| Message ID | 1464916904-37554-4-git-send-email-briannorris@chromium.org |
|---|---|
| State | Superseded |
| Headers | show |
On Thu, Jun 02, 2016 at 06:21:43PM -0700, Brian Norris wrote: > The ChromeOS Embedded Controller can support controlling its attached > PWMs via its host-command interface. The number of supported PWMs varies > on a per-board basis, but we can autodetect this by checking the error > codes, so we don't need an extra property for this. And because the EC > only allows specifying the duty cycle and not the period, we don't > specify the period via pwm-cells, and instead have only support 1 cell > -- to specify the index. > > Signed-off-by: Brian Norris <briannorris@chromium.org> > --- > v2: dropped the "google,max-pwms" property > > .../devicetree/bindings/pwm/google,cros-ec-pwm.txt | 23 ++++++++++++++++++++++ > 1 file changed, 23 insertions(+) > create mode 100644 Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.txt Acked-by: Rob Herring <robh@kernel.org> -- To unsubscribe from this list: send the line "unsubscribe linux-pwm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.txt b/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.txt new file mode 100644 index 000000000000..472bd46ab5a4 --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.txt @@ -0,0 +1,23 @@ +* PWM controlled by ChromeOS EC + +Google's ChromeOS EC PWM is a simple PWM attached to the Embedded Controller +(EC) and controlled via a host-command interface. + +An EC PWM node should be only found as a sub-node of the EC node (see +Documentation/devicetree/bindings/mfd/cros-ec.txt). + +Required properties: +- compatible: Must contain "google,cros-ec-pwm" +- #pwm-cells: Should be 1. The cell specifies the PWM index. + +Example: + cros-ec@0 { + compatible = "google,cros-ec-spi"; + + ... + + cros_ec_pwm: ec-pwm { + compatible = "google,cros-ec-pwm"; + #pwm-cells = <1>; + }; + };
The ChromeOS Embedded Controller can support controlling its attached PWMs via its host-command interface. The number of supported PWMs varies on a per-board basis, but we can autodetect this by checking the error codes, so we don't need an extra property for this. And because the EC only allows specifying the duty cycle and not the period, we don't specify the period via pwm-cells, and instead have only support 1 cell -- to specify the index. Signed-off-by: Brian Norris <briannorris@chromium.org> --- v2: dropped the "google,max-pwms" property .../devicetree/bindings/pwm/google,cros-ec-pwm.txt | 23 ++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.txt