mfd: at91-usart: No need to copy mfd_cell in probe

Use pointer instead.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/at91-usart.c

@@ -27,17 +27,17 @@ static const struct mfd_cell at91_usart_serial_subdev = {
 
 static int at91_usart_mode_probe(struct platform_device *pdev)
 {
-	struct mfd_cell cell;
+	const struct mfd_cell *cell;
 	u32 opmode = AT91_USART_MODE_SERIAL;
 
 	device_property_read_u32(&pdev->dev, "atmel,usart-mode", &opmode);
 
 	switch (opmode) {
 	case AT91_USART_MODE_SPI:
-		cell = at91_usart_spi_subdev;
+		cell = &at91_usart_spi_subdev;
 		break;
 	case AT91_USART_MODE_SERIAL:
-		cell = at91_usart_serial_subdev;
+		cell = &at91_usart_serial_subdev;
 		break;
 	default:
 		dev_err(&pdev->dev, "atmel,usart-mode has an invalid value %u\n",
@@ -45,7 +45,7 @@ static int at91_usart_mode_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, &cell, 1,
+	return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, cell, 1,
 			      NULL, 0, NULL);
 }