Re: [PATCH v2] arm64: dts: imx8mp: Align both CSI2 pixel clock

From: Alexander Stein <alexander.stein@ew.tq-group.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Marek Vasut <marex@denx.de>, Conor Dooley <conor+dt@kernel.org>,
	Fabio Estevam <festevam@gmail.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Paul Elder <paul.elder@ideasonboard.com>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Rob Herring <robh@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Shawn Guo <shawnguo@kernel.org>,
	devicetree@vger.kernel.org, imx@lists.linux.dev,
	Marek Vasut <marex@denx.de>
Subject: Re: [PATCH v2] arm64: dts: imx8mp: Align both CSI2 pixel clock
Date: Wed, 17 Apr 2024 11:12:04 +0200	[thread overview]
Message-ID: <2327389.ElGaqSPkdT@steina-w> (raw)
In-Reply-To: <20240416141914.9375-1-marex@denx.de>

Am Dienstag, 16. April 2024, 16:19:10 CEST schrieb Marek Vasut:
> Configure both CSI2 assigned-clock-rates the same way.
> There does not seem to be any reason for keeping the
> two CSI2 pixel clock set to different frequencies.
> 
> This also reduces first CSI2 clock from overdrive mode
> frequency which is 500 MHz down below the regular mode
> frequency of 400 MHz.
> 
> Signed-off-by: Marek Vasut <marex@denx.de>

Apparently there is no difference when using imx415 (3840x2160) sensor.
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>

> ---
> Cc: Conor Dooley <conor+dt@kernel.org>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Cc: Paul Elder <paul.elder@ideasonboard.com>
> Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
> Cc: Rob Herring <robh@kernel.org>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Shawn Guo <shawnguo@kernel.org>
> Cc: devicetree@vger.kernel.org
> Cc: imx@lists.linux.dev
> Cc: linux-arm-kernel@lists.infradead.org
> ---
> V2: Align both clock to 266 MHz and update commit message
> ---
>  arch/arm64/boot/dts/freescale/imx8mp.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> index 1bb96e96639f2..7883f5c056f4e 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> @@ -1667,7 +1667,7 @@ mipi_csi_0: csi@32e40000 {
>  						  <&clk IMX8MP_CLK_MEDIA_MIPI_PHY1_REF>;
>  				assigned-clock-parents = <&clk IMX8MP_SYS_PLL2_1000M>,
>  							 <&clk IMX8MP_CLK_24M>;
> -				assigned-clock-rates = <500000000>;
> +				assigned-clock-rates = <266000000>;
>  				power-domains = <&media_blk_ctrl IMX8MP_MEDIABLK_PD_MIPI_CSI2_1>;
>  				status = "disabled";
>  
> 

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