Subject: [PATCH 3/5] gpio/omap: Add DT support to GPIO driver

From: [email-masked] (Jon Hunter)
Date: Fri, 26 Apr 2013 16:31:24 -0500

On 04/26/2013 02:31 AM, Linus Walleij wrote:
> On Wed, Apr 17, 2013 at 2:41 AM, Javier Martinez Canillas
> <[email-masked]> wrote:
> 
> So:
> 
>> +static int omap_gpio_irq_domain_xlate(struct irq_domain *d,
>> +                                     struct device_node *ctrlr,
>> +                                     const u32 *intspec, unsigned int intsize,
>> +                                     irq_hw_number_t *out_hwirq,
>> +                                     unsigned int *out_type)
>> +{
>> +       int ret;
>> +       struct gpio_bank *bank = d->host_data;
>> +       int gpio = bank->chip.base + intspec[0];
>> +
>> +       if (WARN_ON(intsize < 2))
>> +               return -EINVAL;
>> +
>> +       ret = gpio_request_one(gpio, GPIOF_IN, ctrlr->full_name);
>> +       if (ret)
>> +               return ret;
> 
> So how to figure out if a device is already requesting this GPIO
> on some orthogonal axis?

I really don't think that is necessary. Hopefully, my other email [1]
elaborates on why. Let me know if this makes sense.

Cheers
Jon

[1] http://marc.info/?l=linux-arm-kernel&m=136701158117966&w=1