMK04832_REG_RB_HOLDOVER: + case LMK04832_REG_SPI_LOCK: + return true; + default: + return false; + }; +}; + +static bool lmk04832_regmap_wr_regs(struct device *dev, unsigned int reg) +{ + switch (reg) { + case LMK04832_REG_RST3W: + case LMK04832_REG_POWERDOWN: + return true; + case LMK04832_REG_ID_DEV_TYPE ... LMK04832_REG_ID_MASKREV: + case LMK04832_REG_ID_VNDR_MSB: + case LMK04832_REG_ID_VNDR_LSB: + return false; + case LMK04832_REG_CLKOUT_CTRL0(0) ... LMK04832_REG_PLL2_DLD_CNT_LSB: + case LMK04832_REG_PLL2_LD: + case LMK04832_REG_PLL2_PD: + case LMK04832_REG_PLL1R_RST: + case LMK04832_REG_CLR_PLL_LOST ... LMK04832_REG_RB_DAC_VAL_LSB: + case LMK04832_REG_RB_HOLDOVER: + case LMK04832_REG_SPI_LOCK: + return true; + default: + return false; + }; +}; + +static const struct regmap_config regmap_config = { + .name = "lmk04832", + .reg_bits = 16, + .val_bits = 8, + .use_single_read = 1, + .use_single_write = 1, + .read_flag_mask = 0x80, + .write_flag_mask = 0x00, + .readable_reg = lmk04832_regmap_rd_regs, + .writeable_reg = lmk04832_regmap_wr_regs, + .cache_type = REGCACHE_NONE, + .max_register = LMK04832_REG_SPI_LOCK, +}; + +static int lmk04832_vco_is_enabled(struct clk_hw *hw) +{ + struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco); + unsigned int tmp; + int ret; + + ret = regmap_read(lmk->regmap, LMK04832_REG_MAIN_PD, &tmp); + if (ret) + return ret; + + return !(FIELD_GET(LMK04832_BIT_OSCIN_PD, tmp) | + FIELD_GET(LMK04832_BIT_VCO_PD, tmp) | + FIELD_GET(LMK04832_BIT_VCO_LDO_PD, tmp)); +} + +static int lmk04832_vco_prepare(struct clk_hw *hw) +{ + struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco); + int ret; + + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_PD, + LMK04832_BIT_PLL2_PRE_PD | + LMK04832_BIT_PLL2_PD, + 0x00); + if (ret) + return ret; + + return regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD, + LMK04832_BIT_VCO_LDO_PD | + LMK04832_BIT_VCO_PD | + LMK04832_BIT_OSCIN_PD, 0x00); +} + +static void lmk04832_vco_unprepare(struct clk_hw *hw) +{ + struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco); + + regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_PD, + LMK04832_BIT_PLL2_PRE_PD | LMK04832_BIT_PLL2_PD, + 0xff); + + /* Don't set LMK04832_BIT_OSCIN_PD since other clocks depend on it */ + regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD, + LMK04832_BIT_VCO_LDO_PD | LMK04832_BIT_VCO_PD, 0xff); +} + +static unsigned long lmk04832_vco_recalc_rate(struct clk_hw *hw, + unsigned long prate) +{ + struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco); + unsigned int pll2_p[] = {8, 2, 2, 3, 4, 5, 6, 7}; + unsigned int pll2_n, p, pll2_r; + unsigned int pll2_misc; + unsigned long vco_rate; + u8 tmp[3]; + int ret; + + ret = regmap_read(lmk->regmap, LMK04832_REG_PLL2_MISC, &pll2_misc); + if (ret) + return ret; + + p = FIELD_GET(LMK04832_BIT_PLL2_MISC_P, pll2_misc); + + ret = regmap_bulk_read(lmk->regmap, LMK04832_REG_PLL2_N_0, &tmp, 3); + if (ret) + return ret; + + pll2_n = FIELD_PREP(0x030000, tmp[0]) | + FIELD_PREP(0x00ff00, tmp[1]) | + FIELD_PREP(0x0000ff, tmp[2]); + + ret = regmap_bulk_read(lmk->regmap, LMK04832_REG_PLL2_R_MSB, &tmp, 2); + if (ret) + return ret; + + pll2_r = FIELD_PREP(0x0f00, tmp[0]) | + FIELD_PREP(0x00ff, tmp[1]); + + vco_rate = (prate << FIELD_GET(LMK04832_BIT_PLL2_MISC_REF_2X_EN, + pll2_misc)) * pll2_n * pll2_p[p] / pll2_r; + + return vco_rate; +}; + +/** + * lmk04832_check_vco_ranges - Check requested VCO frequency against VCO ranges + * + * @lmk: Reference to the lmk device + * @rate: Desired output rate for the VCO + * + * The LMK04832 has 2 internal VCO, each with independent operating ranges. + * Use the device_info structure to determine which VCO to use based on rate. + * + * Returns VCO_MUX value or negative errno. + */ +static int lmk04832_check_vco_ranges(struct lmk04832 *lmk, unsigned long rate) +{ + struct spi_device *spi = to_spi_device(lmk->dev); + const struct lmk04832_device_info *info; + unsigned long mhz = rate / 1000000; + + info = &lmk04832_device_info[spi_get_device_id(spi)->driver_data]; + + if (mhz >= info->vco0_range[0] && mhz <= info->vco0_range[1]) + return LMK04832_VAL_VCO_MUX_VCO0; + + if (mhz >= info->vco1_range[0] && mhz <= info->vco1_range[1]) + return LMK04832_VAL_VCO_MUX_VCO1; + + dev_err(lmk->dev, "%lu