linux-kernel - Re: [PATCH] watchdog: rn5t618: add support for read out bootstatus

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Date:   Fri, 28 Oct 2022 07:50:28 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Marcus Folkesson <marcus.folkesson@...il.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Lee Jones <lee@...nel.org>
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] watchdog: rn5t618: add support for read out bootstatus

On 10/28/22 00:50, Marcus Folkesson wrote:
> The PMIC does store the power-off factor internally.
> Read it out and report it as bootstatus.
> 
> Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>   drivers/watchdog/rn5t618_wdt.c | 12 ++++++++++++
>   include/linux/mfd/rn5t618.h    |  9 +++++++++
>   2 files changed, 21 insertions(+)
> 
> diff --git a/drivers/watchdog/rn5t618_wdt.c b/drivers/watchdog/rn5t618_wdt.c
> index 6e524c8e26a8..40d8ebd8c0ac 100644
> --- a/drivers/watchdog/rn5t618_wdt.c
> +++ b/drivers/watchdog/rn5t618_wdt.c
> @@ -144,6 +144,8 @@ static int rn5t618_wdt_probe(struct platform_device *pdev)
>   	struct rn5t618 *rn5t618 = dev_get_drvdata(dev->parent);
>   	struct rn5t618_wdt *wdt;
>   	int min_timeout, max_timeout;
> +	int ret;
> +	unsigned int val;
>   
>   	wdt = devm_kzalloc(dev, sizeof(struct rn5t618_wdt), GFP_KERNEL);
>   	if (!wdt)
> @@ -160,6 +162,16 @@ static int rn5t618_wdt_probe(struct platform_device *pdev)
>   	wdt->wdt_dev.timeout = max_timeout;
>   	wdt->wdt_dev.parent = dev;
>   
> +	/* Read out previous power-off factor */
> +	ret = regmap_read(wdt->rn5t618->regmap, RN5T618_POFFHIS, &val);
> +	if (ret)
> +		return ret;
> +
> +	if (val & RN5T618_POFFHIS_VINDET)
> +		wdt->wdt_dev.bootstatus = WDIOF_POWERUNDER;
> +	else if (val & RN5T618_POFFHIS_WDG)
> +		wdt->wdt_dev.bootstatus = WDIOF_CARDRESET;
> +
>   	watchdog_set_drvdata(&wdt->wdt_dev, wdt);
>   	watchdog_init_timeout(&wdt->wdt_dev, timeout, dev);
>   	watchdog_set_nowayout(&wdt->wdt_dev, nowayout);
> diff --git a/include/linux/mfd/rn5t618.h b/include/linux/mfd/rn5t618.h
> index 8aa0bda1af4f..aacb6d51e99c 100644
> --- a/include/linux/mfd/rn5t618.h
> +++ b/include/linux/mfd/rn5t618.h
> @@ -227,6 +227,15 @@
>   #define RN5T618_WATCHDOG_WDOGTIM_S	0
>   #define RN5T618_PWRIRQ_IR_WDOG		BIT(6)
>   
> +#define RN5T618_POFFHIS_PWRON		BIT(0)
> +#define RN5T618_POFFHIS_TSHUT		BIT(1)
> +#define RN5T618_POFFHIS_VINDET		BIT(2)
> +#define RN5T618_POFFHIS_IODET		BIT(3)
> +#define RN5T618_POFFHIS_CPU		BIT(4)
> +#define RN5T618_POFFHIS_WDG		BIT(5)
> +#define RN5T618_POFFHIS_DCLIM		BIT(6)
> +#define RN5T618_POFFHIS_N_OE		BIT(7)
> +
>   enum {
>   	RN5T618_DCDC1,
>   	RN5T618_DCDC2,