gpio: mpc8xxx: Convert to platform device interface.

This way we do not need to transverse the device tree manually.

Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Acked-by: Peter Korsgaard <peter@korsgaard.com>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 22 insertions, 26 deletions

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index d1ff879e6ff2..57eb794b6fc9 100644
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -15,6 +15,7 @@
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/of_irq.h>
+#include <linux/of_platform.h>
 #include <linux/gpio.h>
 #include <linux/slab.h>
 #include <linux/irq.h>
@@ -342,8 +343,9 @@ static struct of_device_id mpc8xxx_gpio_ids[] __initdata = {
         {}
 };
 
-static void __init mpc8xxx_add_controller(struct device_node *np)
+static int mpc8xxx_probe(struct platform_device *pdev)
 {
+        struct device_node *np = pdev->dev.of_node;
         struct mpc8xxx_gpio_chip *mpc8xxx_gc;
         struct of_mm_gpio_chip *mm_gc;
         struct gpio_chip *gc;
@@ -351,11 +353,9 @@ static void __init mpc8xxx_add_controller(struct device_node *np)
         unsigned hwirq;
         int ret;
 
-        mpc8xxx_gc = kzalloc(sizeof(*mpc8xxx_gc), GFP_KERNEL);
-        if (!mpc8xxx_gc) {
-                ret = -ENOMEM;
-                goto err;
-        }
+        mpc8xxx_gc = devm_kzalloc(&pdev->dev, sizeof(*mpc8xxx_gc), GFP_KERNEL);
+        if (!mpc8xxx_gc)
+                return -ENOMEM;
 
         spin_lock_init(&mpc8xxx_gc->lock);
 
@@ -375,16 +375,16 @@ static void __init mpc8xxx_add_controller(struct device_node *np)
 
         ret = of_mm_gpiochip_add(np, mm_gc);
         if (ret)
-                goto err;
+                return ret;
 
         hwirq = irq_of_parse_and_map(np, 0);
         if (hwirq == NO_IRQ)
-                goto skip_irq;
+                return 0;
 
         mpc8xxx_gc->irq = irq_domain_add_linear(np, MPC8XXX_GPIO_PINS,
                                         &mpc8xxx_gpio_irq_ops, mpc8xxx_gc);
         if (!mpc8xxx_gc->irq)
-                goto skip_irq;
+                return 0;
 
         id = of_match_node(mpc8xxx_gpio_ids, np);
         if (id)
@@ -397,24 +397,20 @@ static void __init mpc8xxx_add_controller(struct device_node *np)
         irq_set_handler_data(hwirq, mpc8xxx_gc);
         irq_set_chained_handler(hwirq, mpc8xxx_gpio_irq_cascade);
 
-skip_irq:
-        return;
-
-err:
-        pr_err("%s: registration failed with status %d\n",
-               np->full_name, ret);
-        kfree(mpc8xxx_gc);
-
-        return;
+        return 0;
 }
 
-static int __init mpc8xxx_add_gpiochips(void)
-{
-        struct device_node *np;
-
-        for_each_matching_node(np, mpc8xxx_gpio_ids)
-                mpc8xxx_add_controller(np);
+static struct platform_driver mpc8xxx_plat_driver = {
+        .probe          = mpc8xxx_probe,
+        .driver         = {
+                .name = "gpio-mpc8xxx",
+                .of_match_table = mpc8xxx_gpio_ids,
+        },
+};
 
-        return 0;
+static int __init mpc8xxx_init(void)
+{
+        return platform_driver_register(&mpc8xxx_plat_driver);
 }
-arch_initcall(mpc8xxx_add_gpiochips);
+
+arch_initcall(mpc8xxx_init);