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SubjectRe: [PATCH 1/1] gpio: add Lynxpoint chipset gpio driver.
On 12/11/2012 01:07 AM, Grant Likely wrote:
> On Fri, 7 Dec 2012 16:01:39 +0200, Mathias Nyman<mathias.nyman@linux.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@linux.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.
>
> g.
>

Look quite similar but turns out the only potential generic ones which
could be used are the bgpio_set() and bgpio_get() funtions. Using them
would require custom pin2mask, write_reg, read_reg, etc functions.
bgpio_set_direction

I guess using gpio-generic code fits memory mapped devices better.
Trying to use it for io port devices would require a lot of code mangling.

-Mathias


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