linux-kernel - Re: [PATCH 1/3] arm64: dts: imx8mm: Simplify mipi

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Date:   Thu, 30 Nov 2023 16:42:53 +0100
From:   Frieder Schrempf <frieder.schrempf@...tron.de>
To:     Adam Ford <aford173@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     aford@...conembeded.com, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] arm64: dts: imx8mm: Simplify mipi_dsi clocks

On 28.11.23 05:54, Adam Ford wrote:
> The device tree clock structure for the mipi_dsi is
> unnecessarily redundant.
> 
> The default clock parent of IMX8MM_CLK_DSI_PHY_REF is
> already IMX8MM_CLK_24M, so there is no need to set the
> parent-child relationship between them.  The default clock
> rates for IMX8MM_SYS_PLL1_266M and IMX8MM_CLK_24M are
> already defined to be 266MHz and 24MHz respectively,
> so there is no need to define those clock rates.
> 
> On i.MX8M[MNP] the  samsung,pll-clock-frequency is not
> necessary, because the driver will read it from sclk_mipi
> which is also already set to 24MHz making it also
> redundant.
> 
> Signed-off-by: Adam Ford <aford173@...il.com>
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> index 738024baaa57..8d872568231d 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> @@ -1151,12 +1151,8 @@ mipi_dsi: dsi@...10000 {
>  				clocks = <&clk IMX8MM_CLK_DSI_CORE>,
>  					 <&clk IMX8MM_CLK_DSI_PHY_REF>;
>  				clock-names = "bus_clk", "sclk_mipi";
> -				assigned-clocks = <&clk IMX8MM_CLK_DSI_CORE>,
> -						  <&clk IMX8MM_CLK_DSI_PHY_REF>;
> -				assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_266M>,
> -							 <&clk IMX8MM_CLK_24M>;
> -				assigned-clock-rates = <266000000>, <24000000>;
> -				samsung,pll-clock-frequency = <24000000>;
> +				assigned-clocks = <&clk IMX8MM_CLK_DSI_CORE>;
> +				assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_266M>;
>  				interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>;
>  				power-domains = <&disp_blk_ctrl IMX8MM_DISPBLK_PD_MIPI_DSI>;
>  				status = "disabled";

Thanks for the cleanup!

Reviewed-by: Frieder Schrempf <frieder.schrempf@...tron.de>
Tested-by: Frieder Schrempf <frieder.schrempf@...tron.de> # Kontron BL
i.MX8MM