[PATCH 2/2] watchdog: aspeed: Add support for aspeed,reset-mask DT property

[Guenter Roeck <linux@roeck-us.net>]

On 9/22/23 03:42, Zev Weiss wrote:
> This property allows the device-tree to specify how the Aspeed
> watchdog timer's reset mask register(s) should be set, so that
> peripherals can be individually exempted from (or opted in to) being
> reset when the watchdog timer expires.
> 
> Signed-off-by: Zev Weiss <zev@bewilderbeest.net>

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

> ---
>   drivers/watchdog/aspeed_wdt.c | 11 +++++++++++
>   1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
> index b72a858bbac7..b4773a6aaf8c 100644
> --- a/drivers/watchdog/aspeed_wdt.c
> +++ b/drivers/watchdog/aspeed_wdt.c
> @@ -79,6 +79,8 @@ MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table);
>   #define   WDT_TIMEOUT_STATUS_BOOT_SECONDARY	BIT(1)
>   #define WDT_CLEAR_TIMEOUT_STATUS	0x14
>   #define   WDT_CLEAR_TIMEOUT_AND_BOOT_CODE_SELECTION	BIT(0)
> +#define WDT_RESET_MASK1		0x1c
> +#define WDT_RESET_MASK2		0x20
>   
>   /*
>    * WDT_RESET_WIDTH controls the characteristics of the external pulse (if
> @@ -402,6 +404,8 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
>   
>   	if ((of_device_is_compatible(np, "aspeed,ast2500-wdt")) ||
>   		(of_device_is_compatible(np, "aspeed,ast2600-wdt"))) {
> +		u32 reset_mask[2];
> +		size_t nrstmask = of_device_is_compatible(np, "aspeed,ast2600-wdt") ? 2 : 1;
>   		u32 reg = readl(wdt->base + WDT_RESET_WIDTH);
>   
>   		reg &= wdt->cfg->ext_pulse_width_mask;
> @@ -419,6 +423,13 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
>   			reg |= WDT_OPEN_DRAIN_MAGIC;
>   
>   		writel(reg, wdt->base + WDT_RESET_WIDTH);
> +
> +		ret = of_property_read_u32_array(np, "aspeed,reset-mask", reset_mask, nrstmask);
> +		if (!ret) {
> +			writel(reset_mask[0], wdt->base + WDT_RESET_MASK1);
> +			if (nrstmask > 1)
> +				writel(reset_mask[1], wdt->base + WDT_RESET_MASK2);
> +		}
>   	}
>   
>   	if (!of_property_read_u32(np, "aspeed,ext-pulse-duration", &duration)) {