Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 753 insertions, 0 deletions

diff --git a/drivers/clk/clk-vt8500.c b/drivers/clk/clk-vt8500.c
new file mode 100644
index 000000000..4161a6f25
--- /dev/null
+++ b/drivers/clk/clk-vt8500.c
@@ -0,0 +1,753 @@
+/*
+ * Clock implementation for VIA/Wondermedia SoC's
+ * Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <linux/bitops.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+
+#define LEGACY_PMC_BASE		0xD8130000
+
+/* All clocks share the same lock as none can be changed concurrently */
+static DEFINE_SPINLOCK(_lock);
+
+struct clk_device {
+	struct clk_hw	hw;
+	void __iomem	*div_reg;
+	unsigned int	div_mask;
+	void __iomem	*en_reg;
+	int		en_bit;
+	spinlock_t	*lock;
+};
+
+/*
+ * Add new PLL_TYPE_x definitions here as required. Use the first known model
+ * to support the new type as the name.
+ * Add case statements to vtwm_pll_recalc_rate(), vtwm_pll_round_round() and
+ * vtwm_pll_set_rate() to handle the new PLL_TYPE_x
+ */
+
+#define PLL_TYPE_VT8500		0
+#define PLL_TYPE_WM8650		1
+#define PLL_TYPE_WM8750		2
+#define PLL_TYPE_WM8850		3
+
+struct clk_pll {
+	struct clk_hw	hw;
+	void __iomem	*reg;
+	spinlock_t	*lock;
+	int		type;
+};
+
+static void __iomem *pmc_base;
+
+static __init void vtwm_set_pmc_base(void)
+{
+	struct device_node *np =
+		of_find_compatible_node(NULL, NULL, "via,vt8500-pmc");
+
+	if (np)
+		pmc_base = of_iomap(np, 0);
+	else
+		pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000);
+	of_node_put(np);
+
+	if (!pmc_base)
+		pr_err("%s:of_iomap(pmc) failed\n", __func__);
+}
+
+#define to_clk_device(_hw) container_of(_hw, struct clk_device, hw)
+
+#define VT8500_PMC_BUSY_MASK		0x18
+
+static void vt8500_pmc_wait_busy(void)
+{
+	while (readl(pmc_base) & VT8500_PMC_BUSY_MASK)
+		cpu_relax();
+}
+
+static int vt8500_dclk_enable(struct clk_hw *hw)
+{
+	struct clk_device *cdev = to_clk_device(hw);
+	u32 en_val;
+	unsigned long flags = 0;
+
+	spin_lock_irqsave(cdev->lock, flags);
+
+	en_val = readl(cdev->en_reg);
+	en_val |= BIT(cdev->en_bit);
+	writel(en_val, cdev->en_reg);
+
+	spin_unlock_irqrestore(cdev->lock, flags);
+	return 0;
+}
+
+static void vt8500_dclk_disable(struct clk_hw *hw)
+{
+	struct clk_device *cdev = to_clk_device(hw);
+	u32 en_val;
+	unsigned long flags = 0;
+
+	spin_lock_irqsave(cdev->lock, flags);
+
+	en_val = readl(cdev->en_reg);
+	en_val &= ~BIT(cdev->en_bit);
+	writel(en_val, cdev->en_reg);
+
+	spin_unlock_irqrestore(cdev->lock, flags);
+}
+
+static int vt8500_dclk_is_enabled(struct clk_hw *hw)
+{
+	struct clk_device *cdev = to_clk_device(hw);
+	u32 en_val = (readl(cdev->en_reg) & BIT(cdev->en_bit));
+
+	return en_val ? 1 : 0;
+}
+
+static unsigned long vt8500_dclk_recalc_rate(struct clk_hw *hw,
+				unsigned long parent_rate)
+{
+	struct clk_device *cdev = to_clk_device(hw);
+	u32 div = readl(cdev->div_reg) & cdev->div_mask;
+
+	/* Special case for SDMMC devices */
+	if ((cdev->div_mask == 0x3F) && (div & BIT(5)))
+		div = 64 * (div & 0x1f);
+
+	/* div == 0 is actually the highest divisor */
+	if (div == 0)
+		div = (cdev->div_mask + 1);
+
+	return parent_rate / div;
+}
+
+static long vt8500_dclk_round_rate(struct clk_hw *hw, unsigned long rate,
+				unsigned long *prate)
+{
+	struct clk_device *cdev = to_clk_device(hw);
+	u32 divisor;
+
+	if (rate == 0)
+		return 0;
+
+	divisor = *prate / rate;
+
+	/* If prate / rate would be decimal, incr the divisor */
+	if (rate * divisor < *prate)
+		divisor++;
+
+	/*
+	 * If this is a request for SDMMC we have to adjust the divisor
+	 * when >31 to use the fixed predivisor
+	 */
+	if ((cdev->div_mask == 0x3F) && (divisor > 31)) {
+		divisor = 64 * ((divisor / 64) + 1);
+	}
+
+	return *prate / divisor;
+}
+
+static int vt8500_dclk_set_rate(struct clk_hw *hw, unsigned long rate,
+				unsigned long parent_rate)
+{
+	struct clk_device *cdev = to_clk_device(hw);
+	u32 divisor;
+	unsigned long flags = 0;
+
+	if (rate == 0)
+		return 0;
+
+	divisor =  parent_rate / rate;
+
+	if (divisor == cdev->div_mask + 1)
+		divisor = 0;
+
+	/* SDMMC mask may need to be corrected before testing if its valid */
+	if ((cdev->div_mask == 0x3F) && (divisor > 31)) {
+		/*
+		 * Bit 5 is a fixed /64 predivisor. If the requested divisor
+		 * is >31 then correct for the fixed divisor being required.
