[PATCH v4 08/11] Input: stmfts - add optional reset GPIO support

David Heidelberg via B4 Relay
2026-04-08T22:16:06Z

From: Petr Hodina <petr.hodina@protonmail.com>

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 <petr.hodina@protonmail.com>
Co-developed-by: David Heidelberg <david@ixit.cz>
Signed-off-by: David Heidelberg <david@ixit.cz>
---
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