From: Richard Zhu <hongxing.zhu@nxp.com>
Date: Wed, 15 Oct 2025 03:04:23 +0000 (+0800)
Subject: arm64: dts: imx8qm-mek: Add supports-clkreq property to PCIe M.2 port
X-Git-Tag: v6.19-rc1~100^2~20^2~75
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=44f9bcc943f53e25f63becbb471f0909fe77b603;p=thirdparty%2Fkernel%2Flinux.git

arm64: dts: imx8qm-mek: Add supports-clkreq property to PCIe M.2 port

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@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
---

diff --git a/arch/arm64/boot/dts/freescale/imx8qm-mek.dts b/arch/arm64/boot/dts/freescale/imx8qm-mek.dts
index 6a75ec612684e..0bf2ee33618e8 100644
--- a/arch/arm64/boot/dts/freescale/imx8qm-mek.dts
+++ b/arch/arm64/boot/dts/freescale/imx8qm-mek.dts
@@ -784,6 +784,7 @@
 	pinctrl-names = "default";
 	reset-gpio = <&lsio_gpio4 29 GPIO_ACTIVE_LOW>;
 	vpcie-supply = <&reg_pciea>;
+	supports-clkreq;
 	status = "okay";
 };