linux-kernel - Re: [PATCH] pinctrl: pinctrl-adi2: GPIO output value should be set after the GPIO interrupt is disabled.

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Date:	Tue, 8 Oct 2013 15:59:56 +0800
From:	Sonic Zhang <sonic.adi@...il.com>
To:	Axel Lin <axel.lin@...ics.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	adi-buildroot-devel@...ts.sourceforge.net,
	Sonic Zhang <sonic.zhang@...log.com>
Subject: Re: [PATCH] pinctrl: pinctrl-adi2: GPIO output value should be set
 after the GPIO interrupt is disabled.

Hi Axel,

On Tue, Oct 8, 2013 at 3:48 PM, Axel Lin <axel.lin@...ics.com> wrote:
> 2013/10/8 Sonic Zhang <sonic.adi@...il.com>:
>> From: Sonic Zhang <sonic.zhang@...log.com>
>>
>> Use BIT macro as well.
>>
>> Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
>> ---
>>  drivers/pinctrl/pinctrl-adi2.c | 14 ++++++++------
>>  1 file changed, 8 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/pinctrl/pinctrl-adi2.c b/drivers/pinctrl/pinctrl-adi2.c
>> index a74e6f4..7a39562 100644
>> --- a/drivers/pinctrl/pinctrl-adi2.c
>> +++ b/drivers/pinctrl/pinctrl-adi2.c
>> @@ -766,9 +766,9 @@ static void adi_gpio_set_value(struct gpio_chip *chip, unsigned offset,
>>         spin_lock_irqsave(&port->lock, flags);
>>
>>         if (value)
>> -               writew(1 << offset, &regs->data_set);
>> +               writew(BIT(offset), &regs->data_set);
>>         else
>> -               writew(1 << offset, &regs->data_clear);
>> +               writew(BIT(offset), &regs->data_clear);
>>
>>         spin_unlock_irqrestore(&port->lock, flags);
>>  }
>> @@ -780,12 +780,14 @@ static int adi_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
>>         struct gpio_port_t *regs = port->regs;
>>         unsigned long flags;
>>
>> -       adi_gpio_set_value(chip, offset, value);
>> -
>>         spin_lock_irqsave(&port->lock, flags);
>>
>> -       writew(readw(&regs->inen) & ~(1 << offset), &regs->inen);
>> -       writew(1 << offset, &regs->dir_set);
>> +       writew(readw(&regs->inen) & ~BIT(offset), &regs->inen);
>> +       if (value)
>> +               writew(BIT(offset), &regs->data_set);
>> +       else
>> +               writew(BIT(offset), &regs->data_clear);
>
> I think we can add an unlocked version of adi_gpio_set_value() to
> avoid duplicated code.

That may be over engineering for such a simple code.

Regards,

Sonic
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