From patchwork Mon Jul 17 04:07:21 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: 13315175 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 8A0B1EB64DC for ; Mon, 17 Jul 2023 04:08:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230313AbjGQEHw (ORCPT ); Mon, 17 Jul 2023 00:07:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230261AbjGQEHv (ORCPT ); Mon, 17 Jul 2023 00:07:51 -0400 Received: from mta-65-227.siemens.flowmailer.net (mta-65-227.siemens.flowmailer.net [185.136.65.227]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4F7BA107 for ; Sun, 16 Jul 2023 21:07:50 -0700 (PDT) Received: by mta-65-227.siemens.flowmailer.net with ESMTPSA id 20230717040750b3b1d78ff08c3c81a0 for ; Mon, 17 Jul 2023 06:07:50 +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=Nj21lCdl8nb8wOaJjf94cou6OITTnAi/oVfGe4ko348=; b=eoZV0bRPzryisQa4vKAPfKQvEID9x2QvXYRc8XBGVtHruXc7Uq7All8KaSBDcNj+cPpUfn kMA7oQe4XRThHLUOU742XfDWuLRnQfvqeZNrfqCSR74e9oLnlvsnifXl0nrOzY3kwMGA0gED 1FhezfXzv8C962zXJlcKyPKTmnc1A=; 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 , Krzysztof Kozlowski , Conor Dooley , Rob Herring Subject: [PATCH v4 1/3] dt-bindings: watchdog: ti,rti-wdt: Add support for WDIOF_CARDRESET Date: Mon, 17 Jul 2023 12:07:21 +0800 Message-Id: <20230717040723.1306374-2-huaqian.li@siemens.com> In-Reply-To: <20230717040723.1306374-1-huaqian.li@siemens.com> References: <20230717040723.1306374-1-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. Reviewed-by: Krzysztof Kozlowski Reviewed-by: Conor Dooley Reviewed-by: Rob Herring Signed-off-by: Li Hua Qian Reviewed-by: Guenter Roeck --- .../bindings/watchdog/ti,rti-wdt.yaml | 41 +++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml index fc553211e42d..4b66c4fcdf35 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 2. + required: - compatible - reg @@ -59,3 +73,30 @@ examples: assigned-clocks = <&k3_clks 252 1>; assigned-clock-parents = <&k3_clks 252 5>; }; + + - | + // Example 2 (Add reserved memory for watchdog reset cause): + /* + * 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. Add a reserved memory to keep the + * watchdog reset cause persistent, which was be written in 12 bytes + * starting from 0xa2200000 by RTI Watchdog Firmware. + * + * Reserved memory should be defined as follows: + * reserved-memory { + * wdt_reset_memory_region: wdt-memory@a2200000 { + * reg = <0x00 0xa2200000 0x00 0x1000>; + * no-map; + * }; + * } + */ + watchdog@40610000 { + compatible = "ti,j7-rti-wdt"; + reg = <0x40610000 0x100>; + clocks = <&k3_clks 135 1>; + power-domains = <&k3_pds 135 TI_SCI_PD_EXCLUSIVE>; + assigned-clocks = <&k3_clks 135 0>; + assigned-clock-parents = <&k3_clks 135 4>; + memory-region = <&wdt_reset_memory_region>; + };