Hz is out of VCO ranges\n", rate); + return -ERANGE; +} + +/** + * lmk04832_calc_pll2_params - Get PLL2 parameters used to set the VCO frequency + * + * @prate: parent rate to the PLL2, usually OSCin + * @rate: Desired output rate for the VCO + * @n: reference to PLL2_N + * @p: reference to PLL2_P + * @r: reference to PLL2_R + * + * This functions assumes LMK04832_BIT_PLL2_MISC_REF_2X_EN is set since it is + * recommended in the datasheet because a higher phase detector frequencies + * makes the design of wider loop bandwidth filters possible. + * + * the VCO rate can be calculated using the following expression: + * + * VCO = OSCin * 2 * PLL2_N * PLL2_P / PLL2_R + * + * Returns vco rate or negative errno. + */ +static long lmk04832_calc_pll2_params(unsigned long prate, unsigned long rate, + unsigned int *n, unsigned int *p, + unsigned int *r) +{ + unsigned int pll2_n, pll2_p, pll2_r; + unsigned long num, div; + + /* Set PLL2_P to a fixed value to simplify optimizations */ + pll2_p = 2; + + div = gcd(rate, prate); + + num = DIV_ROUND_CLOSEST(rate, div); + pll2_r = DIV_ROUND_CLOSEST(prate, div); + + if (num > 4) { + pll2_n = num >> 2; + } else { + pll2_r = pll2_r << 2; + pll2_n = num; + } + + if (pll2_n < 1 || pll2_n > 0x03ffff) + return -EINVAL; + if (pll2_r < 1 || pll2_r > 0xfff) + return -EINVAL; + + *n = pll2_n; + *p = pll2_p; + *r = pll2_r; + + return DIV_ROUND_CLOSEST(prate * 2 * pll2_p * pll2_n, pll2_r); +} + +static long lmk04832_vco_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco); + unsigned int n, p, r; + long vco_rate; + int ret; + + ret = lmk04832_check_vco_ranges(lmk, rate); + if (ret < 0) + return ret; + + vco_rate = lmk04832_calc_pll2_params(*prate, rate, &n, &p, &r); + if (vco_rate < 0) { + dev_err(lmk->dev, "PLL2 parameters out of range\n"); + return vco_rate; + } + + if (rate != vco_rate) + return -EINVAL; + + return vco_rate; +}; + +static int lmk04832_vco_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long prate) +{ + struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco); + unsigned int n, p, r; + long vco_rate; + int vco_mux; + int ret; + + vco_mux = lmk04832_check_vco_ranges(lmk, rate); + if (vco_mux < 0) + return vco_mux; + + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_VCO_OSCOUT, + LMK04832_BIT_VCO_MUX, + FIELD_PREP(LMK04832_BIT_VCO_MUX, vco_mux)); + if (ret) + return ret; + + vco_rate = lmk04832_calc_pll2_params(prate, rate, &n, &p, &r); + if (vco_rate < 0) { + dev_err(lmk->dev, "failed to determine PLL2 parameters\n"); + return vco_rate; + } + + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_R_MSB, + LMK04832_BIT_PLL2_R_MSB, + FIELD_GET(0x000700, r)); + if (ret) + return ret; + + ret = regmap_write(lmk->regmap, LMK04832_REG_PLL2_R_LSB, + FIELD_GET(0x0000ff, r)); + if (ret) + return ret; + + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_MISC, + LMK04832_BIT_PLL2_MISC_P, + FIELD_PREP(LMK04832_BIT_PLL2_MISC_P, p)); + if (ret) + return ret; + + /* + * PLL2_N registers must be programmed after other PLL2 dividers are + * programmed to ensure proper VCO frequency calibration + */ + ret = regmap_write(lmk->regmap, LMK04832_REG_PLL2_N_0, + FIELD_GET(0x030000, n)); + if (ret) + return ret; + ret = regmap_write(lmk->regmap, LMK04832_REG_PLL2_N_1, + FIELD_GET(0x00ff00, n)); + if (ret) + return ret; + + return regmap_write(lmk->regmap, LMK04832_REG_PLL2_N_2, + FIELD_GET(0x0000ff, n)); +}; + +static const struct clk_ops lmk04832_vco_ops = { + .is_enabled = lmk04832_vco_is_enabled, + .prepare = lmk04832_vco_prepare, + .unprepare = lmk04832_vco_unprepare, + .recalc_rate = lmk04832_vco_recalc_rate, + .round_rate = lmk04832_vco_round_rate, + .set_rate = lmk04832_vco_set_rate, +}; + +/* + * lmk04832_register_vco - Initialize the internal VCO and clock distribution + * path in PLL2 single loop mode. + */ +static int lmk04832_register_vco(struct lmk04832 *lmk) +{ + const char *parent_names[1]; + struct clk_init_data init; + int ret; + + init.name = "lmk-vco"; + parent_names[0] = __clk_get_name(lmk->oscin); + init.parent_names = parent_names; + + init.ops = &lmk04832_vco_ops; + init.num_parents = 1; + + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_VCO_OSCOUT, + LMK04832_BIT_VCO_MUX, + FIELD_PREP(LMK04832_BIT_VCO_MUX, + LMK04832_VAL_VCO_MUX_VCO1)); + if (ret) + return ret; + + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_FB_CTRL, + LMK04832_BIT_PLL2_RCLK_MUX | + LMK04832_BIT_PLL2_NCLK_MUX, + FIELD_PREP(LMK04832_BIT_PLL2_RCLK_MUX, + LMK04832_VAL_PLL2_RCLK_MUX_OSCIN)| + FIELD_PREP(LMK04832_BIT_PLL2_NCLK_MUX, + LMK04832_VAL_PLL2_NCLK_MUX_PLL2_P)); + if (ret) + return ret; + + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_MISC, + LMK04832_BIT_PLL2_MISC_REF_2X_EN, + LMK04832_BIT_PLL2_MISC_REF_2X_EN); + if (ret) + return ret; + + ret = regmap_write(lmk->regmap, LMK04832_REG_PLL2_LD, + FIELD_PREP(LMK04832_BIT_PLL2_LD_MUX, + LMK04832_VAL_PLL2_LD_MUX_PLL2_DLD) | + FIELD_PREP(LMK04832_BIT_PLL2_LD_TYPE, + LMK04832_VAL_PLL2_LD_TYPE_OUT_PP)); + if (ret) + return ret; + + lmk->vco.init = &init; + return devm_clk_hw_register(lmk->dev, &lmk->vco); +} + +static int lmk04832_clkout_set_ddly(struct lmk04832 *lmk, int id) +{ + int dclk_div_adj[] = {0, 0, -2, -2, 0, 3, -1, 0}; + unsigned int sclkx_y_ddly = 10; + unsigned int dclkx_y_ddly; + unsigned int dclkx_y_div; + unsigned int sysref_ddly; + unsigned int dclkx_y_hs; + unsigned int lsb, msb; + int ret; + + ret = regmap_update_bits(lmk->regmap, + LMK04832_REG_CLKOUT_CTRL2(id), + LMK04832_BIT_DCLKX_Y_DDLY_PD, + FIELD_PREP(LMK04832_BIT_DCLKX_Y_DDLY_PD, 0)); + if (ret) + return ret; + + ret = regmap_read(lmk->regmap, LMK04832_REG_SYSREF_DDLY_LSB, &lsb); + if (ret) + return ret; + + ret = regmap_read(lmk->regmap, LMK04832_REG_SYSREF_DDLY_MSB, &msb); + if (ret) + return ret; + + sysref_ddly = FIELD_GET(LMK04832_BIT_SYSREF_DDLY_MSB, msb) << 8 | lsb; + + ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL0(id), &lsb); + if (ret) + return ret; + + ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL2(id), &msb); + if (ret) + return ret; + + dclkx_y_div = FIELD_GET(LMK04832_BIT_DCLK_DIV_MSB, msb) << 8 | lsb; + + ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL3(id), &lsb); + if (ret) + return ret; + + dclkx_y_hs = FIELD_GET(LMK04832_BIT_DCLKX_Y_HS, lsb); + + dclkx_y_ddly = sysref_ddly + 1 - + dclk_div_adj[dclkx_y_div < 6 ? dclkx_y_div : 7] - + dclkx_y_hs + sclkx_y_ddly; + + if (dclkx_y_ddly < 7 || dclkx_y_ddly > 0x3fff) { + dev_err(lmk->dev, "DCLKX_Y_DDLY out of range (%d)\n", + dclkx_y_ddly); + return -EINVAL; + } + + ret = regmap_write(lmk->regmap, + LMK04832_REG_SCLKX_Y_DDLY(id), + FIELD_GET(LMK04832_BIT_SCLKX_Y_DDLY, sclkx_y_ddly)); + if (ret) + return ret; + + ret = regmap_write(lmk->regmap, LMK04832_REG_CLKOUT_CTRL1(id), + FIELD_GET(0x00ff, dclkx_y_ddly)); + if (ret) + return ret; + + dev_dbg(lmk->dev, "clkout%02u: sysref_ddly=%u, dclkx_y_ddly=%u, " + "dclk_div_adj=%+d, dclkx_y_hs=%u, sclkx_y_ddly=%u\n", + id, sysref_ddly, dclkx_y_ddly, + dclk_div_adj[dclkx_y_div < 6 ? dclkx_y_div : 7], + dclkx_y_hs, sclkx_y_ddly); + + return regmap_update_bits(lmk->regmap, LMK04832_REG_CLKOUT_CTRL2(id), + LMK04832_BIT_DCLKX_Y_DDLY_MSB, + FIELD_GET(0x0300, dclkx_y_ddly)); +} + +/** lmk04832_sclk_sync - Establish deterministic phase relationship between sclk + * and dclk + * + * @lmk: Reference to the lmk device + * + * The synchronization sequence: + * - in the datasheet https://www.ti.com/lit/ds/symlink/lmk04832.pdf, p.31 + * (8.3.3.1 How to enable SYSREF) + * - Ti forum: https://e2e.ti.com/support/clock-and-timing/f/48/t/970972 + * + * Returns 0 or negative errno. + */ +static int lmk04832_sclk_sync_sequence(struct lmk04832 *lmk) +{ + int ret; + int i; + + /* 1. (optional) mute all sysref_outputs during synchronization */ + /* 2. Enable and write device clock digital delay to applicable clocks */ + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD, + LMK04832_BIT_SYSREF_DDLY_PD, + FIELD_PREP(LMK04832_BIT_SYSREF_DDLY_PD, 0)); + if (ret) + return ret; + + for (i = 0; i < lmk->clk_data->num; i += 2) { + ret = lmk04832_clkout_set_ddly(lmk, i); + if (ret) + return ret; + } + + /* + * 3. Configure SYNC_MODE to SYNC_PIN and SYSREF_MUX to Normal SYNC, + * and clear SYSREF_REQ_EN (see 6.) + */ + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYSREF_OUT, + LMK04832_BIT_SYSREF_REQ_EN | + LMK04832_BIT_SYSREF_MUX, + FIELD_PREP(LMK04832_BIT_SYSREF_REQ_EN, 0) | + FIELD_PREP(LMK04832_BIT_SYSREF_MUX, + LMK04832_VAL_SYSREF_MUX_NORMAL_SYNC)); + if (ret) + return