[PATCH v6 6/6] doc: dtbinding: Update documentation for Generic Firmware loader

[Christian Marangi <ansuelsmth@gmail.com>]

Update documentation for Generic Firmware loader, generalize it from FS
specific and add new property and example for FIP loader.

Also add details on the usage of 'phandlepart', 'mtdpart' and 'ubivol'
property.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 .../misc/{fs_loader.txt => fw_loader.txt}     | 29 +++++++++++++++++--
 1 file changed, 26 insertions(+), 3 deletions(-)
 rename doc/device-tree-bindings/misc/{fs_loader.txt => fw_loader.txt} (60%)

diff --git a/doc/device-tree-bindings/misc/fs_loader.txt b/doc/device-tree-bindings/misc/fw_loader.txt
similarity index 60%
rename from doc/device-tree-bindings/misc/fs_loader.txt
rename to doc/device-tree-bindings/misc/fw_loader.txt
index 542be4b25a0a..9b00b2c887c0 100644
--- a/doc/device-tree-bindings/misc/fs_loader.txt
+++ b/doc/device-tree-bindings/misc/fw_loader.txt
@@ -1,17 +1,23 @@
-* File system firmware loader
+* Generic Firmware loader
 
 Required properties:
 --------------------
 
-- compatible: should contain "u-boot,fs-loader"
+- compatible: should contain "u-boot,fs-loader" or "u-boot,fip-loader"
 - phandlepart: which block storage device and partition the image loading from,
 	       this property is required for mmc, usb and sata. This is unsigned
 	       32-bit array. For example phandlepart=<&mmc_0 1>, meaning use
 	       that MMC0 node pointer, partition 1.
-- mdtpart: which partition of ubi the image loading from, this property is
+- mtdpart: which partition of ubi the image loading from, this property is
 	   required for ubi and mounting.
 - ubivol: which volume of ubi the image loading from, this property is required
 	  for ubi and mounting.
+- partoffset: valid ONLY for "u-boot,fip-loader". Offset of the partition to
+	      parse the FIP partition from.
+
+Either 'phandlepart' or 'mtdpart' can be used. For Block device, 'phandlepart'
+should be used and for MTD device, 'mtdpart' should be used. With UBI device,
+in addition to 'mtdpart' also 'ubivol' is required.
 
 Example of storage device and partition search set for mmc, usb, sata and
 ubi in device tree source as shown in below:
@@ -46,3 +52,20 @@ ubi in device tree source as shown in below:
 		mtdpart = "UBI",
 		ubivol = "ubi0";
 	};
+
+	Example for FIP from eMMC:
+	fs_loader4: fip-loader@4 {
+		bootph-all;
+		compatible = "u-boot,fip-loader";
+		phandlepart = <&mmc0 0>;
+		partoffset = <0x100>;
+	};
+
+	Example for FIP from ubi:
+	fs_loader4: fip-loader@4 {
+		bootph-all;
+		compatible = "u-boot,fip-loader";
+		mtdpart = "ubi",
+		ubivol = "bl31";
+	};
+
-- 
2.53.0