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Date: Fri, 26 Jul 2013 12:09:20 +0200
From: Hans Verkuil <hverkuil@...all.nl>
To: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
CC: LMML <linux-media@...r.kernel.org>,
DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
LKML <linux-kernel@...r.kernel.org>,
devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v4] media: i2c: tvp7002: add OF support
Hi Prabhakar,
On 07/18/2013 05:54 PM, Lad, Prabhakar wrote:
> From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
>
> add OF support for the tvp7002 driver.
>
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> ---
> This patch depends on https://patchwork.kernel.org/patch/2828800/
>
> Changes for v4:
> 1: Improved descrition of end point properties.
>
> Changes for v3:
> 1: Fixed review comments pointed by Sylwester.
>
> .../devicetree/bindings/media/i2c/tvp7002.txt | 53 ++++++++++++++++
> drivers/media/i2c/tvp7002.c | 67 ++++++++++++++++++--
> 2 files changed, 113 insertions(+), 7 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/media/i2c/tvp7002.txt
>
> diff --git a/Documentation/devicetree/bindings/media/i2c/tvp7002.txt b/Documentation/devicetree/bindings/media/i2c/tvp7002.txt
> new file mode 100644
> index 0000000..1d00935
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/tvp7002.txt
> @@ -0,0 +1,53 @@
> +* Texas Instruments TV7002 video decoder
> +
> +The TVP7002 device supports digitizing of video and graphics signal in RGB and
> +YPbPr color space.
> +
> +Required Properties :
> +- compatible : Must be "ti,tvp7002"
> +
> +Optional Properties:
> +- hsync-active: HSYNC Polarity configuration for the bus. Default value when
> + this property is not specified is <0>.
> +
> +- vsync-active: VSYNC Polarity configuration for the bus. Default value when
> + this property is not specified is <0>.
> +
> +- pclk-sample: Clock polarity of the bus. Default value when this property is
> + not specified is <0>.
> +
> +- sync-on-green-active: Active state of Sync-on-green signal property of the
> + endpoint.
> + 0 = Normal Operation (Default)
I would extend this a little bit:
0 = Normal Operation (Active Low, Default)
> + 1 = Inverted operation
> +
> +- field-even-active: Active-high Field ID output polarity control of the bus.
> + Under normal operation, the field ID output is set to logic 1 for an odd field
> + (field 1)and set to logic 0 for an even field (field 0).
Add space before 'and'.
> + 0 = Normal operation (default)
> + 1 = FID output polarity inverted
> +
> +For further reading of port node refer Documentation/devicetree/bindings/media/
> +video-interfaces.txt.
> +
> +Example:
> +
> + i2c0@...2000 {
> + ...
> + ...
> + tvp7002@5c {
> + compatible = "ti,tvp7002";
> + reg = <0x5c>;
> +
> + port {
> + tvp7002_1: endpoint {
> + hsync-active = <1>;
> + vsync-active = <1>;
> + pclk-sample = <0>;
> + sync-on-green-active = <1>;
> + field-even-active = <0>;
> + };
> + };
> + };
> + ...
> + };
> diff --git a/drivers/media/i2c/tvp7002.c b/drivers/media/i2c/tvp7002.c
> index f6b1f3f..24a08fa 100644
> --- a/drivers/media/i2c/tvp7002.c
> +++ b/drivers/media/i2c/tvp7002.c
> @@ -35,6 +35,8 @@
> #include <media/v4l2-device.h>
> #include <media/v4l2-common.h>
> #include <media/v4l2-ctrls.h>
> +#include <media/v4l2-of.h>
> +
> #include "tvp7002_reg.h"
>
> MODULE_DESCRIPTION("TI TVP7002 Video and Graphics Digitizer driver");
> @@ -943,6 +945,48 @@ static const struct v4l2_subdev_ops tvp7002_ops = {
> .pad = &tvp7002_pad_ops,
> };
>
> +static struct tvp7002_config *
> +tvp7002_get_pdata(struct i2c_client *client)
> +{
> + struct v4l2_of_endpoint bus_cfg;
> + struct tvp7002_config *pdata;
> + struct device_node *endpoint;
> + unsigned int flags;
> +
> + if (!IS_ENABLED(CONFIG_OF) || !client->dev.of_node)
> + return client->dev.platform_data;
> +
> + endpoint = v4l2_of_get_next_endpoint(client->dev.of_node, NULL);
> + if (!endpoint)
> + return NULL;
> +
> + pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
> + if (!pdata)
> + goto done;
> +
> + v4l2_of_parse_endpoint(endpoint, &bus_cfg);
> + flags = bus_cfg.bus.parallel.flags;
> +
> + if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
> + pdata->hs_polarity = 1;
> +
> + if (flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
> + pdata->vs_polarity = 1;
> +
> + if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
> + pdata->clk_polarity = 1;
> +
> + if (flags & V4L2_MBUS_FIELD_EVEN_HIGH)
> + pdata->fid_polarity = 1;
> +
> + if (flags & V4L2_MBUS_VIDEO_SOG_ACTIVE_HIGH)
> + pdata->sog_polarity = 1;
> +
> +done:
> + of_node_put(endpoint);
> + return pdata;
> +}
> +
> /*
> * tvp7002_probe - Probe a TVP7002 device
> * @c: ptr to i2c_client struct
> @@ -954,32 +998,32 @@ static const struct v4l2_subdev_ops tvp7002_ops = {
> */
> static int tvp7002_probe(struct i2c_client *c, const struct i2c_device_id *id)
> {
> + struct tvp7002_config *pdata = tvp7002_get_pdata(c);
> struct v4l2_subdev *sd;
> struct tvp7002 *device;
> struct v4l2_dv_timings timings;
> int polarity_a;
> int polarity_b;
> u8 revision;
> -
> int error;
>
> + if (pdata == NULL) {
> + dev_err(&c->dev, "No platform data\n");
> + return -EINVAL;
> + }
> +
> /* Check if the adapter supports the needed features */
> if (!i2c_check_functionality(c->adapter,
> I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
> return -EIO;
>
> - if (!c->dev.platform_data) {
> - v4l_err(c, "No platform data!!\n");
> - return -ENODEV;
> - }
> -
> device = devm_kzalloc(&c->dev, sizeof(struct tvp7002), GFP_KERNEL);
>
> if (!device)
> return -ENOMEM;
>
> sd = &device->sd;
> - device->pdata = c->dev.platform_data;
> + device->pdata = pdata;
> device->current_timings = tvp7002_timings;
>
> /* Tell v4l2 the device is ready */
> @@ -1084,9 +1128,18 @@ static const struct i2c_device_id tvp7002_id[] = {
> };
> MODULE_DEVICE_TABLE(i2c, tvp7002_id);
>
> +#if IS_ENABLED(CONFIG_OF)
> +static const struct of_device_id tvp7002_of_match[] = {
> + { .compatible = "ti,tvp7002", },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, tvp7002_of_match);
> +#endif
> +
> /* I2C driver data */
> static struct i2c_driver tvp7002_driver = {
> .driver = {
> + .of_match_table = of_match_ptr(tvp7002_of_match),
> .owner = THIS_MODULE,
> .name = TVP7002_MODULE_NAME,
> },
>
Regards,
Hans
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