Signed-off-by: Xiubo Li <Li.Xiubo@xxxxxxxxxxxxx> --- .../devicetree/bindings/pwm/fsl-ftm-pwm.txt | 52 ++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/fsl-ftm-pwm.txt diff --git a/Documentation/devicetree/bindings/pwm/fsl-ftm-pwm.txt b/Documentation/devicetree/bindings/pwm/fsl-ftm-pwm.txt new file mode 100644 index 0000000..698965b --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/fsl-ftm-pwm.txt @@ -0,0 +1,52 @@ +Freescale FTM PWM controller + +Required properties: +- compatible: should be "fsl,vf610-ftm-pwm" +- reg: physical base address and length of the controller's registers +- #pwm-cells: Should be 3. Number of cells being used to specify PWM property. + First cell specifies the per-chip channel index of the PWM to use, the + second cell is the period in nanoseconds and bit 0 in the third cell is + used to encode the polarity of PWM output. Set bit 0 of the third in PWM + specifier to 1 for inverse polarity & set to 0 for normal polarity. +- fsl,pwm-clk-ps: the ftm0 pwm clock's prescaler, divide-by 2^n(n = 0 ~ 7). +- fsl,pwm-cpwm: Center-Aligned PWM (CPWM) mode. +- fsl,pwm-number: the number of PWM devices, and is must equal to the number + of "fsl,pwm-channels". +- fsl,pwm-channels: the channels' order which is be used for pwm in ftm0 + module, and they must be one or some of 0 ~ 7, because the ftm0 only has + 8 channels can be used. +- for very channel, the revlatived the pinctrl should be at least two state + {"enN", "dsN"}, which "en" means "enable", "ds" means "disable" and "N" + means the order of the channel. + +Example: + +pwm0: pwm@40038000 { + compatible = "fsl,vf610-ftm-pwm"; + reg = <0x40038000 0x1000>; + #pwm-cells = <3>; + pinctrl-names = "en0", "ds0", "en3", "ds3"; + pinctrl-0 = <&pinctrl_pwm0_ch0_en>; + pinctrl-1 = <&pinctrl_pwm0_ch0_ds>; + pinctrl-2 = <&pinctrl_pwm0_ch3_en>; + pinctrl-3 = <&pinctrl_pwm0_ch3_ds>; + fsl,pwm-clk-ps = <7>; + fsl,pwm-cpwm = <0>; + fsl,pwm-number = <2>; + fsl,pwm-channels = <0 3>; + ... + }; + +leds { + compatible = "pwm-leds"; + led { + label = "fsl_led"; + pwms = <&pwm0 0 10000000 0>; + max-brightness = <127>; + }; + backlight { + label = "fsl_backlight"; + pwms = <&pwm0 3 10000000 1>; + max-brightness = <100>; + }; +}; -- 1.8.0 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html