linux-kernel - Re: [PATCH 1/1] gpio: add Lynxpoint chipset gpio driver.

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Message-ID: <CACRpkdaaFZ2Ai1tWy5KYxF9dVWmc8s4Lj8DajACAFYHdBFxBtg@mail.gmail.com>
Date:	Tue, 11 Dec 2012 01:34:04 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	mika.westerberg@...ux.intel.com, rafael.j.wysocki@...el.com,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 1/1] gpio: add Lynxpoint chipset gpio driver.

On Tue, Dec 11, 2012 at 12:07 AM, Grant Likely
<grant.likely@...retlab.ca> wrote:
> On Fri,  7 Dec 2012 16:01:39 +0200, Mathias Nyman <mathias.nyman@...ux.intel.com> wrote:
>> Add gpio support for Intel Lynxpoint chipset.
>> Lynxpoint supports 94 gpio pins which can generate interrupts.
>> Driver will fail requests for pins that are marked as owned by ACPI, or
>> set in an alternate mode (non-gpio).
>>
>> Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
>> ---
>> +static void lp_gpio_set(struct gpio_chip *chip, unsigned gpio, int value)
>> +{
>> +     struct lp_gpio *lg = container_of(chip, struct lp_gpio, chip);
>> +     unsigned long reg = gpio_reg(chip, gpio, LP_CONFIG1);
>> +     unsigned long flags;
>> +
>> +     spin_lock_irqsave(&lg->lock, flags);
>> +
>> +     if (value)
>> +             outl(inl(reg) | OUT_LVL_BIT, reg);
>> +     else
>> +             outl(inl(reg) & ~OUT_LVL_BIT, reg);
>> +
>> +     spin_unlock_irqrestore(&lg->lock, flags);
>> +}
>
> A *lot* of drivers implement their own GPIO ops like this, and they all
> end up looking the same. Please take a look at
> drivers/gpio/gpio-generic.c and see if you can use the stock operations
> provided there.

I was under the impression that the generic code could not be
used off-the-shelf for drivers doing irqchips (like this one).

But maybe I'm mistaken or it's trivial to fix?

Yours,
Linus Walleij
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