2014-07-16 10:01 GMT+08:00 Huayi Li <huayi.li@xxxxxxx>:
> This patch adds dt-binding document for pwm-sirf. here the controller clock
> can't generate PWM signals, so we need seperate clock as signal source.
>
> Signed-off-by: Huayi Li <huayi.li@xxxxxxx>
Reviewed-by: Barry Song <Baohua.Song@xxxxxxx>
except that the commit log has not explained enough clearly that every
pwm channel can choice one from five clock sources to generate PWM
wave.
> ---
> Documentation/devicetree/bindings/pwm/pwm-sirf.txt | 29 ++++++++++++++++++++++
> 1 file changed, 29 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pwm/pwm-sirf.txt
>
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-sirf.txt b/Documentation/devicetree/bindings/pwm/pwm-sirf.txt
> new file mode 100644
> index 0000000..221e5d9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/pwm-sirf.txt
> @@ -0,0 +1,29 @@
> +SiRF prima2 & atlas6 PWM drivers
> +
> +Required properties:
> +- compatible: "sirf,prima2-pwm"
> +- reg: physical base address and length of the controller's registers
> +- #pwm-cells: should be 2. See pwm.txt in this directory for a description of
> + the cells format.
> +- clocks: Must contain an entry for each entry in clock-names.
> + See ../clock/prima2-clock.txt for details.
> +- clock-names: Must include the following entries:
> + of clock sources to generate PWM signal,
> + - pwmc: PWM controller clock
> + - sigsrc0: source clock 0 for PWM
> + - sigsrc1: source clock 1 for PWM
> + - sigsrc2: source clock 2 for PWM
> + - sigsrc3: source clock 3 for PWM
> + - sigsrc4: source clock 4 for PWM
> +
> +Example:
> +
> +pwm: pwm@b0130000 {
> + compatible = "sirf,prima2-pwm";
> + #pwm-cells = <2>;
> + reg = <0xb0130000 0x10000>;
> + clocks = <&clks 21>, <&clks 1>, <&clks 2>,
> + <&clks 3>, <&clks 0>, <&clks 4>;
> + clock-names = "pwmc", "sigsrc0", "sigsrc1",
> + "sigsrc2", "sigsrc3", "sigsrc4";
> +};
> --
> 1.9.3
>
-barry
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