[PATCH] i.MX/WD: setup the watchdog according to its datasheet

[Sascha Hauer]

On Wed, Jun 07, 2017 at 12:45:42PM +0200, Juergen Borleis wrote:
> From earlier SoCs like the i.MX21 up to i.MX7 their datasheets states
> after reset the watchdog timer has to be set first prior enabling the
> watchdog itself. This change do it this way.
> 
> Signed-off-by: Juergen Borleis <jbe at pengutronix.de>
> ---
>  drivers/watchdog/imxwd.c | 6 ++++++
>  1 file changed, 6 insertions(+)

Applied, thanks

Sascha

> 
> diff --git a/drivers/watchdog/imxwd.c b/drivers/watchdog/imxwd.c
> index b920c7234..5cc178f3e 100644
> --- a/drivers/watchdog/imxwd.c
> +++ b/drivers/watchdog/imxwd.c
> @@ -114,6 +114,12 @@ static int imx21_watchdog_set_timeout(struct imx_wd *priv, unsigned timeout)
>  	if (priv->ext_reset)
>  		val |= IMX21_WDOG_WCR_WDT;
>  
> +	/*
> +	 * set time and some write once bits first prior enabling the
> +	 * watchdog according to the datasheet
> +	 */
> +	writew(val, priv->base + IMX21_WDOG_WCR);
> +
>  	writew(IMX21_WDOG_WCR_WDE | val, priv->base + IMX21_WDOG_WCR);
>  
>  	/* Write Service Sequence */
> -- 
> 2.11.0
> 
> 
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