From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sauhun.de ([88.99.104.3]:52671 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751481AbeCTVgo (ORCPT ); Tue, 20 Mar 2018 17:36:44 -0400 From: Wolfram Sang To: linux-watchdog@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, Fabrizio Castro , Veeraiyan Chidambaram , Takeshi Kihara , Wolfram Sang Subject: [PATCH] watchdog: renesas-wdt: Add support for WDIOF_CARDRESET Date: Tue, 20 Mar 2018 22:36:26 +0100 Message-Id: <20180320213626.14208-1-wsa+renesas@sang-engineering.com> Sender: linux-watchdog-owner@vger.kernel.org List-Id: linux-watchdog@vger.kernel.org From: Veeraiyan Chidambaram 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 [takeshi.kihara.df: changed to read the RWTCSRA register while clock is enabled] Signed-off-by: Takeshi Kihara Signed-off-by: Wolfram Sang --- 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