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-rw-r--r--drivers/mfd/rohm-bd9576.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/drivers/mfd/rohm-bd9576.c b/drivers/mfd/rohm-bd9576.c
new file mode 100644
index 000000000..f37cd4f27
--- /dev/null
+++ b/drivers/mfd/rohm-bd9576.c
@@ -0,0 +1,189 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2021 ROHM Semiconductors
+ *
+ * ROHM BD9576MUF and BD9573MUF PMIC driver
+ */
+
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/rohm-bd957x.h>
+#include <linux/mfd/rohm-generic.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+
+enum {
+ BD957X_REGULATOR_CELL,
+ BD957X_WDT_CELL,
+};
+
+/*
+ * Due to the BD9576MUF nasty IRQ behaviour we don't always populate IRQs.
+ * These will be added to regulator resources only if IRQ information for the
+ * PMIC is populated in device-tree.
+ */
+static const struct resource bd9576_regulator_irqs[] = {
+ DEFINE_RES_IRQ_NAMED(BD9576_INT_THERM, "bd9576-temp"),
+ DEFINE_RES_IRQ_NAMED(BD9576_INT_OVD, "bd9576-ovd"),
+ DEFINE_RES_IRQ_NAMED(BD9576_INT_UVD, "bd9576-uvd"),
+};
+
+static struct mfd_cell bd9573_mfd_cells[] = {
+ [BD957X_REGULATOR_CELL] = { .name = "bd9573-regulator", },
+ [BD957X_WDT_CELL] = { .name = "bd9576-wdt", },
+};
+
+static struct mfd_cell bd9576_mfd_cells[] = {
+ [BD957X_REGULATOR_CELL] = { .name = "bd9576-regulator", },
+ [BD957X_WDT_CELL] = { .name = "bd9576-wdt", },
+};
+
+static const struct regmap_range volatile_ranges[] = {
+ regmap_reg_range(BD957X_REG_SMRB_ASSERT, BD957X_REG_SMRB_ASSERT),
+ regmap_reg_range(BD957X_REG_PMIC_INTERNAL_STAT,
+ BD957X_REG_PMIC_INTERNAL_STAT),
+ regmap_reg_range(BD957X_REG_INT_THERM_STAT, BD957X_REG_INT_THERM_STAT),
+ regmap_reg_range(BD957X_REG_INT_OVP_STAT, BD957X_REG_INT_SYS_STAT),
+ regmap_reg_range(BD957X_REG_INT_MAIN_STAT, BD957X_REG_INT_MAIN_STAT),
+};
+
+static const struct regmap_access_table volatile_regs = {
+ .yes_ranges = &volatile_ranges[0],
+ .n_yes_ranges = ARRAY_SIZE(volatile_ranges),
+};
+
+static struct regmap_config bd957x_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .volatile_table = &volatile_regs,
+ .max_register = BD957X_MAX_REGISTER,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static struct regmap_irq bd9576_irqs[] = {
+ REGMAP_IRQ_REG(BD9576_INT_THERM, 0, BD957X_MASK_INT_MAIN_THERM),
+ REGMAP_IRQ_REG(BD9576_INT_OVP, 0, BD957X_MASK_INT_MAIN_OVP),
+ REGMAP_IRQ_REG(BD9576_INT_SCP, 0, BD957X_MASK_INT_MAIN_SCP),
+ REGMAP_IRQ_REG(BD9576_INT_OCP, 0, BD957X_MASK_INT_MAIN_OCP),
+ REGMAP_IRQ_REG(BD9576_INT_OVD, 0, BD957X_MASK_INT_MAIN_OVD),
+ REGMAP_IRQ_REG(BD9576_INT_UVD, 0, BD957X_MASK_INT_MAIN_UVD),
+ REGMAP_IRQ_REG(BD9576_INT_UVP, 0, BD957X_MASK_INT_MAIN_UVP),
+ REGMAP_IRQ_REG(BD9576_INT_SYS, 0, BD957X_MASK_INT_MAIN_SYS),
+};
+
+static struct regmap_irq_chip bd9576_irq_chip = {
+ .name = "bd9576_irq",
+ .irqs = &bd9576_irqs[0],
+ .num_irqs = ARRAY_SIZE(bd9576_irqs),
+ .status_base = BD957X_REG_INT_MAIN_STAT,
