linux-kernel - [PATCH] arm64: dts: imx8mp-beacon: Configure 100MHz PCIe Ref Clk

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Date:   Sun,  6 Aug 2023 14:06:21 -0500
From:   Adam Ford <aford173@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     aford@...conembedded.com, cstevens@...conembedded.com,
        Adam Ford <aford173@...il.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>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org
Subject: [PATCH] arm64: dts: imx8mp-beacon: Configure 100MHz PCIe Ref Clk

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@...il.com>

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts b/arch/arm64/boot/dts/freescale/imx8mp-beacon-kit.dts
index 06e91297fb16..332269dedeee 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 {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <25000000>;
+	};
+
 	connector {
 		compatible = "usb-c-connector";
 		label = "USB-C";
@@ -246,6 +252,13 @@ pca6416_3: gpio@20 {
 		interrupt-controller;
 		#interrupt-cells = <2>;
 	};
+
+	pcieclk: clk@68 {
+		compatible = "renesas,9fgv0241";
+		reg = <0x68>;
+		clocks = <&clk_xtal25>;
+		#clock-cells = <1>;
+	};
 };
 
 &i2c3 {
@@ -372,8 +385,9 @@ &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