+		 */
+		divisor = 0x20 + (divisor / 64);
+	}
+
+	if (divisor > cdev->div_mask) {
+		pr_err("%s: invalid divisor for clock\n", __func__);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(cdev->lock, flags);
+
+	vt8500_pmc_wait_busy();
+	writel(divisor, cdev->div_reg);
+	vt8500_pmc_wait_busy();
+
+	spin_unlock_irqrestore(cdev->lock, flags);
+
+	return 0;
+}
+
+
+static const struct clk_ops vt8500_gated_clk_ops = {
+	.enable = vt8500_dclk_enable,
+	.disable = vt8500_dclk_disable,
+	.is_enabled = vt8500_dclk_is_enabled,
+};
+
+static const struct clk_ops vt8500_divisor_clk_ops = {
+	.round_rate = vt8500_dclk_round_rate,
+	.set_rate = vt8500_dclk_set_rate,
+	.recalc_rate = vt8500_dclk_recalc_rate,
+};
+
+static const struct clk_ops vt8500_gated_divisor_clk_ops = {
+	.enable = vt8500_dclk_enable,
+	.disable = vt8500_dclk_disable,
+	.is_enabled = vt8500_dclk_is_enabled,
+	.round_rate = vt8500_dclk_round_rate,
+	.set_rate = vt8500_dclk_set_rate,
+	.recalc_rate = vt8500_dclk_recalc_rate,
+};
+
+#define CLK_INIT_GATED			BIT(0)
+#define CLK_INIT_DIVISOR		BIT(1)
+#define CLK_INIT_GATED_DIVISOR		(CLK_INIT_DIVISOR | CLK_INIT_GATED)
+
+static __init void vtwm_device_clk_init(struct device_node *node)
+{
+	u32 en_reg, div_reg;
+	struct clk_hw *hw;
+	struct clk_device *dev_clk;
+	const char *clk_name = node->name;
+	const char *parent_name;
+	struct clk_init_data init;
+	int rc;
+	int clk_init_flags = 0;
+
+	if (!pmc_base)
+		vtwm_set_pmc_base();
+
+	dev_clk = kzalloc(sizeof(*dev_clk), GFP_KERNEL);
+	if (WARN_ON(!dev_clk))
+		return;
+
+	dev_clk->lock = &_lock;
+
+	rc = of_property_read_u32(node, "enable-reg", &en_reg);
+	if (!rc) {
+		dev_clk->en_reg = pmc_base + en_reg;
+		rc = of_property_read_u32(node, "enable-bit", &dev_clk->en_bit);
+		if (rc) {
+			pr_err("%s: enable-bit property required for gated clock\n",
+								__func__);
+			return;
+		}
+		clk_init_flags |= CLK_INIT_GATED;
+	}
+
+	rc = of_property_read_u32(node, "divisor-reg", &div_reg);
+	if (!rc) {
+		dev_clk->div_reg = pmc_base + div_reg;
+		/*
+		 * use 0x1f as the default mask since it covers
+		 * almost all the clocks and reduces dts properties
+		 */
+		dev_clk->div_mask = 0x1f;
+
+		of_property_read_u32(node, "divisor-mask", &dev_clk->div_mask);
+		clk_init_flags |= CLK_INIT_DIVISOR;
+	}
+
+	of_property_read_string(node, "clock-output-names", &clk_name);
+
+	switch (clk_init_flags) {
+	case CLK_INIT_GATED:
+		init.ops = &vt8500_gated_clk_ops;
+		break;
+	case CLK_INIT_DIVISOR:
+		init.ops = &vt8500_divisor_clk_ops;
+		break;
+	case CLK_INIT_GATED_DIVISOR:
+		init.ops = &vt8500_gated_divisor_clk_ops;
+		break;
+	default:
+		pr_err("%s: Invalid clock description in device tree\n",
+								__func__);
+		kfree(dev_clk);
+		return;
+	}
+
