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Mon, 19 Feb 2024 18:14:25 +0000 (UTC) From: Yang Xiwen via B4 Relay Date: Tue, 20 Feb 2024 02:14:25 +0800 Subject: [PATCH v2 1/2] watchdog: sp805_wdt: deassert the reset if available Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240220-hisi-wdt-v2-1-63edc4965b4c@outlook.com> References: <20240220-hisi-wdt-v2-0-63edc4965b4c@outlook.com> In-Reply-To: <20240220-hisi-wdt-v2-0-63edc4965b4c@outlook.com> To: Wim Van Sebroeck , Guenter Roeck , Philipp Zabel , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Viresh Kumar Cc: linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Yang Xiwen X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=ed25519-sha256; t=1708366465; l=1680; i=forbidden405@outlook.com; s=20230724; h=from:subject:message-id; bh=Ni3PL21dVfacX58NyroZjoZbD5lmIJt2JGNnhuDX6xI=; b=PrBA7WqGLAiZ5soLMgAGUcPHe80L3qvrMa1YCgw+lIjiZRPgunPC/QJ1gC7Uhjf+LEotU467B PvLM+7GxjLJBrZn9tW4NIuMFS0RPOBYdCLLihFM3kfBALus2ZLCjFfr X-Developer-Key: i=forbidden405@outlook.com; a=ed25519; pk=qOD5jhp891/Xzc+H/PZ8LWVSWE3O/XCQnAg+5vdU2IU= X-Endpoint-Received: by B4 Relay for forbidden405@outlook.com/20230724 with auth_id=67 X-Original-From: Yang Xiwen Reply-To: X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1791352148743024021 X-GMAIL-MSGID: 1791352148743024021 From: Yang Xiwen According to the datasheet, the core has an WDOGRESn input signal that needs to be deasserted before being operational. Implement it in the driver. Signed-off-by: Yang Xiwen --- drivers/watchdog/sp805_wdt.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c index 2756ed54ca3d..b4bcfdeb39e6 100644 --- a/drivers/watchdog/sp805_wdt.c +++ b/drivers/watchdog/sp805_wdt.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include #include @@ -59,6 +60,7 @@ * @lock: spin lock protecting dev structure and io access * @base: base address of wdt * @clk: (optional) clock structure of wdt + * @rst: (optional) reset control signal of wdt * @rate: (optional) clock rate when provided via properties * @adev: amba device structure of wdt * @status: current status of wdt @@ -69,6 +71,7 @@ struct sp805_wdt { spinlock_t lock; void __iomem *base; struct clk *clk; + struct reset_control *rst; u64 rate; struct amba_device *adev; unsigned int load_val; @@ -264,6 +267,12 @@ sp805_wdt_probe(struct amba_device *adev, const struct amba_id *id) return -ENODEV; } + wdt->rst = devm_reset_control_get_optional(&adev->dev, NULL); + if (IS_ERR(wdt->rst)) + return dev_err_probe(&adev->dev, PTR_ERR(wdt->rst), "Can not get reset\n"); + + reset_control_deassert(wdt->rst); + wdt->adev = adev; wdt->wdd.info = &wdt_info; wdt->wdd.ops = &wdt_ops; From patchwork Mon Feb 19 18:14:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Xiwen via B4 Relay X-Patchwork-Id: 203203 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:693c:2685:b0:108:e6aa:91d0 with SMTP id mn5csp1458505dyc; Mon, 19 Feb 2024 10:20:44 -0800 (PST) X-Forwarded-Encrypted: i=3; AJvYcCV3lDAi19L8gQc+cbl4dkDQJDzoDd87r/EJpcY2GykPbXO/KvPWc3c2GB0D3KYQZ4TPzaltMoDZXVwqj+GMrK0kGXjJJg== X-Google-Smtp-Source: AGHT+IEego76Zew570n05IG2IfIBkUk6kQsGGYI34SXgFlf6yjFe9ZPMdrR9EtfPxSzIzidCLg7W X-Received: by 2002:a17:902:bb91:b0:1d9:a2d3:8127 with SMTP id m17-20020a170902bb9100b001d9a2d38127mr11549735pls.52.1708366844690; Mon, 19 Feb 2024 10:20:44 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1708366844; cv=pass; d=google.com; s=arc-20160816; b=oGfWzVTizJXKrTVQI6ekXvP/Lqi96Oh9+3Sh9DFZVZPMLTbmp/CPXPvUyVQpLLYFEm