Add basic support for an optional reset gpio.
Signed-off-by: Sebastian Reichel <sebastian.reic...@collabora.com>
---
.../input/touchscreen/eeti,exc3000.yaml | 2 ++
drivers/input/touchscreen/exc3000.c | 17 +++++++++++++++++
2 files changed, 19 insertions(+)
diff --git
a/Documentation/devicetree/bindings/input/touchscreen/eeti,exc3000.yaml
b/Documentation/devicetree/bindings/input/touchscreen/eeti,exc3000.yaml
index 7e6e23f8fa00..007adbc89c14 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/eeti,exc3000.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/eeti,exc3000.yaml
@@ -22,6 +22,8 @@ properties:
const: 0x2a
interrupts:
maxItems: 1
+ reset-gpios:
+ maxItems: 1
touchscreen-size-x: true
touchscreen-size-y: true
touchscreen-inverted-x: true
diff --git a/drivers/input/touchscreen/exc3000.c
b/drivers/input/touchscreen/exc3000.c
index b5a3bbb63504..de9d0ae1210a 100644
--- a/drivers/input/touchscreen/exc3000.c
+++ b/drivers/input/touchscreen/exc3000.c
@@ -8,7 +8,9 @@
*/
#include <linux/bitops.h>
+#include <linux/delay.h>
#include <linux/device.h>
+#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
@@ -33,6 +35,9 @@
#define EXC3000_TIMEOUT_MS 100
+#define EXC3000_RESET_MS 10
+#define EXC3000_READY_MS 100
+
static const struct i2c_device_id exc3000_id[];
struct eeti_dev_info {
@@ -66,6 +71,7 @@ struct exc3000_data {
const struct eeti_dev_info *info;
struct input_dev *input;
struct touchscreen_properties prop;
+ struct gpio_desc *reset;
struct timer_list timer;
u8 buf[2 * EXC3000_LEN_FRAME];
struct completion wait_event;
@@ -325,6 +331,17 @@ static int exc3000_probe(struct i2c_client *client)
init_completion(&data->wait_event);
mutex_init(&data->query_lock);
+ data->reset = devm_gpiod_get_optional(&client->dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(data->reset))
+ return PTR_ERR(data->reset);
+
+ if (data->reset) {
+ msleep(EXC3000_RESET_MS);
+ gpiod_set_value_cansleep(data->reset, 0);
+ msleep(EXC3000_READY_MS);
+ }
+
input = devm_input_allocate_device(&client->dev);
if (!input)
return -ENOMEM;
--
2.26.2
