altera_ps2: Add devicetree support

Add match table for device tree binding.

v2: use const and add compat version.
v3: change compatible vendor to ALTR.
add dts binding doc.
v4: condition module device table export for of.

Signed-off-by: Walter Goossens <[e-mail]>
Signed-off-by: Thomas Chou <[e-mail]>
Acked-by: Dmitry Torokhov <[e-mail]>
[[e-mail]: fixed missing semicolon]
Signed-off-by: Grant Likely <[e-mail]>

Documentation/devicetree/bindings/serio/altera_ps2.txt

···
+Altera UP PS/2 controller
+
+Required properties:
+- compatible : should be "ALTR,ps2-1.0".

drivers/input/serio/altera_ps2.c

···
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/slab.h>
+#include <linux/of.h>
 
 #define DRV_NAME "altera_ps2"
 
···
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id altera_ps2_match[] = {
+	{ .compatible = "ALTR,ps2-1.0", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, altera_ps2_match);
+#else /* CONFIG_OF */
+#define altera_ps2_match NULL
+#endif /* CONFIG_OF */
+
 /*
  * Our device driver structure
  */
···
 	.driver	= {
 		.name	= DRV_NAME,
 		.owner	= THIS_MODULE,
+		.of_match_table = altera_ps2_match,
 	},
 };
 
···
 {
 	return platform_driver_register(&altera_ps2_driver);
 }
+module_init(altera_ps2_init);
 
 static void __exit altera_ps2_exit(void)
 {
 	platform_driver_unregister(&altera_ps2_driver);
 }
-
-module_init(altera_ps2_init);
 module_exit(altera_ps2_exit);
 
 MODULE_DESCRIPTION("Altera University Program PS2 controller driver");