Re: [PATCH] pinctrl: msm: allow the gpio base to be configurable

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On 1/26/18 7:01 AM, Linus Walleij wrote:
This is a feature not a bug. It encourages people not to
depend on the global GPIO numberspace.

Just set it to -1.

If I change it to -1, then I think I'm going to break every existing MSM platform that depends on the base address being 0, because then every MSM driver will have a non-zero base, and none of the existing drivers register more than one GPIO device.

So how about this:

	static int base = 0;

	chip->base = base;
	base = -1;

This way, existing code works as before. If any driver registers two GPIO devices, the first one will get a base of 0, and the second one will get some other base.

gpiochip_find_base: found new base at 437
(...)
gpiochip_find_base: found new base at 362
These are awesome bases, just beautiful. Use this.

If you don't like seeing GPIO base numbers like this: use things
like the chardev and the tools in tools/gpio or libgpiod when
developing, and you will never see them. They should not make
a difference anyway.

Can you tell me more about the chardev? I've always been using "echo X > /sys/class/gpio/export", so I guess that's not the right way to do things.

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