[PATCH] mfd: add regmap driver for rohm-bd718x7
Sascha Hauer
sha at pengutronix.de
Tue Jan 31 00:22:03 PST 2023
On Mon, Jan 30, 2023 at 08:16:22AM +0100, Ahmad Fatoum wrote:
> Rohm BD71837 is a PMIC for i.MX8MM, which is used on most boards
> supported by barebox. So far, we didn't need to change PMIC
> configuration after the initial setup in PBL, but to support future
> debugging and development, let's port the Linux MFD driver sans the
> regulators, so we get a regmap for interacting with the device.
>
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---
> drivers/mfd/Kconfig | 13 ++++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/rohm-bd718x7.c | 140 +++++++++++++++++++++++++++++++++++++
> include/mfd/bd71837.h | 3 +
> 4 files changed, 157 insertions(+)
> create mode 100644 drivers/mfd/rohm-bd718x7.c
Applied, thanks
Sascha
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index f1f7e27fadfe..39a40c2a3fb5 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -129,6 +129,19 @@ config MFD_AXP20X_I2C
> management ICs (PMICs) controlled with I2C.
> This driver currently only provide a character device in /dev.
>
> +config MFD_ROHM_BD718XX
> + tristate "ROHM BD71837 Power Management IC"
> + depends on I2C=y
> + depends on OFDEVICE
> + select REGMAP_I2C
> + help
> + Select this option to get support for the ROHM BD71837
> + Power Management ICs. BD71837 is designed to power processors like
> + NXP i.MX8. It contains 8 BUCK outputs and 7 LDOs, voltage monitoring
> + and emergency shut down as well as 32,768KHz clock output.
> +
> + This driver currently only provide a character device in /dev.
> +
> config MFD_ATMEL_SMC
> bool
> select MFD_SYSCON
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index b89ddab5947d..f19bf5365533 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -24,3 +24,4 @@ obj-$(CONFIG_MFD_ATMEL_FLEXCOM) += atmel-flexcom.o
> obj-$(CONFIG_MFD_RK808) += rk808.o
> obj-$(CONFIG_MFD_AXP20X_I2C) += axp20x-i2c.o axp20x.o
> obj-$(CONFIG_MFD_ATMEL_SMC) += atmel-smc.o
> +obj-$(CONFIG_MFD_ROHM_BD718XX) += rohm-bd718x7.o
> diff --git a/drivers/mfd/rohm-bd718x7.c b/drivers/mfd/rohm-bd718x7.c
> new file mode 100644
> index 000000000000..20c572b6d766
> --- /dev/null
> +++ b/drivers/mfd/rohm-bd718x7.c
> @@ -0,0 +1,140 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +//
> +// Copyright (C) 2018 ROHM Semiconductors
> +//
> +// ROHM BD71837MWV and BD71847MWV PMIC driver
> +//
> +// Datasheet for BD71837MWV available from
> +// https://www.rohm.com/datasheet/BD71837MWV/bd71837mwv-e
> +
> +#include <common.h>
> +#include <i2c/i2c.h>
> +#include <mfd/bd71837.h>
> +#include <linux/mfd/core.h>
> +#include <driver.h>
> +#include <poweroff.h>
> +#include <of.h>
> +#include <regmap.h>
> +
> +static struct mfd_cell bd71837_mfd_cells[] = {
> + { .name = "gpio-keys", },
> + { .name = "bd71837-clk", },
> + { .name = "bd71837-pmic", },
> +};
> +
> +static struct mfd_cell bd71847_mfd_cells[] = {
> + { .name = "gpio-keys", },
> + { .name = "bd71847-clk", },
> + { .name = "bd71847-pmic", },
> +};
> +
> +static const struct regmap_config bd718xx_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = BD718XX_MAX_REGISTER - 1,
> +};
> +
