Hi,
On Monday 14 December 2015 21:26:25 Laurent Pinchart wrote:
> Hi Markus,
>
> Thank you for the patch.
>
> On Monday 14 December 2015 15:41:51 Markus Pargmann wrote:
> > Add optional reset and standby gpios. The reset gpio is used to reset
> > the chip in power_on().
> >
> > The standby gpio is not used currently. It is just unset, so the chip is
> > not in standby.
> >
> > Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
> > Reviewed-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
> > Acked-by: Rob Herring <robh@xxxxxxxxxx>
> > ---
> > .../devicetree/bindings/media/i2c/mt9v032.txt | 2 ++
> > drivers/media/i2c/mt9v032.c | 28 +++++++++++++++++++
> > 2 files changed, 30 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/media/i2c/mt9v032.txt
> > b/Documentation/devicetree/bindings/media/i2c/mt9v032.txt index
> > 202565313e82..100f0ae43269 100644
> > --- a/Documentation/devicetree/bindings/media/i2c/mt9v032.txt
> > +++ b/Documentation/devicetree/bindings/media/i2c/mt9v032.txt
> > @@ -20,6 +20,8 @@ Optional Properties:
> >
> > - link-frequencies: List of allowed link frequencies in Hz. Each frequency
> > is expressed as a 64-bit big-endian integer.
> > +- reset-gpios: GPIO handle which is connected to the reset pin of the chip.
> > +- standby-gpios: GPIO handle which is connected to the standby pin of the
> > chip.
> >
> > For further reading on port node refer to
> > Documentation/devicetree/bindings/media/video-interfaces.txt.
> > diff --git a/drivers/media/i2c/mt9v032.c b/drivers/media/i2c/mt9v032.c
> > index a68ce94ee097..c1bc564a0979 100644
> > --- a/drivers/media/i2c/mt9v032.c
> > +++ b/drivers/media/i2c/mt9v032.c
> > @@ -14,6 +14,7 @@
> >
> > #include <linux/clk.h>
> > #include <linux/delay.h>
> > +#include <linux/gpio/consumer.h>
> > #include <linux/i2c.h>
> > #include <linux/log2.h>
> > #include <linux/mutex.h>
> > @@ -251,6 +252,8 @@ struct mt9v032 {
> >
> > struct regmap *regmap;
> > struct clk *clk;
> > + struct gpio_desc *reset_gpio;
> > + struct gpio_desc *standby_gpio;
> >
> > struct mt9v032_platform_data *pdata;
> > const struct mt9v032_model_info *model;
> > @@ -312,16 +315,31 @@ static int mt9v032_power_on(struct mt9v032 *mt9v032)
> > struct regmap *map = mt9v032->regmap;
> > int ret;
> >
> > + if (mt9v032->reset_gpio)
> > + gpiod_set_value_cansleep(mt9v032->reset_gpio, 1);
> > +
>
> gpiod_set_value_cansleep() already checks whether the gpiod is NULL, you don't
> need to duplicate the check here.
>
> Apart from that,
>
> Acked-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
>
> No need to resubmit I'll fix this when applying.
Ok, thank you.
Best Regards,
Markus
>
> > ret = clk_set_rate(mt9v032->clk, mt9v032->sysclk);
> > if (ret < 0)
> > return ret;
> >
> > + /* System clock has to be enabled before releasing the reset */
> > ret = clk_prepare_enable(mt9v032->clk);
> > if (ret)
> > return ret;
> >
> > udelay(1);
> >
> > + if (mt9v032->reset_gpio) {
> > + gpiod_set_value_cansleep(mt9v032->reset_gpio, 0);
> > +
> > + /* After releasing reset we need to wait 10 clock cycles
> > + * before accessing the sensor over I2C. As the minimum SYSCLK
> > + * frequency is 13MHz, waiting 1µs will be enough in the worst
> > + * case.
> > + */
> > + udelay(1);
> > + }
> > +
> > /* Reset the chip and stop data read out */
> > ret = regmap_write(map, MT9V032_RESET, 1);
> > if (ret < 0)
> > @@ -954,6 +972,16 @@ static int mt9v032_probe(struct i2c_client *client,
> > if (IS_ERR(mt9v032->clk))
> > return PTR_ERR(mt9v032->clk);
> >
> > + mt9v032->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
> > + GPIOD_OUT_HIGH);
> > + if (IS_ERR(mt9v032->reset_gpio))
> > + return PTR_ERR(mt9v032->reset_gpio);
> > +
> > + mt9v032->standby_gpio = devm_gpiod_get_optional(&client->dev, "standby",
> > + GPIOD_OUT_LOW);
> > + if (IS_ERR(mt9v032->standby_gpio))
> > + return PTR_ERR(mt9v032->standby_gpio);
> > +
> > mutex_init(&mt9v032->power_lock);
> > mt9v032->pdata = pdata;
> > mt9v032->model = (const void *)did->driver_data;
>
>
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