linux-kernel - Re: [PATCH v2] aspeed: watchdog: Set bootstatus during probe

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Date:   Tue, 27 Mar 2018 14:04:06 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Eddie James <eajames@...ux.vnet.ibm.com>,
        linux-watchdog@...r.kernel.org
Cc:     openbmc@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        wim@...ux-watchdog.org, joel@....id.au
Subject: Re: [PATCH v2] aspeed: watchdog: Set bootstatus during probe

On 03/27/2018 01:09 PM, Eddie James wrote:
> Check the aspeed timeout status register to see if the system has booted
> from the secondary boot source. If so, set the watchdog device
> bootstatus flag for "Card previously reset the CPU."
> 
> Signed-off-by: Eddie James <eajames@...ux.vnet.ibm.com>

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

> ---
> Changes since v1:
>   - use bootstatus instead of status
>   - use WDIOF_CARDRESET instead of raw register contents
> 
>   drivers/watchdog/aspeed_wdt.c | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
> index a5b8eb2..1abe4d0 100644
> --- a/drivers/watchdog/aspeed_wdt.c
> +++ b/drivers/watchdog/aspeed_wdt.c
> @@ -55,6 +55,8 @@ struct aspeed_wdt_config {
>   #define   WDT_CTRL_WDT_INTR		BIT(2)
>   #define   WDT_CTRL_RESET_SYSTEM		BIT(1)
>   #define   WDT_CTRL_ENABLE		BIT(0)
> +#define WDT_TIMEOUT_STATUS	0x10
> +#define   WDT_TIMEOUT_STATUS_BOOT_SECONDARY	BIT(1)
>   
>   /*
>    * WDT_RESET_WIDTH controls the characteristics of the external pulse (if
> @@ -192,6 +194,7 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
>   	struct device_node *np;
>   	const char *reset_type;
>   	u32 duration;
> +	u32 status;
>   	int ret;
>   
>   	wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
> @@ -307,6 +310,10 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
>   		writel(duration - 1, wdt->base + WDT_RESET_WIDTH);
>   	}
>   
> +	status = readl(wdt->base + WDT_TIMEOUT_STATUS);
> +	if (status & WDT_TIMEOUT_STATUS_BOOT_SECONDARY)
> +		wdt->wdd.bootstatus = WDIOF_CARDRESET;
> +
>   	ret = devm_watchdog_register_device(&pdev->dev, &wdt->wdd);
>   	if (ret) {
>   		dev_err(&pdev->dev, "failed to register\n");
>