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Thu, 02 May 2019 16:08:51 +0200 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id B480146; Thu, 2 May 2019 14:08:50 +0000 (GMT) Received: from Webmail-eu.st.com (Safex1hubcas21.st.com [10.75.90.44]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 8BFA92730; Thu, 2 May 2019 14:08:50 +0000 (GMT) Received: from SAFEX1HUBCAS24.st.com (10.75.90.95) by SAFEX1HUBCAS21.st.com (10.75.90.44) with Microsoft SMTP Server (TLS) id 14.3.361.1; Thu, 2 May 2019 16:08:50 +0200 Received: from lmecxl0923.lme.st.com (10.48.0.237) by webmail-ga.st.com (10.75.90.48) with Microsoft SMTP Server (TLS) id 14.3.439.0; Thu, 2 May 2019 16:08:49 +0200 From: Ludovic Barre To: Wim Van Sebroeck , Guenter Roeck , Rob Herring Subject: [PATCH V2 2/3] watchdog: stm32: update return values recommended by watchdog kernel api Date: Thu, 2 May 2019 16:08:45 +0200 Message-ID: <1556806126-15890-3-git-send-email-ludovic.Barre@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1556806126-15890-1-git-send-email-ludovic.Barre@st.com> References: <1556806126-15890-1-git-send-email-ludovic.Barre@st.com> MIME-Version: 1.0 X-Originating-IP: [10.48.0.237] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-05-02_08:, , signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190502_070900_473701_68946EA4 X-CRM114-Status: GOOD ( 16.17 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Alexandre Torgue , linux-kernel@vger.kernel.org, Ludovic Barre , Maxime Coquelin , linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-watchdog@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Ludovic Barre This patch updates return values on watchdog-kernel-api.txt: return 0 on succes, -EINVAL for "parameter out of range" and -EIO for "could not write value to the watchdog". Signed-off-by: Ludovic Barre --- drivers/watchdog/stm32_iwdg.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-) diff --git a/drivers/watchdog/stm32_iwdg.c b/drivers/watchdog/stm32_iwdg.c index e191bd8..f19a6d4 100644 --- a/drivers/watchdog/stm32_iwdg.c +++ b/drivers/watchdog/stm32_iwdg.c @@ -81,7 +81,6 @@ static int stm32_iwdg_start(struct watchdog_device *wdd) struct stm32_iwdg *wdt = watchdog_get_drvdata(wdd); u32 val = FLAG_PVU | FLAG_RVU; u32 reload; - int ret; dev_dbg(wdd->parent, "%s\n", __func__); @@ -98,13 +97,11 @@ static int stm32_iwdg_start(struct watchdog_device *wdd) reg_write(wdt->regs, IWDG_KR, KR_KEY_ENABLE); /* wait for the registers to be updated (max 100ms) */ - ret = readl_relaxed_poll_timeout(wdt->regs + IWDG_SR, val, - !(val & (FLAG_PVU | FLAG_RVU)), - SLEEP_US, TIMEOUT_US); - if (ret) { - dev_err(wdd->parent, - "Fail to set prescaler or reload registers\n"); - return ret; + if (readl_relaxed_poll_timeout(wdt->regs + IWDG_SR, val, + !(val & (FLAG_PVU | FLAG_RVU)), + SLEEP_US, TIMEOUT_US)) { + dev_err(wdd->parent, "Fail to set prescaler, reload regs\n"); + return -EIO; } /* reload watchdog */ @@ -128,8 +125,16 @@ static int stm32_iwdg_ping(struct watchdog_device *wdd) static int stm32_iwdg_set_timeout(struct watchdog_device *wdd, unsigned int timeout) { + unsigned int tout = clamp(timeout, wdd->min_timeout, + wdd->max_hw_heartbeat_ms / 1000); + dev_dbg(wdd->parent, "%s timeout: %d sec\n", __func__, timeout); + if (tout != timeout) { + dev_err(wdd->parent, "parameter out of range\n"); + return -EINVAL; + } + wdd->timeout = timeout; if (watchdog_active(wdd))