Re: [PATCH v3 1/2] ARM: hip04: set ARCH_NR_GPIO to 128

Linus Walleij
2014-12-01T14:04:49Z

On Sat, Nov 29, 2014 at 8:11 AM, Zhou Wang <wangzhou.bry-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> On 2014年11月28日 17:33, Arnd Bergmann wrote:
>> On Friday 28 November 2014 14:29:47 Zhou Wang wrote:

>>> default 264 if MACH_H4700
>>> + default 128 if ARCH_HIP04
>>> default 0
>>> help
>>> Maximum number of GPIOs in the system.
>>>
>>
>> If I remember correctly, you don't actually need to set this if all gpio
>> clients are using the new gpio descriptor interfaces instead of gpio
>> numbers. Would that work for you? You'd have to know which devices
>
> If I don't set this, it will use the default ARCH_NR_GPIO(512), then
> the range of GPIO number will be 384~511 which is very strange to users,
> because Hip04 based machines can only support 128 GPIOs.

That is a totally different problem.

Not that these numbers have ever been stable...

Think of a patch to gpiochip_find_base() in
drivers/gpio/gpiolib.c to fix this so that numbers are
assigned a better way rather than doing
random hacks with numbers like this.

Yours,
Linus Walleij