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media: adv7180: Add optional reset GPIO 

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

[hverkuil: fix a small checkpatch alignment warning]

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Frieder Schrempf 2021-05-31 13:22:36 +02:00 committed by Mauro Carvalho Chehab
parent 724fae9588
commit abb7c7c2f0
1 changed files with 24 additions and 0 deletions
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24
drivers/media/i2c/adv7180.c
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@ -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);