dm: core: implement ofnode_options helpers

Implement ofnode_options helpers to read options in /options/u-boot to
adapt to the new way to declare options as described in [1].

[1] dtschema/schemas/options/u-boot.yaml

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/core/ofnode.c

@@ -1735,6 +1735,39 @@ const char *ofnode_conf_read_str(const char *prop_name)
 	return ofnode_read_string(node, prop_name);
 }
 
+bool ofnode_options_read_bool(const char *prop_name)
+{
+	ofnode uboot;
+
+	uboot = ofnode_path("/options/u-boot");
+	if (!ofnode_valid(uboot))
+		return false;
+
+	return ofnode_read_bool(uboot, prop_name);
+}
+
+int ofnode_options_read_int(const char *prop_name, int default_val)
+{
+	ofnode uboot;
+
+	uboot = ofnode_path("/options/u-boot");
+	if (!ofnode_valid(uboot))
+		return default_val;
+
+	return ofnode_read_u32_default(uboot, prop_name, default_val);
+}
+
+const char *ofnode_options_read_str(const char *prop_name)
+{
+	ofnode uboot;
+
+	uboot = ofnode_path("/options/u-boot");
+	if (!ofnode_valid(uboot))
+		return NULL;
+
+	return ofnode_read_string(uboot, prop_name);
+}
+
 int ofnode_read_bootscript_address(u64 *bootscr_address, u64 *bootscr_offset)
 {
 	int ret;

include/dm/ofnode.h

@@ -1587,6 +1587,47 @@ int ofnode_conf_read_int(const char *prop_name, int default_val);
  */
 const char *ofnode_conf_read_str(const char *prop_name);
 
+/**
+ * ofnode_options_read_bool() - Read a boolean value from the U-Boot options
+ *
+ * This reads a property from the /options/u-boot/ node of the devicetree.
+ *
+ * This only works with the control FDT.
+ *
+ * See dtschema/schemas/options/u-boot.yaml in dt-schema project for bindings
+ *
+ * @prop_name:	property name to look up
+ * Return: true, if it exists, false if not
+ */
+bool ofnode_options_read_bool(const char *prop_name);
+
+/**
+ * ofnode_options_read_int() - Read an integer value from the U-Boot options
+ *
+ * This reads a property from the /options/u-boot/ node of the devicetree.
+ *
+ * See dtschema/schemas/options/u-boot.yaml in dt-schema project for bindings
+ *
+ * @prop_name: property name to look up
+ * @default_val: default value to return if the property is not found
+ * Return: integer value, if found, or @default_val if not
+ */
+int ofnode_options_read_int(const char *prop_name, int default_val);
+
+/**
+ * ofnode_options_read_str() - Read a string value from the U-Boot options
+ *
+ * This reads a property from the /options/u-boot/ node of the devicetree.
+ *
+ * This only works with the control FDT.
+ *
+ * See dtschema/schemas/options/u-boot.yaml in dt-schema project for bindings
+ *
+ * @prop_name: property name to look up
+ * Return: string value, if found, or NULL if not
+ */
+const char *ofnode_options_read_str(const char *prop_name);
+
 /**
  * ofnode_read_bootscript_address() - Read bootscr-address or bootscr-ram-offset
  *