serial: efm32: correct namespacing of location property

Olof Johansson pointed out that usually the company name is picked as
namespace prefix to specific properties. So expect "energymicro,location"
but fall back to the previously introduced name "efm32,location".

Cc: Olof Johansson <olof@lixom.net>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/serial/efm32-uart.txt

@@ -6,7 +6,7 @@ Required properties:
 - interrupts : Should contain uart interrupt
 
 Optional properties:
-- efm32,location : Decides the location of the USART I/O pins.
+- energymicro,location : Decides the location of the USART I/O pins.
   Allowed range : [0 .. 5]
   Default: 0
 
@@ -16,5 +16,5 @@ uart@0x4000c400 {
 	compatible = "energymicro,efm32-uart";
 	reg = <0x4000c400 0x400>;
 	interrupts = <15>;
-	efm32,location = <0>;
+	energymicro,location = <0>;
 };

drivers/tty/serial/efm32-uart.c

@@ -665,10 +665,16 @@ static int efm32_uart_probe_dt(struct platform_device *pdev,
 	if (!np)
 		return 1;
 
-	ret = of_property_read_u32(np, "efm32,location", &location);
+	ret = of_property_read_u32(np, "energymicro,location", &location);
+
+	if (ret)
+		/* fall back to wrongly namespaced property */
+		ret = of_property_read_u32(np, "efm32,location", &location);
+
 	if (ret)
 		/* fall back to old and (wrongly) generic property "location" */
 		ret = of_property_read_u32(np, "location", &location);
+
 	if (!ret) {
 		if (location > 5) {
 			dev_err(&pdev->dev, "invalid location\n");