On 09/12/2013 11:58 PM, Xiubo Li wrote:
> This adds the Document for Freescale FTM PWM driver under
> Documentation/devicetree/bindings/pwm/.
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-fsl-ftm.txt b/Documentation/devicetree/bindings/pwm/pwm-fsl-ftm.txt
> +Required properties:
> +- clock-names : Includes the following module clock source entries:
> + "ftm0" (system clock),
> + "ftm0_fix_sel" (fixed frequency clock),
> + "ftm0_ext_sel" (external clock)
> +- clocks : Must contain an entry list for entries in clock-names.
s/an entry list/a clock specifier/
s/for entries/for each entry/
> +- fsl,pwm-counter-clk: The FTM PWM counter clock source, should be one of the
> + entries in clock-names.
So the IP block has 3 input clocks, and also a mux to select which one
to use? That sounds slightly unusual, but possible.
If there is really only 1 clock input to the IP block, and the mux is
part of some other module, then this binding should have only 1 entry in
clocks.
> +- For each channel's pinctrl, the "chN-active" and "chN-idle" states should be
> + implemented at the same time.
I still don't believe that multiple pinctrl states active at once is
something that the pinctrl bindings conceptually support. CC+=LinusW, do
we want to allow this?
Assuming this is allowed, you'd want to write something more like the
following:
pinctrl-names: Must include "chN-active" and "chN-idle" for each channel
ID N in range 0..7.
pinctrl-NNN: One property must exist for each entry in pinctrl-names.
See ../pinctrl/pinctrl-bindings.txt for details of the property values.
> +Example:
> +
> +pwm0: pwm@40038000 {
> + compatible = "fsl,vf610-ftm-pwm";
> + reg = <0x40038000 0x1000>;
> + #pwm-cells = <3>;
> + clock-names = "ftm0", "ftm0_fix_sel", "ftm0_ext_sel";
> + clocks = <&clks VF610_CLK_FTM0>,
> + <&clks VF610_CLK_FTM0_FIX_SEL>,
> + <&clks VF610_CLK_FTM0_EXT_SEL>;
> + pinctrl-names = "ch0-active", "ch0-idle", "ch1-active", "ch1-idle",
> + ....;
> + pinctrl-0 = <&pinctrl_pwm0_ch0_active>;
> + pinctrl-1 = <&pinctrl_pwm0_ch0_idle>;
> + pinctrl-2 = <&pinctrl_pwm0_ch1_active>;
> + pinctrl-3 = <&pinctrl_pwm0_ch1_idle>;
> + ...
> + fsl,pwm-counter-clk = "ftm0_ext_sel";
> +};
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