linux-kernel - Re: [PATCH v3 2/2] regulator: richtek,rt4801: parse GPIOs per regulator

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Date:   Mon, 25 Apr 2022 15:58:17 +0800
From:   ChiYuan Huang <u0084500@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        ChiYuan Huang <cy_huang@...htek.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 2/2] regulator: richtek,rt4801: parse GPIOs per
 regulator

On Mon, Apr 25, 2022 at 09:24:55AM +0200, Krzysztof Kozlowski wrote:
> Having one enable-gpios property for all regulators is discouraged and
> instead, similarly to regulator core ena_gpiod feature, each GPIO should
> be present in each regulator node.  Add support for parsing such GPIOs,
> keeping backwards compatibility.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
>  drivers/regulator/rt4801-regulator.c | 49 +++++++++++++++++++++-------
>  1 file changed, 38 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/regulator/rt4801-regulator.c b/drivers/regulator/rt4801-regulator.c
> index 7a87788d3f09..563d79196fdd 100644
> --- a/drivers/regulator/rt4801-regulator.c
> +++ b/drivers/regulator/rt4801-regulator.c
> @@ -29,11 +29,33 @@
>  
>  struct rt4801_priv {
>  	struct device *dev;
> -	struct gpio_descs *enable_gpios;
> +	struct gpio_desc *enable_gpios[DSV_OUT_MAX];
>  	unsigned int enable_flag;
>  	unsigned int volt_sel[DSV_OUT_MAX];
>  };
>  
> +static int rt4801_of_parse_cb(struct device_node *np,
> +			      const struct regulator_desc *desc,
> +			      struct regulator_config *config)
> +{
> +	struct rt4801_priv *priv = config->driver_data;
> +	int id = desc->id;
> +
> +	if (priv->enable_gpios[id]) {
> +		dev_warn(priv->dev, "duplicated enable-gpios property\n");
> +		return 0;
> +	}
> +	priv->enable_gpios[id] = devm_fwnode_gpiod_get_index(priv->dev,
> +							     of_fwnode_handle(np),
> +							     "enable", 0,
> +							     GPIOD_OUT_HIGH,
> +							     "rt4801");
> +	if (IS_ERR(priv->enable_gpios[id]))
> +		priv->enable_gpios[id] = NULL;
> +
> +	return 0;
> +}
> +
>  static int rt4801_set_voltage_sel(struct regulator_dev *rdev, unsigned int selector)
>  {
>  	struct rt4801_priv *priv = rdev_get_drvdata(rdev);
> @@ -63,15 +85,14 @@ static int rt4801_get_voltage_sel(struct regulator_dev *rdev)
>  static int rt4801_enable(struct regulator_dev *rdev)
>  {
>  	struct rt4801_priv *priv = rdev_get_drvdata(rdev);
> -	struct gpio_descs *gpios = priv->enable_gpios;
>  	int id = rdev_get_id(rdev), ret;
>  
> -	if (!gpios || gpios->ndescs <= id) {
> +	if (!priv->enable_gpios[id]) {
>  		dev_warn(&rdev->dev, "no dedicated gpio can control\n");
>  		goto bypass_gpio;
>  	}
>  
> -	gpiod_set_value(gpios->desc[id], 1);
> +	gpiod_set_value(priv->enable_gpios[id], 1);
>  
>  bypass_gpio:
>  	ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, priv->volt_sel[id]);
> @@ -85,15 +106,14 @@ static int rt4801_enable(struct regulator_dev *rdev)
>  static int rt4801_disable(struct regulator_dev *rdev)
>  {
>  	struct rt4801_priv *priv = rdev_get_drvdata(rdev);
> -	struct gpio_descs *gpios = priv->enable_gpios;
>  	int id = rdev_get_id(rdev);
>  
> -	if (!gpios || gpios->ndescs <= id) {
> +	if (!priv->enable_gpios[id]) {
>  		dev_warn(&rdev->dev, "no dedicated gpio can control\n");
>  		goto bypass_gpio;
>  	}
>  
> -	gpiod_set_value(gpios->desc[id], 0);
> +	gpiod_set_value(priv->enable_gpios[id], 0);
>  
>  bypass_gpio:
>  	priv->enable_flag &= ~BIT(id);
> @@ -122,6 +142,7 @@ static const struct regulator_desc rt4801_regulator_descs[] = {
>  		.name = "DSVP",
>  		.ops = &rt4801_regulator_ops,
>  		.of_match = of_match_ptr("DSVP"),
> +		.of_parse_cb = rt4801_of_parse_cb,
>  		.type = REGULATOR_VOLTAGE,
>  		.id = DSV_OUT_POS,
>  		.min_uV = MIN_UV,
> @@ -135,6 +156,7 @@ static const struct regulator_desc rt4801_regulator_descs[] = {
>  		.name = "DSVN",
>  		.ops = &rt4801_regulator_ops,
>  		.of_match = of_match_ptr("DSVN"),
> +		.of_parse_cb = rt4801_of_parse_cb,
>  		.type = REGULATOR_VOLTAGE,
>  		.id = DSV_OUT_NEG,
>  		.min_uV = MIN_UV,
> @@ -172,10 +194,15 @@ static int rt4801_probe(struct i2c_client *i2c)
>  		return PTR_ERR(regmap);
>  	}
>  
> -	priv->enable_gpios = devm_gpiod_get_array_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH);
> -	if (IS_ERR(priv->enable_gpios)) {
> -		dev_err(&i2c->dev, "Failed to get gpios\n");
> -		return PTR_ERR(priv->enable_gpios);
> +	for (i = 0; i < DSV_OUT_MAX; i++) {
> +		priv->enable_gpios[i] = devm_gpiod_get_index_optional(&i2c->dev,
> +								      "enable",
> +								      i,
> +								      GPIOD_OUT_HIGH);
> +		if (IS_ERR(priv->enable_gpios[i])) {
> +			dev_err(&i2c->dev, "Failed to get gpios\n");
> +			return PTR_ERR(priv->enable_gpios[i]);
> +		}
>  	}
You can directly removed all about 'enable-gpios' in probe phase.
Just keep of_parse_cb to get per regulator 'enable' gpio. 

The others looks fine.

Best regards,
ChiYuan Huang.
>  
>  	for (i = 0; i < DSV_OUT_MAX; i++) {
> -- 
> 2.32.0
>