ret; + + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC, + LMK04832_BIT_SYNC_MODE, + FIELD_PREP(LMK04832_BIT_SYNC_MODE, + LMK04832_VAL_SYNC_MODE_ON)); + if (ret) + return ret; + + /* 4. Clear SYNXC_DISx or applicable clocks and clear SYNC_DISSYSREF */ + ret = regmap_write(lmk->regmap, LMK04832_REG_SYNC_DIS, 0x00); + if (ret) + return ret; + + /* + * 5. If SCLKX_Y_DDLY != 0, Set SYSREF_CLR=1 for at least 15 clock + * distribution path cycles (VCO cycles), then back to 0. In + * PLL2-only use case, this will be complete in less than one SPI + * transaction. If SYSREF local digital delay is not used, this step + * can be skipped. + */ + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC, + LMK04832_BIT_SYNC_CLR, + FIELD_PREP(LMK04832_BIT_SYNC_CLR, 0x01)); + if (ret) + return ret; + + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC, + LMK04832_BIT_SYNC_CLR, + FIELD_PREP(LMK04832_BIT_SYNC_CLR, 0x00)); + if (ret) + return ret; + + /* + * 6. Toggle SYNC_POL state between inverted and not inverted. + * If you use an external signal on the SYNC pin instead of toggling + * SYNC_POL, make sure that SYSREF_REQ_EN=0 so that the SYSREF_MUX + * does not shift into continuous SYSREF mode. + */ + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC, + LMK04832_BIT_SYNC_POL, + FIELD_PREP(LMK04832_BIT_SYNC_POL, 0x01)); + if (ret) + return ret; + + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC, + LMK04832_BIT_SYNC_POL, + FIELD_PREP(LMK04832_BIT_SYNC_POL, 0x00)); + if (ret) + return ret; + + /* 7. Set all SYNC_DISx=1, including SYNC_DISSYSREF */ + ret = regmap_write(lmk->regmap, LMK04832_REG_SYNC_DIS, 0xff); + if (ret) + return ret; + + /* 8. Restore state of SYNC_MODE and SYSREF_MUX to desired values */ + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYSREF_OUT, + LMK04832_BIT_SYSREF_MUX, + FIELD_PREP(LMK04832_BIT_SYSREF_MUX, + lmk->sysref_mux)); + if (ret) + return ret; + + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC, + LMK04832_BIT_SYNC_MODE, + FIELD_PREP(LMK04832_BIT_SYNC_MODE, + lmk->sync_mode)); + if (ret) + return ret; + + /* + * 9. (optional) if SCLKx_y_DIS_MODE was used to mute SYSREF outputs + * during the SYNC event, restore SCLKx_y_DIS_MODE=0 for active state, + * or set SYSREF_GBL_PD=0 if SCLKx_y_DIS_MODE is set to a conditional + * option. + */ + + /* + * 10. (optional) To reduce power consumption, after the synchronization + * event is complete, DCLKx_y_DDLY_PD=1 and SYSREF_DDLY_PD=1 disable the + * digital delay counters (which are only used immediately after the + * SYNC pulse to delay the output by some number of VCO counts). + */ + + return ret; +} + +static int lmk04832_sclk_is_enabled(struct clk_hw *hw) +{ + struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk); + unsigned int tmp; + int ret; + + ret = regmap_read(lmk->regmap, LMK04832_REG_MAIN_PD, &tmp); + if (ret) + return ret; + + return FIELD_GET(LMK04832_BIT_SYSREF_PD, tmp); +} + +static int lmk04832_sclk_prepare(struct clk_hw *hw) +{ + struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk); + + return regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD, + LMK04832_BIT_SYSREF_PD, 0x00); +} + +static void lmk04832_sclk_unprepare(struct clk_hw *hw) +{ + struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk); + + regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD, + LMK04832_BIT_SYSREF_PD, LMK04832_BIT_SYSREF_PD); +} + +static unsigned long lmk04832_sclk_recalc_rate(struct clk_hw *hw, + unsigned long prate) +{ + struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk); + unsigned int sysref_div; + u8 tmp[2]; + int ret; + + ret = regmap_bulk_read(lmk->regmap, LMK04832_REG_SYSREF_DIV_MSB, &tmp, 2); + if (ret) + return ret; + + sysref_div = FIELD_GET(LMK04832_BIT_SYSREF_DIV_MSB, tmp[0]) << 8 | + tmp[1]; + + return DIV_ROUND_CLOSEST(prate, sysref_div); +} + +static long lmk04832_sclk_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk); + unsigned long sclk_rate; + unsigned int sysref_div; + + sysref_div = DIV_ROUND_CLOSEST(*prate, rate); + sclk_rate = DIV_ROUND_CLOSEST(*prate, sysref_div); + + if (sysref_div < 0x07 || sysref_div > 0x1fff) { + dev_err(lmk->dev, "SYSREF divider out of range\n"); + return -EINVAL; + } + + if (rate != sclk_rate) + return -EINVAL; + + return sclk_rate; +} + +static int lmk04832_sclk_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long