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authorYH Huang2015-08-18 02:27:53 -0500
committerThierry Reding2015-10-06 09:07:29 -0500
commit3e9e6c28d287a4a2dc62f61cf67654bdae374992 (patch)
tree9510b939c68a63cdcffa671f89afe0d7664d48f1 /Documentation/devicetree
parent25ebc9ec162d64ab38a813dac01c5322ebbcfcfa (diff)
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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>
Diffstat (limited to 'Documentation/devicetree')
-rw-r--r--Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt42
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diff --git a/Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt b/Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt
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1MediaTek display PWM controller
2
3Required properties:
4 - compatible: should be "mediatek,<name>-disp-pwm":
5 - "mediatek,mt8173-disp-pwm": found on mt8173 SoC.
6 - "mediatek,mt6595-disp-pwm": found on mt6595 SoC.
7 - reg: physical base address and length of the controller's registers.
8 - #pwm-cells: must be 2. See pwm.txt in this directory for a description of
9 the cell format.
10 - clocks: phandle and clock specifier of the PWM reference clock.
11 - clock-names: must contain the following:
12 - "main": clock used to generate PWM signals.
13 - "mm": sync signals from the modules of mmsys.
14 - pinctrl-names: Must contain a "default" entry.
15 - pinctrl-0: One property must exist for each entry in pinctrl-names.
16 See pinctrl/pinctrl-bindings.txt for details of the property values.
17
18Example:
19 pwm0: pwm@1401e000 {
20 compatible = "mediatek,mt8173-disp-pwm",
21 "mediatek,mt6595-disp-pwm";
22 reg = <0 0x1401e000 0 0x1000>;
23 #pwm-cells = <2>;
24 clocks = <&mmsys CLK_MM_DISP_PWM026M>,
25 <&mmsys CLK_MM_DISP_PWM0MM>;
26 clock-names = "main", "mm";
27 pinctrl-names = "default";
28 pinctrl-0 = <&disp_pwm0_pins>;
29 };
30
31 backlight_lcd: backlight_lcd {
32 compatible = "pwm-backlight";
33 pwms = <&pwm0 0 1000000>;
34 brightness-levels = <
35 0 16 32 48 64 80 96 112
36 128 144 160 176 192 208 224 240
37 255
38 >;
39 default-brightness-level = <9>;
40 power-supply = <&mt6397_vio18_reg>;
41 enable-gpios = <&pio 95 GPIO_ACTIVE_HIGH>;
42 };