Commit 9e60f50b authored Jul 15, 2016 by Brian Norris Committed by Thierry Reding Jul 25, 2016

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>

parent 38593426

Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.txt

0 → 100644

+23 −0

Original line number	Diff line number	Diff line
		* 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>;
		};
		};

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