gpiolib: Export gpiochip_irqchip_irq_valid() to drivers

Some pinctrl drivers can use the gpiochip irq valid information
to figure out if certain gpios are exposed to the kernel for
usage or not. Expose this API so we can use it in the
pinmux_ops::request ops.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 55e672592fa9..b6a05dd0d10a 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -431,6 +431,9 @@ int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip,
                              bool threaded,
                              struct lock_class_key *lock_key);
 
+bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip,
+                                unsigned int offset);
+
 #ifdef CONFIG_LOCKDEP
 
 /*