hwrng: optee - Make use of tee bus methods

The tee bus got dedicated callbacks for probe and remove.
Make use of these. This fixes a runtime warning about the driver needing
to be converted to the bus methods.

Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

Author: ukleinek

drivers/char/hw_random/optee-rng.c

@@ -211,9 +211,9 @@ static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
 		return 0;
 }
 
-static int optee_rng_probe(struct device *dev)
+static int optee_rng_probe(struct tee_client_device *rng_device)
 {
-	struct tee_client_device *rng_device = to_tee_client_device(dev);
+	struct device *dev = &rng_device->dev;
 	int ret = 0, err = -ENODEV;
 	struct tee_ioctl_open_session_arg sess_arg;
 
@@ -261,12 +261,10 @@ static int optee_rng_probe(struct device *dev)
 	return err;
 }
 
-static int optee_rng_remove(struct device *dev)
+static void optee_rng_remove(struct tee_client_device *tee_dev)
 {
 	tee_client_close_session(pvt_data.ctx, pvt_data.session_id);
 	tee_client_close_context(pvt_data.ctx);
-
-	return 0;
 }
 
 static const struct tee_client_device_id optee_rng_id_table[] = {
@@ -278,11 +276,11 @@ static const struct tee_client_device_id optee_rng_id_table[] = {
 MODULE_DEVICE_TABLE(tee, optee_rng_id_table);
 
 static struct tee_client_driver optee_rng_driver = {
+	.probe		= optee_rng_probe,
+	.remove		= optee_rng_remove,
 	.id_table	= optee_rng_id_table,
 	.driver		= {
 		.name		= DRIVER_NAME,
-		.probe		= optee_rng_probe,
-		.remove		= optee_rng_remove,
 	},
 };