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SubjectRe: [linux-sunxi] [PATCH v4 5/9] arm64: dts: allwinner: orange-pi-3: Enable ethernet
On Sat, Apr 13, 2019 at 10:24 PM megous via linux-sunxi
<linux-sunxi@googlegroups.com> wrote:
>
> From: Ondrej Jirman <megous@megous.com>
>
> Orange Pi 3 has two regulators that power the Realtek RTL8211E. According
> to the phy datasheet, both regulators need to be enabled at the same time,
> but we can only specify a single phy-supply in the DT.
>
> This can be achieved by making one regulator depedning on the other via
> vin-supply. While it's not a technically correct description of the
> hardware, it achieves the purpose.
>
> All values of RX/TX delay were tested exhaustively and a middle one of the
> working values was chosen.
>
> Signed-off-by: Ondrej Jirman <megous@megous.com>
> ---
> .../dts/allwinner/sun50i-h6-orangepi-3.dts | 44 +++++++++++++++++++
> 1 file changed, 44 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts
> index 17d496990108..6d6b1f66796d 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts
> @@ -15,6 +15,7 @@
>
> aliases {
> serial0 = &uart0;
> + ethernet0 = &emac;
> };
>
> chosen {
> @@ -44,6 +45,27 @@
> regulator-max-microvolt = <5000000>;
> regulator-always-on;
> };
> +
> + /*
> + * The board uses 2.5V RGMII signalling. Power sequence to enable
> + * the phy is to enable GMAC-2V5 and GMAC-3V3 (aldo2) power rails
> + * at the same time and to wait 100ms.
> + */
> + reg_gmac_2v5: gmac-2v5 {
> + compatible = "regulator-fixed";
> + regulator-name = "gmac-2v5";
> + regulator-min-microvolt = <2500000>;
> + regulator-max-microvolt = <2500000>;
> + startup-delay-us = <100000>;
> + enable-active-high;
> + gpio = <&pio 3 6 GPIO_ACTIVE_HIGH>; /* PD6 */
> +
> + /* The real parent of gmac-2v5 is reg_vcc5v, but we need to
> + * enable two regulators to power the phy. This is one way
> + * to achieve that.
> + */
> + vin-supply = <&reg_aldo2>; /* GMAC-3V3 */

The actual output supply pin name is GMAC-3V which has an input of
VCC3V3-MAC (ie aldo2), if we compatible to schematics better to use
the same, IMHO.

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