boards: silabs: xg23_rb4210a: added spi nor

Added external mx25r8035f SPI NOR to xg23_rb4210a board

Signed-off-by: Yishai Jaffe <[email protected]>

Author: yishai1999

boards/silabs/radio_boards/xg23_rb4210a/doc/index.rst

@@ -23,6 +23,7 @@ Hardware
 - Crystals for LFXO (32.768 kHz) and HFXO (39 MHz).
 - Silicon Labs Si7021 relative humidity and temperature sensor
 - Low-power 128x128 pixel Memory LCD
+- Macronix ultra low power 8-Mbit SPI flash (MX25R8035F)
 
 For more information about the EFR32ZG23 SoC and BRD4210A board, refer to these
 documents:
@@ -89,9 +90,13 @@ means Pin number 2 on PORTA, as used in the board's datasheets and manuals.
 +-------+-------------+-------------------------------------+
 | PB3   | GPIO        | Push Button 1                       |
 +-------+-------------+-------------------------------------+
-| PC1   | EUSART1_TX  | Display SPI MOSI                    |
+| PC1   | EUSART1_TX  | Display/Flash SPI MOSI              |
 +-------+-------------+-------------------------------------+
-| PC3   | EUSART1_CLK | Display SPI Clock                   |
+| PC2   | EUSART1_RX  | Flash SPI MISO                      |
++-------+-------------+-------------------------------------+
+| PC3   | EUSART1_CLK | Display/Flash SPI Clock             |
++-------+-------------+-------------------------------------+
+| PC4   | GPIO        | Flash SPI Chip Select               |
 +-------+-------------+-------------------------------------+
 | PC5   | I2C0_SCL    | Si7021 I2C Clock                    |
 +-------+-------------+-------------------------------------+

boards/silabs/radio_boards/xg23_rb4210a/xg23_rb4210a-pinctrl.dtsi

@@ -26,6 +26,11 @@
 			drive-push-pull;
 			output-high;
 		};
+		group1 {
+			pins = <EUSART1_RX_PC2>;
+			input-enable;
+			silabs,input-filter;
+		};
 	};
 
 	i2c0_default: i2c0_default {

boards/silabs/radio_boards/xg23_rb4210a/xg23_rb4210a.dts

@@ -131,7 +131,7 @@
 	#size-cells = <0>;
 	pinctrl-0 = <&eusart1_default>;
 	pinctrl-names = "default";
-	cs-gpios = <&gpioc 8 GPIO_ACTIVE_HIGH>;
+	cs-gpios = <&gpioc 8 GPIO_ACTIVE_HIGH>, <&gpioc 4 GPIO_ACTIVE_LOW>;
 
 	ls0xx_ls013b7dh03: ls0xx@0 {
 		compatible = "sharp,ls0xx";
@@ -143,6 +143,18 @@
 		extcomin-frequency = <60>;
 		disp-en-gpios = <&gpioc 9 GPIO_ACTIVE_HIGH>;
 	};
+
+	mx25r80: mx25r8035f@1 {
+		compatible = "jedec,spi-nor";
+		reg = <1>;
+		spi-max-frequency = <DT_FREQ_M(33)>;
+		size = <DT_SIZE_M(8)>;
+		jedec-id = [c2 28 14];
+		has-dpd;
+		dpd-wakeup-sequence = <30000 20 35000>;
+		t-enter-dpd = <0>;
+		mxicy,mx25r-power-mode = "low-power";
+	};
 };
 
 &i2c0 {