linux-kernel - Re: [PATCH 1/2] driver: reset: spacemit-p1: add driver for poweroff/reboot

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Message-ID: <20250928000255-GYA1342640@gentoo.org>
Date: Sun, 28 Sep 2025 08:02:55 +0800
From: Yixun Lan <dlan@...too.org>
To: Aurelien Jarno <aurelien@...el32.net>
Cc: linux-kernel@...r.kernel.org, Lee Jones <lee@...nel.org>,
	Sebastian Reichel <sre@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	"open list:SYSTEM RESET/SHUTDOWN DRIVERS" <linux-pm@...r.kernel.org>,
	"open list:RISC-V SPACEMIT SoC Support" <linux-riscv@...ts.infradead.org>,
	"open list:RISC-V SPACEMIT SoC Support" <spacemit@...ts.linux.dev>
Subject: Re: [PATCH 1/2] driver: reset: spacemit-p1: add driver for
 poweroff/reboot

Hi Aurelien, 

On 00:07 Sun 28 Sep     , Aurelien Jarno wrote:
> This driver implements poweroff/reboot support for the SpacemiT P1 PMIC
> chip, which is commonly paired with the SpacemiT K1 SoC.
> 
> The SpacemiT P1 support is implemented as a MFD driver, so the access is
> done directly through the regmap interface. Reboot or poweroff is
> triggered by setting a specific bit in a control register, which is
> automatically cleared by the hardware afterwards.
> 
> Signed-off-by: Aurelien Jarno <aurelien@...el32.net>
> ---
>  drivers/power/reset/Kconfig              |  9 +++
>  drivers/power/reset/Makefile             |  1 +
>  drivers/power/reset/spacemit-p1-reboot.c | 88 ++++++++++++++++++++++++
>  3 files changed, 98 insertions(+)
>  create mode 100644 drivers/power/reset/spacemit-p1-reboot.c
> 
> diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
> index 77ea3129c7080..5afef049760d6 100644
> --- a/drivers/power/reset/Kconfig
> +++ b/drivers/power/reset/Kconfig
[snip]..
> +
> +static int spacemit_p1_reboot_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct regmap *regmap;
> +	int ret;
> +
> +	regmap = dev_get_regmap(dev->parent, NULL);
> +	if (!regmap)
> +		return -ENODEV;
> +
> +	ret = devm_register_power_off_handler(dev, &spacemit_p1_pwroff_handler, regmap);
> +	if (ret) {
> +		dev_err(dev, "Failed to register power off handler: %d\n", ret);
> +		return ret;
suggest to simplify with dev_err_probe(), which will save few lines
> +	}
> +
> +	ret = devm_register_restart_handler(dev, spacemit_p1_restart_handler, regmap);
> +	if (ret) {
> +		dev_err(dev, "Failed to register restart handler: %d\n", ret);
> +		return ret;
ditto
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct platform_device_id spacemit_p1_reboot_id_table[] = {
> +	{ "spacemit-p1-reboot", },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(platform, spacemit_p1_reboot_id_table);
> +
> +static struct platform_driver spacemit_p1_reboot_driver = {
> +	.driver = {
> +		.name = "spacemit-p1-reboot",
> +	},
> +	.probe = spacemit_p1_reboot_probe,
> +	.id_table = spacemit_p1_reboot_id_table,
> +};
> +module_platform_driver(spacemit_p1_reboot_driver);
> +
> +MODULE_DESCRIPTION("SpacemiT P1 reboot/poweroff driver");
> +MODULE_LICENSE("GPL");
> -- 
> 2.47.2
> 

-- 
Yixun Lan (dlan)