On 09/28/2017 08:53 AM, Geert Uytterhoeven wrote:
> Describe the GPIO used to reset the Ethernet PHY for EthernetAVB.
> This allows the driver to reset the PHY during probe and after system
> resume.
>
> This fixes Ethernet operation after resume from s2ram on Salvator-XS,
> where the enable pin of the regulator providing PHY power is connected
> to PRESETn, and PSCI powers down the SoC during system suspend.
>
> On Salvator-X, the enable pin is always pulled high, but the driver may
> still need to reset the PHY if this wasn't done by the bootloader
> before.
>
> Inspired by patches in the BSP for the individual Salvator-X/XS boards
> by Kazuya Mizuguchi.
>
> Signed-off-by: Geert Uytterhoeven <geert+rene...@glider.be>
> ---
> For proper PHY reset operation during system resume, this depends on
> "ravb: Add missing PHY reset during system resume".
> However, this patch can be applied independently.
> ---
> arch/arm64/boot/dts/renesas/salvator-common.dtsi | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/boot/dts/renesas/salvator-common.dtsi
> b/arch/arm64/boot/dts/renesas/salvator-common.dtsi
> index ed4a8dfead3c2e58..db00e7c484f76eac 100644
> --- a/arch/arm64/boot/dts/renesas/salvator-common.dtsi
> +++ b/arch/arm64/boot/dts/renesas/salvator-common.dtsi
> @@ -296,6 +296,7 @@
> pinctrl-names = "default";
> renesas,no-ether-link;
> phy-handle = <&phy0>;
> + reset-gpios = <&gpio2 10 GPIO_ACTIVE_LOW>;
> status = "okay";
>
> phy0: ethernet-phy@0 {
This should be a PHY node property, unless this GPIO pin really is
global to the MDIO bus itself.
Florian