N/meOFZh3WkmU+pR41DZkHbLq7Qy14itdseR+VQBwzKtAjchTTDsnbcg+fZX4FSZVKer /cxVYAA8uPNku+Uh3lGJISchQJyN7zXTvYgwWhY89tBNDHzzyZ2ZWC9XM8cC0a+14Xa+ oNkt73jlWlQ0O5t1qiRfaWTmWvSbvms9ev3nrk6ZqzJcwBkirSsDuvYSKeNeSHU9rZrP vuR1Iisrs5rzu2qOxhq7dCLVHtiRReiNtKQaP8jNXBCVWOM/7LlAqdPkupYop2cs0RyT GyqQ== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=reply-to:cc:to:in-reply-to:references:message-id :content-transfer-encoding:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:subject:date:from:dkim-signature; bh=LS0hGU5hNKHi9FpSsuD9KEfZoFAWIkg3eH4IT8p2138=; fh=Lvh7LWueO/Q1oPOPiYL3iQv4DwIsChXRTFT4mXntmHM=; b=V4D/CB/NxvBNIEchpwwbCQCScZRXMCsJ+tBqvMzrQ/qvyMKrVb9mZ3ThFif3A21UIB 5eWV1Ps/0eCr13/DpWvVYarrBuKiL9JJfO/hnvz4M0/Ru4seHepBih2VP3k281uEd/SM MBDB+LyT8yYzR2716esjNuc5mv4fTivhntQBjob6eT7rzlvPU0Gjph7ToGcK9RDi8lHq 8oic5UTX4b5fphQqNq7Crh373Ln1BjEjZwx2vuqoUFgtX1uoCkHmZPlV4rFuXmxfL5+a y7GSTjdMsPzz9E9eb+yseU8vDJ4SVBKwulQCywKfEdKL/OKBYim8g4oJcTNW6G3lcRvA Rw1A==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b="ucmLAF/B"; arc=pass (i=1 dkim=pass dkdomain=kernel.org); spf=pass (google.com: domain of linux-kernel+bounces-71802-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.48.161 as permitted sender) smtp.mailfrom="linux-kernel+bounces-71802-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from sy.mirrors.kernel.org (sy.mirrors.kernel.org. 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Mon, 19 Feb 2024 18:14:25 +0000 (UTC) From: Yang Xiwen via B4 Relay Date: Tue, 20 Feb 2024 02:14:26 +0800 Subject: [PATCH v2 2/2] dt-bindings: watchdog: arm,sp805: document the reset signal Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240220-hisi-wdt-v2-2-63edc4965b4c@outlook.com> References: <20240220-hisi-wdt-v2-0-63edc4965b4c@outlook.com> In-Reply-To: <20240220-hisi-wdt-v2-0-63edc4965b4c@outlook.com> To: Wim Van Sebroeck , Guenter Roeck , Philipp Zabel , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Viresh Kumar Cc: linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Yang Xiwen , Krzysztof Kozlowski X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=ed25519-sha256; t=1708366465; l=1096; i=forbidden405@outlook.com; s=20230724; h=from:subject:message-id; bh=Y/0S+rlwzPt8yQv5SlX93rhiayW10MfuG7cp9vIgSlo=; b=74+vFdustM4jpfDiqXRrX52ettc3+5FsfpFWBdwErZQESubrKlLo/hEYyYhs3NwNvVUwfmAcz mIV0+fgFjDlC5SMtcaITXYcskRk3um5HuiO+azexYWsZq1s2a0oKuNX X-Developer-Key: i=forbidden405@outlook.com; a=ed25519; pk=qOD5jhp891/Xzc+H/PZ8LWVSWE3O/XCQnAg+5vdU2IU= X-Endpoint-Received: by B4 Relay for forbidden405@outlook.com/20230724 with auth_id=67 X-Original-From: Yang Xiwen Reply-To: X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1791352472784205071 X-GMAIL-MSGID: 1791352472784205071 From: Yang Xiwen The reset signal needs to be deasserted before operation of sp805 module. Document in the binding. Reviewed-by: Krzysztof Kozlowski Signed-off-by: Yang Xiwen --- Documentation/devicetree/bindings/watchdog/arm,sp805.yaml | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/watchdog/arm,sp805.yaml b/Documentation/devicetree/bindings/watchdog/arm,sp805.yaml index 7aea255b301b..bd7c09ed1938 100644 --- a/Documentation/devicetree/bindings/watchdog/arm,sp805.yaml +++ b/Documentation/devicetree/bindings/watchdog/arm,sp805.yaml @@ -50,6 +50,10 @@ properties: - const: wdog_clk - const: apb_pclk + resets: + maxItems: 1 + description: WDOGRESn input reset signal for sp805 module. + required: - compatible - reg @@ -67,4 +71,5 @@ examples: interrupts = ; clocks = <&wdt_clk>, <&apb_pclk>; clock-names = "wdog_clk", "apb_pclk"; + resets = <&wdt_rst>; };