Re: [PATCH 1/2] leds: is31fl319x: Add sdb pin and generate a 5ms low pulse when startup

[Grant Feng]

Thanks for the review, I will rewrit it.

Grant

On 2020-08-06 23:00, Dan Murphy wrote:
> Grant
>
> On 8/6/20 1:21 AM, Grant Feng wrote:
> > generate a 5ms low pulse on sdb pin when startup, then the chip
> > becomes more stable in the complex EM environment.
> >
> > Signed-off-by: Grant Feng <von81@xxxxxxx>
> > ---
> >   drivers/leds/leds-is31fl319x.c | 12 ++++++++++++
> >   1 file changed, 12 insertions(+)
> >
> > diff --git a/drivers/leds/leds-is31fl319x.c 
> > b/drivers/leds/leds-is31fl319x.c
> > index ca6634b8683c..b4f70002cec9 100644
> > --- a/drivers/leds/leds-is31fl319x.c
> > +++ b/drivers/leds/leds-is31fl319x.c
> > @@ -16,6 +16,8 @@
> >   #include <linux/of_device.h>
> >   #include <linux/regmap.h>
> >   #include <linux/slab.h>
> > +#include <linux/delay.h>
> > +#include <linux/gpio/consumer.h>
> >     /* register numbers */
> >   #define IS31FL319X_SHUTDOWN        0x00
> > @@ -61,6 +63,7 @@
> >   struct is31fl319x_chip {
> >       const struct is31fl319x_chipdef *cdef;
> >       struct i2c_client               *client;
> > +    struct gpio_desc        *sdb_pin;
> >       struct regmap                   *regmap;
> >       struct mutex                    lock;
> >       u32                             audio_gain_db;
> > @@ -265,6 +268,15 @@ static int is31fl319x_parse_dt(struct device *dev,
> >           is31->audio_gain_db = min(is31->audio_gain_db,
> >                         IS31FL319X_AUDIO_GAIN_DB_MAX);
> >   +    is31->sdb_pin = gpiod_get(dev, "sdb", GPIOD_ASIS);
>
> Since this is optional maybe use devm_gpiod_get_optional.
>
> If this is required for stability then if the GPIO is not present then 
> the parse_dt should return the error.
>
> And use the devm_gpiod_get call.  Otherwise you are missing the 
> gpiod_put when exiting or removing the driver.
>
> Dan