dm: core: ofnode: Add ofnode_read_bootscript_address()

ofnode_read_bootscript_address() reads bootscript address from
/options/u-boot DT node. bootscr-address or bootscr-ram-offset properties
are read and values are filled. bootscr-address has higher priority than
bootscr-ram-offset and the only one should be described in DT.

Also add test to cover this new function.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/23be3838502efef61803c90ef6e8b32bbd6ede41.1693465140.git.michal.simek@amd.com

arch/sandbox/dts/test.dts

@@ -81,6 +81,13 @@
 		};
 	};
 
+	options {
+		u-boot {
+			compatible = "u-boot,config";
+			bootscr-ram-offset = /bits/ 64 <0x12345678>;
+		};
+	};
+
 	bootstd {
 		bootph-verify;
 		compatible = "u-boot,boot-std";

drivers/core/ofnode.c

@@ -1593,6 +1593,31 @@ const char *ofnode_conf_read_str(const char *prop_name)
 	return ofnode_read_string(node, prop_name);
 }
 
+int ofnode_read_bootscript_address(u64 *bootscr_address, u64 *bootscr_offset)
+{
+	int ret;
+	ofnode uboot;
+
+	*bootscr_address = 0;
+	*bootscr_offset = 0;
+
+	uboot = ofnode_path("/options/u-boot");
+	if (!ofnode_valid(uboot)) {
+		printf("%s: Missing /u-boot node\n", __func__);
+		return -EINVAL;
+	}
+
+	ret = ofnode_read_u64(uboot, "bootscr-address", bootscr_address);
+	if (ret) {
+		ret = ofnode_read_u64(uboot, "bootscr-ram-offset",
+				      bootscr_offset);
+		if (ret)
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
 ofnode ofnode_get_phy_node(ofnode node)
 {
 	/* DT node properties that reference a PHY node */

include/dm/ofnode.h

@@ -20,6 +20,7 @@
 struct resource;
 
 #include <dm/ofnode_decl.h>
+#include <linux/errno.h>
 
 struct ofnode_phandle_args {
 	ofnode node;
@@ -1512,6 +1513,26 @@ int ofnode_conf_read_int(const char *prop_name, int default_val);
  */
 const char *ofnode_conf_read_str(const char *prop_name);
 
+/**
+ * ofnode_read_bootscript_address() - Read bootscr-address or bootscr-ram-offset
+ *
+ * @bootscr_address: pointer to 64bit address where bootscr-address property value
+ * is stored
+ * @bootscr_offset:  pointer to 64bit offset address where bootscr-ram-offset
+ * property value is stored
+ *
+ * This reads a bootscr-address or bootscr-ram-offset property from
+ * the /options/u-boot/ node of the devicetree. bootscr-address holds the full
+ * address of the boot script file. bootscr-ram-offset holds the boot script
+ * file offset from the start of the ram base address. When bootscr-address is
+ * defined, bootscr-ram-offset property is ignored.
+ *
+ * This only works with the control FDT.
+ *
+ * Return: 0 if OK, -EINVAL if property is not found.
+ */
+int ofnode_read_bootscript_address(u64 *bootscr_address, u64 *bootscr_offset);
+
 #else /* CONFIG_DM */
 static inline bool ofnode_conf_read_bool(const char *prop_name)
 {
@@ -1528,6 +1549,11 @@ static inline const char *ofnode_conf_read_str(const char *prop_name)
 	return NULL;
 }
 
+static inline int ofnode_read_bootscript_address(u64 *bootscr_address, u64 *bootscr_offset)
+{
+	return -EINVAL;
+}
+
 #endif /* CONFIG_DM */
 
 /**

test/dm/ofnode.c

@@ -583,6 +583,20 @@ static int dm_test_ofnode_conf(struct unit_test_state *uts)
 }
 DM_TEST(dm_test_ofnode_conf, 0);
 
+static int dm_test_ofnode_options(struct unit_test_state *uts)
+{
+	u64 bootscr_address;
+	u64 bootscr_offset;
+
+	ut_assertok(ofnode_read_bootscript_address(&bootscr_address,
+						   &bootscr_offset));
+	ut_asserteq_64(0, bootscr_address);
+	ut_asserteq_64(0x12345678, bootscr_offset);
+
+	return 0;
+}
+DM_TEST(dm_test_ofnode_options, 0);
+
 static int dm_test_ofnode_for_each_compatible_node(struct unit_test_state *uts)
 {
 	const char compatible[] = "denx,u-boot-fdt-test";