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Date: Thu, 28 Mar 2024 11:37:25 +0000
From: Lee Jones <lee@kernel.org>
To: Bhargav Raviprakash <bhargav.r@ltts.com>
Cc: linux-kernel@vger.kernel.org, m.nirmaladevi@ltts.com,
	robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
	conor+dt@kernel.org, jpanis@baylibre.com,
	devicetree@vger.kernel.org, arnd@arndb.de,
	gregkh@linuxfoundation.org, lgirdwood@gmail.com, broonie@kernel.org,
	linus.walleij@linaro.org, linux-gpio@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, nm@ti.com, vigneshr@ti.com,
	kristo@kernel.org, eblanc@baylibre.com
Subject: Re: [PATCH v4 03/11] mfd: tps6594: add regmap config in match data
Message-ID: <20240328113725.GA13211@google.com>
References: <20240320102559.464981-1-bhargav.r@ltts.com>
 <20240320102559.464981-4-bhargav.r@ltts.com>
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In-Reply-To: <20240320102559.464981-4-bhargav.r@ltts.com>

On Wed, 20 Mar 2024, Bhargav Raviprakash wrote:

> Introduces a new struct tps6594_match_data. This struct holds fields for
> chip id and regmap config. Using this struct in of_device_id data field.
> This helps in adding support for TPS65224 PMIC.
> 
> Signed-off-by: Bhargav Raviprakash <bhargav.r@ltts.com>
> Acked-by: Julien Panis <jpanis@baylibre.com>
> ---
>  drivers/mfd/tps6594-i2c.c   | 24 ++++++++++++++++--------
>  drivers/mfd/tps6594-spi.c   | 24 ++++++++++++++++--------
>  include/linux/mfd/tps6594.h | 11 +++++++++++
>  3 files changed, 43 insertions(+), 16 deletions(-)

Mostly fine, just a couple of nits.

Firstly the subject lines for the entire set are inconsistent.

Please use the style set by the subsystem:

  `git log --oneline -- <subsystem>` is your friend.

> diff --git a/drivers/mfd/tps6594-i2c.c b/drivers/mfd/tps6594-i2c.c
> index c125b474b..9e2ed48b7 100644
> --- a/drivers/mfd/tps6594-i2c.c
> +++ b/drivers/mfd/tps6594-i2c.c
> @@ -192,10 +192,16 @@ static const struct regmap_config tps6594_i2c_regmap_config = {
>  	.write = tps6594_i2c_write,
>  };
>  
> +static const struct tps6594_match_data match_data[] = {
> +	[TPS6594] = {TPS6594, &tps6594_i2c_regmap_config},
> +	[TPS6593] = {TPS6593, &tps6594_i2c_regmap_config},
> +	[LP8764] = {LP8764, &tps6594_i2c_regmap_config},

Spaces after the '{' and before the '}' please.
> +};
> +
>  static const struct of_device_id tps6594_i2c_of_match_table[] = {
> -	{ .compatible = "ti,tps6594-q1", .data = (void *)TPS6594, },
> -	{ .compatible = "ti,tps6593-q1", .data = (void *)TPS6593, },
> -	{ .compatible = "ti,lp8764-q1",  .data = (void *)LP8764,  },
> +	{ .compatible = "ti,tps6594-q1", .data = &match_data[TPS6594], },
> +	{ .compatible = "ti,tps6593-q1", .data = &match_data[TPS6593], },
> +	{ .compatible = "ti,lp8764-q1",  .data = &match_data[LP8764], },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, tps6594_i2c_of_match_table);
> @@ -205,6 +211,7 @@ static int tps6594_i2c_probe(struct i2c_client *client)
>  	struct device *dev = &client->dev;
>  	struct tps6594 *tps;
>  	const struct of_device_id *match;
> +	const struct tps6594_match_data *mdata;
>  
>  	tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
>  	if (!tps)
> @@ -216,14 +223,15 @@ static int tps6594_i2c_probe(struct i2c_client *client)
>  	tps->reg = client->addr;
>  	tps->irq = client->irq;
>  
> -	tps->regmap = devm_regmap_init(dev, NULL, client, &tps6594_i2c_regmap_config);
> -	if (IS_ERR(tps->regmap))
> -		return dev_err_probe(dev, PTR_ERR(tps->regmap), "Failed to init regmap\n");
> -
>  	match = of_match_device(tps6594_i2c_of_match_table, dev);
>  	if (!match)
>  		return dev_err_probe(dev, -EINVAL, "Failed to find matching chip ID\n");
> -	tps->chip_id = (unsigned long)match->data;
> +	mdata = (struct tps6594_match_data *)match->data;

What happens when you drop this case?

