From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx08-00178001.pphosted.com (mx08-00178001.pphosted.com [91.207.212.93]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 76C56283FE6; Tue, 12 Aug 2025 13:51:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.207.212.93 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755006688; cv=none; b=VrKbx+c1ztzmCyYSAu+r4ZLCZBKVkOecGUxr0CqD9NK7wRwPN92LCgteftYIX154Q4s8+DACJ9d1rFy9pzfkRF/zWO8tUuINYBRWk9cikJjoGBSajHpz4681Z3j0A5CMcyHSfxAh0cr2fnVzZrbrSPtKnqaLLeqORNiN+Of7mx0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755006688; c=relaxed/simple; bh=02MYS0GAVjtHjBMAjpmm61FQqy93aJkhjK2T/l1rZuw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-ID:References: In-Reply-To:To:CC; b=TwrXU6RQw3gVW4eA4uNA0yZLOj6SfdThWM+v5FSjnIiHkwIR0vASu5RoAyZ9Rb37NovBnn1HmimNupcIx2jmz0fwR8NiZmYUCzSJc2meZC5RcY+PNheFH9PPx5V0BTd3Q9pJ4RWTVZIiPz90WoOcchk0ggf3Vswfic1pqJz41L8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=foss.st.com; spf=pass smtp.mailfrom=foss.st.com; dkim=pass (2048-bit key) header.d=foss.st.com header.i=@foss.st.com header.b=ofvFiU8T; arc=none smtp.client-ip=91.207.212.93 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=foss.st.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=foss.st.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=foss.st.com header.i=@foss.st.com header.b="ofvFiU8T" Received: from pps.filterd (m0369457.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 57CCM5mY016353; Tue, 12 Aug 2025 15:51:10 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=selector1; bh= ACBF/XewF9ltNTPIvrsgsmJlHAjTuMQ64yXm9zsSnVo=; b=ofvFiU8T9zR0gGeK gZZI1WUFkDmCK8+9N/xNXLZDpREqfGtp2+0Odc6YIA06BpTYdBAIqWXfjx7L07kY F1YbwZ29ktQaJthCdu+q6jxFF5vBpUQpldWG+qtB+8fbOSPMupH/Z1InIUYIb592 mquBOGQe49brJvI7dR8V4HfWtsce4FPJUIpY7/J0evOV7IrPdqkokEPQrvELKhtD FMBlHYbRP+QMy5NdOx0pzLeeSZRZIKD7yBb2F0YUX0bWd37HYhoNQ5qEPHY+Dygg h3h0f7j37Xy+bztM580DjaMZEFpx6XVmjtb6Xlab168oFnK+7U91q1vrQddOcCoA mSWx4g== Received: from beta.dmz-ap.st.com (beta.dmz-ap.st.com [138.198.100.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 48eh9n8c2m-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 12 Aug 2025 15:51:10 +0200 (MEST) Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-ap.st.com (STMicroelectronics) with ESMTP id E6CE7400AE; Tue, 12 Aug 2025 15:49:27 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node2.st.com [10.75.129.70]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 2486678C45C; Tue, 12 Aug 2025 15:49:08 +0200 (CEST) Received: from localhost (10.130.74.180) by SHFDAG1NODE2.st.com (10.75.129.70) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Tue, 12 Aug 2025 15:49:07 +0200 From: Raphael Gallais-Pou Date: Tue, 12 Aug 2025 15:49:10 +0200 Subject: [PATCH v2 13/13] arm64: dts: st: add loopback clocks on LTDC node Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-ID: <20250812-drm-misc-next-v2-13-132fd84463d7@foss.st.com> References: <20250812-drm-misc-next-v2-0-132fd84463d7@foss.st.com> In-Reply-To: <20250812-drm-misc-next-v2-0-132fd84463d7@foss.st.com> To: Yannick Fertre , Philippe Cornu , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maxime Coquelin , Alexandre Torgue , Catalin Marinas , Will Deacon , Christophe Roullier CC: , , , , X-Mailer: b4 0.14.2 X-ClientProxiedBy: EQNCAS1NODE4.st.com (10.75.129.82) To SHFDAG1NODE2.st.com (10.75.129.70) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-08-12_07,2025-08-11_01,2025-03-28_01 ck_ker_ltdc has the CLK_SET_RATE_PARENT flag. While having this flag is semantically correct, it for now leads to an improper setting of the clock rate. The ck_ker_ltdc parent clock is the flexgen 27, which does not support changing rates yet. To overcome this issue, a fixed clock can be used for the kernel clock. Add the clocks needed for the LTDC to work. Signed-off-by: Raphael Gallais-Pou --- arch/arm64/boot/dts/st/stm32mp251.dtsi | 6 ++++++ arch/arm64/boot/dts/st/stm32mp255.dtsi | 5 +++++ 2 files changed, 11 insertions(+) diff --git a/arch/arm64/boot/dts/st/stm32mp251.dtsi b/arch/arm64/boot/dts/st/stm32mp251.dtsi index d833b2b7904bef1cf1db8f1da210a1abd8a87d09..55f63cb7b881a91498042a71fcd39ac5191ad47d 100644 --- a/arch/arm64/boot/dts/st/stm32mp251.dtsi +++ b/arch/arm64/boot/dts/st/stm32mp251.dtsi @@ -52,6 +52,12 @@ clk_rcbsec: clk-rcbsec { compatible = "fixed-clock"; clock-frequency = <64000000>; }; + + clk_flexgen_27_fixed: clk-54000000 { + #clock-cells = <0>; + compatible = "fixed-clock"; + clock-frequency = <54000000>; + }; }; firmware { diff --git a/arch/arm64/boot/dts/st/stm32mp255.dtsi b/arch/arm64/boot/dts/st/stm32mp255.dtsi index a3b5ae25d28c83ade12c2ff69b82c9cccfd29b00..07c200470b2cedde771ae987f2267d6097ea78f0 100644 --- a/arch/arm64/boot/dts/st/stm32mp255.dtsi +++ b/arch/arm64/boot/dts/st/stm32mp255.dtsi @@ -5,6 +5,11 @@ */ #include "stm32mp253.dtsi" +<dc { + clocks = <&clk_flexgen_27_fixed>, <&rcc CK_BUS_LTDC>, <&syscfg>, <&lvds>; + clock-names = "lcd", "bus", "ref", "lvds"; +}; + &rifsc { lvds: lvds@48060000 { compatible = "st,stm32mp255-lvds", "st,stm32mp25-lvds"; -- 2.25.1