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| author | Richard Zhu <hongxing.zhu@nxp.com> | 2025-10-15 06:04:23 +0300 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2025-11-12 04:51:29 +0300 |
| commit | 44f9bcc943f53e25f63becbb471f0909fe77b603 (patch) | |
| tree | 54e47787b5a7d1d1feb16f18e902a93d44fe8ee9 | |
| parent | 053ee55576cec9a94a16680a266f242df1872eb9 (diff) | |
| download | linux-44f9bcc943f53e25f63becbb471f0909fe77b603.tar.xz | |
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>
| -rw-r--r-- | arch/arm64/boot/dts/freescale/imx8qm-mek.dts | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/boot/dts/freescale/imx8qm-mek.dts b/arch/arm64/boot/dts/freescale/imx8qm-mek.dts index 6a75ec612684..0bf2ee33618e 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"; }; |