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arm64: dts: imx8qxp-mek: Add supports-clkreq property to PCIe M.2 port

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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#.

imx8qxp-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>
This commit is contained in:
Richard Zhu
2025-10-15 11:04:24 +08:00
committed by Shawn Guo
parent 44f9bcc943
commit 1a79e70e9d
1 changed files with 1 additions and 0 deletions
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arch/arm64/boot/dts/freescale/imx8qxp-mek.dts
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@@ -640,6 +640,7 @@
pinctrl-names = "default";
reset-gpios = <&lsio_gpio4 0 GPIO_ACTIVE_LOW>;
vpcie-supply = <&reg_pcieb>;
supports-clkreq;
status = "okay";
};