linux-kernel - Re: [PATCH 3/4] regulator: sy7636a: add gpios and input regulator

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Message-ID: <20250906143240.GA12656@nxa18884-linux.ap.freescale.net>
Date: Sat, 6 Sep 2025 22:32:40 +0800
From: Peng Fan <peng.fan@....nxp.com>
To: Andreas Kemnade <akemnade@...nel.org>
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Alistair Francis <alistair@...stair23.me>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/4] regulator: sy7636a: add gpios and input regulator

On Sat, Sep 06, 2025 at 11:09:14AM +0200, Andreas Kemnade wrote:
>Initialize input regulator and gpios to proper values to have things
>basically working as well as in the case when these things are
>hardwired.
>
>Signed-off-by: Andreas Kemnade <akemnade@...nel.org>
>---
> drivers/regulator/sy7636a-regulator.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
>diff --git a/drivers/regulator/sy7636a-regulator.c b/drivers/regulator/sy7636a-regulator.c
>index 27e3d939b7bb9..bd8739624c727 100644
>--- a/drivers/regulator/sy7636a-regulator.c
>+++ b/drivers/regulator/sy7636a-regulator.c
>@@ -12,6 +12,7 @@
> #include <linux/mfd/sy7636a.h>
> #include <linux/module.h>
> #include <linux/platform_device.h>
>+#include <linux/regulator/consumer.h>
> #include <linux/regulator/driver.h>
> #include <linux/regulator/machine.h>
> #include <linux/regmap.h>
>@@ -19,6 +20,8 @@
> struct sy7636a_data {
> 	struct regmap *regmap;
> 	struct gpio_desc *pgood_gpio;
>+	struct gpio_desc *en_gpio;
>+	struct gpio_desc *vcom_en_gpio;
> };
> 
> static int sy7636a_get_vcom_voltage_op(struct regulator_dev *rdev)
>@@ -98,6 +101,29 @@ static int sy7636a_regulator_probe(struct platform_device *pdev)
> 	data->regmap = regmap;
> 	data->pgood_gpio = gdp;
> 
>+	ret = devm_regulator_get_enable_optional(&pdev->dev, "vin");
>+	if (ret)
>+		return dev_err_probe(&pdev->dev, ret,
>+				     "failed to get vin regulator\n");
>+
>+	data->en_gpio = devm_gpiod_get_optional(&pdev->dev, "en",
>+						GPIOD_OUT_HIGH);
>+	if (IS_ERR(data->en_gpio))
>+		return dev_err_probe(&pdev->dev,
>+				     PTR_ERR(data->en_gpio),
>+				     "failed to get en gpio\n");
>+
>+	/* Let VCOM just follow the default power on sequence */
>+	data->vcom_en_gpio = devm_gpiod_get_optional(&pdev->dev,
>+						     "vcom-en", GPIOD_OUT_LOW);
>+	if (IS_ERR(data->vcom_en_gpio))
>+		return dev_err_probe(&pdev->dev,
>+				     PTR_ERR(data->en_gpio),
>+				     "failed to get en gpio\n");

Nit: s/en/vcom en/

>+
>+	if (data->en_gpio)
>+		usleep_range(2500, 4000);

It would be better to add a comment on this delay.

Regards
Peng