gpiolib: let gpiochip_add_pin_range() specify offset

Like with commit 3c739ad0df5eb41cd7adad879eda6aa09879eb76
it is not always enough to specify all the pins of a gpio_chip
from offset zero to be added to a pin map range, since the
mapping from GPIO to pin controller may not be linear at all,
but need to be broken into a few consecutive sub-ranges or
1-pin entries for complicated cases. The ranges may also be
sparse.

This alters the signature of the function to accept offsets
into both the GPIO-chip local pinspace and the pin controller
local pinspace.

Reviewed-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 2b84fc32fae..ec58fdbddb5 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -283,14 +283,16 @@ struct gpio_pin_range {
 };
 
 int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
-                           unsigned int pin_base, unsigned int npins);
+                           unsigned int offset, unsigned int pin_base,
+                           unsigned int npins);
 void gpiochip_remove_pin_ranges(struct gpio_chip *chip);
 
 #else
 
 static inline int
 gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
-                       unsigned int pin_base, unsigned int npins)
+                       unsigned int offset, unsigned int pin_base,
+                       unsigned int npins)
 {
         return 0;
 }