From patchwork Mon Jul 17 06:41:22 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: 13315245 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 C6955C001E0 for ; Mon, 17 Jul 2023 06:42:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229811AbjGQGmb (ORCPT ); Mon, 17 Jul 2023 02:42:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41350 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229765AbjGQGma (ORCPT ); Mon, 17 Jul 2023 02:42:30 -0400 Received: from mta-65-225.siemens.flowmailer.net (mta-65-225.siemens.flowmailer.net [185.136.65.225]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 479A6E79 for ; Sun, 16 Jul 2023 23:42:29 -0700 (PDT) Received: by mta-65-225.siemens.flowmailer.net with ESMTPSA id 20230717064228194a98e60b12c03f45 for ; Mon, 17 Jul 2023 08:42:29 +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=vpfuH8sO5ZXk6LmePDc8wki73sNjAE9XINk/NZwj+Mg=; b=LAgXbKXfDamncftkPbiFGAK48P4YUhH+QFoyihcqFqYTMdrxvBaNq4h0QNKgOaQ7qqiBa6 jCOHOy/p+KKWTRLJyalN/wcbfVXQV4SQy7MQlWmlr59mAmJMTgY5Vrdl7SdNccGnAUGMraiL KyuRqbf3pDC+FNxCfa4LicY77udb4=; 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 v5 1/3] dt-bindings: watchdog: ti,rti-wdt: Add support for WDIOF_CARDRESET Date: Mon, 17 Jul 2023 14:41:22 +0800 Message-Id: <20230717064124.1315746-2-huaqian.li@siemens.com> In-Reply-To: <20230717064124.1315746-1-huaqian.li@siemens.com> References: <20230717064124.1315746-1-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: Guenter Roeck Signed-off-by: Li Hua Qian --- .../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>; + };