+	init.name = clk_name;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = &parent_name;
+	init.num_parents = 1;
+
+	dev_clk->hw.init = &init;
+
+	hw = &dev_clk->hw;
+	rc = clk_hw_register(NULL, hw);
+	if (WARN_ON(rc)) {
+		kfree(dev_clk);
+		return;
+	}
+	rc = of_clk_add_hw_provider(node, of_clk_hw_simple_get, hw);
+	clk_hw_register_clkdev(hw, clk_name, NULL);
+}
+CLK_OF_DECLARE(vt8500_device, "via,vt8500-device-clock", vtwm_device_clk_init);
+
+/* PLL clock related functions */
+
+#define to_clk_pll(_hw) container_of(_hw, struct clk_pll, hw)
+
+/* Helper macros for PLL_VT8500 */
+#define VT8500_PLL_MUL(x)	((x & 0x1F) << 1)
+#define VT8500_PLL_DIV(x)	((x & 0x100) ? 1 : 2)
+
+#define VT8500_BITS_TO_FREQ(r, m, d)					\
+				((r / d) * m)
+
+#define VT8500_BITS_TO_VAL(m, d)					\
+				((d == 2 ? 0 : 0x100) | ((m >> 1) & 0x1F))
+
+/* Helper macros for PLL_WM8650 */
+#define WM8650_PLL_MUL(x)	(x & 0x3FF)
+#define WM8650_PLL_DIV(x)	(((x >> 10) & 7) * (1 << ((x >> 13) & 3)))
+
+#define WM8650_BITS_TO_FREQ(r, m, d1, d2)				\
+				(r * m / (d1 * (1 << d2)))
+
+#define WM8650_BITS_TO_VAL(m, d1, d2)					\
+				((d2 << 13) | (d1 << 10) | (m & 0x3FF))
+
+/* Helper macros for PLL_WM8750 */
+#define WM8750_PLL_MUL(x)	(((x >> 16) & 0xFF) + 1)
+#define WM8750_PLL_DIV(x)	((((x >> 8) & 1) + 1) * (1 << (x & 7)))
+
+#define WM8750_BITS_TO_FREQ(r, m, d1, d2)				\
+				(r * (m+1) / ((d1+1) * (1 << d2)))
+
+#define WM8750_BITS_TO_VAL(f, m, d1, d2)				\
+		((f << 24) | ((m - 1) << 16) | ((d1 - 1) << 8) | d2)
+
+/* Helper macros for PLL_WM8850 */
+#define WM8850_PLL_MUL(x)	((((x >> 16) & 0x7F) + 1) * 2)
+#define WM8850_PLL_DIV(x)	((((x >> 8) & 1) + 1) * (1 << (x & 3)))
+
+#define WM8850_BITS_TO_FREQ(r, m, d1, d2)				\
+				(r * ((m + 1) * 2) / ((d1+1) * (1 << d2)))
+
+#define WM8850_BITS_TO_VAL(m, d1, d2)					\
+		((((m / 2) - 1) << 16) | ((d1 - 1) << 8) | d2)
+
+static int vt8500_find_pll_bits(unsigned long rate, unsigned long parent_rate,
+				u32 *multiplier, u32 *prediv)
+{
+	unsigned long tclk;
+
+	/* sanity check */
+	if ((rate < parent_rate * 4) || (rate > parent_rate * 62)) {
+		pr_err("%s: requested rate out of range\n", __func__);
+		*multiplier = 0;
+		*prediv = 1;
+		return -EINVAL;
+	}
+	if (rate <= parent_rate * 31)
+		/* use the prediv to double the resolution */
+		*prediv = 2;
+	else
+		*prediv = 1;
+
+	*multiplier = rate / (parent_rate / *prediv);
+	tclk = (parent_rate / *prediv) * *multiplier;
+
+	if (tclk != rate)
+		pr_warn("%s: requested rate %lu, found rate %lu\n", __func__,
+								rate, tclk);
+
+	return 0;
+}
+
+/*
+ * M * parent [O1] => / P [O2] => / D [O3]
+ * Where O1 is 900MHz...3GHz;
+ * O2 is 600MHz >= (M * parent) / P >= 300MHz;
+ * M is 36...120 [25MHz parent]; D is 1 or 2 or 4 or 8.
