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Date: Sun, 24 Sep 2023 20:46:50 +0800
From: Shawn Guo <shawnguo@kernel.org>
To: Adam Ford <aford173@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org, aford@beaconembedded.com,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	NXP Linux Team <linux-imx@nxp.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Magnus Damm <magnus.damm@gmail.com>, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org
Subject: Re: [PATCH V2] arm64: dts: imx8mp-beacon: Configure 100MHz PCIe Ref
 Clk
Message-ID: <20230924124650.GD7231@dragon>
References: <20230813164003.23665-1-aford173@gmail.com>
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In-Reply-To: <20230813164003.23665-1-aford173@gmail.com>

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@gmail.com>
> ---
> 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
>