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[2620:137:e000::1:20]) by mx.google.com with ESMTP id z31-20020a63191f000000b00514442657adsi15926715pgl.547.2023.04.26.02.41.22; Wed, 26 Apr 2023 02:41:38 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=UN9smnlg; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240348AbjDZJdo (ORCPT + 99 others); Wed, 26 Apr 2023 05:33:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57110 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240299AbjDZJdj (ORCPT ); Wed, 26 Apr 2023 05:33:39 -0400 Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7997D1702 for ; Wed, 26 Apr 2023 02:33:38 -0700 (PDT) Received: by mail-pg1-x536.google.com with SMTP id 41be03b00d2f7-517bb01bac9so4929183a12.0 for ; Wed, 26 Apr 2023 02:33:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1682501618; x=1685093618; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=uvPQ+p6p7LPXccnkrXRgDzY3F78Ex853x9Swf3yMEqY=; b=UN9smnlgDaW5ESWDJZoeDD7OlyBxrsIf28fmOhRxgm4lMwF6p8cR8ZIYRXZbuDIspr YybIhG7VpOorRriLB+GvVyUHM/p1Hb6FjJ+OLjzchNz19jZmWkbZgywjgs17uqCMeIlf fA4mCMYzACCi0X1GaK4qaVvMvfnlCYLoP87mI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682501618; x=1685093618; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=uvPQ+p6p7LPXccnkrXRgDzY3F78Ex853x9Swf3yMEqY=; b=W2533xQljCVv5gB390zGF2Riw2/9JsKUD5CWemfD5RogpMpbLE7VvbRNr4dLapCdJU BOI+LZRLWytsjicLKL3Avb+q4FKBneiJKQwlFm1RFTy5NuF9vR1QmmZGQB9btndnR3+N fkHe2i7RA7PFwxcHoXl7vwowAeuzNimTMSjsZlJjrfC1L6NzyBz7/zYNFD3G6wMJcenM VU8H+ahdNfkj7WVFwS8BrbYKSNrIMAlG3tu6mXHb2JJVVxo9jEDgXOlep8eyRjn8abuV YP7Crtq4uH/ZkexXMSLXxtOOjISw+1PbYjareEElNfvFn+T/FbQnehfg3ae7ybm17yQG BhUw== X-Gm-Message-State: AAQBX9eqQUx9cgiVb4uTwLg0NyqJHR7NuQMvtymshZtXUfB9w1YjbSHP qEDuFUXPU/8qV7QCc7szNyRuOA== X-Received: by 2002:a05:6a20:7350:b0:f2:745a:b87e with SMTP id v16-20020a056a20735000b000f2745ab87emr22849547pzc.12.1682501617975; Wed, 26 Apr 2023 02:33:37 -0700 (PDT) Received: from fshao-glinux.tpe.corp.google.com ([2401:fa00:1:10:dcf6:797f:140d:6d]) by smtp.gmail.com with ESMTPSA id g1-20020a056a00078100b005810c4286d6sm10730075pfu.0.2023.04.26.02.33.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Apr 2023 02:33:37 -0700 (PDT) From: Fei Shao To: Jeff LaBundy , Douglas Anderson , Benjamin Tissoires , Rob Herring Cc: linux-mediatek , Fei Shao , Matthias Brugger , Dmitry Torokhov , Krzysztof Kozlowski , devicetree@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/2] dt-bindings: input: goodix: Add "goodix,no-reset-during-suspend" property Date: Wed, 26 Apr 2023 17:32:29 +0800 Message-ID: <20230426093231.1466984-2-fshao@chromium.org> X-Mailer: git-send-email 2.40.1.495.gc816e09b53d-goog In-Reply-To: <20230426093231.1466984-1-fshao@chromium.org> References: <20230426093231.1466984-1-fshao@chromium.org> MIME-Version: 1.0 X-Spam-Status: No, score=-2.3 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1764231320898177061?= X-GMAIL-MSGID: =?utf-8?q?1764231320898177061?= We observed that on Chromebook device Steelix, if Goodix GT7375P touchscreen is powered in suspend (because, for example, it connects to an always-on regulator) and with the reset GPIO asserted, it will introduce about 14mW power leakage. To address that, we add this property to skip reset during suspend. If it's set, the driver will stop asserting the reset GPIO during power-down. Refer to the comments in the driver for details. Signed-off-by: Fei Shao Reviewed-by: Douglas Anderson Reviewed-by: Matthias Brugger --- Changes in v2: - Use a more accurate property name and with "goodix," prefix. .../devicetree/bindings/input/goodix,gt7375p.yaml | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml b/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml index ce18d7dadae2..1edad1da1196 100644 --- a/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml +++ b/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml @@ -43,6 +43,15 @@ properties: itself as long as it allows the main board to make signals compatible with what the touchscreen is expecting for its IO rails. + goodix,no-reset-during-suspend: + description: + Set this to true to enforce the driver to not assert the reset GPIO + during suspend. + Due to potential touchscreen hardware flaw, back-powering could happen in + suspend if the power supply is on and with active-low reset GPIO asserted. + This property is used to avoid the back-powering issue. + type: boolean + required: - compatible - reg