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SubjectRe: [PATCH v7 2/6] mfd: Support ROHM BD9576MUF and BD9573MUF
On Fri, 22 Jan 2021, Matti Vaittinen wrote:

> 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 since v6:
> - no changes
> drivers/mfd/Kconfig | 11 ++++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/rohm-bd9576.c | 108 +++++++++++++++++++++++++++++++
> include/linux/mfd/rohm-bd957x.h | 59 +++++++++++++++++
> include/linux/mfd/rohm-generic.h | 2 +
> 5 files changed, 181 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..f4dd9e438427
> --- /dev/null
> +++ b/drivers/mfd/rohm-bd9576.c
> @@ -0,0 +1,108 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +//
> +// Copyright (C) 2020 ROHM Semiconductors
> +//
> +// ROHM BD9576MUF and BD9573MUF PMIC driver

No C++ comments (save the SPDX line) please.

> +#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-pmic", },
> + { .name = "bd9576-wdt", },
> +};
> +
> +static struct mfd_cell bd9576_mfd_cells[] = {
> + { .name = "bd9576-pmic", },
> + { .name = "bd9576-wdt", },
> +};

What is a PMIC in this context?

To me a PMIC is a bunch of devices. What is this probing?

Maybe this is *-regulator?

> +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 *mfd;
> + int cells;
> + unsigned long chip_type;
> +
> + chip_type = (unsigned long)of_device_get_match_data(&i2c->dev);
> +
> + switch (chip_type) {
> + case ROHM_CHIP_TYPE_BD9576:
> + mfd = bd9576_mfd_cells;
> + cells = ARRAY_SIZE(bd9576_mfd_cells);
> + break;
> + case ROHM_CHIP_TYPE_BD9573:
> + mfd = bd9573_mfd_cells;
> + 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, mfd, cells,

This nomenclature is confusing.

cells and num_cells would clear it up.

> + 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..3e7ca6fe5d4f
> --- /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

Nit: Can you tab these out for improved readability please?

> +#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
> };
>

--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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