media: uapi: Add controls for Mali-C55 ISP

Add definitions and documentation for the custom control that will
be needed by the Mali-C55 ISP driver. This will be a read only
bitmask of the driver's capabilities, informing userspace of which
blocks are fitted and which are absent.

Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

4 files changed, 88 insertions, 0 deletions

diff --git a/Documentation/userspace-api/media/drivers/index.rst b/Documentation/userspace-api/media/drivers/index.rst
index d706cb47b112..02967c9b18d6 100644
--- a/Documentation/userspace-api/media/drivers/index.rst
+++ b/Documentation/userspace-api/media/drivers/index.rst
@@ -32,6 +32,7 @@ For more details see the file COPYING in the source distribution of Linux.
 	cx2341x-uapi
 	dw100
 	imx-uapi
+	mali-c55
 	max2175
 	npcm-video
 	omap3isp-uapi
diff --git a/Documentation/userspace-api/media/drivers/mali-c55.rst b/Documentation/userspace-api/media/drivers/mali-c55.rst
new file mode 100644
index 000000000000..21148b187856
--- /dev/null
+++ b/Documentation/userspace-api/media/drivers/mali-c55.rst
@@ -0,0 +1,55 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+Arm Mali-C55 ISP driver
+=======================
+
+The Arm Mali-C55 ISP driver implements a single driver-specific control:
+
+``V4L2_CID_MALI_C55_CAPABILITIES (bitmask)``
+    Detail the capabilities of the ISP by giving detail about the fitted blocks.
+
+    .. flat-table:: Bitmask meaning definitions
+	:header-rows: 1
+	:widths: 2 4 8
+
+	* - Bit
+	  - Macro
+	  - Meaning
+        * - 0
+          - MALI_C55_PONG
+          - Pong configuration space is fitted in the ISP
+        * - 1
+          - MALI_C55_WDR
+          - WDR Framestitch, offset and gain is fitted in the ISP
+        * - 2
+          - MALI_C55_COMPRESSION
+          - Temper compression is fitted in the ISP
+        * - 3
+          - MALI_C55_TEMPER
+          - Temper is fitted in the ISP
+        * - 4
+          - MALI_C55_SINTER_LITE
+          - Sinter Lite is fitted in the ISP instead of the full Sinter version
+        * - 5
+          - MALI_C55_SINTER
+          - Sinter is fitted in the ISP
+        * - 6
+          - MALI_C55_IRIDIX_LTM
+          - Iridix local tone mappine is fitted in the ISP
+        * - 7
+          - MALI_C55_IRIDIX_GTM
+          - Iridix global tone mapping is fitted in the ISP
+        * - 8
+          - MALI_C55_CNR
+          - Colour noise reduction is fitted in the ISP
+        * - 9
+          - MALI_C55_FRSCALER
+          - The full resolution pipe scaler is fitted in the ISP
+        * - 10
+          - MALI_C55_DS_PIPE
+          - The downscale pipe is fitted in the ISP
+
+    The Mali-C55 ISP can be configured in a number of ways to include or exclude
+    blocks which may not be necessary. This control provides a way for the
+    driver to communicate to userspace which of the blocks are fitted in the
+    design.
\ No newline at end of file
diff --git a/include/uapi/linux/media/arm/mali-c55-config.h b/include/uapi/linux/media/arm/mali-c55-config.h
new file mode 100644
index 000000000000..7fddece54ada
--- /dev/null
+++ b/include/uapi/linux/media/arm/mali-c55-config.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * ARM Mali-C55 ISP Driver - Userspace API
+ *
+ * Copyright (C) 2023 Ideas on Board Oy
+ */
+
+#ifndef __UAPI_MALI_C55_CONFIG_H
+#define __UAPI_MALI_C55_CONFIG_H
+
+#include <linux/v4l2-controls.h>
+
+#define V4L2_CID_MALI_C55_CAPABILITIES	(V4L2_CID_USER_MALI_C55_BASE + 0x0)
+#define MALI_C55_GPS_PONG		(1U << 0)
+#define MALI_C55_GPS_WDR		(1U << 1)
+#define MALI_C55_GPS_COMPRESSION	(1U << 2)
+#define MALI_C55_GPS_TEMPER		(1U << 3)
+#define MALI_C55_GPS_SINTER_LITE	(1U << 4)
+#define MALI_C55_GPS_SINTER		(1U << 5)
+#define MALI_C55_GPS_IRIDIX_LTM		(1U << 6)
+#define MALI_C55_GPS_IRIDIX_GTM		(1U << 7)
+#define MALI_C55_GPS_CNR		(1U << 8)
+#define MALI_C55_GPS_FRSCALER		(1U << 9)
+#define MALI_C55_GPS_DS_PIPE		(1U << 10)
+
+#endif /* __UAPI_MALI_C55_CONFIG_H */
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 2d30107e047e..f84ed133a6c9 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -228,6 +228,12 @@ enum v4l2_colorfx {
  */
 #define V4L2_CID_USER_RKISP1_BASE		(V4L2_CID_USER_BASE + 0x1220)
 
+/*
+ * The base for the Arm Mali-C55 ISP driver controls.
+ * We reserve 16 controls for this driver
+ */
+#define V4L2_CID_USER_MALI_C55_BASE		(V4L2_CID_USER_BASE + 0x1230)
+
 /* MPEG-class control IDs */
 /* The MPEG controls are applicable to all codec controls
  * and the 'MPEG' part of the define is historical */