boards: efr32_slwstk6061a: Add support for spi nor flash

This commit adds support for the on-board flash MX25R8035F that is
directly connected to the efr32fg soc.

Signed-off-by: Christian Taedcke <[email protected]>

Author: chrta

boards/arm/efr32_slwstk6061a/doc/index.rst

@@ -69,6 +69,8 @@ The efr32_slwstk6061a board configuration supports the following hardware featur
 | UART      | on-chip    | serial port-polling;                |
 |           |            | serial port-interrupt               |
 +-----------+------------+-------------------------------------+
+| SPI(M)    | on-chip    | spi port-polling                    |
++-----------+------------+-------------------------------------+
 
 The default configuration can be found in the defconfig file:
 
@@ -103,6 +105,14 @@ means Pin number 2 on PORTA, as used in the board's datasheets and manuals.
 +-------+-------------+-------------------------------------+
 | PA1   | USART0_RX   | UART Console EFM_BC_RX US0_RX #0    |
 +-------+-------------+-------------------------------------+
+| PC6   | SPI_MOSI    | Flash MOSI US1_TX #11               |
++-------+-------------+-------------------------------------+
+| PC7   | SPI_MISO    | Flash MISO US1_RX #11               |
++-------+-------------+-------------------------------------+
+| PC8   | SPI_SCLK    | Flash SCLK US1_CLK #11              |
++-------+-------------+-------------------------------------+
+| PA4   | SPI_CS      | Flash Chip Select (GPIO)            |
++-------+-------------+-------------------------------------+
 
 System Clock
 ============

boards/arm/efr32_slwstk6061a/efr32_slwstk6061a.dts

@@ -66,6 +66,31 @@
 	status = "okay";
 };
 
+&usart1 {
+	compatible = "silabs,gecko-spi-usart";
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	location-rx = <GECKO_LOCATION(11) GECKO_PORT_C GECKO_PIN(7)>;
+	location-tx = <GECKO_LOCATION(11) GECKO_PORT_C GECKO_PIN(6)>;
+	location-clk = <GECKO_LOCATION(11) GECKO_PORT_C GECKO_PIN(8)>;
+
+	cs-gpios = <&gpioa 4 0>;
+
+	status = "okay";
+
+	mx25r80: mx25r8035f@0 {
+		compatible = "jedec,spi-nor";
+		label = "MX25R8035F";
+		reg = <0>;
+		spi-max-frequency = <80000000>;
+		size = <0x800000>;
+		has-be32k;
+		jedec-id = [c2 28 14];
+	};
+};
+
 &rtcc0 {
 	prescaler = <1>;
 	status = "okay";

boards/arm/efr32_slwstk6061a/efr32_slwstk6061a.yaml

@@ -11,6 +11,7 @@ toolchain:
 supported:
   - gpio
   - nvs
+  - spi
 testing:
   ignore_tags:
     - net

soc/arm/silabs_exx32/efr32fg1p/Kconfig.defconfig.efr32fg1p

@@ -30,3 +30,10 @@ config SOC_FLASH_GECKO
 	default y
 
 endif # FLASH
+
+if SPI
+
+config SPI_GECKO
+	default y
+
+endif # SPI