This patch was to add loongson 2k0500, 2k2000 and 3a5000 gpio chip
driver support and define inten_offset attibute to enable gpio chip
interrupt.
Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>