Hi Uwe,
On 03/02/2015 08:00 AM, Uwe Kleine-König wrote:
> Since 39b2bbe3d715 (gpio: add flags argument to gpiod_get*() functions)
> which appeared in v3.17-rc1, the gpiod_get* functions take an additional
> parameter that allows to specify direction and initial value for output.
> Simplify accordingly.
>
> Moreover use devm_gpiod_get_index_optional instead of
> devm_gpiod_get_index with ignoring all errors.
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koe...@pengutronix.de>
> ---
> BTW, sparse fails to check this file with many errors like:
>
> drivers/media/i2c/adv7604.c:311:11: error: unknown field name in
> initializer
>
> Didn't look into that.
That's a sparse bug that's been fixed in the sparse repo, but not in the 0.5.0
release (they really should make a new sparse release IMHO).
Some comments below:
> ---
> drivers/media/i2c/adv7604.c | 16 ++++++----------
> 1 file changed, 6 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c
> index 5a7c9389a605..ddeeb6695a4b 100644
> --- a/drivers/media/i2c/adv7604.c
> +++ b/drivers/media/i2c/adv7604.c
> @@ -537,12 +537,8 @@ static void adv7604_set_hpd(struct adv7604_state *state,
> unsigned int hpd)
> {
> unsigned int i;
>
> - for (i = 0; i < state->info->num_dv_ports; ++i) {
> - if (IS_ERR(state->hpd_gpio[i]))
> - continue;
Why this change? See also below:
> -
> + for (i = 0; i < state->info->num_dv_ports; ++i)
> gpiod_set_value_cansleep(state->hpd_gpio[i], hpd & BIT(i));
> - }
>
> v4l2_subdev_notify(&state->sd, ADV7604_HOTPLUG, &hpd);
> }
> @@ -2720,13 +2716,13 @@ static int adv7604_probe(struct i2c_client *client,
> /* Request GPIOs. */
> for (i = 0; i < state->info->num_dv_ports; ++i) {
> state->hpd_gpio[i] =
> - devm_gpiod_get_index(&client->dev, "hpd", i);
> + devm_gpiod_get_index_optional(&client->dev, "hpd", i,
> + GPIOD_OUT_LOW);
> if (IS_ERR(state->hpd_gpio[i]))
> - continue;
> -
> - gpiod_direction_output(state->hpd_gpio[i], 0);
> + return PTR_ERR(state->hpd_gpio[i]);
This isn't correct. The use of gpio is optional, on some boards a different
mechanism is used to control the hpd, and there devm_gpiod_get_index will just
return an error. That's OK, we just continue in that case.
Regards,
Hans
>
> - v4l_info(client, "Handling HPD %u GPIO\n", i);
> + if (state->hpd_gpio[i])
> + v4l_info(client, "Handling HPD %u GPIO\n", i);
> }
>
> state->timings = cea640x480;
>
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