From patchwork Tue Apr 18 12:49:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fei Shao X-Patchwork-Id: 675332 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 69B88C77B78 for ; Tue, 18 Apr 2023 12:51:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232164AbjDRMvR (ORCPT ); Tue, 18 Apr 2023 08:51:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43532 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232170AbjDRMvP (ORCPT ); Tue, 18 Apr 2023 08:51:15 -0400 Received: from mail-pf1-x42c.google.com (mail-pf1-x42c.google.com [IPv6:2607:f8b0:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 355D416B23 for ; Tue, 18 Apr 2023 05:50:53 -0700 (PDT) Received: by mail-pf1-x42c.google.com with SMTP id d2e1a72fcca58-63b5c48ea09so1750392b3a.1 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=NBw5zF5jqJssBfhNuKxmyqYaDHdzAx0K/zgGy0XH0ca4AsG+XTQtEmVY+sCMtciO6W cERrFl3zopYuiV+k5i5RuG2qXqxTah2PGhb8sDGgA7pLmRBKnBzTbo4Mx6Nz4FOig3t9 ik4Sa9GpTR8vIodrjx2nTONbVqE1w6MozXAzG3i2qe8Zs+1Rj5O9wNASTbJ5y4ZCTkHI JbZ5nz0OhC7awCL3pJGYYvZxQ8M8nOeAbmM9NZnt3u2N7iLmZqtzC8AElrsnzZFjX5oF /JvtklDXJtesDwFP6uzyeNn2BYTZAtJdAcRwgQ15ebkjHMHfABnBcdl5DDrq+lWfa7PX JwEg== X-Gm-Message-State: AAQBX9fN5qH9bHizwJvFSSqHyGfDQJDuEjVLI/OLeb0pbwTMw/bMnuvm wu4WrXa1MJqDQ34tdISwgCCGwQ== 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 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org 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 --- 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. + powered-in-suspend: + description: + This indicates that the touchscreen is powered in suspend, so the driver + will not assert the reset GPIO in power-down to prevent power leakage. + type: boolean + required: - compatible - reg