Re: [PATCH 3/6] mfd: axp20x: Add support for RSB based AXP223 PMIC

Maxime Ripard
2015-10-16T06:42:03Z

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On Thu, Oct 15, 2015 at 12:32:19AM +0800, Chen-Yu Tsai wrote:
> The AXP223 is a new PMIC commonly paired with Allwinner A23/A33 SoCs.
> It is functionally identical to AXP221; only the regulator default
> voltage/status and the external host interface are different.
>
> Signed-off-by: Chen-Yu Tsai <wens@csie.org>
> ---
> drivers/mfd/Kconfig | 12 ++++++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/axp20x-core.c | 2 +
> drivers/mfd/axp20x-rsb.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/axp20x.h | 1 +
> 5 files changed, 109 insertions(+)
> create mode 100644 drivers/mfd/axp20x-rsb.c
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 9ba3feb3f2fc..6e5edb61d42e 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -84,6 +84,7 @@ config MFD_BCM590XX
> config MFD_AXP20X
> bool "X-Powers AXP series PMICs"
> select MFD_AXP20X_I2C
> + select MFD_AXP20X_RSB
>
> config MFD_AXP20X_CORE
> bool
> @@ -102,6 +103,17 @@ config MFD_AXP20X_I2C
> components like regulators or the PEK (Power Enable Key) under the
> corresponding menus.
>
> +config MFD_AXP20X_RSB
> + bool "X-Powers AXP series RSB PMICs"
> + select MFD_AXP20X_CORE
> + depends on SUNXI_RSB=y

Do we need that? Even if the bus is compiled as a module, the driver
will not be probed before that, will it?

> + help
> + If you say Y here you get support for the X-Powers AXP series RSB
> + based power management ICs (PMICs).
> + This driver include only the core APIs. You have to select individual
> + components like regulators or the PEK (Power Enable Key) under the
> + corresponding menus.
> +
> config MFD_CROS_EC
> tristate "ChromeOS Embedded Controller"
> select MFD_CORE
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index ce3ad5fd4e2f..1eb278619dd6 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -108,6 +108,7 @@ obj-$(CONFIG_MFD_DA9052_SPI) += da9052-spi.o
> obj-$(CONFIG_MFD_DA9052_I2C) += da9052-i2c.o
> obj-$(CONFIG_MFD_AXP20X_CORE) += axp20x-core.o
> obj-$(CONFIG_MFD_AXP20X_I2C) += axp20x-i2c.o
> +obj-$(CONFIG_MFD_AXP20X_RSB) += axp20x-rsb.o
>
> obj-$(CONFIG_MFD_LP3943) += lp3943.o
> obj-$(CONFIG_MFD_LP8788) += lp8788.o lp8788-irq.o
> diff --git a/drivers/mfd/axp20x-core.c b/drivers/mfd/axp20x-core.c
> index dd33548d93c4..baecccb6d400 100644
> --- a/drivers/mfd/axp20x-core.c
> +++ b/drivers/mfd/axp20x-core.c
> @@ -32,6 +32,7 @@ static const char * const axp20x_model_names[] = {
> "AXP202",
> "AXP209",
> "AXP221",
> + "AXP223",
> "AXP288",
> };
>
> @@ -575,6 +576,7 @@ int axp20x_match_device(struct axp20x_dev *axp20x, struct device *dev)
> axp20x->regmap_irq_chip = &axp20x_regmap_irq_chip;
> break;
> case AXP221_ID:
> + case AXP223_ID:
> axp20x->nr_cells = ARRAY_SIZE(axp22x_cells);
> axp20x->cells = axp22x_cells;
> axp20x->regmap_cfg = &axp22x_regmap_config;
> diff --git a/drivers/mfd/axp20x-rsb.c b/drivers/mfd/axp20x-rsb.c
> new file mode 100644
> index 000000000000..5d053d177717
> --- /dev/null
> +++ b/drivers/mfd/axp20x-rsb.c
> @@ -0,0 +1,93 @@
> +/*
> + * axp20x-rsb.c - RSB driver for the X-Powers' Power Management ICs
> + *
> + * AXP20x typically comprises an adaptive USB-Compatible PWM charger, BUCK DC-DC
> + * converters, LDOs, multiple 12-bit ADCs of voltage, current and temperature
> + * as well as configurable GPIOs.
> + *
> + * This driver supports the RSB variants.
> + *
> + * Author: Chen-Yu Tsai <wens@csie.org>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/err.h>
> +#include <linux/module.h>
> +#include <linux/mfd/axp20x.h>
> +#include <linux/of_device.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/soc/sunxi/sunxi_rsb.h>
> +
> +static const struct of_device_id axp20x_sunxi_rsb_of_match[] = {
> + { .compatible = "x-powers,axp223", .data = (void *) AXP223_ID },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, axp20x_sunxi_rsb_of_match);
> +
> +static int axp20x_sunxi_rsb_match_device(struct axp20x_dev *axp20x,
> + struct device *dev)
> +{
> + const struct of_device_id *of_id;
> +
> + of_id = of_match_device(axp20x_sunxi_rsb_of_match, dev);
> + if (!of_id) {
> + dev_err(dev, "Unable to match OF ID\n");
> + return -ENODEV;
> + }
> + axp20x->variant = (long) of_id->data;
> +
> + return axp20x_match_device(axp20x, dev);
> +}
> +
> +static int axp20x_sunxi_rsb_probe(struct sunxi_rsb_device *rdev)
> +{
> + struct axp20x_dev *axp20x;
> + int ret;
> +
> + axp20x = devm_kzalloc(&rdev->dev, sizeof(*axp20x), GFP_KERNEL);
> + if (!axp20x)
> + return -ENOMEM;
> +
> + ret = axp20x_sunxi_rsb_match_device(axp20x, &rdev->dev);
> + if (ret)
> + return ret;
> +
> + axp20x->dev = &rdev->dev;
> + axp20x->irq = rdev->irq;
> + sunxi_rsb_device_set_drvdata(rdev, axp20x);
> +
> + axp20x->regmap = devm_regmap_init_sunxi_rsb(rdev, axp20x->regmap_cfg);
> + if (IS_ERR(axp20x->regmap)) {
> + ret = PTR_ERR(axp20x->regmap);
> + dev_err(&rdev->dev, "regmap init failed: %d\n", ret);
> + return ret;
> + }
> +
> + return axp20x_device_probe(axp20x);
> +}
> +
> +static int axp20x_sunxi_rsb_remove(struct sunxi_rsb_device *rdev)
> +{
> + struct axp20x_dev *axp20x = sunxi_rsb_device_get_drvdata(rdev);
> +
> + return axp20x_device_remove(axp20x);
> +}
> +
> +static struct sunxi_rsb_driver axp20x_sunxi_rsb_driver = {
> + .driver = {
> + .name = "axp20x-sunxi-rsb",

Do we need to be that verbose in the name of the driver?

axp20x-rsb should be enough, especially since it's also the name of
your file.

Looks good otherwise, thanks!
Maxime

--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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