Starting with the i.MX7, arch PCIe instance has a differential refclk pad, which can beused in multiple ways: - It's not used at all and the PHY reference clock is provided by a SoC internal source, like on the previous SOCs. - It's used as a clock input, for the board to provide a reference clock for the PHY. - It's used as a clock output, where the PHY reference clock is provided by a SoC internal source and the same clock is also routed to the refclk pad for consumption of board-level components. Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx> --- 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 308540df99ef..3ebd8553a818 100644 --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt @@ -38,6 +38,11 @@ Optional properties: The regulator will be enabled when initializing the PCIe host and disabled either as part of the init process or when shutting down the host. +- fsl,refclk-pad-mode: Usage mode of the refclk pad. Valid values: + - 0: pad not used. PHY refclock is derived from SoC internal source. + - 1: pad input. PHY refclock is provided externally via the refclk pad. + - 2: pad output. PHY refclock is derived from SoC internal source and + provided on the refclk pad. Additional required properties for imx6sx-pcie: - clock names: Must include the following additional entries: -- 2.29.2