+ .mask_base = BD957X_REG_INT_MAIN_MASK,
+ .ack_base = BD957X_REG_INT_MAIN_STAT,
+ .init_ack_masked = true,
+ .num_regs = 1,
+ .irq_reg_stride = 1,
+};
+
+static int bd957x_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ int ret;
+ struct regmap *regmap;
+ struct mfd_cell *cells;
+ int num_cells;
+ unsigned long chip_type;
+ struct irq_domain *domain;
+ bool usable_irqs;
+
+ chip_type = (unsigned long)of_device_get_match_data(&i2c->dev);
+
+ switch (chip_type) {
+ case ROHM_CHIP_TYPE_BD9576:
+ cells = bd9576_mfd_cells;
+ num_cells = ARRAY_SIZE(bd9576_mfd_cells);
+ usable_irqs = !!i2c->irq;
+ break;
+ case ROHM_CHIP_TYPE_BD9573:
+ cells = bd9573_mfd_cells;
+ num_cells = ARRAY_SIZE(bd9573_mfd_cells);
+ /*
+ * BD9573 only supports fatal IRQs which we can not handle
+ * because SoC is going to lose the power.
+ */
+ usable_irqs = false;
+ break;
+ default:
+ dev_err(&i2c->dev, "Unknown device type");
+ return -EINVAL;
+ }
+
+ regmap = devm_regmap_init_i2c(i2c, &bd957x_regmap);
+ if (IS_ERR(regmap)) {
+ dev_err(&i2c->dev, "Failed to initialize Regmap\n");
+ return PTR_ERR(regmap);
+ }
+
+ /*
+ * BD9576 behaves badly. It kepts IRQ line asserted for the whole
+ * duration of detected HW condition (like over temperature). So we
+ * don't require IRQ to be populated.
+ * If IRQ information is not given, then we mask all IRQs and do not
+ * provide IRQ resources to regulator driver - which then just omits
+ * the notifiers.
+ */
+ if (usable_irqs) {
+ struct regmap_irq_chip_data *irq_data;
+ struct mfd_cell *regulators;
+
+ regulators = &bd9576_mfd_cells[BD957X_REGULATOR_CELL];
+ regulators->resources = bd9576_regulator_irqs;
+ regulators->num_resources = ARRAY_SIZE(bd9576_regulator_irqs);
+
+ ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq,
+ IRQF_ONESHOT, 0,
+ &bd9576_irq_chip, &irq_data);
+ if (ret) {
+ dev_err(&i2c->dev, "Failed to add IRQ chip\n");
+ return ret;
+ }
+ domain = regmap_irq_get_domain(irq_data);
+ } else {
+ ret = regmap_update_bits(regmap, BD957X_REG_INT_MAIN_MASK,
+ BD957X_MASK_INT_ALL,
+ BD957X_MASK_INT_ALL);
+ if (ret)
+ return ret;
+ domain = NULL;
+ }
+
+ ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, cells,
+ num_cells, NULL, 0, domain);
+ if (ret)
+ dev_err(&i2c->dev, "Failed to create subdevices\n");
+
+ return ret;
+}
+
+static const struct of_device_id bd957x_of_match[] = {
+ { .compatible = "rohm,bd9576", .data = (void *)ROHM_CHIP_TYPE_BD9576, },
+ { .compatible = "rohm,bd9573", .data = (void *)ROHM_CHIP_TYPE_BD9573, },
+ { },
+};
+MODULE_DEVICE_TABLE(of, bd957x_of_match);
+
+static struct i2c_driver bd957x_drv = {
+ .driver = {
+ .name = "rohm-bd957x",
+ .of_match_table = bd957x_of_match,
+ },
+ .probe = &bd957x_i2c_probe,
+};
+module_i2c_driver(bd957x_drv);
+
+MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
+MODULE_DESCRIPTION("ROHM BD9576MUF and BD9573MUF Power Management IC driver");
+MODULE_LICENSE("GPL");