+ * Possible ranges (O3):
+ * D = 8: 37,5MHz...75MHz
+ * D = 4: 75MHz...150MHz
+ * D = 2: 150MHz...300MHz
+ * D = 1: 300MHz...600MHz
+ */
+static int wm8650_find_pll_bits(unsigned long rate,
+	unsigned long parent_rate, u32 *multiplier, u32 *divisor1,
+	u32 *divisor2)
+{
+	unsigned long O1, min_err, rate_err;
+
+	if (!parent_rate || (rate < 37500000) || (rate > 600000000))
+		return -EINVAL;
+
+	*divisor2 = rate <= 75000000 ? 3 : rate <= 150000000 ? 2 :
+					   rate <= 300000000 ? 1 : 0;
+	/*
+	 * Divisor P cannot be calculated. Test all divisors and find where M
+	 * will be as close as possible to the requested rate.
+	 */
+	min_err = ULONG_MAX;
+	for (*divisor1 = 5; *divisor1 >= 3; (*divisor1)--) {
+		O1 = rate * *divisor1 * (1 << (*divisor2));
+		rate_err = O1 % parent_rate;
+		if (rate_err < min_err) {
+			*multiplier = O1 / parent_rate;
+			if (rate_err == 0)
+				return 0;
+
+			min_err = rate_err;
+		}
+	}
+
+	if ((*multiplier < 3) || (*multiplier > 1023))
+		return -EINVAL;
+
+	pr_warn("%s: rate error is %lu\n", __func__, min_err);
+
+	return 0;
+}
+
+static u32 wm8750_get_filter(u32 parent_rate, u32 divisor1)
+{
+	/* calculate frequency (MHz) after pre-divisor */
+	u32 freq = (parent_rate / 1000000) / (divisor1 + 1);
+
+	if ((freq < 10) || (freq > 200))
+		pr_warn("%s: PLL recommended input frequency 10..200Mhz (requested %d Mhz)\n",
+				__func__, freq);
+
+	if (freq >= 166)
+		return 7;
+	else if (freq >= 104)
+		return 6;
+	else if (freq >= 65)
+		return 5;
+	else if (freq >= 42)
+		return 4;
+	else if (freq >= 26)
+		return 3;
+	else if (freq >= 16)
+		return 2;
+	else if (freq >= 10)
+		return 1;
+
+	return 0;
+}
+
+static int wm8750_find_pll_bits(unsigned long rate, unsigned long parent_rate,
+				u32 *filter, u32 *multiplier, u32 *divisor1, u32 *divisor2)
+{
+	u32 mul;
+	int div1, div2;
+	unsigned long tclk, rate_err, best_err;
+
+	best_err = (unsigned long)-1;
+
+	/* Find the closest match (lower or equal to requested) */
+	for (div1 = 1; div1 >= 0; div1--)
+		for (div2 = 7; div2 >= 0; div2--)
+			for (mul = 0; mul <= 255; mul++) {
+				tclk = parent_rate * (mul + 1) / ((div1 + 1) * (1 << div2));
+				if (tclk > rate)
+					continue;
+				/* error will always be +ve */
+				rate_err = rate - tclk;
+				if (rate_err == 0) {
+					*filter = wm8750_get_filter(parent_rate, div1);
+					*multiplier = mul;
+					*divisor1 = div1;
+					*divisor2 = div2;
+					return 0;
+				}
+
+				if (rate_err < best_err) {
+					best_err = rate_err;
+					*multiplier = mul;
+					*divisor1 = div1;
+					*divisor2 = div2;
+				}
+			}
+
+	if (best_err == (unsigned long)-1) {
+		pr_warn("%s: impossible rate %lu\n", __func__, rate);
+		return -EINVAL;
+	}
+
+	/* if we got here, it wasn't an exact match */
+	pr_warn("%s: requested rate %lu, found rate %lu\n", __func__, rate,
+							rate - best_err);
+
+	*filter = wm8750_get_filter(parent_rate, *divisor1);
+
+	return 0;
+}
+
+static int wm8850_find_pll_bits(unsigned long rate, unsigned long parent_rate,
