From nobody Tue Apr 7 08:52:52 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BA9CB37C0E4; Sun, 15 Mar 2026 18:52:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773600773; cv=none; b=gk5NTTEfknPn9xfrw5IGNofMzcFBvKcpUuIOEci9HHiMlFjedW1oAR24yyX/Rx1wsM9Q3CI7Fg93FDTaLADMSgCe5U+6pXGj1jYpwLChyoPT5ePfdRpvUK6dSVeP2nyN2woi2ej0o5Bb1tm2N4W2ymtiAY1gtpHb+6P/mCyPAWo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773600773; c=relaxed/simple; bh=kD90Pnoe+NlXfnVFBh+ajGZPNGOL6hV6WmqC/acHvQQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=pLro0mvFIyyekPT+oJPalX+UU/8oiwWlfWkRnyZk3HAMgpbTIgSUhRm7bIMzeRQfDJCSV2Ck8LVsgtLyew8kZLaofc3nOxDVHlcWrskcjbwhHbS+wji/pxlXQZMge7Qw2SYXPQ3BXRJ920rufogXSuJ9gwnkafkFumAkXz4FN1M= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DIEVAqFz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="DIEVAqFz" Received: by smtp.kernel.org (Postfix) with ESMTPS id 7DE74C2BCC7; Sun, 15 Mar 2026 18:52:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773600773; bh=kD90Pnoe+NlXfnVFBh+ajGZPNGOL6hV6WmqC/acHvQQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=DIEVAqFz+8Ig+lvH4GhnPSysLvd8fLtPHSf/K0dTOnVTGcMny/vMw5UmySsRElzrD qxFUqSgN7RlO5msu1zM6BQaHhy+Sp8SZk30LB2GR0CxO2jnUMr5+8GcF94EWRcvOhM 5tcYTIY8UU0faC/RzH0f9rai+gRe1finYC0UGa8WO6E3rwdYaxTD0fOGJ/PyDIjs+V irb+iEDgSvsqutIem04ALpq+jShyeME9X2dpWAl2cTp0rqqS0D33A2r/I0neJHnsHb Rp92NNFgs88kB85lQw7GI23FLMBLB8ZQVR9nGbFl2eW5ubeNJbpEGJjJSpl4ISPNUA XtJC3h2d3lNEA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 71D86F30280; Sun, 15 Mar 2026 18:52:53 +0000 (UTC) From: David Heidelberg via B4 Relay Date: Sun, 15 Mar 2026 19:52:44 +0100 Subject: [PATCH WIP v2 08/11] Input: stmfts - add optional reset GPIO support Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260315-stmfts5-v2-8-70bc83ee9591@ixit.cz> References: <20260315-stmfts5-v2-0-70bc83ee9591@ixit.cz> In-Reply-To: <20260315-stmfts5-v2-0-70bc83ee9591@ixit.cz> To: Dmitry Torokhov , Maxime Coquelin , Alexandre Torgue , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Henrik Rydberg , Bjorn Andersson , Konrad Dybcio Cc: Petr Hodina , linux-input@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Krzysztof Kozlowski , devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, phone-devel@vger.kernel.org, David Heidelberg X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2354; i=david@ixit.cz; h=from:subject:message-id; bh=Em8LYVoDWru3Ze7de0xKRKpEP94aiXt6/9C91H5R1mc=; b=owEBbQKS/ZANAwAIAWACP8TTSSByAcsmYgBptv/6s4qIoNdujZmmRqRVBiJys5HkVglAFzyP+ R5WsIFNQ/uJAjMEAAEIAB0WIQTXegnP7twrvVOnBHRgAj/E00kgcgUCabb/+gAKCRBgAj/E00kg cn2qD/9kd9xFzBy/yAD4HTM/loZdNokNzuHgsxlh8FIsTOlDUoXtPe9sndnELN4qHVjtsfNtZ0O 48PfOOvSsGY/rOFqRd/Jxi7OnTtZWDJozTdN55+Mph5DpENKt0s43YiaOkEmryRbDxEh/SM30zO DwrTbLld7eTGL6YohdtKi80fWKl8Mfj90fBbWeokSlDqA7qjxqsOHlNuNAlqTXd/kjU0n2m/O66 