Hi,
On Wed, Oct 29, 2014 at 09:13:50PM +0100, Roman Byshko wrote:
> Hi Maxime,
>
> thank you for the review!
>
> On Tue, Oct 28, 2014 at 10:51 PM, Maxime Ripard
> <maxime.ripard@xxxxxxxxxxxxxxxxxx> wrote:
> > On Mon, Oct 27, 2014 at 10:43:02PM +0100, Roman Byshko wrote:
> >> Until now the regulator nodes for powering USB VBUS
> >> existed only for the two host controllers. Now the regulator
> >> is added for USB OTG too.
> >> ---
> >> arch/arm/boot/dts/sunxi-common-regulators.dtsi | 19 +++++++++++++++++++
> >> 1 file changed, 19 insertions(+)
> >>
> >> diff --git a/arch/arm/boot/dts/sunxi-common-regulators.dtsi b/arch/arm/boot/dts/sunxi-common-regulators.dtsi
> >> index c9c5b10..f521672 100644
> >> --- a/arch/arm/boot/dts/sunxi-common-regulators.dtsi
> >> +++ b/arch/arm/boot/dts/sunxi-common-regulators.dtsi
> >> @@ -21,6 +21,13 @@
> >> allwinner,pull = <0>;
> >> };
> >>
> >> + usb0_vbus_pin_a: usb0_vbus_pin@0 {
> >> + allwinner,pins = "PB9";
> >> + allwinner,function = "gpio_out";
> >> + allwinner,drive = <0>;
> >> + allwinner,pull = <0>;
> >> + };
> >> +
> >> usb1_vbus_pin_a: usb1_vbus_pin@0 {
> >> allwinner,pins = "PH6";
> >> allwinner,function = "gpio_out";
> >> @@ -49,6 +56,18 @@
> >> status = "disabled";
> >> };
> >>
> >> + reg_usb0_vbus: usb0-vbus {
> >> + compatible = "regulator-fixed";
> >> + pinctrl-names = "default";
> >> + pinctrl-0 = <&usb0_vbus_pin_a>;
> >> + regulator-name = "usb0-vbus";
> >> + regulator-min-microvolt = <5000000>;
> >> + regulator-max-microvolt = <5000000>;
> >> + enable-active-high;
> >> + gpio = <&pio 1 9 0>;
> >> + status = "disabled";
> >> + };
> >
> > We're using these regulators because a huuuge majority of the boards
> > out there, regardless of their SoC, are using the same GPIO to drive
> > the same regulator. Is this the case here? What board have you looked
> > at?
>
> Currently I'm developing and testing for Cubietruck. I also have a few
> other boards (with different SoC), I will add corresponding DT nodes
> for them later.
>
> As for GPIO which is used to drive the USB0 VBUS pin.
>
> $ git remote show origin
> * remote origin
> Fetch URL: https://github.com/linux-sunxi/sunxi-boards.git
> Push URL: https://github.com/linux-sunxi/sunxi-boards.git
> ...
> $ grep -A7 usbc0 -r . | grep usb_drv_vbus_gpio | grep port | sort |
> cut -d: -f2 | cut -d "<" -f1 | sort | uniq -c
> 1 PA16
> 1 PA17
> 67 PB09
> 4 PB10
> 1 PB9
> 1 PC17
> 1 PD25
> 4 PG11
> 21 PG12
> 1 PG13
> 1 PH17
> 4 power4
>
> So PB09 is most often used. PG12 is used on (alsmost always) A13. So
> propose to make PB09 default, then override it in sun5i-a13.dtsi and
> later in board dts file if needed.
>
> Cubietruck uses PH17. That is why I override PB09 in its dts file.
>
> Sounds good?
It does :)
Thanks!
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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