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Date:   Wed, 16 Dec 2020 08:25:22 +0000
From:   "Vaittinen, Matti" <Matti.Vaittinen@...rohmeurope.com>
To:     "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "marek.vasut+renesas@...il.com" <marek.vasut+renesas@...il.com>,
        "yoshihiro.shimoda.uh@...esas.com" <yoshihiro.shimoda.uh@...esas.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "bgolaszewski@...libre.com" <bgolaszewski@...libre.com>,
        "lee.jones@...aro.org" <lee.jones@...aro.org>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>
CC:     linux-power <linux-power@...rohmeurope.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "khiem.nguyen.xt@...esas.com" <khiem.nguyen.xt@...esas.com>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 11/12] mfd: bd9571mwv: Make the driver more generic


On Wed, 2020-12-16 at 16:37 +0900, 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.
> 
> Signed-off-by: Khiem Nguyen <khiem.nguyen.xt@...esas.com>
> [shimoda: rebase and refactor]
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>

Reviewed-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>

> ---
>  drivers/mfd/bd9571mwv.c       | 95 +++++++++++++++++++++++++++----
> ------------
>  include/linux/mfd/bd9571mwv.h | 18 ++------
>  2 files changed, 63 insertions(+), 50 deletions(-)
> 
> diff --git a/drivers/mfd/bd9571mwv.c b/drivers/mfd/bd9571mwv.c
> index 49e968e..ccf1a60 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 +15,19 @@
>  
>  #include <linux/mfd/bd9571mwv.h>
>  
> +/**
> + * struct bd957x_data - internal data for the bd957x driver
> + *
> + * Internal data to distinguish bd957x variants
> + */
> +struct bd957x_data {
> +	char *part_name;
> +	const struct regmap_config *regmap_config;
> +	const struct regmap_irq_chip *irq_chip;
> +	const struct mfd_cell *cells;
> +	int num_cells;
> +};
> +

I do like the way you placed the variant data in owns structs. Well
thought.

>  static const struct mfd_cell bd9571mwv_cells[] = {
>  	{ .name = "bd9571mwv-regulator", },
>  	{ .name = "bd9571mwv-gpio", },
> @@ -102,13 +116,21 @@ static struct regmap_irq_chip
> bd9571mwv_irq_chip = {
>  	.num_irqs	= ARRAY_SIZE(bd9571mwv_irqs),
>  };
>  
> -static int bd9571mwv_identify(struct bd9571mwv *bd)
> +static const struct bd957x_data bd9571mwv_data = {
> +	.part_name = BD9571MWV_PART_NAME,
> +	.regmap_config = &bd9571mwv_regmap_config,
> +	.irq_chip = &bd9571mwv_irq_chip,
> +	.cells = bd9571mwv_cells,
> +	.num_cells = ARRAY_SIZE(bd9571mwv_cells),
> +};
> +
> +static int bd9571mwv_identify(struct device *dev, struct regmap
> *regmap,
> +			      const char *part_name)
>  {
> -	struct device *dev = bd->dev;
>  	unsigned int value;
>  	int ret;
>  
> -	ret = regmap_read(bd->regmap, BD9571MWV_VENDOR_CODE, &value);
> +	ret = regmap_read(regmap, BD9571MWV_VENDOR_CODE, &value);
>  	if (ret) {
>  		dev_err(dev, "Failed to read vendor code register
> (ret=%i)\n",
>  			ret);
> @@ -121,27 +143,20 @@ static int bd9571mwv_identify(struct bd9571mwv
> *bd)
>  		return -EINVAL;
>  	}
>  
> -	ret = regmap_read(bd->regmap, BD9571MWV_PRODUCT_CODE, &value);
> +	ret = regmap_read(regmap, BD9571MWV_PRODUCT_CODE, &value);
>  	if (ret) {
>  		dev_err(dev, "Failed to read product code register
> (ret=%i)\n",
>  			ret);
>  		return ret;
>  	}
> -
> -	if (value != BD9571MWV_PRODUCT_CODE_VAL) {
> -		dev_err(dev, "Invalid product code ID %02x (expected
> %02x)\n",
> -			value, BD9571MWV_PRODUCT_CODE_VAL);
> -		return -EINVAL;
> -	}
> -
> -	ret = regmap_read(bd->regmap, BD9571MWV_PRODUCT_REVISION,
> &value);
> +	ret = regmap_read(regmap, BD9571MWV_PRODUCT_REVISION, &value);
>  	if (ret) {
>  		dev_err(dev, "Failed to read revision register
> (ret=%i)\n",
>  			ret);
>  		return ret;
>  	}
>  
> -	dev_info(dev, "Device: BD9571MWV rev. %d\n", value & 0xff);
> +	dev_info(dev, "Device: %s rev. %d\n", part_name, value & 0xff);
>  
>  	return 0;
>  }
> @@ -149,38 +164,48 @@ static int bd9571mwv_identify(struct bd9571mwv
> *bd)
>  static int bd9571mwv_probe(struct i2c_client *client,
>  			  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_data *data;
> +	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);

