Re: [PATCH V2] arm64: dts: imx8mp-beacon: Configure 100MHz PCIe Ref Clk

[Shawn Guo]

On Sun, Aug 13, 2023 at 11:40:03AM -0500, Adam Ford wrote:
> There is a I2C controlled 100MHz Reference clock used by the PCIe
> controller. Configure this clock's DIF1 output to be used by
> the PCIe.
> 
> Signed-off-by: Adam Ford <aford173@xxxxxxxxx>
> ---
> V2:  Remove the pcie0_refclk clock that the new one replaces.
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts b/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts
> index acd265d8b58e..a8ccde678c33 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts
> @@ -23,6 +23,12 @@ chosen {
>  		stdout-path = &uart2;
>  	};
>  
> +	clk_xtal25: clk-xtal25 {

clock-xtal25 for the node name?

> +		compatible = "fixed-clock";
> +		#clock-cells = <0>;
> +		clock-frequency = <25000000>;
> +	};
> +
>  	connector {
>  		compatible = "usb-c-connector";
>  		label = "USB-C";
> @@ -112,12 +118,6 @@ led-3 {
>  		};
>  	};
>  
> -	pcie0_refclk: clock-pcie {
> -		compatible = "fixed-clock";
> -		#clock-cells = <0>;
> -		clock-frequency = <100000000>;
> -	};
> -
>  	reg_audio: regulator-wm8962 {
>  		compatible = "regulator-fixed";
>  		regulator-name = "3v3_aud";
> @@ -246,6 +246,13 @@ pca6416_3: gpio@20 {
>  		interrupt-controller;
>  		#interrupt-cells = <2>;
>  	};
> +
> +	pcieclk: clk@68 {

clock-generator in the bindings example seems a better node name to me.

Shawn

> +		compatible = "renesas,9fgv0241";
> +		reg = <0x68>;
> +		clocks = <&clk_xtal25>;
> +		#clock-cells = <1>;
> +	};
>  };
>  
>  &i2c3 {
> @@ -372,8 +379,9 @@ &pcie {
>  };
>  
>  &pcie_phy {
> +	fsl,clkreq-unsupported;
>  	fsl,refclk-pad-mode = <IMX8_PCIE_REFCLK_PAD_INPUT>;
> -	clocks = <&pcie0_refclk>;
> +	clocks = <&pcieclk 1>;
>  	clock-names = "ref";
>  	status = "okay";
>  };
> -- 
> 2.39.2
>