rtc: rv8803: Add OF device ID table

The driver doesn't have a struct of_device_id table but supported devices
are registered via Device Trees. This is working on the assumption that a
I2C device registered via OF will always match a legacy I2C device ID and
that the MODALIAS reported will always be of the form i2c:<device>.

But this could change in the future so the correct approach is to have an
OF device ID table if the devices are registered via OF.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

1 files changed, 20 insertions, 1 deletions

diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c
index f9277e536f7e..9ad97ab29866 100644
--- a/drivers/rtc/rtc-rv8803.c
+++ b/drivers/rtc/rtc-rv8803.c
@@ -18,6 +18,7 @@
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 #include <linux/rtc.h>
 
 #define RV8803_I2C_TRY_COUNT            4
@@ -556,7 +557,11 @@ static int rv8803_probe(struct i2c_client *client,
 
         mutex_init(&rv8803->flags_lock);
         rv8803->client = client;
-        rv8803->type = id->driver_data;
+        if (client->dev.of_node)
+                rv8803->type = (enum rv8803_type)
+                        of_device_get_match_data(&client->dev);
+        else
+                rv8803->type = id->driver_data;
         i2c_set_clientdata(client, rv8803);
 
         flags = rv8803_read_reg(client, RV8803_FLAG);
@@ -627,9 +632,23 @@ static const struct i2c_device_id rv8803_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, rv8803_id);
 
+static const struct of_device_id rv8803_of_match[] = {
+        {
+                .compatible = "microcrystal,rv8803",
+                .data = (void *)rx_8900
+        },
+        {
+                .compatible = "epson,rx8900",
+                .data = (void *)rx_8900
+        },
+        { }
+};
+MODULE_DEVICE_TABLE(of, rv8803_of_match);
+
 static struct i2c_driver rv8803_driver = {
         .driver = {
                 .name = "rtc-rv8803",
+                .of_match_table = of_match_ptr(rv8803_of_match),
         },
         .probe          = rv8803_probe,
         .remove         = rv8803_remove,