diff options
| author | Tony Prisk <linux@prisktech.co.nz> | 2013-01-02 20:44:16 +0100 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@avionic-design.de> | 2013-01-09 08:17:12 +0100 |
| commit | 3ccb1c1702ed4bb07006d20c8173899a69dae242 (patch) | |
| tree | ef55173274b60bec942b0dcfc15f1df3614029fe /Documentation | |
| parent | pwm: vt8500: Register write busy test performed incorrectly (diff) | |
| download | linux-3ccb1c1702ed4bb07006d20c8173899a69dae242.tar.xz linux-3ccb1c1702ed4bb07006d20c8173899a69dae242.zip | |
pwm: vt8500: Add polarity support
Add support to set polarity on PWM devices, allowing for inverted
duty cycles.
Also update the binding document to #pwm-cells = <3> to allow
passing the flags from devicetree.
Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/pwm/vt8500-pwm.txt | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/pwm/vt8500-pwm.txt b/Documentation/devicetree/bindings/pwm/vt8500-pwm.txt index bcc63678a9a5..d21d82d29855 100644 --- a/Documentation/devicetree/bindings/pwm/vt8500-pwm.txt +++ b/Documentation/devicetree/bindings/pwm/vt8500-pwm.txt @@ -3,14 +3,17 @@ VIA/Wondermedia VT8500/WM8xxx series SoC PWM controller Required properties: - compatible: should be "via,vt8500-pwm" - reg: physical base address and length of the controller's registers -- #pwm-cells: should be 2. The first cell specifies the per-chip index - of the PWM to use and the second cell is the period in nanoseconds. +- #pwm-cells: Should be 3. Number of cells being used to specify PWM property. + First cell specifies the per-chip 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. - clocks: phandle to the PWM source clock Example: pwm1: pwm@d8220000 { - #pwm-cells = <2>; + #pwm-cells = <3>; compatible = "via,vt8500-pwm"; reg = <0xd8220000 0x1000>; clocks = <&clkpwm>; |