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Message-ID: <OS0PR01MB5922821AF13AE6E2368B195486F2A@OS0PR01MB5922.jpnprd01.prod.outlook.com>
Date: Mon, 11 Sep 2023 08:18:37 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Jacopo Mondi <jacopo.mondi@...asonboard.com>
CC: Sakari Ailus <sakari.ailus@...ux.intel.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Biju Das <biju.das.au@...il.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: RE: [PATCH 1/2] media: i2c: ov7670: Extend match support for OF
tables
Hi Jacopo Mondi,
Thanks for the feedback.
> Subject: Re: [PATCH 1/2] media: i2c: ov7670: Extend match support for OF
> tables
>
> Hi Biju
>
> On Sun, Sep 10, 2023 at 04:00:32PM +0100, Biju Das wrote:
> > The driver has an OF match table, still, it uses an ID lookup table
> > for retrieving match data. Currently, the driver is working on the
> > assumption that an I2C device registered via OF will always match a
> > legacy I2C device ID. The correct approach is to have an OF device ID
> > table using i2c_get_match_data() if the devices are registered via OF/ID.
> >
> > Unify the OF/ID table by using struct ov7670_devtype as match data for
> > both these tables and replace the ID lookup table for the match data
> > by i2c_get_match_data().
> >
> > Split the array ov7670_devdata[] as individual variables, and make
> > lines shorter by referring to e.g. &ov7670_devdata instead of
> > &ov7670_devdata[MODEL_OV7670].
> >
> > Drop enum ov7670_model as there is no user.
> >
> > While at it, remove the trailing comma in the terminator entry for the
> > OF table making code robust against (theoretical) misrebases or other
> > similar things where the new entry goes _after_ the termination
> > without the compiler noticing.
> >
> > Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> > ---
> > drivers/media/i2c/ov7670.c | 47
> > ++++++++++++++++----------------------
> > 1 file changed, 20 insertions(+), 27 deletions(-)
> >
> > diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c
> > index 2f55491ef571..644457e6993d 100644
> > --- a/drivers/media/i2c/ov7670.c
> > +++ b/drivers/media/i2c/ov7670.c
> > @@ -186,11 +186,6 @@ MODULE_PARM_DESC(debug, "Debug level (0-1)");
> > #define REG_HAECC7 0xaa /* Hist AEC/AGC control 7 */
> > #define REG_BD60MAX 0xab /* 60hz banding step limit */
> >
> > -enum ov7670_model {
> > - MODEL_OV7670 = 0,
> > - MODEL_OV7675,
> > -};
> > -
> > struct ov7670_win_size {
> > int width;
> > int height;
> > @@ -1774,21 +1769,6 @@ static const struct v4l2_subdev_internal_ops
> > ov7670_subdev_internal_ops = {
> >
> > /*
> > ----------------------------------------------------------------------
> > - */
> >
> > -static const struct ov7670_devtype ov7670_devdata[] = {
> > - [MODEL_OV7670] = {
> > - .win_sizes = ov7670_win_sizes,
> > - .n_win_sizes = ARRAY_SIZE(ov7670_win_sizes),
> > - .set_framerate = ov7670_set_framerate_legacy,
> > - .get_framerate = ov7670_get_framerate_legacy,
> > - },
> > - [MODEL_OV7675] = {
> > - .win_sizes = ov7675_win_sizes,
> > - .n_win_sizes = ARRAY_SIZE(ov7675_win_sizes),
> > - .set_framerate = ov7675_set_framerate,
> > - .get_framerate = ov7675_get_framerate,
> > - },
> > -};
> > -
> > static int ov7670_init_gpio(struct i2c_client *client, struct
> > ov7670_info *info) {
> > info->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown",
> > @@ -1849,7 +1829,6 @@ static int ov7670_parse_dt(struct device *dev,
> >
> > static int ov7670_probe(struct i2c_client *client) {
> > - const struct i2c_device_id *id = i2c_client_get_device_id(client);
> > struct v4l2_fract tpf;
> > struct v4l2_subdev *sd;
> > struct ov7670_info *info;
> > @@ -1923,7 +1902,7 @@ static int ov7670_probe(struct i2c_client *client)
> > v4l_info(client, "chip found @ 0x%02x (%s)\n",
> > client->addr << 1, client->adapter->name);
> >
> > - info->devtype = &ov7670_devdata[id->driver_data];
> > + info->devtype = i2c_get_match_data(client);
>
> I was about to complain this function is not used, but then I noticed you
> just introduced it, so this is like the first user!
This driver is not the first user. Now plenty of users are there in Linux-next, 6.6-rc1 and [1]
https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/log/?h=testing&qt=grep&q=biju.das
>
>
> > info->fmt = &ov7670_formats[0];
> > info->wsize = &info->devtype->win_sizes[0];
> >
> > @@ -2013,17 +1992,31 @@ static void ov7670_remove(struct i2c_client
> *client)
> > media_entity_cleanup(&info->sd.entity);
> > }
> >
> > +static const struct ov7670_devtype ov7670_devdata = {
> > + .win_sizes = ov7670_win_sizes,
> > + .n_win_sizes = ARRAY_SIZE(ov7670_win_sizes),
> > + .set_framerate = ov7670_set_framerate_legacy,
> > + .get_framerate = ov7670_get_framerate_legacy, };
> > +
> > +static const struct ov7670_devtype ov7675_devdata = {
> > + .win_sizes = ov7675_win_sizes,
> > + .n_win_sizes = ARRAY_SIZE(ov7675_win_sizes),
> > + .set_framerate = ov7675_set_framerate,
> > + .get_framerate = ov7675_get_framerate, };
> > +
> > static const struct i2c_device_id ov7670_id[] = {
> > - { "ov7670", MODEL_OV7670 },
> > - { "ov7675", MODEL_OV7675 },
> > - { }
> > + { "ov7670", (kernel_ulong_t)&ov7670_devdata },
> > + { "ov7675", (kernel_ulong_t)&ov7675_devdata },
> > + { /* sentinel */ }
> > };
> > MODULE_DEVICE_TABLE(i2c, ov7670_id);
> >
> > #if IS_ENABLED(CONFIG_OF)
> > static const struct of_device_id ov7670_of_match[] = {
> > - { .compatible = "ovti,ov7670", },
> > - { /* sentinel */ },
> > + { .compatible = "ovti,ov7670", &ov7670_devdata },
> > + { /* sentinel */ }
>
> The patch looks good to me, would be nice to know if you have been able to
> run-time test at least one of the drivers you have moved to use
> i2c_get_match_data().
I already done similar testing on [1], [2] and [3]
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v6.6-rc1&id=b7f73b6e921b457a222e86cf53fe3950c6b5aed5
[2] https://lore.kernel.org/all/20230830142358.275459-1-biju.das.jz@bp.renesas.com/
[3] https://lore.kernel.org/all/OS0PR01MB5922F55D18824F155228259086E7A@OS0PR01MB5922.jpnprd01.prod.outlook.com/
Cheers,
Biju
>
> Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@...asonboard.com>
>
> > };
> > MODULE_DEVICE_TABLE(of, ov7670_of_match); #endif
> > --
> > 2.25.1
> >
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