linux-kernel - Re: [PATCH 2/4] mfd: simple-mfd-i2c: Adds Ampere's Altra SMpro support

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Message-ID: <20210226083114.GE641347@dell>
Date:   Fri, 26 Feb 2021 08:31:14 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Quan Nguyen <quan@...amperecomputing.com>
Cc:     Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...id.au>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Corbet <corbet@....net>, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-aspeed@...ts.ozlabs.org,
        openbmc@...ts.ozlabs.org,
        Open Source Submission <patches@...erecomputing.com>,
        Phong Vo <phong@...amperecomputing.com>,
        "Thang Q . Nguyen" <thang@...amperecomputing.com>
Subject: Re: [PATCH 2/4] mfd: simple-mfd-i2c: Adds Ampere's Altra SMpro
 support

On Thu, 25 Feb 2021, Quan Nguyen wrote:

> Adds an MFD driver for SMpro found on the Mt.Jade hardware reference
> platform with Ampere's Altra processor family.
> 
> Signed-off-by: Quan Nguyen <quan@...amperecomputing.com>
> ---
>  drivers/mfd/Kconfig          | 10 ++++++++++
>  drivers/mfd/simple-mfd-i2c.c | 15 +++++++++++++--
>  2 files changed, 23 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index b74efa469e90..5414371bdea1 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -77,6 +77,16 @@ config MFD_AS3711
>  	help
>  	  Support for the AS3711 PMIC from AMS
>  
> +config MFD_SMPRO
> +	tristate "Ampere Computing MFD SMpro core driver"
> +	select MFD_SIMPLE_MFD_I2C

Nice to see another user here.

> +	help
> +	  Say yes here to enable SMpro driver support for Ampere's Altra
> +	  processor family.
> +
> +	  Ampere's Altra SMpro exposes an I2C regmap interface that can
> +	  be accessed by child devices.
> +
>  config MFD_AS3722
>  	tristate "ams AS3722 Power Management IC"
>  	select MFD_CORE
> diff --git a/drivers/mfd/simple-mfd-i2c.c b/drivers/mfd/simple-mfd-i2c.c
> index 87f684cff9a1..0459a9fbd3f5 100644
> --- a/drivers/mfd/simple-mfd-i2c.c
> +++ b/drivers/mfd/simple-mfd-i2c.c
> @@ -21,14 +21,24 @@ static const struct regmap_config simple_regmap_config = {
>  	.val_bits = 8,
>  };
>  
> +static const struct regmap_config simple_word_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 16,
> +};
> +
>  static int simple_mfd_i2c_probe(struct i2c_client *i2c)
>  {
>  	const struct regmap_config *config;
>  	struct regmap *regmap;
>  
>  	config = device_get_match_data(&i2c->dev);
> -	if (!config)
> -		config = &simple_regmap_config;
> +	if (!config) {
> +		if (of_device_is_compatible(i2c->dev.of_node,
> +						"ampere,ac01-smpro"))

Could you use 'struct of_device_id's .data attribute instead please?

> +			config = &simple_word_regmap_config;
> +		else
> +			config = &simple_regmap_config;
> +	}
>  
>  	regmap = devm_regmap_init_i2c(i2c, config);
>  	if (IS_ERR(regmap))
> @@ -39,6 +49,7 @@ static int simple_mfd_i2c_probe(struct i2c_client *i2c)
>  
>  static const struct of_device_id simple_mfd_i2c_of_match[] = {
>  	{ .compatible = "kontron,sl28cpld" },
> +	{ .compatible = "ampere,ac01-smpro" },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match);

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