From patchwork Tue Aug 13 23:40:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 819004 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (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 504FD22EEF; Tue, 13 Aug 2024 23:40:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723592438; cv=none; b=TLkqK3JH+M1LhCsZyYDYXvxMDM9sRPoDOyFhGzLlD9JWkJWkxduvDfHS8F/B4fvaLdjAHDySpMAezqzc5x1lhUN6fKJd24XNm7/VnXPV6HpVpushOqq1Z02hpFaxrVgo5AgLmANdOVa9Ocqmeh39WSBxue+dJVNYXG10SOBG/0M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723592438; c=relaxed/simple; bh=9+W2TFPV9Zbw1r91dnIlZVDJj3S8mnEu6JTLA39GoqM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=T4iZj82Om4oJgCA2WKZ08pMsyaXR3tNnoWIevNXeIauJb5bR1zXYJ4sCmRE5xM81EUSLNa3WTpr2GZaMQt7c+LomxcDCpqJt/8qdYqi70bgJgVQO1PMp8TiDXa6GHr/pXLEbI/wcTgcKzw2fCX/lF7dIgMHP0l0VUNlQTKapZ2Y= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=Cgdrqcfs; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="Cgdrqcfs" Received: from pendragon.ideasonboard.com (81-175-209-231.bb.dnainternet.fi [81.175.209.231]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 0956A9FF; Wed, 14 Aug 2024 01:39:37 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1723592378; bh=9+W2TFPV9Zbw1r91dnIlZVDJj3S8mnEu6JTLA39GoqM=; h=From:To:Cc:Subject:Date:From; b=Cgdrqcfsu7/9/9h/K5WHCD3AFHTtFESe8osR51mVil0DhzO0s7faY6DJ/CtVS1arR dVW35z1PgkMjmaSJk+qnyQVPuaT1/bGFvEQ8ue8TyTJJvurMDTKhwGCNCqDcZEXORT 7r4SgFSc3dWsgp3PPXZbPZIt1rlAIxE5ugETMmGI= From: Laurent Pinchart To: imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org Cc: Adam Ford , Alexander Stein , Conor Dooley , Fabio Estevam , Krzysztof Kozlowski , Marek Vasut , Paul Elder , Peng Fan , Rob Herring , Sascha Hauer , Shawn Guo , Pengutronix Kernel Team , devicetree@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH] arm64: dts: imx8mp: Clarify csis clock frequency Date: Wed, 14 Aug 2024 02:40:10 +0300 Message-ID: <20240813234010.17852-1-laurent.pinchart@ideasonboard.com> X-Mailer: git-send-email 2.44.2 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The DT nodes for the MIPI CSI-2 receivers (MIPI_CSI) configure the CAM1_PIX and CAM2_PIX clocks to 266 MHz through the assigned-clock-rates property, and report that frequency in the clock-frequency property. The i.MX8MP reference manual and datasheet list 266 MHz as a nominal frequency when using both CSI-2 receivers, so all looks normal. In reality, the clock is actually set to 250 MHz, as the selected parent, IMX8MP_SYS_PLL2_1000M, has a 1/4 output that is selected as the closest frequency to 266 MHz. This doesn't break operation of the device, but is clearly misleading. Clarify the clock configuration by selecting the IMX8MP_SYS_PLL2_250M parent, dropping the redundant assigned-clock-rates, and setting clock-frequency to 250 MHz. This doesn't cause any functional change. Signed-off-by: Laurent Pinchart Reviewed-by: Alexander Stein Tested-by: Alexander Stein --- arch/arm64/boot/dts/freescale/imx8mp.dtsi | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) base-commit: 7c626ce4bae1ac14f60076d00eafe71af30450ba diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi index 603dfe80216f..d9b5c40f6460 100644 --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi @@ -1687,7 +1687,7 @@ mipi_csi_0: csi@32e40000 { compatible = "fsl,imx8mp-mipi-csi2", "fsl,imx8mm-mipi-csi2"; reg = <0x32e40000 0x10000>; interrupts = ; - clock-frequency = <266000000>; + clock-frequency = <250000000>; clocks = <&clk IMX8MP_CLK_MEDIA_APB_ROOT>, <&clk IMX8MP_CLK_MEDIA_CAM1_PIX_ROOT>, <&clk IMX8MP_CLK_MEDIA_MIPI_PHY1_REF_ROOT>, @@ -1695,9 +1695,8 @@ mipi_csi_0: csi@32e40000 { clock-names = "pclk", "wrap", "phy", "axi"; assigned-clocks = <&clk IMX8MP_CLK_MEDIA_CAM1_PIX>, <&clk IMX8MP_CLK_MEDIA_MIPI_PHY1_REF>; - assigned-clock-parents = <&clk IMX8MP_SYS_PLL2_1000M>, + assigned-clock-parents = <&clk IMX8MP_SYS_PLL2_250M>, <&clk IMX8MP_CLK_24M>; - assigned-clock-rates = <266000000>; power-domains = <&media_blk_ctrl IMX8MP_MEDIABLK_PD_MIPI_CSI2_1>; status = "disabled"; @@ -1723,7 +1722,7 @@ mipi_csi_1: csi@32e50000 { compatible = "fsl,imx8mp-mipi-csi2", "fsl,imx8mm-mipi-csi2"; reg = <0x32e50000 0x10000>; interrupts = ; - clock-frequency = <266000000>; + clock-frequency = <250000000>; clocks = <&clk IMX8MP_CLK_MEDIA_APB_ROOT>, <&clk IMX8MP_CLK_MEDIA_CAM2_PIX_ROOT>, <&clk IMX8MP_CLK_MEDIA_MIPI_PHY1_REF_ROOT>, @@ -1731,9 +1730,8 @@ mipi_csi_1: csi@32e50000 { clock-names = "pclk", "wrap", "phy", "axi"; assigned-clocks = <&clk IMX8MP_CLK_MEDIA_CAM2_PIX>, <&clk IMX8MP_CLK_MEDIA_MIPI_PHY1_REF>; - assigned-clock-parents = <&clk IMX8MP_SYS_PLL2_1000M>, + assigned-clock-parents = <&clk IMX8MP_SYS_PLL2_250M>, <&clk IMX8MP_CLK_24M>; - assigned-clock-rates = <266000000>; power-domains = <&media_blk_ctrl IMX8MP_MEDIABLK_PD_MIPI_CSI2_2>; status = "disabled";