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

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Date:   Sat, 8 Aug 2020 08:52:25 +0800
From:   Grant Feng <von81@....com>
To:     Dan Murphy <dmurphy@...com>, jacek.anaszewski@...il.com,
        pavel@....cz, 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

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@....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.
>
> Dan
>