From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8FBFDC7618F for ; Mon, 15 Jul 2019 18:53:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5601220665 for ; Mon, 15 Jul 2019 18:53:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="MtPb6GlB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729568AbfGOSxJ (ORCPT ); Mon, 15 Jul 2019 14:53:09 -0400 Received: from fllv0016.ext.ti.com ([198.47.19.142]:34114 "EHLO fllv0016.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729513AbfGOSxJ (ORCPT ); Mon, 15 Jul 2019 14:53:09 -0400 Received: from lelv0266.itg.ti.com ([10.180.67.225]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id x6FIr0mh012362; Mon, 15 Jul 2019 13:53:00 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1563216780; bh=maWJWUl3/uh4gzm/FxDXx4PW89IhYMuhbL/zvUUoXWA=; h=Subject:To:CC:References:From:Date:In-Reply-To; b=MtPb6GlBSpe/QC6shP6MUsTHoj6yXZcQR8AF9vYp/Dhf4oN9RO0dHNKnHfGYLyLhd Grqo55U7QHukjPhAZa8GjuuRsMAhatqeBfUa1r3mK99MR/xnd7QJhw5S14Bibx0gOe kllcKbmwoEiXmp1QsipejvErZ9/QQQAQXsRZa7UQ= Received: from DLEE102.ent.ti.com (dlee102.ent.ti.com [157.170.170.32]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x6FIr0TA077200 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 15 Jul 2019 13:53:00 -0500 Received: from DLEE111.ent.ti.com (157.170.170.22) by DLEE102.ent.ti.com (157.170.170.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Mon, 15 Jul 2019 13:53:00 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DLEE111.ent.ti.com (157.170.170.22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Mon, 15 Jul 2019 13:53:00 -0500 Received: from [10.250.65.13] (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id x6FIqxE1072403; Mon, 15 Jul 2019 13:52:59 -0500 Subject: Re: [PATCH v2 1/2] dt-bindings: leds: document the "power-supply" property To: Jean-Jacques Hiblot , , , , , CC: , , References: <20190715155657.22976-1-jjhiblot@ti.com> <20190715155657.22976-2-jjhiblot@ti.com> From: Dan Murphy Message-ID: Date: Mon, 15 Jul 2019 13:52:58 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190715155657.22976-2-jjhiblot@ti.com> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-leds-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org JJ On 7/15/19 10:56 AM, Jean-Jacques Hiblot wrote: > Most of the LEDs are powered by a voltage/current regulator. Describing it > in the device-tree makes it possible for the LED core to enable/disable it > when needed. > > Signed-off-by: Jean-Jacques Hiblot > --- > Documentation/devicetree/bindings/leds/common.txt | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt > index 70876ac11367..539e124b1457 100644 > --- a/Documentation/devicetree/bindings/leds/common.txt > +++ b/Documentation/devicetree/bindings/leds/common.txt > @@ -61,6 +61,11 @@ Optional properties for child nodes: > - panic-indicator : This property specifies that the LED should be used, > if at all possible, as a panic indicator. > > +- power-supply : A voltage/current regulator used to to power the LED. When a Is the phandle to a voltage/current regulator used to to power the LED > + LED is turned off, the LED core disable its regulator. The The regulator is only disabled if it is the only consumer and/or the number of users = 0. > + same regulator can power many LED (or other) devices. It is > + turned off only when all of its users disabled it. > + > - trigger-sources : List of devices which should be used as a source triggering > this LED activity. Some LEDs can be related to a specific > device and should somehow indicate its state. E.g. USB 2.0 > @@ -106,6 +111,7 @@ gpio-leds { > label = "Status"; > linux,default-trigger = "heartbeat"; > gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>; > + power-supply = <&led_regulator>; > }; > > usb { Reviewed-by: Dan Murphy