On Tue, Sep 30, 2014 at 7:02 PM, Bjorn Andersson
[off-list ref] wrote:

On Wed 24 Sep 06:09 PDT 2014, Ivan T. Ivanov wrote:

quoted

I am unable to make this work. of_gpio_simple_xlate() didn't know that
GPIO range is offset with 1. Requesting last GPIO return error. And
debug output looks weird, for example:

# cat /sys/kernel/debug/gpio
...
GPIOs 220-255, platform/0.c000.gpios, 0.c000.gpios:
...

# cat /sys/kernel/debug/pinctrl/0.c000.gpios/gpio-ranges
GPIO ranges handled:
1: 0.c000.gpios GPIOS [221 - 256] PINS [0 - 35]

Advice, please.

Looking at of_gpio_simple_xlate() shows that you're right. It doesn't seem to
be possible to have a gpiochip that is not 0-based. Then I guess you have to
have your own "off-by-one-xlate".

@Linus, any comments on this? All documentation states that we have
gpio1-gpioXX in these chips, so we have to expose it as such or things will be
messy.

I remember that drivers/pinctrl/nomadik/pinctrl-abx500.c had the
same problem, but I don't remember how we solved it sadly :-/

Yours,
Linus Walleij