sandbox: Add and build AXI bus and device

Add test AXI drivers to the sandbox.
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Mario Six <mario.six@gdsys.cc>

arch/sandbox/dts/sandbox.dts

@@ -11,6 +11,7 @@
 		i2c0 = &i2c_0;
 		pci0 = &pci;
 		rtc0 = &rtc_0;
+		axi0 = &axi;
 	};
 
 	chosen {
@@ -311,6 +312,16 @@
 			};
 		};
 	};
+
+	axi: axi@0 {
+		compatible = "sandbox,axi";
+		#address-cells = <0x1>;
+		#size-cells = <0x1>;
+		store@0 {
+			compatible = "sandbox,sandbox_store";
+			reg = <0x0 0x400>;
+		};
+	};
 };
 
 #include "cros-ec-keyboard.dtsi"

arch/sandbox/dts/test.dts

@@ -36,6 +36,7 @@
 		usb0 = &usb_0;
 		usb1 = &usb_1;
 		usb2 = &usb_2;
+		axi0 = &axi;
 	};
 
 	a-test {
@@ -552,6 +553,16 @@
 		compatible = "sandbox,wdt";
 	};
 
+	axi: axi@0 {
+		compatible = "sandbox,axi";
+		#address-cells = <0x1>;
+		#size-cells = <0x1>;
+		store@0 {
+			compatible = "sandbox,sandbox_store";
+			reg = <0x0 0x400>;
+		};
+	};
+
 	chosen {
 		#address-cells = <1>;
 		#size-cells = <1>;

configs/sandbox_defconfig

@@ -45,6 +45,7 @@ CONFIG_CMD_REMOTEPROC=y
 CONFIG_CMD_SF=y
 CONFIG_CMD_SPI=y
 CONFIG_CMD_USB=y
+CONFIG_CMD_AXI=y
 CONFIG_CMD_TFTPPUT=y
 CONFIG_CMD_TFTPSRV=y
 CONFIG_CMD_RARP=y
@@ -80,6 +81,8 @@ CONFIG_DEVRES=y
 CONFIG_DEBUG_DEVRES=y
 CONFIG_ADC=y
 CONFIG_ADC_SANDBOX=y
+CONFIG_AXI=y
+CONFIG_AXI_SANDBOX=y
 CONFIG_CLK=y
 CONFIG_CPU=y
 CONFIG_DM_DEMO=y