[PATCH v5,1/2] driver: watchdog: reset watchdog in designware_wdt_stop() function

[Sean Anderson]

On 5/23/21 10:22 PM, Meng.Li at windriver.com wrote:
> From: MengLi <meng.li at windriver.com>
> 
> In uboot command line environment, watchdog is not able to be
> stopped with below commands:
> SOCFPGA_STRATIX10 # wdt dev watchdog at ffd00200
> SOCFPGA_STRATIX10 # wdt stop
> Refer to watchdog driver in linux kernel, it is also need to reset
> watchdog after disable it so that the disable action takes effect.
> 
> Signed-off-by: Meng Li <Meng.Li at windriver.com>
> Reviewed-by: Stefan Roese <sr at denx.de>
> 
> ---
> v5:
> fix build issue, and verify this patch with latest upstream u-boot.
> v4:
> Remove the unauthorized signature.
> v3:
> Add the resets to designware_wdt_priv and initialize it in probe().
> v2:
> Change "#if CONFIG_IS_ENABLED(DM_RESET)" into
> "if (CONFIG_IS_ENABLED(DM_RESET)) {", and define the variable
> into if condition sentence.
> ---
>   drivers/watchdog/designware_wdt.c | 19 +++++++++++++++----
>   1 file changed, 15 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/watchdog/designware_wdt.c b/drivers/watchdog/designware_wdt.c
> index 9e5487168c..afed81e6c6 100644
> --- a/drivers/watchdog/designware_wdt.c
> +++ b/drivers/watchdog/designware_wdt.c
> @@ -22,6 +22,7 @@
>   struct designware_wdt_priv {
>   	void __iomem	*base;
>   	unsigned int	clk_khz;
> +	struct reset_ctl_bulk *resets;
>   };
>   
>   /*
> @@ -95,6 +96,18 @@ static int designware_wdt_stop(struct udevice *dev)
>   	designware_wdt_reset(dev);
>   	writel(0, priv->base + DW_WDT_CR);
>   
> +        if (CONFIG_IS_ENABLED(DM_RESET)) {
> +		int ret;
> +
> +		ret = reset_assert_bulk(priv->resets);
> +		if (ret)
> +			return ret;
> +
> +		ret = reset_deassert_bulk(priv->resets);
> +		if (ret)
> +			return ret;
> +	}
> +
>   	return 0;
>   }
>   
> @@ -143,13 +156,11 @@ static int designware_wdt_probe(struct udevice *dev)
>   #endif
>   
>   	if (CONFIG_IS_ENABLED(DM_RESET)) {
> -		struct reset_ctl_bulk resets;
> -
> -		ret = reset_get_bulk(dev, &resets);
> +		ret = reset_get_bulk(dev, priv->resets);
>   		if (ret)
>   			goto err;
>   
> -		ret = reset_deassert_bulk(&resets);
> +		ret = reset_deassert_bulk(priv->resets);
>   		if (ret)
>   			goto err;
>   	}
> 

Reviewed-by: Sean Anderson <sean.anderson at seco.com>