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Date: Mon, 12 Feb 2018 14:58:33 +0000
From: Lee Jones <lee.jones@...aro.org>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
linux-gpio@...r.kernel.org
Subject: Re: [PATCH 15/21] regulator: tps65090: Pass descriptor instead of
GPIO number
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@...aro.org>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.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@...aro.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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