From 44f9bcc943f53e25f63becbb471f0909fe77b603 Mon Sep 17 00:00:00 2001 From: Richard Zhu Date: Wed, 15 Oct 2025 11:04:23 +0800 Subject: [PATCH] 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 Reviewed-by: Frank Li Signed-off-by: Shawn Guo --- 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 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 = <®_pciea>; + supports-clkreq; status = "okay"; }; -- 2.47.3