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Message-ID: <CADiBU3_5D-_djEM-s=9F6TepJU-zY4KySN2pvOji0Z5JTWszDg@mail.gmail.com>
Date:   Sat, 7 Nov 2020 00:29:28 +0800
From:   ChiYuan Huang <u0084500@...il.com>
To:     Lee Jones <lee.jones@...aro.org>, robh+dt@...nel.org
Cc:     cy_huang <cy_huang@...htek.com>,
        lkml <linux-kernel@...r.kernel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH v1 1/2] mfd: rt4831: Adds support for Richtek RT4831 MFD core

HI, Lee:
    Any advice about this rt4831 mfd patch?

cy_huang <u0084500@...il.com> 於 2020年11月2日 週一 上午11:13寫道:
>
> From: ChiYuan Huang <cy_huang@...htek.com>
>
> Adds support Richtek RT4831 MFD core.
> RT4831 includes backlight and DSV part that can provode display panel
> for postive and negative voltage and WLED driving.
>
> Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
> ---
>  drivers/mfd/Kconfig       |  11 +++++
>  drivers/mfd/Makefile      |   1 +
>  drivers/mfd/rt4831-core.c | 119 ++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 131 insertions(+)
>  create mode 100644 drivers/mfd/rt4831-core.c
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 8b99a13..a22f002 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1088,6 +1088,17 @@ config MFD_RDC321X
>           southbridge which provides access to GPIOs and Watchdog using the
>           southbridge PCI device configuration space.
>
> +config MFD_RT4831
> +       tristate "Richtek RT4831 WLED and DSV IC"
> +       depends on I2C
> +       select MFD_CORE
> +       select REGMAP_I2C
> +       help
> +         This enables support for the Richtek RT4831.
> +         RT4831 includes WLED driver and DisplayBias voltage(+/-) regulator.
> +         It's common used to provide the display power and to drive the
> +         display backlight WLED.
> +
>  config MFD_RT5033
>         tristate "Richtek RT5033 Power Management IC"
>         depends on I2C
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 1780019..4108141 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -235,6 +235,7 @@ obj-$(CONFIG_MFD_MENF21BMC) += menf21bmc.o
>  obj-$(CONFIG_MFD_HI6421_PMIC)  += hi6421-pmic-core.o
>  obj-$(CONFIG_MFD_HI655X_PMIC)   += hi655x-pmic.o
>  obj-$(CONFIG_MFD_DLN2)         += dln2.o
> +obj-$(CONFIG_MFD_RT4831)       += rt4831-core.o
>  obj-$(CONFIG_MFD_RT5033)       += rt5033.o
>  obj-$(CONFIG_MFD_SKY81452)     += sky81452.o
>
> diff --git a/drivers/mfd/rt4831-core.c b/drivers/mfd/rt4831-core.c
> new file mode 100644
> index 00000000..5342959
> --- /dev/null
> +++ b/drivers/mfd/rt4831-core.c
> @@ -0,0 +1,119 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/core.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +
> +#define RT4831_REG_REVISION    0x01
> +#define RT4831_REG_ENABLE      0x08
> +#define RT4831_REG_I2CPROT     0x15
> +
> +#define RICHTEK_VID            0x03
> +#define RT4831_VID_MASK                GENMASK(1, 0)
> +#define RT4831_RESET_MASK      BIT(7)
> +#define RT4831_I2CSAFETMR_MASK BIT(0)
> +
> +static const struct mfd_cell rt4831_subdevs[] = {
> +       OF_MFD_CELL("rt4831-backlight", NULL, NULL, 0, 0, "richtek,rt4831-backlight"),
> +       MFD_CELL_NAME("rt4831-regulator")
> +};
> +
> +static bool rt4831_is_accessible_reg(struct device *dev, unsigned int reg)
> +{
> +       if (reg >= RT4831_REG_REVISION && reg <= RT4831_REG_I2CPROT)
> +               return true;
> +       return false;
> +}
> +
> +static const struct regmap_config rt4831_regmap_config = {
> +       .reg_bits = 8,
> +       .val_bits = 8,
> +       .max_register = RT4831_REG_I2CPROT,
> +
> +       .readable_reg = rt4831_is_accessible_reg,
> +       .writeable_reg = rt4831_is_accessible_reg,
> +};
> +
> +static int rt4831_probe(struct i2c_client *client)
> +{
> +       struct gpio_desc *enable;
> +       struct regmap *regmap;
> +       unsigned int val;
> +       int ret;
> +
> +       enable = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH);
> +       if (IS_ERR(enable)) {
> +               dev_err(&client->dev, "Failed to get chip enable gpio\n");
> +               return PTR_ERR(enable);
> +       }
> +
> +       regmap = devm_regmap_init_i2c(client, &rt4831_regmap_config);
> +       if (IS_ERR(regmap)) {
> +               dev_err(&client->dev, "Failed to init regmap\n");
> +               return PTR_ERR(regmap);
> +       }
> +
> +       ret = regmap_read(regmap, RT4831_REG_REVISION, &val);
> +       if (ret) {
> +               dev_err(&client->dev, "Fail to get version id\n");
> +               return ret;
> +       }
> +
> +       if ((val & RT4831_VID_MASK) != RICHTEK_VID) {
> +               dev_err(&client->dev, "VID not matched, val = 0x%02x\n", val);
> +               return -ENODEV;
> +       }
> +
> +       /*
> +        * Used to prevent the abnormal shutdown.
> +        * If SCL/SDA both keep low for one second to reset HW.
> +        */
> +       ret = regmap_update_bits(regmap, RT4831_REG_I2CPROT, RT4831_I2CSAFETMR_MASK,
> +                                RT4831_I2CSAFETMR_MASK);
> +       if (ret) {
> +               dev_err(&client->dev, "Failed to enable I2C safety timer\n");
> +               return ret;
> +       }
> +
> +       return devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_AUTO, rt4831_subdevs,
> +                                   ARRAY_SIZE(rt4831_subdevs), NULL, 0, NULL);
> +}
> +
> +static int rt4831_remove(struct i2c_client *client)
> +{
> +       struct regmap *regmap = dev_get_regmap(&client->dev, NULL);
> +
> +       /* Make sure all off before module removal */
> +       return regmap_update_bits(regmap, RT4831_REG_ENABLE, RT4831_RESET_MASK, RT4831_RESET_MASK);
> +}
> +
> +static void rt4831_shutdown(struct i2c_client *client)
> +{
> +       struct regmap *regmap = dev_get_regmap(&client->dev, NULL);
> +
> +       /* Make sure all off before machine shutdown */
> +       regmap_update_bits(regmap, RT4831_REG_ENABLE, RT4831_RESET_MASK, RT4831_RESET_MASK);
> +}
> +
> +static const struct of_device_id __maybe_unused rt4831_of_match[] = {
> +       { .compatible = "richtek,rt4831", },
> +       {}
> +};
> +MODULE_DEVICE_TABLE(of, rt4831_of_match);
> +
> +static struct i2c_driver rt4831_driver = {
> +       .driver = {
> +               .name = "rt4831",
> +               .of_match_table = of_match_ptr(rt4831_of_match),
> +       },
> +       .probe_new = rt4831_probe,
> +       .remove = rt4831_remove,
> +       .shutdown = rt4831_shutdown,
> +};
> +module_i2c_driver(rt4831_driver);
> +
> +MODULE_AUTHOR("ChiYuan Huang <cy_huang@...htek.com>");
> +MODULE_LICENSE("GPL v2");
> --
> 2.7.4
>

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