dm: core: Update ofnode_read_fmap_entry() to read hashes

At present this function uses the old format for reading hashes. Add
support for the current format.

Add a test while we are here.

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

test/dm/Makefile

@@ -42,6 +42,7 @@ obj-y += fdtdec.o
 obj-$(CONFIG_UT_DM) += nop.o
 obj-y += ofnode.o
 obj-y += ofread.o
+obj-y += of_extra.o
 obj-$(CONFIG_OSD) += osd.o
 obj-$(CONFIG_DM_VIDEO) += panel.o
 obj-$(CONFIG_DM_PCI) += pci.o

test/dm/of_extra.c

@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2021 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/of_extra.h>
+#include <dm/test.h>
+#include <test/ut.h>
+#include <u-boot/sha256.h>
+
+static int dm_test_ofnode_read_fmap_entry(struct unit_test_state *uts)
+{
+	const char hash_expect[] = {
+		0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+		0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+		0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+		0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+	};
+	struct fmap_entry entry;
+	ofnode node;
+
+	node = ofnode_path("/cros-ec/flash/wp-ro");
+	ut_assertok(ofnode_read_fmap_entry(node, &entry));
+	ut_asserteq(0xf000, entry.offset);
+	ut_asserteq(0x1000, entry.length);
+	ut_asserteq(0x884, entry.used);
+	ut_asserteq(FMAP_COMPRESS_LZ4, entry.compress_algo);
+	ut_asserteq(0xcf8, entry.unc_length);
+	ut_asserteq(FMAP_HASH_SHA256, entry.hash_algo);
+	ut_asserteq(SHA256_SUM_LEN, entry.hash_size);
+	ut_asserteq_mem(hash_expect, entry.hash, SHA256_SUM_LEN);
+
+	return 0;
+}
+DM_TEST(dm_test_ofnode_read_fmap_entry, 0);