Re: [PATCH v3 01/10] mfd: AXP20x: Add mfd driver for AXP20x PMIC

[Lee Jones <lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>]

> This patch introduces the preliminary support for PMICs X-Powers AXP202
> and AXP209. The AXP209 and AXP202 are the PMUs (Power Management Unit)
> used by A10, A13 and A20 SoCs and developed by X-Powers, a sister company
> of Allwinner.
> 
> The core enables support for two subsystems:
> - PEK (Power Enable Key)
> - Regulators
> 
> Signed-off-by: Carlo Caione <carlo-KA+7E9HrN00dnm+yROfE0A@public.gmane.org>
> ---
>  drivers/mfd/Kconfig        |  12 +++
>  drivers/mfd/Makefile       |   1 +
>  drivers/mfd/axp20x.c       | 240 +++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/axp20x.h | 180 ++++++++++++++++++++++++++++++++++
>  4 files changed, 433 insertions(+)
>  create mode 100644 drivers/mfd/axp20x.c
>  create mode 100644 include/linux/mfd/axp20x.h
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 49bb445..24ba61a 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -59,6 +59,18 @@ config MFD_AAT2870_CORE
>  	  additional drivers must be enabled in order to use the
>  	  functionality of the device.
>  
> +config MFD_AXP20X
> +	bool "X-Powers AXP20X"
> +	select MFD_CORE
> +	select REGMAP_I2C
> +	select REGMAP_IRQ
> +	depends on I2C=y
> +	help
> +	  If you say Y here you get support for the AXP20X.
> +	  This driver provides common support for accessing the device,
> +	  additional drivers must be enabled in order to use the
> +	  functionality of the device.

Please tell us what this device is and what sub-devices are available?

[...]

> diff --git a/drivers/mfd/axp20x.c b/drivers/mfd/axp20x.c
> new file mode 100644
> index 0000000..f77a663
> --- /dev/null
> +++ b/drivers/mfd/axp20x.c
> @@ -0,0 +1,240 @@
> +/*
> + * axp20x.c - MFD core driver for the X-Powers AXP202 and AXP209

... which consist of ...

[...]

> +static struct resource axp20x_pek_resources[] = {
> +	{
> +		.name	= "PEK_DBR",
> +		.start	= AXP20X_IRQ_PEK_RIS_EDGE,
> +		.end	= AXP20X_IRQ_PEK_RIS_EDGE,
> +		.flags	= IORESOURCE_IRQ,
> +	}, {
> +		.name	= "PEK_DBF",
> +		.start	= AXP20X_IRQ_PEK_FAL_EDGE,
> +		.end	= AXP20X_IRQ_PEK_FAL_EDGE,
> +		.flags	= IORESOURCE_IRQ,
> +	},
> +};

Have you considered doing this in the Device Tree? It's a lot less
code/overhead.

> +static const struct i2c_device_id axp20x_i2c_id[] = {
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(i2c, axp20x_i2c_id);
 
We really should consider changing the I2C subsystem!

Can you add a comment here describing why we have to add this
seemingly pointless empty struct please?

> +static struct mfd_cell axp20x_cells[] = {
> +	{
> +		.name		= "axp20x-pek",
> +		.num_resources	= ARRAY_SIZE(axp20x_pek_resources),
> +		.resources	= axp20x_pek_resources,
> +	}, {
> +		.name		= "axp20x-regulator",
> +	},
> +};

Do these drivers don't look inside the DTB at all?

[...]

> +	of_id = of_match_device(axp20x_of_match, &i2c->dev);
> +	if (!of_id) {
> +		dev_err(&i2c->dev, "Unable to setup AXP20X data\n");
> +		return -ENODEV;
> +	}
> +	axp20x->variant = (int) of_id->data;

'variant' needs to be a (unsigned?) long or it will break on 64bit
architectures.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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