dm: core: ofnode: Add ofnode_read_bootscript_flash()

ofnode_read_bootscript_flash() reads bootscript address from
/options/u-boot DT node. bootscr-flash-offset and bootscr-flash-size
properties are read and values are filled. When bootscr-flash-size is not
defined, bootscr-flash-offset property is unusable that's why cleaned.
Both of these properties should be defined to function properly.

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/08a3e6c09cce13287c69ad370e409e7f1766b406.1693465465.git.michal.simek@amd.com

4 files changed, 70 insertions, 2 deletions

diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index d93c010bc5..9a863ea732 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -85,6 +85,8 @@
 		u-boot {
 			compatible = "u-boot,config";
 			bootscr-ram-offset = /bits/ 64 <0x12345678>;
+			bootscr-flash-offset = /bits/ 64 <0>;
+			bootscr-flash-size = /bits/ 64 <0x2000>;
 		};
 	};
 
diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index 5076054acd..fb4447c84b 100644
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -1618,6 +1618,40 @@ int ofnode_read_bootscript_address(u64 *bootscr_address, u64 *bootscr_offset)
 	return 0;
 }
 
+int ofnode_read_bootscript_flash(u64 *bootscr_flash_offset,
+				 u64 *bootscr_flash_size)
+{
+	int ret;
+	ofnode uboot;
+
+	*bootscr_flash_offset = 0;
+	*bootscr_flash_size = 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-flash-offset",
+			      bootscr_flash_offset);
+	if (ret)
+		return -EINVAL;
+
+	ret = ofnode_read_u64(uboot, "bootscr-flash-size",
+			      bootscr_flash_size);
+	if (ret)
+		return -EINVAL;
+
+	if (!bootscr_flash_size) {
+		debug("bootscr-flash-size is zero. Ignoring properties!\n");
+		*bootscr_flash_offset = 0;
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 ofnode ofnode_get_phy_node(ofnode node)
 {
 	/* DT node properties that reference a PHY node */
diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index c38596acbd..06ea68e81c 100644
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -1533,6 +1533,27 @@ const char *ofnode_conf_read_str(const char *prop_name);
  */
 int ofnode_read_bootscript_address(u64 *bootscr_address, u64 *bootscr_offset);
 
+/**
+ * ofnode_read_bootscript_flash() - Read bootscr-flash-offset/size
+ *
+ * @bootscr_flash_offset: pointer to 64bit offset where bootscr-flash-offset
+ * property value is stored
+ * @bootscr_flash_size: pointer to 64bit size where bootscr-flash-size property
+ * value is stored
+ *
+ * This reads a bootscr-flash-offset and bootscr-flash-size properties from
+ * the /options/u-boot/ node of the devicetree. bootscr-flash-offset holds
+ * the offset of the boot script file from start of flash. bootscr-flash-size
+ * holds the boot script size in flash. When bootscr-flash-size is not defined,
+ * bootscr-flash-offset property is cleaned.
+ *
+ * This only works with the control FDT.
+ *
+ * Return: 0 if OK, -EINVAL if property is not found or incorrect.
+ */
+int ofnode_read_bootscript_flash(u64 *bootscr_flash_offset,
+				 u64 *bootscr_flash_size);
+
 #else /* CONFIG_DM */
 static inline bool ofnode_conf_read_bool(const char *prop_name)
 {
@@ -1554,6 +1575,12 @@ static inline int ofnode_read_bootscript_address(u64 *bootscr_address, u64 *boot
 	return -EINVAL;
 }
 
+static inline int ofnode_read_bootscript_flash(u64 *bootscr_flash_offset,
+					       u64 *bootscr_flash_size)
+{
+	return -EINVAL;
+}
+
 #endif /* CONFIG_DM */
 
 /**
diff --git a/test/dm/ofnode.c b/test/dm/ofnode.c
index 621a4b4fa3..d71faac0ee 100644
--- a/test/dm/ofnode.c
+++ b/test/dm/ofnode.c
@@ -585,14 +585,19 @@ DM_TEST(dm_test_ofnode_conf, 0);
 
 static int dm_test_ofnode_options(struct unit_test_state *uts)
 {
-	u64 bootscr_address;
-	u64 bootscr_offset;
+	u64 bootscr_address, bootscr_offset;
+	u64 bootscr_flash_offset, bootscr_flash_size;
 
 	ut_assertok(ofnode_read_bootscript_address(&bootscr_address,
 						   &bootscr_offset));
 	ut_asserteq_64(0, bootscr_address);
 	ut_asserteq_64(0x12345678, bootscr_offset);
 
+	ut_assertok(ofnode_read_bootscript_flash(&bootscr_flash_offset,
+						 &bootscr_flash_size));
+	ut_asserteq_64(0, bootscr_flash_offset);
+	ut_asserteq_64(0x2000, bootscr_flash_size);
+
 	return 0;
 }
 DM_TEST(dm_test_ofnode_options, 0);