+				u32 *multiplier, u32 *divisor1, u32 *divisor2)
+{
+	u32 mul;
+	int div1, div2;
+	unsigned long tclk, rate_err, best_err;
+
+	best_err = (unsigned long)-1;
+
+	/* Find the closest match (lower or equal to requested) */
+	for (div1 = 1; div1 >= 0; div1--)
+		for (div2 = 3; div2 >= 0; div2--)
+			for (mul = 0; mul <= 127; mul++) {
+				tclk = parent_rate * ((mul + 1) * 2) /
+						((div1 + 1) * (1 << div2));
+				if (tclk > rate)
+					continue;
+				/* error will always be +ve */
+				rate_err = rate - tclk;
+				if (rate_err == 0) {
+					*multiplier = mul;
+					*divisor1 = div1;
+					*divisor2 = div2;
+					return 0;
+				}
+
+				if (rate_err < best_err) {
+					best_err = rate_err;
+					*multiplier = mul;
+					*divisor1 = div1;
+					*divisor2 = div2;
+				}
+			}
+
+	if (best_err == (unsigned long)-1) {
+		pr_warn("%s: impossible rate %lu\n", __func__, rate);
+		return -EINVAL;
+	}
+
+	/* if we got here, it wasn't an exact match */
+	pr_warn("%s: requested rate %lu, found rate %lu\n", __func__, rate,
+							rate - best_err);
+
+	return 0;
+}
+
+static int vtwm_pll_set_rate(struct clk_hw *hw, unsigned long rate,
+				unsigned long parent_rate)
+{
+	struct clk_pll *pll = to_clk_pll(hw);
+	u32 filter, mul, div1, div2;
+	u32 pll_val;
+	unsigned long flags = 0;
+	int ret;
+
+	/* sanity check */
+
+	switch (pll->type) {
+	case PLL_TYPE_VT8500:
+		ret = vt8500_find_pll_bits(rate, parent_rate, &mul, &div1);
+		if (!ret)
+			pll_val = VT8500_BITS_TO_VAL(mul, div1);
+		break;
+	case PLL_TYPE_WM8650:
+		ret = wm8650_find_pll_bits(rate, parent_rate, &mul, &div1, &div2);
+		if (!ret)
+			pll_val = WM8650_BITS_TO_VAL(mul, div1, div2);
+		break;
+	case PLL_TYPE_WM8750:
+		ret = wm8750_find_pll_bits(rate, parent_rate, &filter, &mul, &div1, &div2);
+		if (!ret)
+			pll_val = WM8750_BITS_TO_VAL(filter, mul, div1, div2);
+		break;
+	case PLL_TYPE_WM8850:
+		ret = wm8850_find_pll_bits(rate, parent_rate, &mul, &div1, &div2);
+		if (!ret)
+			pll_val = WM8850_BITS_TO_VAL(mul, div1, div2);
+		break;
+	default:
+		pr_err("%s: invalid pll type\n", __func__);
+		ret = -EINVAL;
+	}
+
+	if (ret)
+		return ret;
+
+	spin_lock_irqsave(pll->lock, flags);
+
+	vt8500_pmc_wait_busy();
+	writel(pll_val, pll->reg);
+	vt8500_pmc_wait_busy();
+
+	spin_unlock_irqrestore(pll->lock, flags);
+
+	return 0;
+}
+
+static long vtwm_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+				unsigned long *prate)
+{
+	struct clk_pll *pll = to_clk_pll(hw);
+	u32 filter, mul, div1, div2;
+	long round_rate;
+	int ret;
+
+	switch (pll->type) {
+	case PLL_TYPE_VT8500:
+		ret = vt8500_find_pll_bits(rate, *prate, &mul, &div1);
+		if (!ret)
+			round_rate = VT8500_BITS_TO_FREQ(*prate, mul, div1);
+		break;
+	case PLL_TYPE_WM8650:
+		ret = wm8650_find_pll_bits(rate, *prate, &mul, &div1, &div2);
+		if (!ret)
+			round_rate = WM8650_BITS_TO_FREQ(*prate, mul, div1, div2);
+		break;
+	case PLL_TYPE_WM8750:
+		ret = wm8750_find_pll_bits(rate, *prate, &filter, &mul, &div1, &div2);
+		if (!ret)
+			round_rate = WM8750_BITS_TO_FREQ(*prate, mul, div1, div2);
