spi: 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".
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

Documentation/devicetree/bindings/spi/efm32-spi.txt

@@ -10,11 +10,12 @@ Required properties:
 - cs-gpios: see spi-bus.txt
 
 Recommended properties :
-- efm32,location: Value to write to the ROUTE register's LOCATION bitfield to
-                  configure the pinmux for the device, see datasheet for values.
-                  If "efm32,location" property is not provided, keeping what is
-                  already configured in the hardware, so its either the reset
-                  default 0 or whatever the bootloader did.
+- energymicro,location: Value to write to the ROUTE register's LOCATION
+                        bitfield to configure the pinmux for the device, see
+                        datasheet for values.
+                        If this property is not provided, keeping what is
+                        already configured in the hardware, so its either the
+                        reset default 0 or whatever the bootloader did.
 
 Example:
 
@@ -26,7 +27,7 @@ spi1: spi@0x4000c400 { /* USART1 */
 	interrupts = <15 16>;
 	clocks = <&cmu 20>;
 	cs-gpios = <&gpio 51 1>; // D3
-	efm32,location = <1>;
+	energymicro,location = <1>;
 	status = "ok";
 
 	ks8851@0 {

drivers/spi/spi-efm32.c

@@ -294,10 +294,16 @@ static void efm32_spi_probe_dt(struct platform_device *pdev,
 	u32 location;
 	int ret;
 
-	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) {
 		dev_dbg(&pdev->dev, "using location %u\n", location);
 	} else {