gpiolib: let gpio_chip reference its descriptors

Add a pointer to the gpio_chip structure that references the array of
GPIO descriptors belonging to the chip, and update gpiolib code to use
this pointer instead of the global gpio_desc[] array. This is another
step towards the removal of the gpio_desc[] global array.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.orh>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index b562f95cdc2f..bde646995d10 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -47,6 +47,7 @@ struct gpio;
 struct seq_file;
 struct module;
 struct device_node;
+struct gpio_desc;
 
 /**
  * struct gpio_chip - abstract a GPIO controller
@@ -76,6 +77,7 @@ struct device_node;
  *      negative during registration, requests dynamic ID allocation.
  * @ngpio: the number of GPIOs handled by this controller; the last GPIO
  *      handled is (base + ngpio - 1).
+ * @desc: array of ngpio descriptors. Private.
  * @can_sleep: flag must be set iff get()/set() methods sleep, as they
  *      must while accessing GPIO expander chips over I2C or SPI
  * @names: if set, must be an array of strings to use as alternative
@@ -126,6 +128,7 @@ struct gpio_chip {
                                                 struct gpio_chip *chip);
         int                     base;
         u16                     ngpio;
+        struct gpio_desc        *desc;
         const char              *const *names;
         unsigned                can_sleep:1;
         unsigned                exported:1;