On Thu, Apr 26, 2018 at 3:57 AM, Anson Huang <anson.huang@xxxxxxx> wrote:
> The 'phy-supply' is for enabling/disabling phy regulator, but here the MAX7322 IO0 is NOT for
> enabling/disabling PHY regulator, it is for IO voltage switch between 1.5V and 1.8V, our ENET
> IO can work with both 1.5V and 1.8V, so any config is OK for ENET function.
Thanks for the clarification.
> The 1.5V/1.8V selection is a one time setting thing, that means we only need to
> config it once during boot up, most of i.MX platforms does NOT provide such voltage
> switch function for ENET IO, on this 6SX sabre auto board, it is more like a backup or
> validation purpose. With default settings, ENET's function is NOT impacted at all.
>
> I think we can add a gpio regulator for it and let the regulator initialization set the GPIO
> Level for fec, such below, with " enable-active-high " present, GPIO will be at LOW and voltage
> is 1.5V, without this property, GPIO will be HIGH and voltage will be 1.8V.
> + reg_fec: fec_io_supply {
> + compatible = "regulator-gpio";
> + regulator-name = "1.8V_1.5V_FEC";
> + regulator-min-microvolt = <1500000>;
> + regulator-max-microvolt = <1800000>;
> + states = <1500000 0x0 1800000 0x1>;
> + enable-gpio = <&max7322 0 GPIO_ACTIVE_HIGH>;
> + vin-supply = <&sw2_reg>;
> + enable-active-high;
If there is no consumer for this regulator, the regulator API will disable it.
It seems you need a 'regulator-always-on;'.
> + };
> +
>
> Anson.
>
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