Re: [PATCH 2/2] arm64: dts: rockchip: Add basic support for orion-r68

[Javier Martinez Canillas]

Hello Heiko,

On Fri, Jan 15, 2016 at 11:03 AM, Heiko Stuebner <heiko@xxxxxxxxx> wrote:
> Hi Javier,
>
> Am Freitag, 15. Januar 2016, 10:28:44 schrieb Javier Martinez Canillas:
>> This is not a complete review but I just wanted to comment on two
>> things that I noticed:
>
> same for me for now :-)
>
>
>> On Fri, Jan 15, 2016 at 10:06 AM, Matthias Brugger
>> <matthias.bgg@xxxxxxxxx> wrote:
>>
>> [snip]
>>
>> > +       };
>> > +
>> > +       vcc_18: vcc18-regulator {
>> > +               compatible = "regulator-fixed";
>> > +               regulator-name = "vcc_18";
>> > +               regulator-min-microvolt = <1800000>;
>> > +               regulator-max-microvolt = <1800000>;
>> > +               regulator-always-on;
>> > +               regulator-boot-on;
>> > +               vin-supply = <&vcc_sys>;
>> > +       };
>> > +
>> > +       /* supplies both host and otg */
>> > +       vcc_host: vcc-host-regulator {
>> > +               compatible = "regulator-fixed";
>> > +               gpio = <&gpio0 4 GPIO_ACTIVE_LOW>;
>> > +               pinctrl-names = "default";
>> > +               pinctrl-0 = <&host_vbus_drv>;
>> > +               regulator-name = "vcc_host";
>> > +               regulator-always-on;
>> > +               regulator-boot-on;
>> > +               vin-supply = <&vcc_sys>;
>> > +       };
>> > +
>> > +       vccio_sd: vcc-io-sd-regulator {
>> > +               regulator-name= "vccio_sd";
>> > +               gpio = <&gpio0 9 GPIO_ACTIVE_LOW>;
>> > +               regulator-min-microvolt = <3300000>;
>> > +               regulator-max-microvolt = <3300000>;
>> > +       };
>> > +
>> > +       vcc_sd: vcc-sd-regulator {
>> > +               compatible = "regulator-fixed";
>> > +               regulator-name = "vcc_sd";
>> > +               gpio = <&gpio3 11 GPIO_ACTIVE_LOW>;
>> > +               regulator-min-microvolt = <3300000>;
>> > +               regulator-max-microvolt = <3300000>;
>> > +               regulator-always-on;
>> > +               regulator-boot-on;
>> > +               vin-supply = <&vcc_io>;
>> > +       };
>> > +
>> > +       vcc_io: vcc-io-regulator {
>> > +               compatible = "regulator-fixed";
>> > +               regulator-name = "vcc_io";
>> > +               regulator-min-microvolt = <3300000>;
>> > +               regulator-max-microvolt = <3300000>;
>> > +               regulator-always-on;
>> > +               regulator-boot-on;
>> > +               vin-supply = <&vcc_sys>;
>> > +       };
>> > +
>> > +       vcc_lan: vcc-lan-regulator {
>> > +               compatible = "regulator-fixed";
>> > +               regulator-name = "vcc_lan";
>> > +               regulator-min-microvolt = <3300000>;
>> > +               regulator-max-microvolt = <3300000>;
>> > +               regulator-always-on;
>> > +               regulator-boot-on;
>> > +               vin-supply = <&vcc_io>;
>> > +       };
>> > +
>> > +       vcc_sys: vcc-sys-regulator {
>> > +               compatible = "regulator-fixed";
>> > +               regulator-name = "vcc_sys";
>> > +               regulator-min-microvolt = <5000000>;
>> > +               regulator-max-microvolt = <5000000>;
>> > +               regulator-always-on;
>> > +               regulator-boot-on;
>> > +       };
>> > +
>> > +       vccio_wl: vccio-wl-regulator {
>> > +               compatible = "regulator-fixed";
>> > +               regulator-name = "vccio_wl";
>> > +               regulator-min-microvolt = <3300000>;
>> > +               regulator-max-microvolt = <3300000>;
>> > +               regulator-always-on;
>> > +               regulator-boot-on;
>> > +               vin-supply = <&vcc_io>;
>> > +       };
>> > +
>> > +       vdd_10: vdd-10-regulator {
>> > +               compatible = "regulator-fixed";
>> > +               regulator-name = "vdd_10";
>> > +               regulator-min-microvolt = <1000000>;
>> > +               regulator-max-microvolt = <1000000>;
>> > +               regulator-always-on;
>> > +               regulator-boot-on;
>> > +               vin-supply = <&vcc_sys>;
>> > +       };
>> > +};
>>
>> There is only one regulator that is not marked as always-on. This will
>> prevent the regulator subsystem to disable unused regulators. Do you
>> really need all of them to be always-on?
>
> I do believe the regulators should be more or less correct. Sadly there are
> no real schematics for that specific device available, but the reference
> design for rk3368-based tv-boxes uses a hirarchy of hard-wired individual
> regulators without any ability to control for most of them [aka always on].
>
> And due to the r68 not sporting any different real pmic, I'd believe the
> Orion will most likely also follow that scheme.
>

I see, thanks a lot for the clarification. But then in that case I
wonder what's the point of defining the gpio property in the fixed
regulator device nodes?

>
> Heiko

Best regards,
Javier