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

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Message-ID: <20200806190840.zyovbkqgr2ey7rd6@duo.ucw.cz>
Date:   Thu, 6 Aug 2020 21:08:40 +0200
From:   Pavel Machek <pavel@....cz>
To:     Dan Murphy <dmurphy@...com>
Cc:     Grant Feng <von81@....com>, jacek.anaszewski@...il.com,
        robh+dt@...nel.org, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] leds: is31fl319x: Add sdb pin and generate a 5ms low
 pulse when startup

Hi!
> 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@....com>
> > ---
> >   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.

Yep, thanks for the review, I dropped it from for-next.

And yes, this should be in series with device tree change, and we need
Rob 's ack.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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