[PATCH v8 2/6] mfd: Support ROHM BD9576MUF and BD9573MUF

Matti Vaittinen
2021-02-11T09:53:30Z

Add core support for ROHM BD9576MUF and BD9573MUF PMICs which are
mainly used to power the R-Car series processors.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---
Changes:
- Comments fixed based on suggestions from Lee
- Name of regulator cell changed as suggested by Lee
- Renamed MFD cell variables for better readability
- Aligned header definitions for better readability

drivers/mfd/Kconfig | 11 ++++
drivers/mfd/Makefile | 1 +
drivers/mfd/rohm-bd9576.c | 109 +++++++++++++++++++++++++++++++
include/linux/mfd/rohm-bd957x.h | 59 +++++++++++++++++
include/linux/mfd/rohm-generic.h | 2 +
5 files changed, 182 insertions(+)
create mode 100644 drivers/mfd/rohm-bd9576.c
create mode 100644 include/linux/mfd/rohm-bd957x.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index bdfce7b15621..53c7c96283bd 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1998,6 +1998,17 @@ config MFD_ROHM_BD71828
Also included is a Coulomb counter, a real-time clock (RTC), and
a 32.768 kHz clock gate.

+config MFD_ROHM_BD957XMUF
+ tristate "ROHM BD9576MUF and BD9573MUF Power Management ICs"
+ depends on I2C=y
+ depends on OF
+ select REGMAP_I2C
+ select MFD_CORE
+ help
+ Select this option to get support for the ROHM BD9576MUF and
+ BD9573MUF Power Management ICs. BD9576 and BD9573 are primarily
+ designed to be used to power R-Car series processors.
+
config MFD_STM32_LPTIMER
tristate "Support for STM32 Low-Power Timer"
depends on (ARCH_STM32 && OF) || COMPILE_TEST
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 14fdb188af02..e58fae024bb2 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -262,6 +262,7 @@ obj-$(CONFIG_RAVE_SP_CORE) += rave-sp.o
obj-$(CONFIG_MFD_ROHM_BD70528) += rohm-bd70528.o
obj-$(CONFIG_MFD_ROHM_BD71828) += rohm-bd71828.o
obj-$(CONFIG_MFD_ROHM_BD718XX) += rohm-bd718x7.o
+obj-$(CONFIG_MFD_ROHM_BD957XMUF) += rohm-bd9576.o
obj-$(CONFIG_MFD_STMFX) += stmfx.o
obj-$(CONFIG_MFD_KHADAS_MCU) += khadas-mcu.o

diff --git a/drivers/mfd/rohm-bd9576.c b/drivers/mfd/rohm-bd9576.c
new file mode 100644
index 000000000000..efd439677c9e
--- /dev/null
+++ b/drivers/mfd/rohm-bd9576.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2020 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>
+
+static struct mfd_cell bd9573_mfd_cells[] = {
+ { .name = "bd9573-regulator", },
+ { .name = "bd9576-wdt", },
+};
+
+static struct mfd_cell bd9576_mfd_cells[] = {
+ { .name = "bd9576-regulator", },
+ { .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 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;
+
+ 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);
+ break;
+ case ROHM_CHIP_TYPE_BD9573:
+ cells = bd9573_mfd_cells;
+ num_cells = ARRAY_SIZE(bd9573_mfd_cells);
+ 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);
+ }
+
+ ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, cells,
+ num_cells, NULL, 0, NULL);
+ 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");
diff --git a/include/linux/mfd/rohm-bd957x.h b/include/linux/mfd/rohm-bd957x.h
new file mode 100644
index 000000000000..ae59c0f7188d
--- /dev/null
+++ b/include/linux/mfd/rohm-bd957x.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (C) 2020 ROHM Semiconductors */
+
+#ifndef __LINUX_MFD_BD957X_H__
+#define __LINUX_MFD_BD957X_H__
+
+enum {
+ BD957X_VD50,
+ BD957X_VD18,
+ BD957X_VDDDR,
+ BD957X_VD10,
+ BD957X_VOUTL1,
+ BD957X_VOUTS1,
+};
+
+#define BD957X_REG_SMRB_ASSERT 0x15
+#define BD957X_REG_PMIC_INTERNAL_STAT 0x20
+#define BD957X_REG_INT_THERM_STAT 0x23
+#define BD957X_REG_INT_THERM_MASK 0x24
+#define BD957X_REG_INT_OVP_STAT 0x25
+#define BD957X_REG_INT_SCP_STAT 0x26
+#define BD957X_REG_INT_OCP_STAT 0x27
+#define BD957X_REG_INT_OVD_STAT 0x28
+#define BD957X_REG_INT_UVD_STAT 0x29
+#define BD957X_REG_INT_UVP_STAT 0x2a
+#define BD957X_REG_INT_SYS_STAT 0x2b
+#define BD957X_REG_INT_SYS_MASK 0x2c
+#define BD957X_REG_INT_MAIN_STAT 0x30
+#define BD957X_REG_INT_MAIN_MASK 0x31
+
+#define BD957X_REG_WDT_CONF 0x16
+
+#define BD957X_REG_POW_TRIGGER1 0x41
+#define BD957X_REG_POW_TRIGGER2 0x42
+#define BD957X_REG_POW_TRIGGER3 0x43
+#define BD957X_REG_POW_TRIGGER4 0x44
+#define BD957X_REG_POW_TRIGGERL1 0x45
+#define BD957X_REG_POW_TRIGGERS1 0x46
+
+#define BD957X_REGULATOR_EN_MASK 0xff
+#define BD957X_REGULATOR_DIS_VAL 0xff
+
+#define BD957X_VSEL_REG_MASK 0xff
+
+#define BD957X_MASK_VOUT1_TUNE 0x87
+#define BD957X_MASK_VOUT2_TUNE 0x87
+#define BD957X_MASK_VOUT3_TUNE 0x1f
+#define BD957X_MASK_VOUT4_TUNE 0x1f
+#define BD957X_MASK_VOUTL1_TUNE 0x87
+
+#define BD957X_REG_VOUT1_TUNE 0x50
+#define BD957X_REG_VOUT2_TUNE 0x53
+#define BD957X_REG_VOUT3_TUNE 0x56
+#define BD957X_REG_VOUT4_TUNE 0x59
+#define BD957X_REG_VOUTL1_TUNE 0x5c
+
+#define BD957X_MAX_REGISTER 0x61
+
+#endif
diff --git a/include/linux/mfd/rohm-generic.h b/include/linux/mfd/rohm-generic.h
index 4283b5b33e04..58b4f1a0f4af 100644
--- a/include/linux/mfd/rohm-generic.h
+++ b/include/linux/mfd/rohm-generic.h
@@ -12,6 +12,8 @@ enum rohm_chip_type {
ROHM_CHIP_TYPE_BD71847,
ROHM_CHIP_TYPE_BD70528,
ROHM_CHIP_TYPE_BD71828,
+ ROHM_CHIP_TYPE_BD9576,
+ ROHM_CHIP_TYPE_BD9573,
ROHM_CHIP_TYPE_AMOUNT
};