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>

arch/sandbox/dts/test.dts

@@ -240,6 +240,16 @@
 		};
 	};
 
+	syscon@0 {
+		compatible = "sandbox,syscon0";
+		reg = <0x10>;
+	};
+
+	syscon@1 {
+		compatible = "sandbox,syscon1";
+		reg = <0x20>;
+	};
+
 	uart0: serial {
 		compatible = "sandbox,serial";
 		u-boot,dm-pre-reloc;

arch/sandbox/include/asm/test.h

@@ -28,6 +28,14 @@ enum {
 	PERIPH_ID_COUNT,
 };
 
+/* System controller driver data */
+enum {
+	SYSCON0		= 32,
+	SYSCON1,
+
+	SYSCON_COUNT
+};
+
 /**
  * sandbox_i2c_set_test_mode() - set test mode for running unit tests
  *

configs/sandbox_defconfig

@@ -51,3 +51,4 @@ CONFIG_RAM=y
 CONFIG_DM_MMC=y
 CONFIG_LED=y
 CONFIG_LED_GPIO=y
+CONFIG_SYSCON=y

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,
+};

test/dm/Makefile

@@ -27,6 +27,7 @@ obj-$(CONFIG_RESET) += reset.o
 obj-$(CONFIG_DM_RTC) += rtc.o
 obj-$(CONFIG_DM_SPI_FLASH) += sf.o
 obj-$(CONFIG_DM_SPI) += spi.o
+obj-y += syscon.o
 obj-$(CONFIG_DM_USB) += usb.o
 obj-$(CONFIG_DM_PMIC) += pmic.o
 obj-$(CONFIG_DM_REGULATOR) += regulator.o

test/dm/syscon.c

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <syscon.h>
+#include <asm/test.h>
+#include <dm/test.h>
+#include <test/ut.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Base test of system controllers */
+static int dm_test_syscon_base(struct unit_test_state *uts)
+{
+	struct udevice *dev;
+
+	ut_assertok(uclass_get_device(UCLASS_SYSCON, 0, &dev));
+	ut_asserteq(SYSCON0, dev->driver_data);
+
+	ut_assertok(uclass_get_device(UCLASS_SYSCON, 1, &dev));
+	ut_asserteq(SYSCON1, dev->driver_data);
+
+	ut_asserteq(-ENODEV, uclass_get_device(UCLASS_SYSCON, 2, &dev));
+
+	return 0;
+}
+DM_TEST(dm_test_syscon_base, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);