From patchwork Tue Jul 18 02:10:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Hua Qian" X-Patchwork-Id: 704311 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 650CEC001DE for ; Tue, 18 Jul 2023 02:12:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229481AbjGRCMK (ORCPT ); Mon, 17 Jul 2023 22:12:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41236 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229731AbjGRCMJ (ORCPT ); Mon, 17 Jul 2023 22:12:09 -0400 Received: from mta-64-227.siemens.flowmailer.net (mta-64-227.siemens.flowmailer.net [185.136.64.227]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B6942E6C for ; Mon, 17 Jul 2023 19:12:08 -0700 (PDT) Received: by mta-64-227.siemens.flowmailer.net with ESMTPSA id 202307180212087e89ec9d4e1a3f783b for ; Tue, 18 Jul 2023 04:12:08 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; s=fm1; d=siemens.com; i=huaqian.li@siemens.com; h=Date:From:Subject:To:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:Cc:References:In-Reply-To; bh=vEfG2f2hKFjYPDbtni2Sf1EWNty8c+MQ8mKXu1AGvg4=; b=FbaaJlzbyMrzBrhY5dASym6cN28TZwgAH66Fb22taNFT4Sb4nkLkQI+HVfpPLAwRlH0KMw NUz4W+21tgSLaeyZcq70UKaATlwVEUPkg7UYg5rHJXu30/ftL28AIRcpQB9ZGf/LYqzxhZc0 4f9T5WMIqEv3GVHIernqriojWv6lk=; From: huaqian.li@siemens.com To: wim@linux-watchdog.org, linux@roeck-us.net, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org Cc: huaqianlee@gmail.com, nm@ti.com, vigneshr@ti.com, kristo@kernel.org, linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, jan.kiszka@siemens.com, baocheng.su@siemens.com, Li Hua Qian Subject: [PATCH v6 1/3] dt-bindings: watchdog: ti,rti-wdt: Add support for WDIOF_CARDRESET Date: Tue, 18 Jul 2023 10:10:05 +0800 Message-Id: <20230718021007.1338761-2-huaqian.li@siemens.com> In-Reply-To: <20230718021007.1338761-1-huaqian.li@siemens.com> References: <20230718021007.1338761-1-huaqian.li@siemens.com> MIME-Version: 1.0 X-Flowmailer-Platform: Siemens Feedback-ID: 519:519-959203:519-21489:flowmailer Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org From: Li Hua Qian TI RTI (Real Time Interrupt) Watchdog doesn't support to record the watchdog cause. Add a reserved memory to know the last reboot was caused by the watchdog card. In the reserved memory, some specific info will be saved to indicate whether the watchdog reset was triggered in last boot. Signed-off-by: Li Hua Qian Reviewed-by: Krzysztof Kozlowski Reviewed-by: Guenter Roeck --- .../bindings/watchdog/ti,rti-wdt.yaml | 28 ++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml index fc553211e42d..9d847e4b7278 100644 --- a/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml +++ b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml @@ -34,6 +34,20 @@ properties: power-domains: maxItems: 1 + memory-region: + maxItems: 1 + description: + Contains the watchdog reserved memory. It is optional. + In the reserved memory, the specified values, which are + PON_REASON_SOF_NUM(0xBBBBCCCC), PON_REASON_MAGIC_NUM(0xDDDDDDDD), + and PON_REASON_EOF_NUM(0xCCCCBBBB), are pre-stored at the first + 3 * 4 bytes to tell that last boot was caused by watchdog reset. + Once the PON reason is captured by driver(rti_wdt.c), the driver + is supposed to wipe the whole memory region. Surely, if this + property is set, at least 12 bytes reserved memory starting from + specific memory address(0xa220000) should be set. More please + refer to example. + required: - compatible - reg @@ -47,7 +61,18 @@ examples: /* * RTI WDT in main domain on J721e SoC. Assigned clocks are used to * select the source clock for the watchdog, forcing it to tick with - * a 32kHz clock in this case. + * a 32kHz clock in this case. Add a reserved memory(optional) to keep + * the watchdog reset cause persistent, which was be written in 12 bytes + * starting from 0xa2200000 by RTI Watchdog Firmware, then make it + * possible to get watchdog reset cause in driver. + * + * Reserved memory should be defined as follows: + * reserved-memory { + * wdt_reset_memory_region: wdt-memory@a2200000 { + * reg = <0x00 0xa2200000 0x00 0x1000>; + * no-map; + * }; + * } */ #include @@ -58,4 +83,5 @@ examples: power-domains = <&k3_pds 252 TI_SCI_PD_EXCLUSIVE>; assigned-clocks = <&k3_clks 252 1>; assigned-clock-parents = <&k3_clks 252 5>; + memory-region = <&wdt_reset_memory_region>; };