drivers: tty: goldfish: Add device tree bindings

Enable support for registering this device using the device tree.
Device tree node example for registering Goldfish TTY device :

goldfish_tty@1f004000 {
    interrupts = <0xc>;
    reg = <0x1f004000 0x1000>;
    compatible = "google,goldfish-tty";
};

Signed-off-by: Miodrag Dinic <miodrag.dinic@imgtec.com>
Signed-off-by: Jin Qian <jinqian@android.com>
Signed-off-by: Alan <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 26 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/goldfish/tty.txt b/Documentation/devicetree/bindings/goldfish/tty.txt
new file mode 100644
index 000000000000..82648278da77
--- /dev/null
+++ b/Documentation/devicetree/bindings/goldfish/tty.txt
@@ -0,0 +1,17 @@
+Android Goldfish TTY
+
+Android goldfish tty device generated by android emulator.
+
+Required properties:
+
+- compatible : should contain "google,goldfish-tty" to match emulator
+- reg        : <registers mapping>
+- interrupts : <interrupt mapping>
+
+Example:
+
+        goldfish_tty@1f004000 {
+                compatible = "google,goldfish-tty";
+                reg = <0x1f004000 0x1000>;
+                interrupts = <0xc>;
+        };
diff --git a/drivers/tty/goldfish.c b/drivers/tty/goldfish.c
index 752232c77503..1b3142cdb27d 100644
--- a/drivers/tty/goldfish.c
+++ b/drivers/tty/goldfish.c
@@ -324,11 +324,19 @@ static int goldfish_tty_remove(struct platform_device *pdev)
         return 0;
 }
 
+static const struct of_device_id goldfish_tty_of_match[] = {
+        { .compatible = "google,goldfish-tty", },
+        {},
+};
+
+MODULE_DEVICE_TABLE(of, goldfish_tty_of_match);
+
 static struct platform_driver goldfish_tty_platform_driver = {
         .probe = goldfish_tty_probe,
         .remove = goldfish_tty_remove,
         .driver = {
-                .name = "goldfish_tty"
+                .name = "goldfish_tty",
+                .of_match_table = goldfish_tty_of_match,
         }
 };