arm64: dts: imx8mq-evk: 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#.

imx8mq-evk 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>

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Richard Zhu 2025-10-15 11:04:22 +08:00 • committed by Shawn Guo

parent 45b68efd9b

commit 053ee55576

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arch/arm64/boot/dts/freescale/imx8mq-evk.dts

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