From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2B613C87FCC for ; Thu, 31 Jul 2025 09:53:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=QwxHrTbydqwM7d6UzbsfH9IioeyAzaZVSGDspK8v8KU=; b=grmd0cym2zqOOj+aW0t1V6UNod YsrdyridLFVjeIMpmXaRme/G+cpxCkeG6x6hMakDRv8EyP/fNjiatv4jKh2zTWetS9Ibayq98nJDa WTA4qu+UQZHXPpnKzrNBoy4pXUAVzlOULDznLTnm5L6LW94ixQEUREgo5WExh4VxaWB1b4qhi2Vh1 5K73LLwmIQVyFFn3mE8tmy8deGqDYDgLcacOA1dPsyK+hHMdrmFIJmenJ2X94c3lN/tuXnCpITVoR gKhGoa6faCBhyEPSBuzauShE0oFCX5xZ6ZtDV2ULZJ4+aLu1SEl0F7X3GEWB1x8YI5wl1SNsetbuJ buokiAGA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uhPy8-00000003JlN-38ni; Thu, 31 Jul 2025 09:53:00 +0000 Received: from relay2-d.mail.gandi.net ([217.70.183.194]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uhPvU-00000003JY9-3dyb for linux-arm-kernel@lists.infradead.org; Thu, 31 Jul 2025 09:50:19 +0000 Received: by mail.gandi.net (Postfix) with ESMTPSA id A3863430B7; Thu, 31 Jul 2025 09:50:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1753955414; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=QwxHrTbydqwM7d6UzbsfH9IioeyAzaZVSGDspK8v8KU=; b=g7ZtkIhLgsNC+D4XgALuZ5CW3tBZUXYeWZXXR+qzBSasztnToKOUfX66nnk8tgmhcwnjuh M0x/a0uMor5V8J7X9yyizXDwtzGl4vGqKL/FFfu4vLdI7rBedAurrSWrHmA4koMnITfHGy MveGPV4yjge5QY1al+UF0z9PvhdLzDFyM0DODdvbBp4nFJLMdtImJdXmH0sblubYeIhJYR +RcN2H0lB7GRDGAYNXYEUODX/ZTaBhkP8Jb4xKn0VY4LnQIbsZLaahXezkU38llBw5az91 fgAG2ZidRuYVCi8SNdzZedOFdX2C/PtmHcEFP36c6izfl9vBABhwdoZjOhYF9Q== Message-ID: <28715810-1279-45ad-b978-f991ecf49c70@bootlin.com> Date: Thu, 31 Jul 2025 11:50:11 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/4] dt-bindings: display: ti,am65x-dss: Add clk property for data edge synchronization To: Rob Herring Cc: Jyri Sarha , Tomi Valkeinen , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Krzysztof Kozlowski , Conor Dooley , Sam Ravnborg , Benoit Parrot , Lee Jones , Nishanth Menon , Vignesh Raghavendra , Tero Kristo , thomas.petazzoni@bootlin.com, Jyri Sarha , Tomi Valkeinen , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, stable@vger.kernel.org References: <20250730-fix-edge-handling-v1-0-1bdfb3fe7922@bootlin.com> <20250730-fix-edge-handling-v1-1-1bdfb3fe7922@bootlin.com> <20250730235653.GA1914482-robh@kernel.org> Content-Language: en-US From: Louis Chauvet Autocrypt: addr=louis.chauvet@bootlin.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtdefgddutddtgeelucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefkffggfgfuvfevfhfhjggtgfesthekredttddvjeenucfhrhhomhepnfhouhhishcuvehhrghuvhgvthcuoehlohhuihhsrdgthhgruhhvvghtsegsohhothhlihhnrdgtohhmqeenucggtffrrghtthgvrhhnpeekieevtdefgedtkeehteehtddttdefhffhgeejleejjeeluddvhfdugedvkeehveenucffohhmrghinhepsghoohhtlhhinhdrtghomhenucfkphepledtrdekledrudeifedruddvjeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeeltddrkeelrdduieefrdduvdejpdhhvghloheplgduledvrdduieekrddtrddvtdgnpdhmrghilhhfrhhomheplhhouhhishdrtghhrghuvhgvthessghoohhtlhhinhdrtghomhdpnhgspghrtghpthhtohepvdegpdhrtghpthhtoheprhhosghhsehkvghrnhgvlhdrohhrghdprhgtphhtthhopehjhihrihdrshgrrhhhrgesihhkihdrfhhipdhrtghpthhtohepthhomhhirdhvrghlkhgvihhnvghnsehiuggvrghsohhnsghorghrugdrtghomhdprhgtphhtthhopehmrggrrhhtvghnrdhlrghnkhhhohhrshhtsehlihhnuhigrdhinhhtvghlr dgtohhmpdhrtghpthhtohepmhhrihhprghrugeskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepthiiihhmmhgvrhhmrghnnhesshhushgvrdguvgdprhgtphhtthhopegrihhrlhhivggusehgmhgrihhlrdgtohhmpdhrtghpthhtohepshhimhhonhgrsehffhiflhhlrdgthh X-GND-Sasl: louis.chauvet@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250731_025017_542594_B411CF8F X-CRM114-Status: GOOD ( 16.03 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Le 31/07/2025 à 01:56, Rob Herring a écrit : > On Wed, Jul 30, 2025 at 07:02:44PM +0200, Louis Chauvet wrote: >> The dt-bindings for the display, specifically ti,am65x-dss, need to >> include a clock property for data edge synchronization. The current >> implementation does not correctly apply the data edge sampling property. >> >> To address this, synchronization of writes to two different registers is >> required: one in the TIDSS IP (which is already described in the tidss >> node) and one is in the Memory Mapped Control Register Modules (added by >> the previous commit). >> >> As the Memory Mapped Control Register Modules is located in a different >> IP, we need to use a phandle to write values in its registers. > > You can always just lookup the target node by compatible. Then you don't > need a DT update to solve your problem. I just followed what was already done for dss_oldi_io_ctrl/ti,oldi-io-ctrl. I will use syscon_regmap_lookup_by_compatible for the v2. >> >> Fixes: 32a1795f57ee ("drm/tidss: New driver for TI Keystone platform Display SubSystem") >> Signed-off-by: Louis Chauvet >> >> --- >> >> Cc: stable@vger.kernel.org >> --- >> Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml | 6 ++++++ >> 1 file changed, 6 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml b/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml >> index 361e9cae6896c1f4d7fa1ec47a6e3a73bca2b102..b9a373b569170332f671416eb7bbc0c83f7b5ea6 100644 >> --- a/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml >> +++ b/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml >> @@ -133,6 +133,12 @@ properties: >> and OLDI_CLK_IO_CTRL registers. This property is needed for OLDI >> interface to work. >> >> + ti,clk-ctrl: >> + $ref: /schemas/types.yaml#/definitions/phandle >> + description: >> + phandle to syscon device node mapping CFG0_CLK_CTRL registers. >> + This property is needed for proper data sampling edge. >> + >> max-memory-bandwidth: >> $ref: /schemas/types.yaml#/definitions/uint32 >> description: >> >> -- >> 2.50.1 >> -- Louis Chauvet, Bootlin Embedded Linux and Kernel engineering https://bootlin.com