From patchwork Fri Mar 10 06:55:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: ChiaEn Wu X-Patchwork-Id: 13168802 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E87B3C64EC4 for ; Fri, 10 Mar 2023 06:58:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=OeO3Tr/nGk2LrAkbk5qBYm0b1qpB7VZq4L450jXnOTk=; b=pX1zjjX4+EtmX1 QmFhms+arY/647JZYExvQBLApsrXPASFJZvOkBLkxKRkmWx6QQLPl18IYWEF5pg+oimAwp5Gu+Z0G nYiJfScn24SDcy/mrBKHffgz2zwP6ceYyP+CL9dfeprnNmF09hHRpNGkzCZoQzrfk/gYnJUXCnQb4 jOGoUSK+JMimZMXzc/HqneG8VzVUflHWmM7xOAwswpeE6CpF+8AkaU9TdYw+85YU9GHziLMJ1JUPq qKcRWi/YcQACotUc4Q8Pd++gtngVSCXfa8PNsB8tqeui+g6AxZtSfe0k09qP9EkB33p97BC5hGD37 UrJmQNTDjNzifsNz6mZw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1paWgQ-00DJH2-8R; Fri, 10 Mar 2023 06:56:54 +0000 Received: from mg.richtek.com ([220.130.44.152]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1paWgK-00DJBX-5W; Fri, 10 Mar 2023 06:56:51 +0000 X-MailGates: (flag:4,DYNAMIC,BADHELO,RELAY,NOHOST:PASS)(compute_score:DE LIVER,40,3) Received: from 192.168.10.46 by mg.richtek.com with MailGates ESMTP Server V5.0(20043:0:AUTH_RELAY) (envelope-from ); Fri, 10 Mar 2023 14:56:02 +0800 (CST) Received: from ex3.rt.l (192.168.10.46) by ex3.rt.l (192.168.10.46) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.25; Fri, 10 Mar 2023 14:56:02 +0800 Received: from linuxcarl2.richtek.com (192.168.10.154) by ex3.rt.l (192.168.10.45) with Microsoft SMTP Server id 15.2.1118.25 via Frontend Transport; Fri, 10 Mar 2023 14:56:02 +0800 From: ChiaEn Wu To: , , , , , , CC: , , , , , , , , ChiaEn Wu Subject: [PATCH v18 3/3] docs: leds: Add MT6370 RGB LED pattern document Date: Fri, 10 Mar 2023 14:55:57 +0800 Message-ID: <38f1e863b0f099158a63fb6f95056a1cb30d80a0.1678430444.git.chiaen_wu@richtek.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230309_225648_662594_5C574DDF X-CRM114-Status: GOOD ( 12.21 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: ChiYuan Huang Document the MT6370 RGB LED pattern trigger. This simply describe how the pattern works, each timing period, and the pattern diagram for MT6370 RGB LED. Signed-off-by: ChiYuan Huang Signed-off-by: ChiaEn Wu --- v18: - Revise the text in document title and description. --- Documentation/leds/leds-mt6370-rgb.rst | 64 ++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 Documentation/leds/leds-mt6370-rgb.rst diff --git a/Documentation/leds/leds-mt6370-rgb.rst b/Documentation/leds/leds-mt6370-rgb.rst new file mode 100644 index 00000000..abf739e --- /dev/null +++ b/Documentation/leds/leds-mt6370-rgb.rst @@ -0,0 +1,64 @@ +.. SPDX-License-Identifier: GPL-2.0 + +========================================= +The device for Mediatek MT6370 RGB LED +========================================= + +Description +----------- + +The MT6370 integrates a four-channel RGB LED driver, designed to provide a +variety of lighting effect for mobile device applications. The RGB LED devices +includes a smart LED string controller and it can drive 3 channels of LEDs with +a sink current up to 24mA and a CHG_VIN power good indicator LED with sink +current up to 6mA. It provides three operation modes for RGB LEDs: +PWM Dimming mode, breath pattern mode, and constant current mode. The device +can increase or decrease the brightness of the RGB LED via an I2C interface. + +The breath pattern for a channel can be programmed using the "pattern" trigger, +using the hw_pattern attribute. + +/sys/class/leds//hw_pattern +-------------------------------- + +Specify a hardware breath pattern for a MT6370 RGB LED. + +The breath pattern is a series of timing pairs, with the hold-time expressed in +milliseconds. And the brightness is controlled by +'/sys/class/leds//brightness'. The pattern doesn't include the brightness +setting. Hardware pattern only controls the timing for each pattern stage +depending on the current brightness setting. + +Pattern diagram:: + + "0 Tr1 0 Tr2 0 Tf1 0 Tf2 0 Ton 0 Toff" --> '0' for dummy brightness code + + ^ + | ============ + | / \ / +Icurr | / \ / + | / \ / + | / \ / .....repeat + | / \ / + | --- --- --- + |--- --- --- + +----------------------------------============------------> Time + < Tr1>< Ton >< Toff >< Tr1> + +Timing description:: + +Tr1: First rising time for duty 0 to 30%. +Tr2: Second rising time for duty 31% to 100%. +Ton: On time for duty 100%. +Tf1: First falling time for duty 100% to 31%. +Tf2: Second falling time for duty 30% to 0%. +Toff: Off time for duty 0%. + +Tr1/Tr2/Tf1/Tf2/Ton: 125ms to 3125ms, 200ms per step. +Toff: 250ms to 6250ms, 400ms per step. + +Pattern example:: + + "0 125 0 125 0 125 0 125 0 625 0 1050" + +This Will configure Tr1/Tr2/Tf1/Tf2 to 125m, Ton to 625ms, and Toff to 1050ms.