On Tue, Mar 20, 2018 at 10:36:26PM +0100, Wolfram Sang wrote:
> From: Veeraiyan Chidambaram <veeraiyan.chidambaram@xxxxxxxxxxxx>
>
> This patch adds the WDIOF_CARDRESET support for the Renessas platform
> watchdog, to know if the board reboot is due to a watchdog reset.
>
> This is done via the WOVF bit (bit 4) of the RWTCSRA register, which
> indicates if RWTCNT overflowed, triggering the reset in last boot.
>
> Signed-off-by: Veeraiyan Chidambaram <veeraiyan.chidambaram@xxxxxxxxxxxx>
> [takeshi.kihara.df: changed to read the RWTCSRA register while clock is
> enabled]
> Signed-off-by: Takeshi Kihara <takeshi.kihara.df@xxxxxxxxxxx>
> Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Guenetr Roeck <linux@xxxxxxxxxxxx>
> ---
> drivers/watchdog/renesas_wdt.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
> index 6b8c6ddfe30b31..514db5cc159511 100644
> --- a/drivers/watchdog/renesas_wdt.c
> +++ b/drivers/watchdog/renesas_wdt.c
> @@ -121,7 +121,8 @@ static int rwdt_restart(struct watchdog_device *wdev, unsigned long action,
> }
>
> static const struct watchdog_info rwdt_ident = {
> - .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
> + .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
> + WDIOF_CARDRESET,
> .identity = "Renesas WDT Watchdog",
> };
>
> @@ -197,9 +198,10 @@ static int rwdt_probe(struct platform_device *pdev)
> return PTR_ERR(clk);
>
> pm_runtime_enable(&pdev->dev);
> -
> pm_runtime_get_sync(&pdev->dev);
> priv->clk_rate = clk_get_rate(clk);
> + priv->wdev.bootstatus = (readb_relaxed(priv->base + RWTCSRA) &
> + RWTCSRA_WOVF) ? WDIOF_CARDRESET : 0;
> pm_runtime_put(&pdev->dev);
>
> if (!priv->clk_rate) {
> --
> 2.11.0
>
> --
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