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 07735C87FCC for ; Thu, 31 Jul 2025 09:55:51 +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=oQZaEeF9d7skWsfawRi1lhOPl2zgtzHvwTKPULZo3oY=; b=4W3f6/1ZNYX8au34gmvBDa2aAd H69C2GcLALRTdIwsCim2MrANQLzBEwWU1XiaNNDcCjfq248iv+NwsQvJUdFLVx5i9UWwmcRskH6by xNi/fILH4p9rNGPvNUx4n/xkl5rIVAZU/2Lb0IexqbHrm98T2stJO8+PSkrGFPZ5aIWUFK/sDGt// 4cQ3z3sovyVgnm7bi28mK4q1rFlFKu0bMG3HhdH/1p8MjK3gHEdCYN1dWgIK0LISDGs73G//yyMjr VG3BrMKYgKYkrzz0N8xfhX1KwJd506ZYb3u+/3tKl7Dfed3UZJWQHA+BOXpHDUaw6lxE7Shp6PhEp jaXuGIoQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uhQ0k-00000003Jvq-2FSv; Thu, 31 Jul 2025 09:55:42 +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 1uhPvX-00000003JYs-2YyV for linux-arm-kernel@lists.infradead.org; Thu, 31 Jul 2025 09:50:21 +0000 Received: by mail.gandi.net (Postfix) with ESMTPSA id 15CA243854; Thu, 31 Jul 2025 09:50:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1753955418; 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=oQZaEeF9d7skWsfawRi1lhOPl2zgtzHvwTKPULZo3oY=; b=O2s09FwLDoyIJnk/6dSjw3g3U7UcPzW9P4u7udmFTu0FSLNhbqZQgC/L851x4QIWbNeiKX CAj03MM4/ipe3/IALyAtpEt5XGCb3vgZJMxfOp5ltuwCjQneLW5kXWPVrbkQOrQpVXZRBj iHqp9cjZdA6QvsgcyAlhnwdpt5F9LIAnxoiOGGLUyXxTzJ1kG8/3vS5M3jI583MVUsrgVz uu0tUdBY7rS7YZU06ZK7VJKL8q93C+bkD7asgweDVaPfcbEQ+SIUi1POmbRJgY//OXC//W OVtPn3yZyla+Y4O6BNxt18eYzPukHlBkwPQDf5CBvX5H0wftyH0LwYWpxFVm4A== Message-ID: <8a2b1876-d1d4-4523-ae6a-bd14875772cf@bootlin.com> Date: Thu, 31 Jul 2025 11:50:16 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/4] arm64: dts: ti: k3-am62-main: Add tidss clk-ctrl property 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-v1-3-1bdfb3fe7922@bootlin.com> <20250731001725.GA1938112-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: gggruggvucftvghtrhhoucdtuddrgeeffedrtdefgddutddtgeelucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefkffggfgfuvfevfhfhjggtgfesthekredttddvjeenucfhrhhomhepnfhouhhishcuvehhrghuvhgvthcuoehlohhuihhsrdgthhgruhhvvghtsegsohhothhlihhnrdgtohhmqeenucggtffrrghtthgvrhhnpeetieekffetjeeugfdvfefhudetueelleetuddvtddtvdehgefgudeugfehgeelfeenucffohhmrghinhepthhirdgtohhmpdgsohhothhlihhnrdgtohhmnecukfhppeeltddrkeelrdduieefrdduvdejnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepledtrdekledrudeifedruddvjedphhgvlhhopegludelvddrudeikedrtddrvddtngdpmhgrihhlfhhrohhmpehlohhuihhsrdgthhgruhhvvghtsegsohhothhlihhnrdgtohhmpdhnsggprhgtphhtthhopedvgedprhgtphhtthhopehrohgshheskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepjhihrhhirdhsrghrhhgrsehikhhirdhfihdprhgtphhtthhopehtohhmihdrvhgrlhhkvghinhgvnhesihguvggrshhonhgsohgrrhgurdgtohhmpdhrtghpthhtohepmhgrrghrthgvnhdrlhgrnhhkhhhorhhstheslhhinhhug idrihhnthgvlhdrtghomhdprhgtphhtthhopehmrhhiphgrrhgusehkvghrnhgvlhdrohhrghdprhgtphhtthhopehtiihimhhmvghrmhgrnhhnsehsuhhsvgdruggvpdhrtghpthhtoheprghirhhlihgvugesghhmrghilhdrtghomhdprhgtphhtthhopehsihhmohhnrgesfhhffihllhdrtghh X-GND-Sasl: louis.chauvet@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250731_025019_923844_6E9F1C2A X-CRM114-Status: GOOD ( 16.29 ) 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 02:17, Rob Herring a écrit : > On Wed, Jul 30, 2025 at 07:02:46PM +0200, Louis Chauvet wrote: >> For am62 processors, we need to use the newly created clk-ctrl property to >> properly handle data edge sampling configuration. Add them in the main >> device tree. >> >> Fixes: 32a1795f57ee ("drm/tidss: New driver for TI Keystone platform Display SubSystem") >> Signed-off-by: Louis Chauvet >> --- >> >> Cc: stable@vger.kernel.org >> --- >> arch/arm64/boot/dts/ti/k3-am62-main.dtsi | 6 ++++++ >> 1 file changed, 6 insertions(+) >> >> diff --git a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi >> index 9e0b6eee9ac77d66869915b2d7bec3e2275c03ea..d3131e6da8e70fde035d3c44716f939e8167795a 100644 >> --- a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi >> +++ b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi >> @@ -76,6 +76,11 @@ audio_refclk1: clock-controller@82e4 { >> assigned-clock-parents = <&k3_clks 157 18>; >> #clock-cells = <0>; >> }; >> + >> + dss_clk_ctrl: dss_clk_ctrl@8300 { >> + compatible = "ti,am625-dss-clk-ctrl", "syscon"; >> + reg = <0x8300 0x4>; > > H/w blocks are rarely only 4 bytes of registers... Does this belong to > some larger block. The problem with bindings defining single registers > like this is they don't get defined until needed and you have a constant > stream of DT updates. In this case, I don't think there is a "larger block". This register exists only because TI had issues in the display controller [1]. Here is the extract of MMR registers ([2], page 4311): [...] A2E4h AUDIO_REFCLK1_CTRL_PROXY A300h DPI0_CLK_CTRL_PROXY A320h DSS_DISPC0_CLKSEL1_PROXY A330h MCASP0_CLKSEL_PROXY [...] I agree that DSS_DISPC_CLKSEL_PROXY is also related to DSS clock stuff, so may be included in the same block, but there is also a big hole in between. What do you think is better? [1]:https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1228207/am62a7-rgb-display-flickering-and-pixel-issue/4687209#4687209 [2]:https://www.ti.com/lit/ug/spruiv7b/spruiv7b.pdf#page=4311 >> + }; >> }; >> >> dmss: bus@48000000 { >> @@ -787,6 +792,7 @@ dss: dss@30200000 { >> <&k3_clks 186 2>; >> clock-names = "fck", "vp1", "vp2"; >> interrupts = ; >> + ti,clk-ctrl = <&dss_clk_ctrl>; >> status = "disabled"; >> >> dss_ports: ports { >> >> -- >> 2.50.1 >> -- Louis Chauvet, Bootlin Embedded Linux and Kernel engineering https://bootlin.com