From 053ee55576cec9a94a16680a266f242df1872eb9 Mon Sep 17 00:00:00 2001 From: Richard Zhu Date: Wed, 15 Oct 2025 11:04:22 +0800 Subject: [PATCH] arm64: dts: imx8mq-evk: 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#. imx8mq-evk 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/imx8mq-evk.dts | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts index a88bc90346636..852992b915a39 100644 --- a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts +++ b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts @@ -375,6 +375,7 @@ <&clk IMX8MQ_CLK_PCIE1_PHY>, <&clk IMX8MQ_CLK_PCIE1_AUX>; vph-supply = <&vgen5_reg>; + supports-clkreq; status = "okay"; }; @@ -398,6 +399,7 @@ <&clk IMX8MQ_CLK_PCIE2_AUX>; vpcie-supply = <®_pcie1>; vph-supply = <&vgen5_reg>; + supports-clkreq; status = "okay"; }; -- 2.47.3