sandbox: Use the reset driver to handle reset

Move sandbox over to use the reset uclass for reset, instead of a direct
call to do_reset(). This allows us to add tests.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/sandbox/cpu/cpu.c

@@ -20,7 +20,7 @@ static struct udevice *map_dev;
 unsigned long map_len;
 #endif
 
-void reset_cpu(ulong ignored)
+void sandbox_exit(void)
 {
 	/* Do this here while it still has an effect */
 	os_fd_restore();
@@ -34,13 +34,6 @@ void reset_cpu(ulong ignored)
 	os_exit(0);
 }
 
-int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
-{
-	reset_cpu(0);
-
-	return 0;
-}
-
 /* delay x useconds */
 void __udelay(unsigned long usec)
 {

arch/sandbox/dts/test.dts

@@ -196,6 +196,14 @@
 		};
 	};
 
+	reset@0 {
+		compatible = "sandbox,warm-reset";
+	};
+
+	reset@1 {
+		compatible = "sandbox,reset";
+	};
+
 	spi@0 {
 		#address-cells = <1>;
 		#size-cells = <0>;

arch/sandbox/include/asm/u-boot-sandbox.h

@@ -83,4 +83,7 @@ void sandbox_set_enable_pci_map(int enable);
  */
 int sandbox_read_fdt_from_file(void);
 
+/* Exit sandbox (quit U-Boot) */
+void sandbox_exit(void);
+
 #endif	/* _U_BOOT_SANDBOX_H_ */

configs/sandbox_defconfig

@@ -46,3 +46,4 @@ CONFIG_UT_TIME=y
 CONFIG_UT_DM=y
 CONFIG_UT_ENV=y
 CONFIG_CLK=y
+CONFIG_RESET=y

drivers/misc/reset_sandbox.c

@@ -51,7 +51,7 @@ static int sandbox_reset_request(struct udevice *dev, enum reset_t type)
 		state->last_reset = type;
 		if (!state->reset_allowed[type])
 			return -EACCES;
-		/* TODO: sandbox_exit(); */
+		sandbox_exit();
 		break;
 	default:
 		return -ENOSYS;