prate) +{ + struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk); + unsigned int sysref_div; + int ret; + + sysref_div = DIV_ROUND_CLOSEST(prate, rate); + + if (sysref_div < 0x07 || sysref_div > 0x1fff) { + dev_err(lmk->dev, "SYSREF divider out of range\n"); + return -EINVAL; + } + + ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_DIV_MSB, + FIELD_GET(0x1f00, sysref_div)); + if (ret) + return ret; + + ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_DIV_LSB, + FIELD_GET(0x00ff, sysref_div)); + if (ret) + return ret; + + ret = lmk04832_sclk_sync_sequence(lmk); + if (ret) + dev_err(lmk->dev, "SYNC sequence failed\n"); + + return ret; +} + +static const struct clk_ops lmk04832_sclk_ops = { + .is_enabled = lmk04832_sclk_is_enabled, + .prepare = lmk04832_sclk_prepare, + .unprepare = lmk04832_sclk_unprepare, + .recalc_rate = lmk04832_sclk_recalc_rate, + .round_rate = lmk04832_sclk_round_rate, + .set_rate = lmk04832_sclk_set_rate, +}; + +static int lmk04832_register_sclk(struct lmk04832 *lmk) +{ + const char *parent_names[1]; + struct clk_init_data init; + int ret; + + init.name = "lmk-sclk"; + parent_names[0] = clk_hw_get_name(&lmk->vco); + init.parent_names = parent_names; + + init.ops = &lmk04832_sclk_ops; + init.flags = CLK_SET_RATE_PARENT; + init.num_parents = 1; + + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYSREF_OUT, + LMK04832_BIT_SYSREF_MUX, + FIELD_PREP(LMK04832_BIT_SYSREF_MUX, + lmk->sysref_mux)); + if (ret) + return ret; + + ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_DDLY_LSB, + FIELD_GET(0x00ff, lmk->sysref_ddly)); + if (ret) + return ret; + + ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_DDLY_MSB, + FIELD_GET(0x1f00, lmk->sysref_ddly)); + if (ret) + return ret; + + ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_PULSE_CNT, + ilog2(lmk->sysref_pulse_cnt)); + if (ret) + return ret; + + ret = regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD, + LMK04832_BIT_SYSREF_DDLY_PD | + LMK04832_BIT_SYSREF_PLSR_PD, + FIELD_PREP(LMK04832_BIT_SYSREF_DDLY_PD, 0) | + FIELD_PREP(LMK04832_BIT_SYSREF_PLSR_PD, 0)); + if (ret) + return ret; + + ret = regmap_write(lmk->regmap, LMK04832_REG_SYNC, + FIELD_PREP(LMK04832_BIT_SYNC_POL, 0) | + FIELD_PREP(LMK04832_BIT_SYNC_EN, 1) | + FIELD_PREP(LMK04832_BIT_SYNC_MODE, lmk->sync_mode)); + if (ret) + return ret; + + ret = regmap_write(lmk->regmap, LMK04832_REG_SYNC_DIS, 0xff); + if (ret) + return ret; + + lmk->sclk.init = &init; + return devm_clk_hw_register(lmk->dev, &lmk->sclk); +} + +static int lmk04832_dclk_is_enabled(struct clk_hw *hw) +{ + struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw); + struct lmk04832 *lmk = dclk->lmk; + unsigned int tmp; + int ret; + + ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL3(dclk->id), + &tmp); + if (ret) + return ret; + + return !FIELD_GET(LMK04832_BIT_DCLKX_Y_PD, tmp); +} + +static int lmk04832_dclk_prepare(struct clk_hw *hw) +{ + struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw); + struct lmk04832 *lmk = dclk->lmk; + + return regmap_update_bits(lmk->regmap, + LMK04832_REG_CLKOUT_CTRL3(dclk->id), + LMK04832_BIT_DCLKX_Y_PD, 0x00); +} + +static void lmk04832_dclk_unprepare(struct clk_hw *hw) +{ + struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw); + struct lmk04832 *lmk = dclk->lmk; + + regmap_update_bits(lmk->regmap, + LMK04832_REG_CLKOUT_CTRL3(dclk->id), + LMK04832_BIT_DCLKX_Y_PD, 0xff); +} + +static unsigned long lmk04832_dclk_recalc_rate(struct clk_hw *hw, + unsigned long prate) +{ + struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw); + struct lmk04832 *lmk = dclk->lmk; + unsigned int dclk_div; + unsigned int lsb, msb; + unsigned long rate; + int ret; + + ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL0(dclk->id), + &lsb); + if (ret) + return ret; + + ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL2(dclk->id), + &msb); + if (ret) + return ret; + + dclk_div = FIELD_GET(LMK04832_BIT_DCLK_DIV_MSB, msb) << 8 | lsb; + rate = DIV_ROUND_CLOSEST(prate, dclk_div); + + return rate; +}; + +static long lmk04832_dclk_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw); + struct lmk04832 *lmk = dclk->lmk; + unsigned long dclk_rate; + unsigned int dclk_div; + + dclk_div = DIV_ROUND_CLOSEST(*prate, rate); + dclk_rate = DIV_ROUND_CLOSEST(*prate, dclk_div); + + if (dclk_div < 1 || dclk_div > 0x3ff) { + dev_err(lmk->dev, "%s_div out of range\n", clk_hw_get_name(hw)); + return -EINVAL; + } + + if (rate != dclk_rate) + return -EINVAL; + + return dclk_rate; +}; + +static int lmk04832_dclk_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long prate) +{ + struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw); + struct lmk04832 *lmk = dclk->lmk; + unsigned int dclk_div; + int ret; + + dclk_div = DIV_ROUND_CLOSEST(prate, rate); + + if (dclk_div > 0x3ff) { + dev_err(lmk->dev, "%s_div out of range\n", clk_hw_get_name(hw)); + return -EINVAL; + } + + /* Enable Duty Cycle Correction */ + if (dclk_div == 1) { + ret = regmap_update_bits(lmk->regmap, + LMK04832_REG_CLKOUT_CTRL3(dclk->id), + LMK04832_BIT_DCLKX_Y_DCC, + FIELD_PREP(LMK04832_BIT_DCLKX_Y_DCC, 1)); + if (ret) + return ret; + } + + /* + * While using Divide-by-2 or Divide-by-3 for DCLK_X_Y_DIV, SYNC + * procedure requires to first program Divide-by-4 and then back to + * Divide-by-2 or Divide-by-3 before doing SYNC. + */ + if (dclk_div == 2 || dclk_div == 3) { + ret = regmap_update_bits(lmk->regmap, + LMK04832_REG_CLKOUT_CTRL2(dclk->id), + LMK04832_BIT_DCLK_DIV_MSB, 0x00); + if (ret) + return ret; + + ret = regmap_write(lmk->regmap, + LMK04832_REG_CLKOUT_CTRL0(dclk->id), 0x04); + if (ret) + return ret; + } + + ret = regmap_write(lmk->regmap, LMK04832_REG_CLKOUT_CTRL0(dclk->id), + FIELD_GET(0x0ff, dclk_div)); + if (ret) + return ret; + + ret = regmap_update_bits(lmk->regmap, + LMK04832_REG_CLKOUT_CTRL2(dclk->id), + LMK04832_BIT_DCLK_DIV_MSB, + FIELD_GET(0x300, dclk_div)); + if (ret) + return ret; + + ret = lmk04832_sclk_sync_sequence(lmk); + if (ret) + dev_err(lmk->dev, "SYNC sequence failed\n"); + + return ret; +}; + +static const struct clk_ops lmk04832_dclk_ops = { + .is_enabled = lmk04832_dclk_is_enabled, + .prepare = lmk04832_dclk_prepare, + .unprepare = lmk04832_dclk_unprepare, + .recalc_rate = lmk04832_dclk_recalc_rate, + .round_rate = lmk04832_dclk_round_rate, + .set_rate = lmk04832_dclk_set_rate, +}; + +static int lmk04832_clkout_is_enabled(struct clk_hw *hw) +{ + struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw); + struct lmk04832 *lmk = clkout->lmk; + unsigned int clkoutx_y_pd; + unsigned int sclkx_y_pd; + unsigned int tmp; + u32 enabled; + int ret; + u8 fmt; + + ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL2(clkout->id), + &clkoutx_y_pd); + if (ret) + return ret; + + enabled = !FIELD_GET(LMK04832_BIT_CLKOUTX_Y_PD, clkoutx_y_pd); + + ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_SRC_MUX(clkout->id), + &tmp); + if (ret) + return ret; + + if (FIELD_GET(LMK04832_BIT_CLKOUT_SRC_MUX, tmp)) { + ret = regmap_read(lmk->regmap, + LMK04832_REG_CLKOUT_CTRL4(clkout->id), + &sclkx_y_pd); + if (ret) + return ret; + + enabled = enabled && !FIELD_GET(LMK04832_BIT_SCLK_PD, sclkx_y_pd); + } + + ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_FMT(clkout->id), + &tmp); + if (ret) + return ret; + + if (clkout->id % 2) + fmt = FIELD_GET(0xf0, tmp); + else + fmt = FIELD_GET(0x0f, tmp); + + return enabled && !fmt; +} + +static int lmk04832_clkout_prepare(struct clk_hw *hw) +{ + struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw); + struct lmk04832 *lmk = clkout->lmk; + unsigned int tmp; + int ret; + + if (clkout->format == LMK04832_VAL_CLKOUT_FMT_POWERDOWN) + dev_err(lmk->dev, "prepared %s but format is powerdown\n", + clk_hw_get_name(hw)); + + ret = regmap_update_bits(lmk->regmap, + LMK04832_REG_CLKOUT_CTRL2(clkout->id), + LMK04832_BIT_CLKOUTX_Y_PD, 0x00); + if (ret) + return ret; + + ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_SRC_MUX(clkout->id), + &tmp); + if (ret) + return ret; + + if (FIELD_GET(LMK04832_BIT_CLKOUT_SRC_MUX, tmp)) { + ret = regmap_update_bits(lmk->regmap, + LMK04832_REG_CLKOUT_CTRL4(clkout->id), + LMK04832_BIT_SCLK_PD, 0x00); + if (ret) + return ret; + } + + return regmap_update_bits(lmk->regmap, + LMK04832_REG_CLKOUT_FMT(clkout->id), + LMK04832_BIT_CLKOUT_FMT(clkout->id), + clkout->format << 4 * (clkout->id % 2)); +} + +static void lmk04832_clkout_unprepare(struct clk_hw *hw) +{ + struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw); + struct lmk04832 *lmk = clkout->lmk; + + regmap_update_bits(lmk->regmap, LMK04832_REG_CLKOUT_FMT(clkout->id), + LMK04832_BIT_CLKOUT_FMT(clkout->id), + 0x00); +} + +static int lmk04832_clkout_set_parent(struct clk_hw *hw, uint8_t index) +{ + struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw); + struct lmk04832 *lmk = clkout->lmk; + + return regmap_update_bits(lmk->regmap, + LMK04832_REG_CLKOUT_SRC_MUX(clkout->id), + LMK04832_BIT_CLKOUT_SRC_MUX, + FIELD_PREP(LMK04832_BIT_CLKOUT_SRC_MUX, + index)); +} + +static uint8_t lmk04832_clkout_get_parent(struct clk_hw *hw) +{ + struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw); + struct lmk04832 *lmk = clkout->lmk; + unsigned int tmp; + int ret; + + ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_SRC_MUX(clkout->id), + &tmp); + if (ret) + return ret; + + return FIELD_GET(LMK04832_BIT_CLKOUT_SRC_MUX, tmp); +} + +static const struct clk_ops lmk04832_clkout_ops = { + .is_enabled = lmk04832_clkout_is_enabled, + .prepare = lmk04832_clkout_prepare, + .unprepare = lmk04832_clkout_unprepare, + .set_parent = lmk04832_clkout_set_parent, + .get_parent = lmk04832_clkout_get_parent, +}; + +static int lmk04832_register_clkout(struct lmk04832 *lmk, const int num) +{ + char name[] = "lmk-clkoutXX"; + char dclk_name[] = "lmk-dclkXX_YY"; + const char *parent_names[2]; + struct clk_init_data init; + int dclk_num = num / 2; + int ret; + + if (num % 2 == 0) { + sprintf(dclk_name, "lmk-dclk%02d_%02d", num, num + 1); + init.name = dclk_name; + parent_names[0] = clk_hw_get_name(&lmk->vco); + init.ops = &lmk04832_dclk_ops; + init.flags = CLK_SET_RATE_PARENT; + init.num_parents = 1; + + lmk->dclk[dclk_num].id = num; + lmk->dclk[dclk_num].lmk = lmk; + lmk->dclk[dclk_num].hw.init = &init; + + ret = devm_clk_hw_register(lmk->dev, &lmk->dclk[dclk_num].hw); + if (ret) + return ret; + } else { + sprintf(dclk_name, "lmk-dclk%02d_%02d", num - 1, num); + } + + if (of_property_read_string_index(lmk->dev->of_node, + "clock-output-names", + num, &init.name)) { + sprintf(name, "lmk-clkout%02d", num); + init.name = name; + } + + parent_names[0] = dclk_name; + parent_names[1] = clk_hw_get_name(&lmk->sclk); + init.parent_names = parent_names; + init.ops = &lmk04832_clkout_ops; + init.flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT; + init.num_parents = ARRAY_SIZE(parent_names); + + lmk->clkout[num].id = num; + lmk->clkout[num].lmk = lmk; + lmk->clkout[num].hw.init = &init; + lmk->clk_data->hws[num] = &lmk->clkout[num].hw; + + /* Set initial parent */ + regmap_update_bits(lmk->regmap, + LMK04832_REG_CLKOUT_SRC_MUX(num), + LMK04832_BIT_CLKOUT_SRC_MUX, + FIELD_PREP(LMK04832_BIT_CLKOUT_SRC_MUX, + lmk->clkout[num].sysref)); + + return devm_clk_hw_register(lmk->dev, &lmk->clkout[num].hw); +} + +static int lmk04832_set_spi_rdbk(const struct lmk04832 *lmk, const int rdbk_pin) +{ + int reg; + int ret; + + dev_info(lmk->dev, "setting up 4-wire mode\n"); + ret = regmap_write(lmk->regmap, LMK04832_REG_RST3W, + LMK04832_BIT_SPI_3WIRE_DIS); + if (ret) + return ret; + + switch (rdbk_pin) { + case RDBK_CLKIN_SEL0: + reg = LMK04832_REG_CLKIN_SEL0; + break; + case RDBK_CLKIN_SEL1: + reg = LMK04832_REG_CLKIN_SEL1; + break; + case RDBK_RESET: + reg = LMK04832_REG_CLKIN_RST; + break; + default: + return -EINVAL; + } + + return regmap_write(lmk->regmap, reg, + FIELD_PREP(LMK04832_BIT_CLKIN_SEL_MUX, + LMK04832_VAL_CLKIN_SEL_MUX_SPI_RDBK) | + FIELD_PREP(LMK04832_BIT_CLKIN_SEL_TYPE, + LMK04832_VAL_CLKIN_SEL_TYPE_OUT)); +} + +static int lmk04832_probe(struct spi_device *spi) +{ + const struct lmk04832_device_info *info; + int rdbk_pin = RDBK_CLKIN_SEL1; + struct device_node *child; + struct lmk04832 *lmk; + u8 tmp[3]; + int ret; + int i; + + info = &lmk04832_device_info[spi_get_device_id(spi)->driver_data]; + + lmk = devm_kzalloc(&spi->dev, sizeof(struct lmk04832), GFP_KERNEL); + if (!lmk) + return -ENOMEM; + + lmk->dev = &spi->dev; + + lmk->oscin = devm_clk_get(lmk->dev, "oscin"); + if (IS_ERR(lmk->oscin)) { + dev_err(lmk->dev, "failed to get oscin clock\n"); + return PTR_ERR(lmk->oscin); + } + + ret = clk_prepare_enable(lmk->oscin); + if (ret) + return ret; + + lmk->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", + GPIOD_OUT_LOW); + + lmk->dclk = devm_kcalloc(lmk->dev, info->num_channels >> 1, + sizeof(struct lmk_dclk), GFP_KERNEL); + if (!lmk->dclk) { + ret = -ENOMEM; + goto err_disable_oscin; + } + + lmk->clkout = devm_kcalloc(lmk->dev, info->num_channels, + sizeof(*lmk->clkout), GFP_KERNEL); + if (!lmk->clkout) { + ret = -ENOMEM; + goto err_disable_oscin; + } + + lmk->clk_data = devm_kzalloc(lmk->dev, struct_size(lmk->clk_data, hws, + info->num_channels), + GFP_KERNEL); + if (!lmk->clk_data) { + ret = -ENOMEM; + goto err_disable_oscin; + } + + device_property_read_u32(lmk->dev, "ti,vco-hz", &lmk->vco_rate); + + lmk->sysref_ddly = 8; + device_property_read_u32(lmk->dev, "ti,sysref-ddly", &lmk->sysref_ddly); + + lmk->sysref_mux = LMK04832_VAL_SYSREF_MUX_CONTINUOUS; + device_property_read_u32(lmk->dev, "ti,sysref-mux", + &lmk->sysref_mux); + + lmk->sync_mode = LMK04832_VAL_SYNC_MODE_OFF; + device_property_read_u32(lmk->dev, "ti,sync-mode", + &lmk->sync_mode); + + lmk->sysref_pulse_cnt = 4; + device_property_read_u32(lmk->dev, "ti,sysref-pulse-count", + &lmk->sysref_pulse_cnt); + + for_each_child_of_node(lmk->dev->of_node, child) { + int reg; + + ret = of_property_read_u32(child, "reg", ®); + if (ret) { + dev_err(lmk->dev, "missing reg property in child: %s\n", + child->full_name); + of_node_put(child); + goto err_disable_oscin; + } + + of_property_read_u32(child, "ti,clkout-fmt", + &lmk->clkout[reg].format); + + if (lmk->clkout[reg].format >= 0x0a && reg % 2 == 0 + && reg != 8 && reg != 10) + dev_err(lmk->dev, "invalid format for clkout%02d\n", + reg); + + lmk->clkout[reg].sysref = + of_property_read_bool(child, "ti,clkout-sysref"); + } + + lmk->regmap = devm_regmap_init_spi(spi, ®map_config); + if (IS_ERR(lmk->regmap)) { + dev_err(lmk->dev, "%s: regmap allocation failed: %ld\n", + + __func__, PTR_ERR(lmk->regmap)); + ret = PTR_ERR(lmk->regmap); + goto err_disable_oscin; + } + + regmap_write(lmk->regmap, LMK04832_REG_RST3W, LMK04832_BIT_RESET); + + if (!(spi->mode & SPI_3WIRE)) { + device_property_read_u32(lmk->dev, "ti,spi-4wire-rdbk", + &rdbk_pin); + ret = lmk04832_set_spi_rdbk(lmk, rdbk_pin); + if (ret) + goto err_disable_oscin; + } + + regmap_bulk_read(lmk->regmap, LMK04832_REG_ID_PROD_MSB, &tmp, 3); + if ((tmp[0] << 8 | tmp[1]) != info->pid || tmp[2] != info->maskrev) { + dev_err(lmk->dev, "unsupported device type: pid 0x%04x, maskrev 0x%02x\n", + tmp[0] << 8 | tmp[1], tmp[2]); + ret = -EINVAL; + goto err_disable_oscin; + } + + ret = lmk04832_register_vco(lmk); + if (ret) { + dev_err(lmk->dev, "failed to init device clock path\n"); + goto err_disable_oscin; + } + + if (lmk->vco_rate) { + dev_info(lmk->dev, "setting VCO rate to %u Hz\n", lmk->vco_rate); + ret = clk_set_rate(lmk->vco.clk, lmk->vco_rate); + if (ret) { + dev_err(lmk->dev, "failed to set VCO rate\n"); + goto err_disable_vco; + } + } + + ret = lmk04832_register_sclk(lmk); + if (ret) { + dev_err(lmk->dev, "failed to init SYNC/SYSREF clock path\n"); + goto err_disable_vco; + } + + for (i = 0; i < info->num_channels; i++) { + ret = lmk04832_register_clkout(lmk, i); + if (ret) { + dev_err(lmk->dev, "failed to register clk %d\n", i); + goto err_disable_vco; + } + } + + lmk->clk_data->num = info->num_channels; + ret = of_clk_add_hw_provider(lmk->dev->of_node, of_clk_hw_onecell_get, + lmk->clk_data); + if (ret) { + dev_err(lmk->dev, "failed to add provider (%d)\n", ret); + goto err_disable_vco; + } + + spi_set_drvdata(spi, lmk); + + return 0; + +err_disable_vco: + clk_disable_unprepare(lmk->vco.clk); + +err_disable_oscin: + clk_disable_unprepare(lmk->oscin); + + return ret; +} + +static void lmk04832_remove(struct spi_device *spi) +{ + struct lmk04832 *lmk = spi_get_drvdata(spi); + + clk_disable_unprepare(lmk->oscin); + of_clk_del_provider(spi->dev.of_node); +} +static const struct spi_device_id lmk04832_id[] = { + { "lmk04832", LMK04832 }, + {} +}; +MODULE_DEVICE_TABLE(spi, lmk04832_id); + +static const struct of_device_id lmk04832_of_id[] = { + { .compatible = "ti,lmk04832" }, + {} +}; +MODULE_DEVICE_TABLE(of, lmk04832_of_id); + +static struct spi_driver lmk04832_driver = { + .driver = { + .name = "lmk04832", + .of_match_table = lmk04832_of_id, + }, + .probe = lmk04832_probe, + .remove = lmk04832_remove, + .id_table = lmk04832_id, +}; +module_spi_driver(lmk04832_driver); + +MODULE_AUTHOR("Liam Beguin <lvb@xiphos.com>"); +MODULE_DESCRIPTION("Texas Instruments LMK04832"); +MODULE_LICENSE("GPL v2"); |