From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751385AbcFCBWY (ORCPT ); Thu, 2 Jun 2016 21:22:24 -0400 Received: from mail-pf0-f178.google.com ([209.85.192.178]:34739 "EHLO mail-pf0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751182AbcFCBV7 (ORCPT ); Thu, 2 Jun 2016 21:21:59 -0400 From: Brian Norris To: Lee Jones , Thierry Reding , Olof Johansson Cc: , Doug Anderson , Brian Norris , linux-pwm@vger.kernel.org, devicetree@vger.kernel.org, Boris Brezillon , Stephen Barber , Javier Martinez Canillas , Benson Leung , Enric Balletbo , Randall Spangler , Shawn Nematbakhsh , Dmitry Torokhov , Todd Broch , Gwendal Grignou , Tomeu Vizoso , Brian Norris Subject: [PATCH v2 3/4] doc: dt: pwm: add binding for ChromeOS EC PWM Date: Thu, 2 Jun 2016 18:21:43 -0700 Message-Id: <1464916904-37554-4-git-send-email-briannorris@chromium.org> X-Mailer: git-send-email 2.8.0.rc3.226.g39d4020 In-Reply-To: <1464916904-37554-1-git-send-email-briannorris@chromium.org> References: <1464916904-37554-1-git-send-email-briannorris@chromium.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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