rtc: rs5c372: 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, 36 insertions, 1 deletions

diff --git a/drivers/rtc/rtc-rs5c372.c b/drivers/rtc/rtc-rs5c372.c
index c8c757466783..d4eff8d7131f 100644
--- a/drivers/rtc/rtc-rs5c372.c
+++ b/drivers/rtc/rtc-rs5c372.c
@@ -15,6 +15,7 @@
 #include <linux/bcd.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 
 /*
  * Ricoh has a family of I2C based RTCs, which differ only slightly from
@@ -83,6 +84,35 @@ static const struct i2c_device_id rs5c372_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, rs5c372_id);
 
+static const struct of_device_id rs5c372_of_match[] = {
+        {
+                .compatible = "ricoh,r2025sd",
+                .data = (void *)rtc_r2025sd
+        },
+        {
+                .compatible = "ricoh,r2221tl",
+                .data = (void *)rtc_r2221tl
+        },
+        {
+                .compatible = "ricoh,rs5c372a",
+                .data = (void *)rtc_rs5c372a
+        },
+        {
+                .compatible = "ricoh,rs5c372b",
+                .data = (void *)rtc_rs5c372b
+        },
+        {
+                .compatible = "ricoh,rv5c386",
+                .data = (void *)rtc_rv5c386
+        },
+        {
+                .compatible = "ricoh,rv5c387a",
+                .data = (void *)rtc_rv5c387a
+        },
+        { }
+};
+MODULE_DEVICE_TABLE(of, rs5c372_of_match);
+
 /* REVISIT:  this assumes that:
  *  - we're in the 21st century, so it's safe to ignore the century
  *    bit for rv5c38[67] (REG_MONTH bit 7);
@@ -581,7 +611,11 @@ static int rs5c372_probe(struct i2c_client *client,
 
         rs5c372->client = client;
         i2c_set_clientdata(client, rs5c372);
-        rs5c372->type = id->driver_data;
+        if (client->dev.of_node)
+                rs5c372->type = (enum rtc_type)
+                        of_device_get_match_data(&client->dev);
+        else
+                rs5c372->type = id->driver_data;
 
         /* we read registers 0x0f then 0x00-0x0f; skip the first one */
         rs5c372->regs = &rs5c372->buf[1];
@@ -673,6 +707,7 @@ static int rs5c372_remove(struct i2c_client *client)
 static struct i2c_driver rs5c372_driver = {
         .driver         = {
                 .name   = "rtc-rs5c372",
+                .of_match_table = of_match_ptr(rs5c372_of_match),
         },
         .probe          = rs5c372_probe,
         .remove         = rs5c372_remove,