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Wed, 8 Apr 2026 22:15:51 +0000 (UTC) From: David Heidelberg via B4 Relay Date: Thu, 09 Apr 2026 00:15:51 +0200 Subject: [PATCH v4 08/11] Input: stmfts - add optional reset GPIO support MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260409-stmfts5-v4-8-64fe62027db5@ixit.cz> References: <20260409-stmfts5-v4-0-64fe62027db5@ixit.cz> In-Reply-To: <20260409-stmfts5-v4-0-64fe62027db5@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=2312; i=david@ixit.cz; h=from:subject:message-id; bh=Oxezv3LVWvcy2a3O5okAfGZrVzhTs38AJC0Tf+JxgKo=; b=owEBbQKS/ZANAwAIAWACP8TTSSByAcsmYgBp1tOS1d0dXj0iC1bnB2PUOAopZm69S/9Tys0l2 OabmP/9zpiJAjMEAAEIAB0WIQTXegnP7twrvVOnBHRgAj/E00kgcgUCadbTkgAKCRBgAj/E00kg cq4tD/9UxMKbKC9JdKOG/RwoIBh3Vxa1qrGkKMKNGVETPPjVe0qRqV9CZrtO5PUA2/wMgWabwqv 9gCKoiUUNMtQeU1OQ2KMrE1dC5970Sqc6Bos4Z5fYXgWRRYAgsmb+TjUy1eVi7yaH5PWLPdSp3p cFRkmNnw9HcN8WF7hO2Gdnja0JZW7suYSRkmI2U+OYXzg2zPF7jcZ4oLmsWligdKOD96CM4hTlg HrD58ZCyJGR3ldncKB80ez/jAGud3LhSzsdehGDeSVqIHljSdcMI8smlpeRn4l34wCEzlgJlsRQ s37y00Hoi8gTYrAUHQt+q45pWUIe6NsMrWphr/dBt+snDeizP0Y91uXeeNJmDnp0F29rz13FQQG 1o6RO3JW7kvveZrrZhjB54fFWtIMHlLdXnEqQxLxBB738pvbNOEww38g3ra5pfXXtCxgvowIL0a DQZPXsv4MG6PicmdS9r0RLeH0WHHqrwFYsVrehRO4Nd5mMJ7LnEtVSpTof8mvvpmPMm1UVc7Yhf KsY9xWEsG5eohoFg9XpUQJfFoj0NNNe8fiokWDt6jYswtnaA1D6ZyvmE2jtoOiGFh2zhsiQ4g+7 KTcwakKTqhp8k9dKjzpQ4BeoU7FbrVcQBcZzveCKEHVh3YDjbzkvkAJj4x8qyK1v42Y6QxIPvrG jcUSG7Pr1w3fsxA== 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260408_151554_147147_29221467 X-CRM114-Status: GOOD ( 13.55 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: david@ixit.cz Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 b61a19e954296..1e6d9a287cd0c 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[] = { struct stmfts_data { struct i2c_client *client; struct input_dev *input; + struct gpio_desc *reset_gpio; struct led_classdev led_cdev; struct mutex mutex; @@ -539,6 +540,15 @@ static int stmfts_read_system_info(struct stmfts_data *sdata) return 0; } +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_configure(struct stmfts_data *sdata) { int err; @@ -599,6 +609,9 @@ static int stmfts_power_on(struct stmfts_data *sdata) */ msleep(20); + if (sdata->reset_gpio) + stmfts_reset(sdata); + err = stmfts_configure(sdata); if (err) regulator_bulk_disable(ARRAY_SIZE(stmfts_supplies), @@ -612,6 +625,10 @@ static void stmfts_power_off(void *data) struct stmfts_data *sdata = data; 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); } @@ -668,6 +685,12 @@ static int stmfts_probe(struct i2c_client *client) if (err) return err; + sdata->reset_gpio = 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 = devm_input_allocate_device(dev); if (!sdata->input) return -ENOMEM; -- 2.53.0