Re: [PATCH 15/21] regulator: tps65090: Pass descriptor instead of GPIO number

[Lee Jones <lee.jones@linaro.org>]

On Mon, 12 Feb 2018, Linus Walleij wrote:

> Instead of passing a global GPIO number for the enable GPIO, pass
> a descriptor looked up from the device tree node for the
> regulator.
> 
> This regulator supports passing platform data, but enable/sleep
> regulators are looked up from the device tree exclusively, so
> we can need not touch other files.
> 
> Cc: Lee Jones <lee.jones@linaro.org>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
> Lee: it would be nice if you could ACK this smallish patch to
> the MFD header.

Fine, but any sign of a conflict and I'll need a PR.

Acked-by: Lee Jones <lee.jones@linaro.org>

> ---
>  drivers/regulator/tps65090-regulator.c | 50 ++++++++++++++++------------------
>  include/linux/mfd/tps65090.h           |  8 ++++--
>  2 files changed, 28 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/regulator/tps65090-regulator.c b/drivers/regulator/tps65090-regulator.c
> index 395f35dc8cdb..2d398fa3b720 100644
> --- a/drivers/regulator/tps65090-regulator.c
> +++ b/drivers/regulator/tps65090-regulator.c
> @@ -19,8 +19,8 @@
>  #include <linux/module.h>
>  #include <linux/delay.h>
>  #include <linux/init.h>
> -#include <linux/gpio.h>
> -#include <linux/of_gpio.h>
> +#include <linux/of.h>
> +#include <linux/gpio/consumer.h>
>  #include <linux/slab.h>
>  #include <linux/err.h>
>  #include <linux/platform_device.h>
> @@ -300,26 +300,6 @@ static int tps65090_regulator_disable_ext_control(
>  	return tps65090_config_ext_control(ri, false);
>  }
>  
> -static void tps65090_configure_regulator_config(
> -		struct tps65090_regulator_plat_data *tps_pdata,
> -		struct regulator_config *config)
> -{
> -	if (gpio_is_valid(tps_pdata->gpio)) {
> -		int gpio_flag = GPIOF_OUT_INIT_LOW;
> -
> -		if (tps_pdata->reg_init_data->constraints.always_on ||
> -				tps_pdata->reg_init_data->constraints.boot_on)
> -			gpio_flag = GPIOF_OUT_INIT_HIGH;
> -
> -		config->ena_gpio = tps_pdata->gpio;
> -		config->ena_gpio_initialized = true;
> -		config->ena_gpio_flags = gpio_flag;
> -	} else {
> -		config->ena_gpio = -EINVAL;
> -		config->ena_gpio_initialized = false;
> -	}
> -}
> -
>  #ifdef CONFIG_OF
>  static struct of_regulator_match tps65090_matches[] = {
>  	{ .name = "dcdc1", },
> @@ -385,9 +365,26 @@ static struct tps65090_platform_data *tps65090_parse_dt_reg_data(
>  		rpdata->enable_ext_control = of_property_read_bool(
>  					tps65090_matches[idx].of_node,
>  					"ti,enable-ext-control");
> -		if (rpdata->enable_ext_control)
> -			rpdata->gpio = of_get_named_gpio(np,
> -					"dcdc-ext-control-gpios", 0);
> +		if (rpdata->enable_ext_control) {
> +			enum gpiod_flags gflags;
> +
> +			if (ri_data->constraints.always_on ||
> +			    ri_data->constraints.boot_on)
> +				gflags = GPIOD_OUT_HIGH;
> +			else
> +				gflags = GPIOD_OUT_LOW;
> +
> +			rpdata->gpiod = devm_gpiod_get_from_of_node(&pdev->dev,
> +								    tps65090_matches[idx].of_node,
> +								    "dcdc-ext-control-gpios", 0,
> +								    gflags,
> +								    "tps65090");
> +			if (IS_ERR(rpdata->gpiod))
> +				return ERR_CAST(rpdata->gpiod);
> +			if (!rpdata->gpiod)
> +				dev_err(&pdev->dev,
> +					"could not find DCDC external control GPIO\n");
> +		}
>  
>  		if (of_property_read_u32(tps65090_matches[idx].of_node,
>  					 "ti,overcurrent-wait",
> @@ -455,8 +452,7 @@ static int tps65090_regulator_probe(struct platform_device *pdev)
>  		 */
>  		if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
>  			if (tps_pdata->enable_ext_control) {
> -				tps65090_configure_regulator_config(
> -						tps_pdata, &config);
> +				config.ena_gpiod = tps_pdata->gpiod;
>  				ri->desc->ops = &tps65090_ext_control_ops;
>  			} else {
>  				ret = tps65090_regulator_disable_ext_control(
> diff --git a/include/linux/mfd/tps65090.h b/include/linux/mfd/tps65090.h
> index 67d144b3b8f9..f05bf4a146e2 100644
> --- a/include/linux/mfd/tps65090.h
> +++ b/include/linux/mfd/tps65090.h
> @@ -83,6 +83,8 @@ enum {
>  #define TPS65090_MAX_REG	TPS65090_REG_AD_OUT2
>  #define TPS65090_NUM_REGS	(TPS65090_MAX_REG + 1)
>  
> +struct gpio_desc;
> +
>  struct tps65090 {
>  	struct device		*dev;
>  	struct regmap		*rmap;
> @@ -95,8 +97,8 @@ struct tps65090 {
>   * @reg_init_data: The regulator init data.
>   * @enable_ext_control: Enable extrenal control or not. Only available for
>   *     DCDC1, DCDC2 and DCDC3.
> - * @gpio: Gpio number if external control is enabled and controlled through
> - *     gpio.
> + * @gpiod: Gpio descriptor if external control is enabled and controlled through
> + *     gpio
>   * @overcurrent_wait_valid: True if the overcurrent_wait should be applied.
>   * @overcurrent_wait: Value to set as the overcurrent wait time.  This is the
>   *     actual bitfield value, not a time in ms (valid value are 0 - 3).
> @@ -104,7 +106,7 @@ struct tps65090 {
>  struct tps65090_regulator_plat_data {
>  	struct regulator_init_data *reg_init_data;
>  	bool enable_ext_control;
> -	int gpio;
> +	struct gpio_desc *gpiod;
>  	bool overcurrent_wait_valid;
>  	int overcurrent_wait;
>  };

-- 
Lee Jones
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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