linux-kernel - Re: [PATCH v6 11/12] mfd: bd9571mwv: Make the driver more generic

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Message-ID: <20201223153928.GA681741@dell>
Date:   Wed, 23 Dec 2020 15:39:28 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc:     marek.vasut+renesas@...il.com, matti.vaittinen@...rohmeurope.com,
        lgirdwood@...il.com, broonie@...nel.org, linus.walleij@...aro.org,
        bgolaszewski@...libre.com, khiem.nguyen.xt@...esas.com,
        linux-power@...rohmeurope.com, linux-gpio@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 11/12] mfd: bd9571mwv: Make the driver more generic

On Wed, 23 Dec 2020, Yoshihiro Shimoda wrote:

> From: Khiem Nguyen <khiem.nguyen.xt@...esas.com>
> 
> Since the driver supports BD9571MWV PMIC only, this patch makes
> the functions and data structure become more generic so that
> it can support other PMIC variants as well. Also remove printing
> part name which Lee Jones suggested.
> 
> Signed-off-by: Khiem Nguyen <khiem.nguyen.xt@...esas.com>
> Co-developed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> Reviewed-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> ---
>  drivers/mfd/bd9571mwv.c       | 89 +++++++++++++++++++++++++------------------
>  include/linux/mfd/bd9571mwv.h | 18 +--------
>  2 files changed, 54 insertions(+), 53 deletions(-)

Couple of small points.

Remainder looks good.

> diff --git a/drivers/mfd/bd9571mwv.c b/drivers/mfd/bd9571mwv.c
> index 49e968e..c905ab4 100644
> --- a/drivers/mfd/bd9571mwv.c
> +++ b/drivers/mfd/bd9571mwv.c
> @@ -3,6 +3,7 @@
>   * ROHM BD9571MWV-M MFD driver
>   *
>   * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@...il.com>
> + * Copyright (C) 2020 Renesas Electronics Corporation
>   *
>   * Based on the TPS65086 driver
>   */
> @@ -14,6 +15,14 @@
>  
>  #include <linux/mfd/bd9571mwv.h>
>  
> +/* Driver data to distinguish bd957x variants */
> +struct bd957x_ddata {
> +	const struct regmap_config *regmap_config;
> +	const struct regmap_irq_chip *irq_chip;

> +	const struct mfd_cell *cells;
> +	int num_cells;

Are you using these post-probe?

If not, they're not ddata.

> +};

[...]

>  static int bd9571mwv_probe(struct i2c_client *client,
> -			  const struct i2c_device_id *ids)
> +			   const struct i2c_device_id *ids)
>  {
> -	struct bd9571mwv *bd;
> -	int ret;
> -
> -	bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);
> -	if (!bd)
> -		return -ENOMEM;
> -
> -	i2c_set_clientdata(client, bd);
> -	bd->dev = &client->dev;
> -	bd->irq = client->irq;
> +	const struct bd957x_ddata *ddata;
> +	struct device *dev = &client->dev;
> +	struct regmap *regmap;
> +	struct regmap_irq_chip_data *irq_data;
> +	int ret, irq = client->irq;
> +
> +	/* Read the PMIC product code */
> +	ret = i2c_smbus_read_byte_data(client, BD9571MWV_PRODUCT_CODE);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to read product code\n");
> +		return ret;
> +	}

Nit: '\n' here.

> +	switch (ret) {
> +	case BD9571MWV_PRODUCT_CODE_BD9571MWV:
> +		ddata = &bd9571mwv_ddata;

Simply declare 'const struct mfd_cell *cells' locally in probe and
assign it here instead.

> +		break;
> +	default:
> +		dev_err(dev, "Unsupported device 0x%x\n", ret);
> +		return -ENODEV;
> +	}
>  
> -	bd->regmap = devm_regmap_init_i2c(client, &bd9571mwv_regmap_config);
> -	if (IS_ERR(bd->regmap)) {
> -		dev_err(bd->dev, "Failed to initialize register map\n");
> -		return PTR_ERR(bd->regmap);
> +	regmap = devm_regmap_init_i2c(client, ddata->regmap_config);
> +	if (IS_ERR(regmap)) {
> +		dev_err(dev, "Failed to initialize register map\n");
> +		return PTR_ERR(regmap);
>  	}

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