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Subject: Re: [PATCH v4 1/3] dt-bindings: pwm: add MediaTek display PWM
 bindings
From: YH Huang <yh.huang@mediatek.com>
To: Daniel Kurtz <djkurtz@chromium.org>
CC: Matthias Brugger <matthias.bgg@gmail.com>,
        Mark Rutland <mark.rutland@arm.com>,
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Date: Thu, 9 Jul 2015 10:45:44 +0800
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On Wed, 2015-07-08 at 20:11 +0800, Daniel Kurtz wrote:
> On Mon, Jul 6, 2015 at 9:29 PM, YH Huang <yh.huang@mediatek.com> wrote:
> > Document the device-tree binding of MediatTek display PWM.
> > The PWM has one channel to control the backlight brightness for display.
> > It supports MT8173 and MT6595.
> >
> > Signed-off-by: YH Huang <yh.huang@mediatek.com>
> > ---
> >  .../devicetree/bindings/pwm/pwm-mtk-disp.txt       | 24 ++++++++++++++++++++++
> >  1 file changed, 24 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt
> >
> > diff --git a/Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt b/Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt
> > new file mode 100644
> > index 0000000..757b974
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt
> > @@ -0,0 +1,24 @@
> > +MediaTek display PWM controller
> > +
> > +Required properties:
> > + - compatible: should be "mediatek,<name>-disp-pwm"
> > +   - "mediatek,mt8173-disp-pwm": found on mt8173 SoC
> > +   - "mediatek,mt6595-disp-pwm": found on mt6595 SoC
> > + - reg: physical base address and length of the controller's registers
> > + - #pwm-cells: must be 2. See pwm.txt in this directory for a description of
> > +   the cell format
> > + - clocks: phandle and clock specifier of the PWM reference clock
> > + - clock-names: must contain the following
> > +   - "main": clock used to generate PWM signals
> > +   - "mm": sync signals from the modules of mmsys
> > +
> > +Example:
> > +       pwm0: pwm@1401e000 {
> > +               compatible = "mediatek,mt8173-disp-pwm",
> > +                            "mediatek,mt6595-disp-pwm";
> > +               reg = <0 0x1401e000 0 0x1000>;
> > +               #pwm-cells = <2>;
> > +               clocks = <&mmsys CLK_MM_DISP_PWM026M>,
> > +                        <&mmsys CLK_MM_DISP_PWM0MM>;
> > +               clock-names = "main", "mm";
> 
> Should we include the pinctrl settings here to enable the PWM output?
> 

Since we use pwm-backlight driver to control backlight, we should enable
PWM output in the backlight node.

Ref:
https://www.kernel.org/doc/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt

Regards,
YH Huang

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