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| author | YH Huang <yh.huang@mediatek.com> | 2015-08-18 10:27:53 +0300 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2015-10-06 17:07:29 +0300 |
| commit | 3e9e6c28d287a4a2dc62f61cf67654bdae374992 (patch) | |
| tree | 9510b939c68a63cdcffa671f89afe0d7664d48f1 | |
| parent | 25ebc9ec162d64ab38a813dac01c5322ebbcfcfa (diff) | |
| download | linux-3e9e6c28d287a4a2dc62f61cf67654bdae374992.tar.xz | |
dt-bindings: pwm: Add MediaTek display PWM bindings
Document the device-tree binding of MediaTek display PWM. The PWM has
one channel to control the backlight brightness for display. Both the
MT8173 and MT6595 are supported.
Signed-off-by: YH Huang <yh.huang@mediatek.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
| -rw-r--r-- | Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt | 42 |
1 files changed, 42 insertions, 0 deletions
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 000000000000..f8f59baf6b67 --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt @@ -0,0 +1,42 @@ +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. + - pinctrl-names: Must contain a "default" entry. + - pinctrl-0: One property must exist for each entry in pinctrl-names. + See pinctrl/pinctrl-bindings.txt for details of the property values. + +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"; + pinctrl-names = "default"; + pinctrl-0 = <&disp_pwm0_pins>; + }; + + backlight_lcd: backlight_lcd { + compatible = "pwm-backlight"; + pwms = <&pwm0 0 1000000>; + brightness-levels = < + 0 16 32 48 64 80 96 112 + 128 144 160 176 192 208 224 240 + 255 + >; + default-brightness-level = <9>; + power-supply = <&mt6397_vio18_reg>; + enable-gpios = <&pio 95 GPIO_ACTIVE_HIGH>; + }; |