dm: test: Add a test for the system controller uclass

Add a test to confirm that we can access system controllers and find their
driver data.

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

drivers/misc/Makefile

@@ -29,6 +29,7 @@ endif
 obj-$(CONFIG_SMSC_LPC47M) += smsc_lpc47m.o
 obj-$(CONFIG_STATUS_LED) += status_led.o
 obj-$(CONFIG_SANDBOX) += swap_case.o
+obj-$(CONFIG_SANDBOX) += syscon_sandbox.o
 obj-$(CONFIG_TWL4030_LED) += twl4030_led.o
 obj-$(CONFIG_FSL_IFC) += fsl_ifc.o
 obj-$(CONFIG_FSL_SEC_MON) += fsl_sec_mon.o

drivers/misc/syscon_sandbox.c

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <syscon.h>
+#include <asm/test.h>
+#include <dm/lists.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const struct udevice_id sandbox_syscon_ids[] = {
+	{ .compatible = "sandbox,syscon0", .data = SYSCON0 },
+	{ .compatible = "sandbox,syscon1", .data = SYSCON1 },
+	{ }
+};
+
+U_BOOT_DRIVER(sandbox_syscon) = {
+	.name	= "sandbox_syscon",
+	.id	= UCLASS_SYSCON,
+	.of_match = sandbox_syscon_ids,
+};