linux-kernel - [PATCH V2 08/10] arm64: dts: imx8mq: Add Root Port node and PERST property

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Message-Id: <20260123021445.3782170-9-sherry.sun@nxp.com>
Date: Fri, 23 Jan 2026 10:14:43 +0800
From: Sherry Sun <sherry.sun@....com>
To: hongxing.zhu@....com,
	l.stach@...gutronix.de,
	lpieralisi@...nel.org,
	kwilczynski@...nel.org,
	mani@...nel.org,
	robh@...nel.org,
	bhelgaas@...gle.com,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	festevam@...il.com,
	frank.li@....com
Cc: kernel@...gutronix.de,
	linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	imx@...ts.linux.dev,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH V2 08/10] arm64: dts: imx8mq: Add Root Port node and PERST property

Since describing the PCIe PERST# property under Host Bridge node is now
deprecated, it is recommended to add it to the Root Port node, so
creating the Root Port node and add the reset-gpios property in Root
Port.

Signed-off-by: Sherry Sun <sherry.sun@....com>
---
 arch/arm64/boot/dts/freescale/imx8mq-evk.dts | 10 +++++++++
 arch/arm64/boot/dts/freescale/imx8mq.dtsi    | 22 ++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
index d48f901487d4..e7d87ea81b69 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
@@ -369,6 +369,7 @@ mipi_dsi_out: endpoint {
 &pcie0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_pcie0>;
+	/* This property is deprecated, use reset-gpios from the Root Port node. */
 	reset-gpio = <&gpio5 28 GPIO_ACTIVE_LOW>;
 	clocks = <&clk IMX8MQ_CLK_PCIE1_ROOT>,
 		 <&pcie0_refclk>,
@@ -389,9 +390,14 @@ &pcie0_ep {
 	status = "disabled";
 };
 
+&pcie0_port0 {
+	reset-gpios = <&gpio5 28 GPIO_ACTIVE_LOW>;
+};
+
 &pcie1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_pcie1>;
+	/* This property is deprecated, use reset-gpios from the Root Port node. */
 	reset-gpio = <&gpio5 12 GPIO_ACTIVE_LOW>;
 	clocks = <&clk IMX8MQ_CLK_PCIE2_ROOT>,
 		 <&pcie0_refclk>,
@@ -414,6 +420,10 @@ &pcie1_ep {
 	status = "disabled";
 };
 
+&pcie1_port0 {
+	reset-gpios = <&gpio5 12 GPIO_ACTIVE_LOW>;
+};
+
 &pgc_gpu {
 	power-supply = <&sw1a_reg>;
 };
diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
index 607962f807be..de2ba4ee9da6 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
@@ -1768,6 +1768,17 @@ pcie0: pcie@...00000 {
 			assigned-clock-rates = <250000000>, <100000000>,
 			                       <10000000>;
 			status = "disabled";
+
+			pcie0_port0: pcie@0 {
+				compatible = "pciclass,0604";
+				device_type = "pci";
+				reg = <0x0 0x0 0x0 0x0 0x0>;
+				bus-range = <0x01 0xff>;
+
+				#address-cells = <3>;
+				#size-cells = <2>;
+				ranges;
+			};
 		};
 
 		pcie0_ep: pcie-ep@...00000 {
@@ -1846,6 +1857,17 @@ pcie1: pcie@...00000 {
 			assigned-clock-rates = <250000000>, <100000000>,
 			                       <10000000>;
 			status = "disabled";
+
+			pcie1_port0: pcie@0 {
+				compatible = "pciclass,0604";
+				device_type = "pci";
+				reg = <0x0 0x0 0x0 0x0 0x0>;
+				bus-range = <0x01 0xff>;
+
+				#address-cells = <3>;
+				#size-cells = <2>;
+				ranges;
+			};
 		};
 
 		pcie1_ep: pcie-ep@...00000 {
-- 
2.37.1