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+.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
+
+.. _v4l2-meta-fmt-vsp1-hgo:
+
+*******************************
+V4L2_META_FMT_VSP1_HGO ('VSPH')
+*******************************
+
+Renesas R-Car VSP1 1-D Histogram Data
+
+
+Description
+===========
+
+This format describes histogram data generated by the Renesas R-Car VSP1 1-D
+Histogram (HGO) engine.
+
+The VSP1 HGO is a histogram computation engine that can operate on RGB, YCrCb
+or HSV data. It operates on a possibly cropped and subsampled input image and
+computes the minimum, maximum and sum of all pixels as well as per-channel
+histograms.
+
+The HGO can compute histograms independently per channel, on the maximum of the
+three channels (RGB data only) or on the Y channel only (YCbCr only). It can
+additionally output the histogram with 64 or 256 bins, resulting in four
+possible modes of operation.
+
+- In *64 bins normal mode*, the HGO operates on the three channels independently
+  to compute three 64-bins histograms. RGB, YCbCr and HSV image formats are
+  supported.
+- In *64 bins maximum mode*, the HGO operates on the maximum of the (R, G, B)
+  channels to compute a single 64-bins histogram. Only the RGB image format is
+  supported.
+- In *256 bins normal mode*, the HGO operates on the Y channel to compute a
+  single 256-bins histogram. Only the YCbCr image format is supported.
+- In *256 bins maximum mode*, the HGO operates on the maximum of the (R, G, B)
+  channels to compute a single 256-bins histogram. Only the RGB image format is
+  supported.
+
+**Byte Order.**
+All data is stored in memory in little endian format. Each cell in the tables
+contains one byte.
+
+.. flat-table:: VSP1 HGO Data - 64 Bins, Normal Mode (792 bytes)
+    :header-rows:  2
+    :stub-columns: 0
+
+    * - Offset
+      - :cspan:`4` Memory
+    * -
+      - [31:24]
+      - [23:16]
+      - [15:8]
+      - [7:0]
+    * - 0
+      -
+      - R/Cr/H max [7:0]
+      -
+      - R/Cr/H min [7:0]
+    * - 4
+      -
+      - G/Y/S max [7:0]
+      -
+      - G/Y/S min [7:0]
+    * - 8
+      -
+      - B/Cb/V max [7:0]
+      -
+      - B/Cb/V min [7:0]
+    * - 12
+      - :cspan:`4` R/Cr/H sum [31:0]
+    * - 16
+      - :cspan:`4` G/Y/S sum [31:0]
+    * - 20
+      - :cspan:`4` B/Cb/V sum [31:0]
+    * - 24
+      - :cspan:`4` R/Cr/H bin 0 [31:0]
+    * -
+      - :cspan:`4` ...
+    * - 276
+      - :cspan:`4` R/Cr/H bin 63 [31:0]
+    * - 280
+      - :cspan:`4` G/Y/S bin 0 [31:0]
+    * -
+      - :cspan:`4` ...
+    * - 532
+      - :cspan:`4` G/Y/S bin 63 [31:0]
+    * - 536
+      - :cspan:`4` B/Cb/V bin 0 [31:0]
+    * -
+      - :cspan:`4` ...
+    * - 788
+      - :cspan:`4` B/Cb/V bin 63 [31:0]
+
+.. flat-table:: VSP1 HGO Data - 64 Bins, Max Mode (264 bytes)
+    :header-rows:  2
+    :stub-columns: 0
+
+    * - Offset
+      - :cspan:`4` Memory
+    * -
+      - [31:24]
+      - [23:16]
+      - [15:8]
+      - [7:0]
+    * - 0
+      -
+      - max(R,G,B) max [7:0]
+      -
+      - max(R,G,B) min [7:0]
+    * - 4
+      - :cspan:`4` max(R,G,B) sum [31:0]
+    * - 8
+      - :cspan:`4` max(R,G,B) bin 0 [31:0]
+    * -
+      - :cspan:`4` ...
+    * - 260
+      - :cspan:`4` max(R,G,B) bin 63 [31:0]
+
+.. flat-table:: VSP1 HGO Data - 256 Bins, Normal Mode (1032 bytes)
+    :header-rows:  2
+    :stub-columns: 0
+
+    * - Offset
+      - :cspan:`4` Memory
+    * -
+      - [31:24]
+      - [23:16]
+      - [15:8]
+      - [7:0]
+    * - 0
+      -
+      - Y max [7:0]
+      -
+      - Y min [7:0]
+    * - 4
+      - :cspan:`4` Y sum [31:0]
+    * - 8
+      - :cspan:`4` Y bin 0 [31:0]
+    * -
+      - :cspan:`4` ...
+    * - 1028
+      - :cspan:`4` Y bin 255 [31:0]
+
+.. flat-table:: VSP1 HGO Data - 256 Bins, Max Mode (1032 bytes)
+    :header-rows:  2
+    :stub-columns: 0
+
+    * - Offset
+      - :cspan:`4` Memory
+    * -
+      - [31:24]
+      - [23:16]
+      - [15:8]
+      - [7:0]
+    * - 0
+      -
+      - max(R,G,B) max [7:0]
+      -
+      - max(R,G,B) min [7:0]
+    * - 4
+      - :cspan:`4` max(R,G,B) sum [31:0]
+    * - 8
+      - :cspan:`4` max(R,G,B) bin 0 [31:0]
+    * -
+      - :cspan:`4` ...
+    * - 1028
+      - :cspan:`4` max(R,G,B) bin 255 [31:0]