From nobody Sat Sep 21 00:05:47 2024 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5D061C77B76 for ; Tue, 18 Apr 2023 12:51:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232172AbjDRMvR (ORCPT ); Tue, 18 Apr 2023 08:51:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43530 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232169AbjDRMvP (ORCPT ); Tue, 18 Apr 2023 08:51:15 -0400 Received: from mail-pf1-x42d.google.com (mail-pf1-x42d.google.com [IPv6:2607:f8b0:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3265716B14 for ; Tue, 18 Apr 2023 05:50:53 -0700 (PDT) Received: by mail-pf1-x42d.google.com with SMTP id d2e1a72fcca58-63b5fca48bcso1709370b3a.0 for ; Tue, 18 Apr 2023 05:50:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1681822252; x=1684414252; 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=Y4OHoFWLVHVOU1gGJFIZyvFQwj4I/n5rmO4u4kQqp5s=; b=NaZDAMGrk+xiKbfMXkfc+hiiltFD0LlTuSqiIbDBkpzWQgLVSgj/O48zJ7VMGlzp68 pCDOEKpcmGwFU7dSgwQqjWorn5Z13vwzcfdi34+M2L5EwoQEbckdcNX1V9iuSn4j74qB 2IMNQfjqpLvm8WWUqmBcV11cHsW5gXqch7xqo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1681822252; x=1684414252; 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=Y4OHoFWLVHVOU1gGJFIZyvFQwj4I/n5rmO4u4kQqp5s=; b=JHGaqnaUaIUY+bpfM77v6IZYCU14s+Xb5uRK+kA1vXfWx+QvBXUDkLyC/PM2ytxzEl jif4nHtKorcEsW8EBEdpE8H92XKB/3nvBjyW/OMWFUUFDhZRhk7D8eWwOshyOAWRXAgh SgAaS/bLh7ApzklDd6wkPf+U4XpmoNwQS/DkIcDjaLZr2Oevr8DeCa5jaysPtFFgoFy1 K8+deOvjqf41jKeZgAraURKCySbmS5uaPCrb9937XdIbnXysmDXy28TKrv+I0ha5Cnc7 mVOo9h+gMr67fKlBhXkGCV+mbL2bdlfjfpOwU8x3Hk4n4xLJjTLWGKgbCDWufa89Mokx tP/Q== X-Gm-Message-State: AAQBX9dDOmZpIntqrP0ioBv/f2Z5LlX3pYOPobg63GhdFcf9Gny2ImeO 35SkQJBt5ueODqLZ03ZSipJ7XQ== X-Google-Smtp-Source: AKy350YD/mHUZFPaUut90TfJLzOLDCDlzOufYyFO14OjgVg1t2eEm+ULWpBI96mTSUIsyi0jY51ohg== X-Received: by 2002:a05:6a00:1483:b0:638:f0b1:4df1 with SMTP id v3-20020a056a00148300b00638f0b14df1mr25744364pfu.24.1681822252585; Tue, 18 Apr 2023 05:50:52 -0700 (PDT) Received: from fshao-glinux.tpe.corp.google.com ([2401:fa00:1:10:2fb7:301d:6083:752b]) by smtp.gmail.com with ESMTPSA id v11-20020a62a50b000000b0063afb08afeesm9323733pfm.67.2023.04.18.05.50.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Apr 2023 05:50:52 -0700 (PDT) From: Fei Shao To: Benjamin Tissoires , Douglas Anderson , Rob Herring Cc: linux-mediatek , Fei Shao , Dmitry Torokhov , Krzysztof Kozlowski , devicetree@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] dt-bindings: input: goodix: Add powered-in-suspend property Date: Tue, 18 Apr 2023 20:49:51 +0800 Message-ID: <20230418124953.3170028-2-fshao@chromium.org> X-Mailer: git-send-email 2.40.0.634.g4ca3ef3211-goog In-Reply-To: <20230418124953.3170028-1-fshao@chromium.org> References: <20230418124953.3170028-1-fshao@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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. This property is used to indicate that the touchscreen is powered in suspend. If it's set, the driver will stop asserting the reset GPIO in power-down, and it will do it in power-up instead to ensure that the state is always reset after resuming. Signed-off-by: Fei Shao Reviewed-by: Douglas Anderson Reviewed-by: Matthias Brugger --- Documentation/devicetree/bindings/input/goodix,gt7375p.yaml | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml b/= Documentation/devicetree/bindings/input/goodix,gt7375p.yaml index ce18d7dadae2..942acb286d77 100644 --- a/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml +++ b/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml @@ -43,6 +43,12 @@ properties: itself as long as it allows the main board to make signals compatible with what the touchscreen is expecting for its IO rails. =20 + powered-in-suspend: + description: + This indicates that the touchscreen is powered in suspend, so the dr= iver + will not assert the reset GPIO in power-down to prevent power leakag= e. + type: boolean + required: - compatible - reg --=20 2.40.0.634.g4ca3ef3211-goog