From patchwork Wed Mar 28 17:03:24 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Enric Balletbo i Serra X-Patchwork-Id: 892386 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=collabora.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 40BDl24vVHz9s0R for ; Thu, 29 Mar 2018 04:04:46 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753467AbeC1REh (ORCPT ); Wed, 28 Mar 2018 13:04:37 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:48756 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752584AbeC1RDh (ORCPT ); Wed, 28 Mar 2018 13:03:37 -0400 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: eballetbo) with ESMTPSA id C437F275F05 From: Enric Balletbo i Serra To: Lee Jones , Daniel Thompson , Jingoo Han , Rob Herring , Pavel Machek , Heiko Stuebner Cc: Thierry Reding , Bartlomiej Zolnierkiewicz , Richard Purdie , Jacek Anaszewski , linux-pwm@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, groeck@chromium.org, linux-rockchip@lists.infradead.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, kernel@collabora.com Subject: [RESEND PATCH v6 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties. Date: Wed, 28 Mar 2018 19:03:24 +0200 Message-Id: <20180328170327.5395-2-enric.balletbo@collabora.com> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180328170327.5395-1-enric.balletbo@collabora.com> References: <20180328170327.5395-1-enric.balletbo@collabora.com> Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org Hardware needs a delay between setting an initial (non-zero) PWM and enabling the backlight using GPIO. The post-pwm-on-delay-ms specifies this delay in milli seconds. Hardware also needs a delay between disabing the backlight using GPIO and setting PWM value to 0. The pwm-off-delay-ms is this delay in milli seconds. Signed-off-by: Enric Balletbo i Serra Acked-by: Pavel Machek Acked-by: Thierry Reding Acked-by: Daniel Thompson Reviewed-by: Rob Herring --- Based on the original Huang Lin work. Changes since v5: - Add Acked-by: Thierry Reding - CC DT mainling list (for some reason dropped at some point, my fault) Changes since v4: - Rebase on top of mainline. Changes since v3: - Replace us for ms. - Add Acked-by: Pavel Machek Changes since v2: - Use separate properties (Rob Herring) Changes since v1: - As suggested by Daniel Thompson - Do not assume power-on delay and power-off delay will be the same --- Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt index 764db86d441a..310810906613 100644 --- a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt +++ b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt @@ -17,6 +17,10 @@ Optional properties: "pwms" property (see PWM binding[0]) - enable-gpios: contains a single GPIO specifier for the GPIO which enables and disables the backlight (see GPIO binding[1]) + - post-pwm-on-delay-ms: Delay in ms between setting an initial (non-zero) PWM + and enabling the backlight using GPIO. + - pwm-off-delay-ms: Delay in ms between disabling the backlight using GPIO + and setting PWM value to 0. [0]: Documentation/devicetree/bindings/pwm/pwm.txt [1]: Documentation/devicetree/bindings/gpio/gpio.txt @@ -32,4 +36,6 @@ Example: power-supply = <&vdd_bl_reg>; enable-gpios = <&gpio 58 0>; + post-pwm-on-delay-ms = <10>; + pwm-off-delay-ms = <10>; };