The function i2c_match_id() is used to fetch the matching ID from
the i2c_device_id table. This is often used to then retrieve the
matching driver_data. This can be done in one step with the helper
i2c_get_match_data().

This helper has another benefit:
 * It also checks for device match data, which allows for OF based
   probing. That means we do not have to manually check those first
   and can remove that check.

As i2c_get_match_data() return NULL/0 on failure which also matches
the enum for "cffps1", switch around the enum order so cffps_unknown
is index 0 and existing behavior is preserved.

Signed-off-by: Andrew Davis <afd@ti.com>
---
 drivers/hwmon/pmbus/ibm-cffps.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
index d05ef7a968a96..6c7256d997f46 100644
--- a/drivers/hwmon/pmbus/ibm-cffps.c
+++ b/drivers/hwmon/pmbus/ibm-cffps.c
@@ -58,7 +58,7 @@ enum {
 	CFFPS_DEBUGFS_NUM_ENTRIES
 };
 
-enum versions { cffps1, cffps2, cffps_unknown };
+enum versions { cffps_unknown, cffps1, cffps2 };
 
 struct ibm_cffps {
 	enum versions version;
@@ -482,19 +482,9 @@ MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
 static int ibm_cffps_probe(struct i2c_client *client)
 {
 	int i, rc;
-	enum versions vs = cffps_unknown;
+	enum versions vs = (uintptr_t)i2c_get_match_data(client);
 	struct dentry *debugfs;
 	struct ibm_cffps *psu;
-	const void *md = of_device_get_match_data(&client->dev);
-	const struct i2c_device_id *id;
-
-	if (md) {
-		vs = (uintptr_t)md;
-	} else {
-		id = i2c_match_id(ibm_cffps_id, client);
-		if (id)
-			vs = (enum versions)id->driver_data;
-	}
 
 	if (vs == cffps_unknown) {
 		u16 ccin_revision = 0;
@@ -534,7 +524,7 @@ static int ibm_cffps_probe(struct i2c_client *client)
 		}
 
 		/* Set the client name to include the version number. */
-		snprintf(client->name, I2C_NAME_SIZE, "cffps%d", vs + 1);
+		snprintf(client->name, I2C_NAME_SIZE, "cffps%d", vs);
 	}
 
 	client->dev.platform_data = &ibm_cffps_pdata;
-- 
2.39.2