Re: [PATCH 2/2] dt-bindings: imx6q-pcie: add "fsl,pcie-phy-refclk-internal" for i.MX7D

From: Rob Herring
Date: Tue Aug 27 2019 - 11:56:31 EST


On Tue, Aug 13, 2019 at 11:37:59AM +0100, André Draszik wrote:
> The i.MX7D variant of the IP can use either an external
> crystal oscillator input or an internal clock input as
> a reference clock input for the PCIe PHY.
>
> Document the optional property 'fsl,pcie-phy-refclk-internal'
>
> Signed-off-by: André Draszik <git@xxxxxxxxxx>
> Cc: Richard Zhu <hongxing.zhu@xxxxxxx>
> Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: Shawn Guo <shawnguo@xxxxxxxxxx>
> Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> Cc: Pengutronix Kernel Team <kernel@xxxxxxxxxxxxxx>
> Cc: Fabio Estevam <festevam@xxxxxxxxx>
> Cc: NXP Linux Team <linux-imx@xxxxxxx>
> Cc: linux-pci@xxxxxxxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: devicetree@xxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> ---
> Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> index a7f5f5afa0e6..985d7083df9f 100644
> --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> @@ -56,6 +56,11 @@ Additional required properties for imx7d-pcie and imx8mq-pcie:
> - "turnoff"
> - fsl,imx7d-pcie-phy: A phandle to an fsl,imx7d-pcie-phy node.

Not sure how this got in, but why is the phy binding not used here?

>
> +Additional optional properties for imx7d-pcie:
> +- fsl,pcie-phy-refclk-internal: If present then an internal PLL input is used
> + as PCIe PHY reference clock source. By default an external ocsillator input
> + is used.

Can't the clock binding and maybe 'assigned-clocks' be used here?

Also, this is a property of the PHY, so it belongs in the PHY's node.

Rob