ARM: dts: at91: usb_a9g20: add SPI EEPROM

Schematics and board layout indicate that versions with a dataflash
instead of an EEPROM might exist. Let's handle that once we have
hardware to test.

Signed-off-by: Wolfram Sang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Claudiu Beznea <[email protected]>

Author: Wolfram Sang

arch/arm/boot/dts/microchip/usb_a9g20.dts

@@ -11,3 +11,17 @@
 	model = "Calao USB A9G20";
 	compatible = "calao,usb-a9g20", "atmel,at91sam9g20", "atmel,at91sam9";
 };
+
+&spi0 {
+	cs-gpios = <&pioC 11 GPIO_ACTIVE_LOW>;
+	status = "okay";
+	/* TODO: Some revisions might have a dataflash here instead of an EEPROM */
+	eeprom@0 {
+		compatible = "st,m95640", "atmel,at25";
+		reg = <0>;
+		spi-max-frequency = <2000000>;
+		size = <8192>;
+		pagesize = <32>;
+		address-width = <16>;
+	};
+};