XW3EEWdDP9Ck2PwuDsLWoxzRoTtU2RrxeDnX5jPDZru76QmAeGp5MlS2pvJ0wfb4BvoDfr9RJIt bDL40MULru+xiomx2EgRtpsnbNc2AV0oqYuJnxDPvkpOCzjnqfiYW6AsSjLtiZrzje5qxMwqZHH 9UySLkVuLojNUyxsf1jRecSBIC2XNepZeiG01FjFHJlc2c+E+R/a817V1A+j14vnb/SwsQm7Y7D 6fPK0981RJylEXuEgYAVqBZk0cfVKxpM+SIKwhZdvpjgIMsKBiBA7cQCbbo8mTB2RxpaygRl9eg OVjneIVOrUaaZ0cm0PgbdKGwizNAhYkiG6BQlq4IEtBHH1ckjbph3TBBKhRy9UTgATpmwExhPqD 35e1LnfvEMwPTfkvBxbfCq9oG1b0fW2a5rMXciwEuy7Gc2uTcZhLiD9QWNzkbeOLLuqvkKzgUyO 1bd2rYkG6kZyqew== X-Developer-Key: i=david@ixit.cz; a=openpgp; fpr=D77A09CFEEDC2BBD53A7047460023FC4D3492072 X-Endpoint-Received: by B4 Relay for david@ixit.cz/default with auth_id=355 X-Original-From: David Heidelberg Reply-To: david@ixit.cz From: Petr Hodina Add support for an optional "reset-gpios" property. If present, the driver drives the reset line high at probe time and releases it during power-on, after the regulators have been enabled. Signed-off-by: Petr Hodina Co-developed-by: David Heidelberg Signed-off-by: David Heidelberg --- drivers/input/touchscreen/stmfts.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/input/touchscreen/stmfts.c b/drivers/input/touchscreen= /stmfts.c index 4dfaf3a6077d9..2c10256e09c5e 100644 --- a/drivers/input/touchscreen/stmfts.c +++ b/drivers/input/touchscreen/stmfts.c @@ -77,6 +77,7 @@ static const struct regulator_bulk_data stmfts_supplies[]= =3D { struct stmfts_data { struct i2c_client *client; struct input_dev *input; + struct gpio_desc *reset_gpio; struct led_classdev led_cdev; struct mutex mutex; =20 @@ -540,6 +541,15 @@ static int stmfts_read_system_info(struct stmfts_data = *sdata) return 0; } =20 +static void stmfts_reset(struct stmfts_data *sdata) +{ + gpiod_set_value_cansleep(sdata->reset_gpio, 1); + msleep(20); + + gpiod_set_value_cansleep(sdata->reset_gpio, 0); + msleep(50); +} + static int stmfts_power_on(struct stmfts_data *sdata) { int err; @@ -549,6 +559,9 @@ static int stmfts_power_on(struct stmfts_data *sdata) if (err) return err; =20 + if (sdata->reset_gpio) + stmfts_reset(sdata); + /* * The datasheet does not specify the power on time, but considering * that the reset time is < 10ms, I sleep 20ms to be sure @@ -607,6 +620,10 @@ static void stmfts_power_off(void *data) struct stmfts_data *sdata =3D data; =20 disable_irq(sdata->client->irq); + + if (sdata->reset_gpio) + gpiod_set_value_cansleep(sdata->reset_gpio, 1); + regulator_bulk_disable(ARRAY_SIZE(stmfts_supplies), sdata->supplies); } @@ -663,6 +680,12 @@ static int stmfts_probe(struct i2c_client *client) if (err) return err; =20 + sdata->reset_gpio =3D devm_gpiod_get_optional(dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(sdata->reset_gpio)) + return dev_err_probe(dev, PTR_ERR(sdata->reset_gpio), + "Failed to get GPIO 'reset'\n"); + sdata->input =3D devm_input_allocate_device(dev); if (!sdata->input) return -ENOMEM; --=20 2.53.0