I was under the impression this was not required when casting from (void *)

> +	tps->chip_id = mdata->chip_id;
> +
> +	tps->regmap = devm_regmap_init(dev, NULL, client, mdata->config);
> +	if (IS_ERR(tps->regmap))
> +		return dev_err_probe(dev, PTR_ERR(tps->regmap), "Failed to init regmap\n");

"initialise"

>  
>  	crc8_populate_msb(tps6594_i2c_crc_table, TPS6594_CRC8_POLYNOMIAL);
>  
> diff --git a/drivers/mfd/tps6594-spi.c b/drivers/mfd/tps6594-spi.c
> index 5afb1736f..82a1c02e3 100644
> --- a/drivers/mfd/tps6594-spi.c
> +++ b/drivers/mfd/tps6594-spi.c
> @@ -77,10 +77,16 @@ static const struct regmap_config tps6594_spi_regmap_config = {
>  	.use_single_write = true,
>  };
>  
> +static const struct tps6594_match_data match_data[] = {
> +	[TPS6594] = {TPS6594, &tps6594_spi_regmap_config},
> +	[TPS6593] = {TPS6593, &tps6594_spi_regmap_config},
> +	[LP8764] = {LP8764, &tps6594_spi_regmap_config},

As above.

> +};
> +
>  static const struct of_device_id tps6594_spi_of_match_table[] = {
> -	{ .compatible = "ti,tps6594-q1", .data = (void *)TPS6594, },
> -	{ .compatible = "ti,tps6593-q1", .data = (void *)TPS6593, },
> -	{ .compatible = "ti,lp8764-q1",  .data = (void *)LP8764,  },
> +	{ .compatible = "ti,tps6594-q1", .data = &match_data[TPS6594], },
> +	{ .compatible = "ti,tps6593-q1", .data = &match_data[TPS6593], },
> +	{ .compatible = "ti,lp8764-q1",  .data = &match_data[LP8764], },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, tps6594_spi_of_match_table);
> @@ -90,6 +96,7 @@ static int tps6594_spi_probe(struct spi_device *spi)
>  	struct device *dev = &spi->dev;
>  	struct tps6594 *tps;
>  	const struct of_device_id *match;
> +	const struct tps6594_match_data *mdata;
>  
>  	tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
>  	if (!tps)
> @@ -101,14 +108,15 @@ static int tps6594_spi_probe(struct spi_device *spi)
>  	tps->reg = spi_get_chipselect(spi, 0);
>  	tps->irq = spi->irq;
>  
> -	tps->regmap = devm_regmap_init(dev, NULL, spi, &tps6594_spi_regmap_config);
> -	if (IS_ERR(tps->regmap))
> -		return dev_err_probe(dev, PTR_ERR(tps->regmap), "Failed to init regmap\n");
> -
>  	match = of_match_device(tps6594_spi_of_match_table, dev);
>  	if (!match)
>  		return dev_err_probe(dev, -EINVAL, "Failed to find matching chip ID\n");
> -	tps->chip_id = (unsigned long)match->data;
> +	mdata = (struct tps6594_match_data *)match->data;
> +	tps->chip_id = mdata->chip_id;
> +
> +	tps->regmap = devm_regmap_init(dev, NULL, spi, mdata->config);
> +	if (IS_ERR(tps->regmap))
> +		return dev_err_probe(dev, PTR_ERR(tps->regmap), "Failed to init regmap\n");
>  
>  	crc8_populate_msb(tps6594_spi_crc_table, TPS6594_CRC8_POLYNOMIAL);
>  
> diff --git a/include/linux/mfd/tps6594.h b/include/linux/mfd/tps6594.h
> index 16543fd4d..d781e0fe3 100644
> --- a/include/linux/mfd/tps6594.h
> +++ b/include/linux/mfd/tps6594.h
> @@ -1337,6 +1337,17 @@ struct tps6594 {
>  	struct regmap_irq_chip_data *irq_data;
>  };
>  
> +/**
> + * struct tps6594_match_data - of match data of PMIC
> + *
> + * @chip_id: chip ID of PMIC
> + * @config: regmap config of PMIC
> + */
> +struct tps6594_match_data {
> +	unsigned long chip_id;
> +	const struct regmap_config *config;
> +};
> +
>  extern const struct regmap_access_table tps6594_volatile_table;
>  extern const struct regmap_access_table tps65224_volatile_table;
>  
> -- 
> 2.25.1
> 

-- 
Lee Jones [李琼斯]