On Thu, Apr 11, 2019 at 10:33:53PM +0530, Manikanta Maddireddy wrote:
> Document "nvidia,rst-gpio" optional property which supports GPIO based
> PERST# signal.
> 
> Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
> ---
>  Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt b/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt
> index dca8393b86d1..23928fd59538 100644
> --- a/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt
> @@ -75,6 +75,8 @@ Optional properties:
>    Pass pinctrl phandle to allow driver bring PCIe IO out of DPD state.
>  - nvidia,plat-gpios: A list of platform specific gpios which controls
>    endpoint's internal regulator or PCIe logic.
> +- nvidia,rst-gpio: If GPIO is used as PERST# signal instead of available
> +  SFIO, add this property with phandle to GPIO controller and GPIO number.

GPIO properties are pretty much standardized, so this should really be
called just "reset-gpio".

Also it looks like this is documented in the wrong place. In the example
below you set this property for the root port, that is inside a child
node of the PCI controller, but if I understand correctly, and it's hard
to say from the context, the above is documented as part of the
properties of the host bridge node.

Thierry

>  
>  Required properties on Tegra124 and later (deprecated):
>  - phys: Must contain an entry for each entry in phy-names.
> @@ -671,6 +673,7 @@ Board DTS:
>  
>  		pci@1,0 {
>  			nvidia,num-lanes = <4>;
> +			nvidia,rst-gpio = <&tegra_main_gpio TEGRA_MAIN_GPIO(A, 3) 0>;
>  			status = "okay";
>  		};
>  
> -- 
> 2.17.1
>