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l.stach@pengutronix.de; > > lpieralisi@kernel.org; kwilczynski@kernel.org; mani@kernel.org; > > robh@kernel.org; krzk+dt@kernel.org; conor+dt@kernel.org; > > bhelgaas@google.com; shawnguo@kernel.org; s.hauer@pengutronix.de; > > kernel@pengutronix.de; festevam@gmail.com; linux-pci@vger.kernel.org; > > linux-arm-kernel@lists.infradead.org; devicetree@vger.kernel.org; > > imx@lists.linux.dev; linux-kernel@vger.kernel.org > > Subject: Re: [PATCH v6 01/11] arm64: dts: imx95-15x15-evk: Add > > supports-clkreq property to PCIe M.2 port > > > > On Wed, Oct 15, 2025 at 11:04:18AM +0800, Richard Zhu wrote: > > > 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#. > > > > > > imx95-15x15-evk matches this requirement, so add supports-clkreq to > > > allow PCIe device enter ASPM L1 Sub-State. > > > > > > Signed-off-by: Richard Zhu > > > --- > > > arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts | 1 + > > > 1 file changed, 1 insertion(+) > > > > > > diff --git a/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts > > > b/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts > > > index 148243470dd4a..3ee032c154fa3 100644 > > > --- a/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts > > > +++ b/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts > > > @@ -556,6 +556,7 @@ &pcie0 { > > > pinctrl-names = "default"; > > > reset-gpio = <&gpio5 13 GPIO_ACTIVE_LOW>; > > > vpcie-supply = <®_m2_pwr>; > > > + supports-clkreq; > > > > Is binding updated for this property? > > > > Shawn > > > Hi Shawn: > As I know that It's a documented binding property as below. > - supports-clkreq: > If present this property specifies that CLKREQ signal routing exists from > root port to downstream device and host bridge drivers can do programming > which depends on CLKREQ signal existence. For example, programming root port > not to advertise ASPM L1 Sub-States support if there is no CLKREQ signal. > ./Documentation/devicetree/bindings/pci/pci.txt Shawn: This file should be removed. It is already merge to Rob's dt-scheme as PCIe standard properties. See: https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/pci/pci-bus-common.yaml Frank > > Best Regards > Richard Zhu > > > > status = "okay"; > > > }; > > > > > > -- > > > 2.37.1 > > > >