dm: test: Add a test for the ram uclass

Add a test to confirm that we can probe this device and get information on
the available RAM.

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

arch/sandbox/dts/test.dts

@@ -196,6 +196,10 @@
 		};
 	};
 
+	ram {
+		compatible = "sandbox,ram";
+	};
+
 	reset@0 {
 		compatible = "sandbox,warm-reset";
 	};

configs/sandbox_defconfig

@@ -47,3 +47,4 @@ CONFIG_UT_DM=y
 CONFIG_UT_ENV=y
 CONFIG_CLK=y
 CONFIG_RESET=y
+CONFIG_RAM=y

drivers/ram/Makefile

@@ -5,3 +5,4 @@
 # SPDX-License-Identifier:      GPL-2.0+
 #
 obj-$(CONFIG_RAM) += ram-uclass.o
+obj-$(CONFIG_SANDBOX) += sandbox_ram.o

drivers/ram/sandbox_ram.c

@@ -0,0 +1,38 @@
+/*
+ * 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 <ram.h>
+#include <asm/test.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int sandbox_get_info(struct udevice *dev, struct ram_info *info)
+{
+	info->base = 0;
+	info->size = gd->ram_size;
+
+	return 0;
+}
+
+static const struct ram_ops sandbox_ram_ops = {
+	.get_info	= sandbox_get_info,
+};
+
+static const struct udevice_id sandbox_ram_ids[] = {
+	{ .compatible = "sandbox,ram" },
+	{ }
+};
+
+U_BOOT_DRIVER(warm_ram_sandbox) = {
+	.name		= "ram_sandbox",
+	.id		= UCLASS_RAM,
+	.of_match	= sandbox_ram_ids,
+	.ops		= &sandbox_ram_ops,
+};

test/dm/Makefile

@@ -20,6 +20,7 @@ obj-$(CONFIG_DM_ETH) += eth.o
 obj-$(CONFIG_DM_GPIO) += gpio.o
 obj-$(CONFIG_DM_I2C) += i2c.o
 obj-$(CONFIG_DM_PCI) += pci.o
+obj-$(CONFIG_RAM) += ram.o
 obj-$(CONFIG_RESET) += reset.o
 obj-$(CONFIG_DM_RTC) += rtc.o
 obj-$(CONFIG_DM_SPI_FLASH) += sf.o

test/dm/ram.c

@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <ram.h>
+#include <dm/test.h>
+#include <test/ut.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Basic test of the ram uclass */
+static int dm_test_ram_base(struct unit_test_state *uts)
+{
+	struct udevice *dev;
+	struct ram_info info;
+
+	ut_assertok(uclass_get_device(UCLASS_RAM, 0, &dev));
+	ut_assertok(ram_get_info(dev, &info));
+	ut_asserteq(0, info.base);
+	ut_asserteq(gd->ram_size, info.size);
+
+	return 0;
+}
+DM_TEST(dm_test_ram_base, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);