gpio: Adjust of_xlate API to support multiple GPIO chips

[firefly-linux-kernel-4.4.55.git] / drivers / gpio / gpiolib-of.c

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index bf984b6dc477ce837c0a49ff265830e6efad2d80..d18068a9f3ecf18aaf0a0106ca7c1b4c752d25c9 100644 (file)
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -15,11 +15,39 @@
 #include <linux/errno.h>
 #include <linux/module.h>
 #include <linux/io.h>
+#include <linux/gpio.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_gpio.h>
 #include <linux/slab.h>
 
+/* Private data structure for of_gpiochip_is_match */
+struct gg_data {
+       enum of_gpio_flags *flags;
+       struct of_phandle_args gpiospec;
+
+       int out_gpio;
+};
+
+/* Private function for resolving node pointer to gpio_chip */
+static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
+{
+       struct gg_data *gg_data = data;
+       int ret;
+
+       if ((gc->of_node != gg_data->gpiospec.np) ||
+           (gc->of_gpio_n_cells != gg_data->gpiospec.args_count) ||
+           (!gc->of_xlate))
+               return false;
+
+       ret = gc->of_xlate(gc, &gg_data->gpiospec, gg_data->flags);
+       if (ret < 0)
+               return false;
+
+       gg_data->out_gpio = ret + gc->base;
+       return true;
+}
+
 /**
  * of_get_named_gpio_flags() - Get a GPIO number and flags to use with GPIO API
  * @np:                device node to get GPIO from
@@ -34,46 +62,25 @@
 int of_get_named_gpio_flags(struct device_node *np, const char *propname,
                            int index, enum of_gpio_flags *flags)
 {
+       struct gg_data gg_data = { .flags = flags, .out_gpio = -ENODEV };
        int ret;
-       struct gpio_chip *gc;
-       struct of_phandle_args gpiospec;
+
+       /* .of_xlate might decide to not fill in the flags, so clear it. */
+       if (flags)
+               *flags = 0;
 
        ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index,
-                                        &gpiospec);
+                                        &gg_data.gpiospec);
        if (ret) {
                pr_debug("%s: can't parse gpios property\n", __func__);
-               goto err0;
-       }
-
-       gc = of_node_to_gpiochip(gpiospec.np);
-       if (!gc) {
-               pr_debug("%s: gpio controller %s isn't registered\n",
-                        np->full_name, gpiospec.np->full_name);
-               ret = -ENODEV;
-               goto err1;
-       }
-
-       if (gpiospec.args_count != gc->of_gpio_n_cells) {
-               pr_debug("%s: wrong #gpio-cells for %s\n",
-                        np->full_name, gpiospec.np->full_name);
-               ret = -EINVAL;
-               goto err1;
+               return -EINVAL;
        }
 
-       /* .xlate might decide to not fill in the flags, so clear it. */
-       if (flags)
-               *flags = 0;
-
-       ret = gc->of_xlate(gc, &gpiospec, flags);
-       if (ret < 0)
-               goto err1;
+       gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
 
-       ret += gc->base;
-err1:
-       of_node_put(gpiospec.np);
-err0:
+       of_node_put(gg_data.gpiospec.np);
        pr_debug("%s exited with status %d\n", __func__, ret);
-       return ret;
+       return gg_data.out_gpio;
 }
 EXPORT_SYMBOL(of_get_named_gpio_flags);
 
@@ -227,14 +234,3 @@ void of_gpiochip_remove(struct gpio_chip *chip)
        if (chip->of_node)
                of_node_put(chip->of_node);
 }
-
-/* Private function for resolving node pointer to gpio_chip */
-static int of_gpiochip_is_match(struct gpio_chip *chip, const void *data)
-{
-       return chip->of_node == data;
-}
-
-struct gpio_chip *of_node_to_gpiochip(struct device_node *np)
-{
-       return gpiochip_find(np, of_gpiochip_is_match);
-}