diff options
author | Brian Norris <briannorris@chromium.org> | 2016-07-15 16:28:43 -0700 |
---|---|---|
committer | Thierry Reding <thierry.reding@gmail.com> | 2016-07-25 10:39:36 +0200 |
commit | 9e60f50b4a79ae2df791d89d08cf2b78ad7629bd (patch) | |
tree | bee8d37f05bf139f38e1e0f52c5fc8458ca3a673 /Documentation/devicetree/bindings | |
parent | 38593426ecc7e0e22873dcd7b5d471eb869a0b6e (diff) | |
download | blackbird-op-linux-9e60f50b4a79ae2df791d89d08cf2b78ad7629bd.tar.gz blackbird-op-linux-9e60f50b4a79ae2df791d89d08cf2b78ad7629bd.zip |
dt-bindings: pwm: Add binding for ChromeOS EC PWM
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 for one
cell -- to specify the index.
Signed-off-by: Brian Norris <briannorris@chromium.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'Documentation/devicetree/bindings')
-rw-r--r-- | Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.txt | 23 |
1 files changed, 23 insertions, 0 deletions
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>; + }; + }; |