Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1425413

[PATCH v3 3/4] doc: dt: pwm: add binding for ChromeOS EC PWM

Show all headers | View raw

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>
Acked-by: Rob Herring <robh@kernel.org>
---
v3:
 * add Rob's ack

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

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>;
+		};
+	};
-- 
2.8.0.rc3.226.g39d4020

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

[PATCH v3 0/4] pwm: add support for ChromeOS EC PWM Brian Norris <briannorris@chromium.org> - 2016-06-17 22:00 +0200
  [PATCH v3 1/4] mfd: cros_ec: Add cros_ec_cmd_xfer_status helper Brian Norris <briannorris@chromium.org> - 2016-06-17 22:00 +0200
    Re: [v3,1/4] mfd: cros_ec: Add cros_ec_cmd_xfer_status helper Guenter Roeck <linux@roeck-us.net> - 2016-06-17 23:50 +0200
      Re: [v3,1/4] mfd: cros_ec: Add cros_ec_cmd_xfer_status helper Brian Norris <briannorris@chromium.org> - 2016-06-18 03:10 +0200
        Re: [v3,1/4] mfd: cros_ec: Add cros_ec_cmd_xfer_status helper Guenter Roeck <linux@roeck-us.net> - 2016-06-18 06:20 +0200
          Re: [v3,1/4] mfd: cros_ec: Add cros_ec_cmd_xfer_status helper Brian Norris <briannorris@chromium.org> - 2016-06-20 19:40 +0200
        Re: [v3,1/4] mfd: cros_ec: Add cros_ec_cmd_xfer_status helper Guenter Roeck <linux@roeck-us.net> - 2016-06-18 19:20 +0200
          Re: [v3,1/4] mfd: cros_ec: Add cros_ec_cmd_xfer_status helper Javier Martinez Canillas <javier@osg.samsung.com> - 2016-06-20 15:50 +0200
            Re: [v3,1/4] mfd: cros_ec: Add cros_ec_cmd_xfer_status helper Brian Norris <briannorris@chromium.org> - 2016-06-20 19:50 +0200
              Re: [v3,1/4] mfd: cros_ec: Add cros_ec_cmd_xfer_status helper Javier Martinez Canillas <javier@osg.samsung.com> - 2016-06-20 20:30 +0200
              Re: [v3,1/4] mfd: cros_ec: Add cros_ec_cmd_xfer_status helper Brian Norris <briannorris@chromium.org> - 2016-06-20 22:10 +0200
  [PATCH v3 4/4] pwm: add ChromeOS EC PWM driver Brian Norris <briannorris@chromium.org> - 2016-06-17 22:00 +0200
  [PATCH v3 3/4] doc: dt: pwm: add binding for ChromeOS EC PWM Brian Norris <briannorris@chromium.org> - 2016-06-17 22:00 +0200

csiph-web