linux-kernel - Re: [PATCH] gpio: pca953x: Add optional reset gpio control

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Message-ID: <CAHp75Vey4R8o+7h3DuBJ9FiciGSHfvRWjs_0d3ZWeTm+cB4WrA@mail.gmail.com>
Date:   Wed, 4 Jan 2017 12:31:59 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
Cc:     Steve Longerbeam <slongerbeam@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH] gpio: pca953x: Add optional reset gpio control

On Wed, Jan 4, 2017 at 12:20 PM, Vladimir Zapolskiy
<vladimir_zapolskiy@...tor.com> wrote:
> On 01/04/2017 01:37 AM, Andy Shevchenko wrote:
>> On Mon, Jan 2, 2017 at 11:07 PM, Steve Longerbeam <slongerbeam@...il.com> wrote:
>>> Add optional reset-gpios pin control. If present, de-assert the
>>> specified reset gpio pin to bring the chip out of reset.
>>
>>> --- a/drivers/gpio/gpio-pca953x.c
>>> +++ b/drivers/gpio/gpio-pca953x.c
>>> @@ -22,6 +22,7 @@
>>>  #include <linux/of_platform.h>
>>>  #include <linux/acpi.h>
>>>  #include <linux/regulator/consumer.h>
>>
>>> +#include <linux/gpio/consumer.h>
>>
>> Please, try to put it somehow alphabetically ordered (yes, I see it's
>> not in general, but try to squeeze it into longest part which is
>> ordered).
>>
>>>
>>>  #define PCA953X_INPUT          0
>>>  #define PCA953X_OUTPUT         1
>>> @@ -754,8 +755,18 @@ static int pca953x_probe(struct i2c_client *client,
>>>                 invert = pdata->invert;
>>>                 chip->names = pdata->names;
>>>         } else {
>>> +               struct gpio_desc *reset_gpio;
>>> +
>>>                 chip->gpio_start = -1;
>>>                 irq_base = 0;
>>> +
>>> +               /* see if we need to de-assert a reset pin */
>>
>> see -> See
>>
>>> +               reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
>>> +                                                    GPIOD_OUT_LOW);
>>
>> Shouldn't be _optional_exclusive?
>> See this recent discussion https://patchwork.ozlabs.org/patch/706002/
>
> There is no devm_gpiod_get_optional_exclusive(), probably you confuse
> the function with devm_reset_control_get_optional_exclusive().

Perhaps it's time to add
drivers/reset/reset-gpio.c ?

>
>>> +               if (IS_ERR(reset_gpio)) {
>>> +                       dev_err(&client->dev, "request for reset pin failed\n");
>>> +                       return PTR_ERR(reset_gpio);
>>> +               }
>>>         }
>>
>
> --
> With best wishes,
> Vladimir



-- 
With Best Regards,
Andy Shevchenko