linux-kernel - [PATCH 7/8] arm64: dts: imx8qm-mek: add supports-clkreq property to PCIe M.2 port

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Message-Id: <20251028-b4_qm_dts-v1-7-51ba94389c1f@nxp.com>
Date: Tue, 28 Oct 2025 16:30:48 -0400
From: Frank Li <Frank.Li@....com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.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>
Cc: devicetree@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Frank Li <Frank.Li@....com>, Richard Zhu <hongxing.zhu@....com>
Subject: [PATCH 7/8] arm64: dts: imx8qm-mek: add supports-clkreq property
 to PCIe M.2 port

From: Richard Zhu <hongxing.zhu@....com>

According to PCIe r6.1, sec 5.5.1.

The following rules define how the L1.1 and L1.2 substates are entered:
Both the Upstream and Downstream Ports must monitor the logical state of
the CLKREQ# signal.

Typical implement is using open drain, which connect RC's clkreq# to
EP's clkreq# together and pull up clkreq#.

imx8qm-mek matches this requirement, so add supports-clkreq to allow
PCIe device enter ASPM L1 Sub-State.

Signed-off-by: Richard Zhu <hongxing.zhu@....com>
Signed-off-by: Frank Li <Frank.Li@....com>
---
 arch/arm64/boot/dts/freescale/imx8qm-mek.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8qm-mek.dts b/arch/arm64/boot/dts/freescale/imx8qm-mek.dts
index 578bbee5a861397b4f8528d4c7746630a40f2935..64479802a6cb85adc2c817c0e605e8a1e970aa45 100644
--- a/arch/arm64/boot/dts/freescale/imx8qm-mek.dts
+++ b/arch/arm64/boot/dts/freescale/imx8qm-mek.dts
@@ -794,6 +794,7 @@ &pciea {
 	pinctrl-names = "default";
 	reset-gpio = <&lsio_gpio4 29 GPIO_ACTIVE_LOW>;
 	vpcie-supply = <&reg_pciea>;
+	supports-clkreq;
 	status = "okay";
 };
 

-- 
2.34.1