From patchwork Fri Feb 16 17:40:31 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: 10225263 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3C8BC602CB for ; Fri, 16 Feb 2018 17:41:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2C46C286E4 for ; Fri, 16 Feb 2018 17:41:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 20FC42960A; Fri, 16 Feb 2018 17:41:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A2582286E4 for ; Fri, 16 Feb 2018 17:41:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1162312AbeBPRkr (ORCPT ); Fri, 16 Feb 2018 12:40:47 -0500 Received: from bhuna.collabora.co.uk ([46.235.227.227]:34404 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1162279AbeBPRkp (ORCPT ); Fri, 16 Feb 2018 12:40:45 -0500 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: eballetbo) with ESMTPSA id 7A08F271FE7 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, kernel@collabora.com Subject: [RESEND PATCH v5 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties. Date: Fri, 16 Feb 2018 18:40:31 +0100 Message-Id: <20180216174034.15936-2-enric.balletbo@collabora.com> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20180216174034.15936-1-enric.balletbo@collabora.com> References: <20180216174034.15936-1-enric.balletbo@collabora.com> Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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: Daniel Thompson Acked-by: Thierry Reding --- Based on the original Huang Lin work. 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>; };