> +static int bd718xx_init_press_duration(struct regmap *regmap,
> + struct device *dev)
> +{
> + u32 short_press_ms, long_press_ms;
> + u32 short_press_value, long_press_value;
> + int ret;
> +
> + ret = of_property_read_u32(dev->of_node, "rohm,short-press-ms",
> + &short_press_ms);
> + if (!ret) {
> + short_press_value = min(15u, (short_press_ms + 250) / 500);
> + ret = regmap_update_bits(regmap, BD718XX_PWRONCONFIG0,
> + BD718XX_PWRBTN_PRESS_DURATION_MASK,
> + short_press_value);
> + if (ret) {
> + dev_err(dev, "Failed to init pwron short press\n");
> + return ret;
> + }
> + }
> +
> + ret = of_property_read_u32(dev->of_node, "rohm,long-press-ms",
> + &long_press_ms);
> + if (!ret) {
> + long_press_value = min(15u, (long_press_ms + 500) / 1000);
> + ret = regmap_update_bits(regmap, BD718XX_PWRONCONFIG1,
> + BD718XX_PWRBTN_PRESS_DURATION_MASK,
> + long_press_value);
> + if (ret) {
> + dev_err(dev, "Failed to init pwron long press\n");
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int bd718xx_i2c_probe(struct device *dev)
> +{
> + struct i2c_client *i2c = to_i2c_client(dev);
> + struct regmap *regmap;
> + int ret;
> + unsigned int chip_type;
> + struct mfd_cell *mfd;
> + int cells;
> +
> + chip_type = (unsigned int)(uintptr_t)device_get_match_data(dev);
> + switch (chip_type) {
> + case ROHM_CHIP_TYPE_BD71837:
> + mfd = bd71837_mfd_cells;
> + cells = ARRAY_SIZE(bd71837_mfd_cells);
> + break;
> + case ROHM_CHIP_TYPE_BD71847:
> + mfd = bd71847_mfd_cells;
> + cells = ARRAY_SIZE(bd71847_mfd_cells);
> + break;
> + default:
> + dev_err(dev, "Unknown device type");
> + return -EINVAL;
> + }
> +
> + regmap = regmap_init_i2c(i2c, &bd718xx_regmap_config);
> + if (IS_ERR(regmap)) {
> + dev_err(dev, "regmap initialization failed\n");
> + return PTR_ERR(regmap);
> + }
> +
> + ret = bd718xx_init_press_duration(regmap, dev);
> + if (ret)
> + return ret;
> +
> + ret = mfd_add_devices(dev, mfd, cells);
> + if (ret)
> + dev_err(dev, "Failed to create subdevices\n");
> +
> + return regmap_register_cdev(regmap, NULL);
> +}
> +
> +static const struct of_device_id bd718xx_of_match[] = {
> + {
> + .compatible = "rohm,bd71837",
> + .data = (void *)ROHM_CHIP_TYPE_BD71837,
> + },
> + {
> + .compatible = "rohm,bd71847",
> + .data = (void *)ROHM_CHIP_TYPE_BD71847,
> + },
> + {
> + .compatible = "rohm,bd71850",
> + .data = (void *)ROHM_CHIP_TYPE_BD71847,
> + },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, bd718xx_of_match);
> +
> +static struct driver bd718xx_i2c_driver = {
> + .name = "rohm-bd718x7",
> + .of_match_table = bd718xx_of_match,
> + .probe = bd718xx_i2c_probe,
> +};
> +coredevice_i2c_driver(bd718xx_i2c_driver);
> +
> +MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen at fi.rohmeurope.com>");
> +MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver");
> +MODULE_LICENSE("GPL");
> diff --git a/include/mfd/bd71837.h b/include/mfd/bd71837.h
> index 75e07e1de31e..4e285a647a92 100644
> --- a/include/mfd/bd71837.h
> +++ b/include/mfd/bd71837.h
> @@ -100,4 +100,7 @@ enum {
> #define BD71847_LDO5_RANGE_MASK 0x20
> #define BD71837_LDO7_MASK 0x0f
>
> +#define BD718XX_PWRBTN_PRESS_DURATION_MASK 0xF
> +
> +
> #endif
> --
> 2.30.2
>
>
>
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