gpiolib: port of_ functions to use gpiod

Refactor the of_ functions of gpiolib to use the now public gpiod
interface, and export of_get_named_gpiod_flags() and
of_get_gpiod_flags() functions.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 17 insertions, 11 deletions

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 0dfaf20e4dad..32a396d891be 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -15,19 +15,21 @@
 #include <linux/errno.h>
 #include <linux/module.h>
 #include <linux/io.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_gpio.h>
 #include <linux/pinctrl/pinctrl.h>
 #include <linux/slab.h>
 
+struct gpio_desc;
+
 /* Private data structure for of_gpiochip_find_and_xlate */
 struct gg_data {
         enum of_gpio_flags *flags;
         struct of_phandle_args gpiospec;
 
-        int out_gpio;
+        struct gpio_desc *out_gpio;
 };
 
 /* Private function for resolving node pointer to gpio_chip */
@@ -45,28 +47,31 @@ static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
         if (ret < 0)
                 return false;
 
-        gg_data->out_gpio = ret + gc->base;
+        gg_data->out_gpio = gpio_to_desc(ret + gc->base);
         return true;
 }
 
 /**
- * of_get_named_gpio_flags() - Get a GPIO number and flags to use with GPIO API
+ * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API
  * @np:         device node to get GPIO from
  * @propname:   property name containing gpio specifier(s)
  * @index:      index of the GPIO
  * @flags:      a flags pointer to fill in
  *
- * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
+ * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
  * value on the error condition. If @flags is not NULL the function also fills
  * in flags for the GPIO.
  */
-int of_get_named_gpio_flags(struct device_node *np, const char *propname,
-                           int index, enum of_gpio_flags *flags)
+struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
+                     const char *propname, int index, enum of_gpio_flags *flags)
 {
         /* Return -EPROBE_DEFER to support probe() functions to be called
          * later when the GPIO actually becomes available
          */
-        struct gg_data gg_data = { .flags = flags, .out_gpio = -EPROBE_DEFER };
+        struct gg_data gg_data = {
+                .flags = flags,
+                .out_gpio = ERR_PTR(-EPROBE_DEFER)
+        };
         int ret;
 
         /* .of_xlate might decide to not fill in the flags, so clear it. */
@@ -78,16 +83,17 @@ int of_get_named_gpio_flags(struct device_node *np, const char *propname,
         if (ret) {
                 pr_debug("%s: can't parse gpios property of node '%s[%d]'\n",
                         __func__, np->full_name, index);
-                return ret;
+                return ERR_PTR(ret);
         }
 
         gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
 
         of_node_put(gg_data.gpiospec.np);
-        pr_debug("%s exited with status %d\n", __func__, gg_data.out_gpio);
+        pr_debug("%s exited with status %d\n", __func__,
+                 PTR_RET(gg_data.out_gpio));
         return gg_data.out_gpio;
 }
-EXPORT_SYMBOL(of_get_named_gpio_flags);
+EXPORT_SYMBOL(of_get_named_gpiod_flags);
 
 /**
  * of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags