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Message-ID: <b35tzbbecycfqetgczc53g6rtnyi5g5lo3tbyj776wfudnrcdn@kqkoaqtugusg>
Date: Mon, 11 Sep 2023 10:57:09 +0200
From: Jacopo Mondi <jacopo.mondi@...asonboard.com>
To: Biju Das <biju.das.jz@...renesas.com>
Cc: Jacopo Mondi <jacopo.mondi@...asonboard.com>,
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 Biju
On Mon, Sep 11, 2023 at 08:18:37AM +0000, Biju Das wrote:
> 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
>
Ah sorry, I was on media/master
> >
> >
> > > 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/
Ok, thanks a lot for confirming, it will make it easier to review the
other series with confidence!
Thanks
j
>
> 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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