[PATCH v2 1/3] dt-bindings: adv7180: Introduce the 'reset-gpios' property

[PATCH v2 1/3] dt-bindings: adv7180: Introduce the 'reset-gpios' property

[Fabio Estevam]

Introduce the 'reset-gpios' property to describe the GPIO that connects
to the ADV7180 reset pin.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
---
Changes since v1:
- None

 Documentation/devicetree/bindings/media/i2c/adv7180.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/i2c/adv7180.yaml b/Documentation/devicetree/bindings/media/i2c/adv7180.yaml
index bcfd93739b4f..1f1aa46f5724 100644
--- a/Documentation/devicetree/bindings/media/i2c/adv7180.yaml
+++ b/Documentation/devicetree/bindings/media/i2c/adv7180.yaml
@@ -35,6 +35,9 @@ properties:
   powerdown-gpios:
     maxItems: 1
 
+  reset-gpios:
+    maxItems: 1
+
   port:
     $ref: /schemas/graph.yaml#/properties/port
 
-- 
2.25.1

[PATCH v2 2/3] media: adv7180: Add optional reset GPIO

[Fabio Estevam]

From: Frieder Schrempf <frieder.schrempf@kontron.de>

There is a reset input that can be controlled by GPIO. Let's add it
to let the driver control it if required.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
---
Changes since v1:
- Used Frieder's version of the patch.

 drivers/media/i2c/adv7180.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
index 44bb6fe85644..2890041cc231 100644
--- a/drivers/media/i2c/adv7180.c
+++ b/drivers/media/i2c/adv7180.c
@@ -205,6 +205,7 @@ struct adv7180_state {
 	struct mutex		mutex; /* mutual excl. when accessing chip */
 	int			irq;
 	struct gpio_desc	*pwdn_gpio;
+	struct gpio_desc	*rst_gpio;
 	v4l2_std_id		curr_norm;
 	bool			powered;
 	bool			streaming;
@@ -484,6 +485,19 @@ static void adv7180_set_power_pin(struct adv7180_state *state, bool on)
 	}
 }
 
+static void adv7180_set_reset_pin(struct adv7180_state *state, bool on)
+{
+	if (!state->rst_gpio)
+		return;
+
+	if (on) {
+		gpiod_set_value_cansleep(state->rst_gpio, 1);
+	} else {
+		gpiod_set_value_cansleep(state->rst_gpio, 0);
+		usleep_range(5000, 10000);
+	}
+}
+
 static int adv7180_set_power(struct adv7180_state *state, bool on)
 {
 	u8 val;
@@ -1263,6 +1277,7 @@ static int init_device(struct adv7180_state *state)
 	mutex_lock(&state->mutex);
 
 	adv7180_set_power_pin(state, true);
+	adv7180_set_reset_pin(state, false);
 
 	adv7180_write(state, ADV7180_REG_PWR_MAN, ADV7180_PWR_MAN_RES);
 	usleep_range(5000, 10000);
@@ -1338,6 +1353,14 @@ static int adv7180_probe(struct i2c_client *client,
 		return ret;
 	}
 
+	state->rst_gpio = devm_gpiod_get_optional(&client->dev, "reset",
+						   GPIOD_OUT_HIGH);
+	if (IS_ERR(state->rst_gpio)) {
+		ret = PTR_ERR(state->rst_gpio);
+		v4l_err(client, "request for reset pin failed: %d\n", ret);
+		return ret;
+	}
+
 	if (state->chip_info->flags & ADV7180_FLAG_MIPI_CSI2) {
 		state->csi_client = i2c_new_dummy_device(client->adapter,
 				ADV7180_DEFAULT_CSI_I2C_ADDR);
@@ -1428,6 +1451,7 @@ static int adv7180_remove(struct i2c_client *client)
 	i2c_unregister_device(state->vpp_client);
 	i2c_unregister_device(state->csi_client);
 
+	adv7180_set_reset_pin(state, true);
 	adv7180_set_power_pin(state, false);
 
 	mutex_destroy(&state->mutex);
-- 
2.25.1

[PATCH v2 3/3] media: i2c: adv7180: Print the chip ID on probe

[Fabio Estevam]

Improve the probe message by printing the chip ID version.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
---
Changes since v1:
- Added Frieder's Reviewed-by tag.

 drivers/media/i2c/adv7180.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
index 2890041cc231..4f99b46e7eaa 100644
--- a/drivers/media/i2c/adv7180.c
+++ b/drivers/media/i2c/adv7180.c
@@ -1415,11 +1415,19 @@ static int adv7180_probe(struct i2c_client *client,
 	if (ret)
 		goto err_free_irq;
 
-	v4l_info(client, "chip found @ 0x%02x (%s)\n",
-		 client->addr, client->adapter->name);
+	mutex_lock(&state->mutex);
+	ret = adv7180_read(state, ADV7180_REG_IDENT);
+	mutex_unlock(&state->mutex);
+	if (ret < 0)
+		goto err_v4l2_async_unregister;
+
+	v4l_info(client, "chip id 0x%x found @ 0x%02x (%s)\n",
+		 ret, client->addr, client->adapter->name);
 
 	return 0;
 
+err_v4l2_async_unregister:
+	v4l2_async_unregister_subdev(sd);
 err_free_irq:
 	if (state->irq > 0)
 		free_irq(client->irq, state);
-- 
2.25.1

Re: [PATCH v2 1/3] dt-bindings: adv7180: Introduce the 'reset-gpios' property

[Rob Herring]

On Mon, 31 May 2021 08:22:35 -0300, Fabio Estevam wrote:
> Introduce the 'reset-gpios' property to describe the GPIO that connects
> to the ADV7180 reset pin.
> 
> Signed-off-by: Fabio Estevam <festevam@gmail.com>
> ---
> Changes since v1:
> - None
> 
>  Documentation/devicetree/bindings/media/i2c/adv7180.yaml | 3 +++
>  1 file changed, 3 insertions(+)
> 

Acked-by: Rob Herring <robh@kernel.org>