From patchwork Mon Jul 17 21:28:08 2017 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: 9846317 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 D716760392 for ; Mon, 17 Jul 2017 21:28:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 180DB26E4A for ; Mon, 17 Jul 2017 21:28:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0CAC227F81; Mon, 17 Jul 2017 21:28:56 +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=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id AE42126E4A for ; Mon, 17 Jul 2017 21:28:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=fufBnxem0KgvcwijU+kzoQakdLsyRTjW+AsbctdAI3U=; b=dW3CGo9tLcelmaJS2tDHlxj79l vjYNv+eIijZ/okjDYtuFaX9Kv5EDRX3uDLiENHm7UY2jTSGZZEbTZnp2TQwVOQ89At8RQKn2wh8WF M/Rb1nTe8Ea+113vYwnSlYrS2MxWsogdbWT1XcXVDiTvP7FmId4iXgW0M5KdesB7GjToa6uQu5SdB I+dRuohUzuUDo0Yvnri5uNwu5uGpBoFK2vLN5dbCf6X15Oi43L1LK66DsgguxeVW3u2i0Uncri/i/ xs95B1iDZF7KRpW1hnUUyPPQ7KE9XaC/3z72WTavx1/U38j6G/A5OCgdFvfzAdEUkDD2E5zC6dtwT byVaSNFQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dXDZX-0002tI-5V; Mon, 17 Jul 2017 21:28:55 +0000 Received: from bhuna.collabora.co.uk ([46.235.227.227]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1dXDZR-0002jX-Iv for linux-rockchip@lists.infradead.org; Mon, 17 Jul 2017 21:28:53 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: eballetbo) with ESMTPSA id E84BC260E54 From: Enric Balletbo i Serra To: Thierry Reding , Lee Jones , Daniel Thompson , Jingoo Han , Bartlomiej Zolnierkiewicz , Rob Herring , Pavel Machek , Richard Purdie , Jacek Anaszewski , Heiko Stuebner Subject: [PATCH v3 2/5] dt-bindings: pwm-backlight: add PWM delay proprieties. Date: Mon, 17 Jul 2017 23:28:08 +0200 Message-Id: <20170717212811.25374-2-enric.balletbo@collabora.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170717212811.25374-1-enric.balletbo@collabora.com> References: <20170717212811.25374-1-enric.balletbo@collabora.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170717_142849_774112_46575B77 X-CRM114-Status: UNSURE ( 7.23 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: groeck@chromium.org, linux-pwm@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org MIME-Version: 1.0 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+patchwork-linux-rockchip=patchwork.kernel.org@lists.infradead.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-us specifies this delay in micro seconds. Hardware also needs a delay between disabing the backlight using GPIO and setting PWM value to 0. The pwm-off-delay-us is this delay in micro seconds. Signed-off-by: Enric Balletbo i Serra Acked-by: Pavel Machek --- Based on the original Huang Lin work. 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 764db86..810527c 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-us: Delay in us between setting an initial (non-zero) PWM + and enabling the backlight using GPIO. + - pwm-off-delay-us: Delay in us 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-us = <10000>; + pwm-off-delay-us = <10000>; };