+		break;
+	case PLL_TYPE_WM8850:
+		ret = wm8850_find_pll_bits(rate, *prate, &mul, &div1, &div2);
+		if (!ret)
+			round_rate = WM8850_BITS_TO_FREQ(*prate, mul, div1, div2);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	if (ret)
+		return ret;
+
+	return round_rate;
+}
+
+static unsigned long vtwm_pll_recalc_rate(struct clk_hw *hw,
+				unsigned long parent_rate)
+{
+	struct clk_pll *pll = to_clk_pll(hw);
+	u32 pll_val = readl(pll->reg);
+	unsigned long pll_freq;
+
+	switch (pll->type) {
+	case PLL_TYPE_VT8500:
+		pll_freq = parent_rate * VT8500_PLL_MUL(pll_val);
+		pll_freq /= VT8500_PLL_DIV(pll_val);
+		break;
+	case PLL_TYPE_WM8650:
+		pll_freq = parent_rate * WM8650_PLL_MUL(pll_val);
+		pll_freq /= WM8650_PLL_DIV(pll_val);
+		break;
+	case PLL_TYPE_WM8750:
+		pll_freq = parent_rate * WM8750_PLL_MUL(pll_val);
+		pll_freq /= WM8750_PLL_DIV(pll_val);
+		break;
+	case PLL_TYPE_WM8850:
+		pll_freq = parent_rate * WM8850_PLL_MUL(pll_val);
+		pll_freq /= WM8850_PLL_DIV(pll_val);
+		break;
+	default:
+		pll_freq = 0;
+	}
+
+	return pll_freq;
+}
+
+static const struct clk_ops vtwm_pll_ops = {
+	.round_rate = vtwm_pll_round_rate,
+	.set_rate = vtwm_pll_set_rate,
+	.recalc_rate = vtwm_pll_recalc_rate,
+};
+
+static __init void vtwm_pll_clk_init(struct device_node *node, int pll_type)
+{
+	u32 reg;
+	struct clk_hw *hw;
+	struct clk_pll *pll_clk;
+	const char *clk_name = node->name;
+	const char *parent_name;
+	struct clk_init_data init;
+	int rc;
+
+	if (!pmc_base)
+		vtwm_set_pmc_base();
+
+	rc = of_property_read_u32(node, "reg", &reg);
+	if (WARN_ON(rc))
+		return;
+
+	pll_clk = kzalloc(sizeof(*pll_clk), GFP_KERNEL);
+	if (WARN_ON(!pll_clk))
+		return;
+
+	pll_clk->reg = pmc_base + reg;
+	pll_clk->lock = &_lock;
+	pll_clk->type = pll_type;
+
+	of_property_read_string(node, "clock-output-names", &clk_name);
+
+	init.name = clk_name;
+	init.ops = &vtwm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = &parent_name;
+	init.num_parents = 1;
+
+	pll_clk->hw.init = &init;
+
+	hw = &pll_clk->hw;
+	rc = clk_hw_register(NULL, &pll_clk->hw);
+	if (WARN_ON(rc)) {
+		kfree(pll_clk);
+		return;
+	}
+	rc = of_clk_add_hw_provider(node, of_clk_hw_simple_get, hw);
+	clk_hw_register_clkdev(hw, clk_name, NULL);
+}
+
+
+/* Wrappers for initialization functions */
+
+static void __init vt8500_pll_init(struct device_node *node)
+{
+	vtwm_pll_clk_init(node, PLL_TYPE_VT8500);
+}
+CLK_OF_DECLARE(vt8500_pll, "via,vt8500-pll-clock", vt8500_pll_init);
+
+static void __init wm8650_pll_init(struct device_node *node)
+{
+	vtwm_pll_clk_init(node, PLL_TYPE_WM8650);
+}
+CLK_OF_DECLARE(wm8650_pll, "wm,wm8650-pll-clock", wm8650_pll_init);
+
+static void __init wm8750_pll_init(struct device_node *node)
+{
+	vtwm_pll_clk_init(node, PLL_TYPE_WM8750);
+}
+CLK_OF_DECLARE(wm8750_pll, "wm,wm8750-pll-clock", wm8750_pll_init);
+
+static void __init wm8850_pll_init(struct device_node *node)
+{
+	vtwm_pll_clk_init(node, PLL_TYPE_WM8850);
+}
+CLK_OF_DECLARE(wm8850_pll, "wm,wm8850-pll-clock", wm8850_pll_init);