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SubjectRe: [PATCH v4 3/8] media: adv7180: add support for NEWAVMODE
Date
Hi Steve,

Thank you for the patch.

On Wednesday 03 Aug 2016 11:03:45 Steve Longerbeam wrote:
> Parse the optional v4l2 endpoint DT node. If the bus type is
> V4L2_MBUS_BT656 and the endpoint node specifies "newavmode",
> configure the BT.656 bus in NEWAVMODE.
>
> Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
>
> ---
>
> v4: no changes
> v3:
> - the newavmode endpoint property is now private to adv7180.
> ---
> .../devicetree/bindings/media/i2c/adv7180.txt | 4 ++
> drivers/media/i2c/adv7180.c | 46 +++++++++++++++++--
> 2 files changed, 47 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/media/i2c/adv7180.txt
> b/Documentation/devicetree/bindings/media/i2c/adv7180.txt index
> 0d50115..6c175d2 100644
> --- a/Documentation/devicetree/bindings/media/i2c/adv7180.txt
> +++ b/Documentation/devicetree/bindings/media/i2c/adv7180.txt
> @@ -15,6 +15,10 @@ Required Properties :
> "adi,adv7282"
> "adi,adv7282-m"
>
> +Optional Endpoint Properties :
> +- newavmode: a boolean property to indicate the BT.656 bus is operating
> + in Analog Device's NEWAVMODE. Valid for BT.656 busses only.

This is a vendor-specific property, it should be prefixed with "adi,". Could
you also explain how this mode works ? I'd like to make sure it qualifies for
a DT property.

> +
> Example:
>
> i2c0@1c22000 {
> diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
> index 6e093c22..467953e 100644
> --- a/drivers/media/i2c/adv7180.c
> +++ b/drivers/media/i2c/adv7180.c
> @@ -31,6 +31,7 @@
> #include <media/v4l2-event.h>
> #include <media/v4l2-device.h>
> #include <media/v4l2-ctrls.h>
> +#include <media/v4l2-of.h>
> #include <linux/mutex.h>
> #include <linux/delay.h>
>
> @@ -106,6 +107,7 @@
> #define ADV7180_REG_SHAP_FILTER_CTL_1 0x0017
> #define ADV7180_REG_CTRL_2 0x001d
> #define ADV7180_REG_VSYNC_FIELD_CTL_1 0x0031
> +#define ADV7180_VSYNC_FIELD_CTL_1_NEWAVMODE 0x02
> #define ADV7180_REG_MANUAL_WIN_CTL_1 0x003d
> #define ADV7180_REG_MANUAL_WIN_CTL_2 0x003e
> #define ADV7180_REG_MANUAL_WIN_CTL_3 0x003f
> @@ -214,6 +216,7 @@ struct adv7180_state {
> struct mutex mutex; /* mutual excl. when accessing chip */
> int irq;
> v4l2_std_id curr_norm;
> + bool newavmode;
> bool powered;
> bool streaming;
> u8 input;
> @@ -864,9 +867,15 @@ static int adv7180_init(struct adv7180_state *state)
> if (ret < 0)
> return ret;
>
> - /* Manually set V bit end position in NTSC mode */
> - return adv7180_write(state, ADV7180_REG_NTSC_V_BIT_END,
> - ADV7180_NTSC_V_BIT_END_MANUAL_NVEND);
> + if (!state->newavmode) {
> + /* Manually set V bit end position in NTSC mode */
> + ret = adv7180_write(state, ADV7180_REG_NTSC_V_BIT_END,
> + ADV7180_NTSC_V_BIT_END_MANUAL_NVEND);
> + if (ret < 0)
> + return ret;
> + }
> +
> + return 0;
> }
>
> static int adv7180_set_std(struct adv7180_state *state, unsigned int std)
> @@ -1217,6 +1226,13 @@ static int init_device(struct adv7180_state *state)
> if (ret)
> goto out_unlock;
>
> + if (state->newavmode) {
> + ret = adv7180_write(state, ADV7180_REG_VSYNC_FIELD_CTL_1,
> + ADV7180_VSYNC_FIELD_CTL_1_NEWAVMODE);
> + if (ret < 0)
> + goto out_unlock;
> + }
> +
> ret = adv7180_program_std(state);
> if (ret)
> goto out_unlock;
> @@ -1257,6 +1273,28 @@ out_unlock:
> return ret;
> }
>
> +static void adv7180_of_parse(struct adv7180_state *state)
> +{
> + struct i2c_client *client = state->client;
> + struct device_node *np = client->dev.of_node;
> + struct device_node *endpoint;
> + struct v4l2_of_endpoint ep;
> +
> + endpoint = of_graph_get_next_endpoint(np, NULL);
> + if (!endpoint) {
> + v4l_warn(client, "endpoint node not found\n");
> + return;
> + }
> +
> + v4l2_of_parse_endpoint(endpoint, &ep);
> + if (ep.bus_type == V4L2_MBUS_BT656) {
> + if (of_property_read_bool(endpoint, "newavmode"))
> + state->newavmode = true;
> + }
> +
> + of_node_put(endpoint);
> +}
> +
> static int adv7180_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> @@ -1279,6 +1317,8 @@ static int adv7180_probe(struct i2c_client *client,
> state->field = V4L2_FIELD_ALTERNATE;
> state->chip_info = (struct adv7180_chip_info *)id->driver_data;
>
> + adv7180_of_parse(state);
> +
> if (state->chip_info->flags & ADV7180_FLAG_MIPI_CSI2) {
> state->csi_client = i2c_new_dummy(client->adapter,
> ADV7180_DEFAULT_CSI_I2C_ADDR);

--
Regards,

Laurent Pinchart

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