rtc: isl1208: Make similar I2C and DT-based matching table

The isl1208_id[].driver_data could store a pointer to the config,
like for DT-based matching, making I2C and DT-based matching
more similar.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230623140948.384762-8-biju.das.jz@bp.renesas.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: bijudas

drivers/rtc/rtc-isl1208.c

@@ -90,10 +90,10 @@ static const struct isl1208_config {
 };
 
 static const struct i2c_device_id isl1208_id[] = {
-	{ "isl1208", TYPE_ISL1208 },
-	{ "isl1209", TYPE_ISL1209 },
-	{ "isl1218", TYPE_ISL1218 },
-	{ "isl1219", TYPE_ISL1219 },
+	{ "isl1208", .driver_data = (kernel_ulong_t)&isl1208_configs[TYPE_ISL1208] },
+	{ "isl1209", .driver_data = (kernel_ulong_t)&isl1208_configs[TYPE_ISL1209] },
+	{ "isl1218", .driver_data = (kernel_ulong_t)&isl1208_configs[TYPE_ISL1218] },
+	{ "isl1219", .driver_data = (kernel_ulong_t)&isl1208_configs[TYPE_ISL1219] },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, isl1208_id);
@@ -822,9 +822,9 @@ isl1208_probe(struct i2c_client *client)
 	} else {
 		const struct i2c_device_id *id = i2c_match_id(isl1208_id, client);
 
-		if (id->driver_data >= ISL_LAST_ID)
+		if (!id)
 			return -ENODEV;
-		isl1208->config = &isl1208_configs[id->driver_data];
+		isl1208->config = (struct isl1208_config *)id->driver_data;
 	}
 
 	isl1208->rtc = devm_rtc_allocate_device(&client->dev);