Having to use the i2c_smbus_read_byte_data for a device which is going
to be used with regmap slightly bugs me. But as you want to do the
runtime probing, then this access must be done prior regmap
registration - so I can't think of a better way. :(

> +	if (ret < 0) {
> +		dev_err(dev, "failed reading at 0x%02x\n",
> +			BD9571MWV_PRODUCT_CODE);
> +		return ret;
> +	}
> +	switch (ret) {
> +	case BD9571MWV_PRODUCT_CODE_VAL:
> +		data = &bd9571mwv_data;
> +		break;
> +	default:
> +		dev_err(dev, "Unsupported device 0x%x\n", ret);
> +		return -ENOENT;
> +	}
>  
> -	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, data->regmap_config);
> +	if (IS_ERR(regmap)) {
> +		dev_err(dev, "Failed to initialize register map\n");
> +		return PTR_ERR(regmap);
>  	}
>  
> -	ret = bd9571mwv_identify(bd);
> +	ret = bd9571mwv_identify(dev, regmap, data->part_name);
>  	if (ret)
>  		return ret;
>  
> -	ret = devm_regmap_add_irq_chip(bd->dev, bd->regmap, bd->irq,
> -				       IRQF_ONESHOT, 0,
> &bd9571mwv_irq_chip,
> -				       &bd->irq_data);
> +	ret = devm_regmap_add_irq_chip(dev, regmap, irq, IRQF_ONESHOT,
> 0,
> +				       data->irq_chip, &irq_data);
>  	if (ret) {
> -		dev_err(bd->dev, "Failed to register IRQ chip\n");
> +		dev_err(dev, "Failed to register IRQ chip\n");
>  		return ret;
>  	}
>  
> -	return devm_mfd_add_devices(bd->dev, PLATFORM_DEVID_AUTO,
> -				    bd9571mwv_cells,
> ARRAY_SIZE(bd9571mwv_cells),
> -				    NULL, 0, regmap_irq_get_domain(bd-
> >irq_data));
> +	return devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, data-
> >cells,
> +				    data->num_cells, NULL, 0,
> +				    regmap_irq_get_domain(irq_data));
>  }
>  
>  static const struct of_device_id bd9571mwv_of_match_table[] = {
> diff --git a/include/linux/mfd/bd9571mwv.h
> b/include/linux/mfd/bd9571mwv.h
> index bcc7092..5ab976a 100644
> --- a/include/linux/mfd/bd9571mwv.h
> +++ b/include/linux/mfd/bd9571mwv.h
> @@ -3,6 +3,7 @@
>   * ROHM BD9571MWV-M driver
>   *
>   * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@...il.com>
> + * Copyright (C) 2020 Renesas Electronics Corporation
>   *
>   * Based on the TPS65086 driver
>   */
> @@ -83,6 +84,8 @@
>  
>  #define BD9571MWV_ACCESS_KEY			0xff
>  
> +#define BD9571MWV_PART_NAME			"BD9571MWV"
> +
>  /* Define the BD9571MWV IRQ numbers */
>  enum bd9571mwv_irqs {
>  	BD9571MWV_IRQ_MD1,
> @@ -94,19 +97,4 @@ enum bd9571mwv_irqs {
>  	BD9571MWV_IRQ_WDT_OF,
>  	BD9571MWV_IRQ_BKUP_TRG,
>  };
> -
> -/**
> - * struct bd9571mwv - state holder for the bd9571mwv driver
> - *
> - * Device data may be used to access the BD9571MWV chip
> - */
> -struct bd9571mwv {
> -	struct device *dev;
> -	struct regmap *regmap;
> -
> -	/* IRQ Data */
> -	int irq;
> -	struct regmap_irq_chip_data *irq_data;
> -};
> -
>  #endif /* __LINUX_MFD_BD9571MWV_H */

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