[PATCH v10 06/17] media: uapi: Add controls for Mali-C55 ISP

Daniel Scally
2025-06-24T10:21:44Z

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.

Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
---
Changes in v10:

- None

Changes in v9:

- New patch
---
.../userspace-api/media/drivers/index.rst | 1 +
.../userspace-api/media/drivers/mali-c55.rst | 55 ++++++++++++++++++++++
include/uapi/linux/media/arm/mali-c55-config.h | 26 ++++++++++
include/uapi/linux/v4l2-controls.h | 6 +++
4 files changed, 88 insertions(+)

diff --git a/Documentation/userspace-api/media/drivers/index.rst b/Documentation/userspace-api/media/drivers/index.rst
index d706cb47b1122b6e145a02ab826eb3ecc7997c2b..02967c9b18d6e90f414ccc1329c09bffee895e68 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 0000000000000000000000000000000000000000..e8519da77d737b91a931bbe47920af707eebf110
--- /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``
+ 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_GPS_PONG_FITTED
+ - Pong configuration space is fitted in the ISP
+ * - 1
+ - MALI_C55_GPS_WDR_FITTED
+ - WDR Framestitch, offset and gain is fitted in the ISP
+ * - 2
+ - MALI_C55_GPS_COMPRESSION_FITTED
+ - Temper compression is fitted in the ISP
+ * - 3
+ - MALI_C55_GPS_TEMPER_FITTED
+ - Temper is fitted in the ISP
+ * - 4
+ - MALI_C55_GPS_SINTER_LITE_FITTED
+ - Sinter Lite is fitted in the ISP instead of the full Sinter version
+ * - 5
+ - MALI_C55_GPS_SINTER_FITTED
+ - Sinter is fitted in the ISP
+ * - 6
+ - MALI_C55_GPS_IRIDIX_LTM_FITTED
+ - Iridix local tone mappine is fitted in the ISP
+ * - 7
+ - MALI_C55_GPS_IRIDIX_GTM_FITTED
+ - Iridix global tone mapping is fitted in the ISP
+ * - 8
+ - MALI_C55_GPS_CNR_FITTED
+ - Colour noise reduction is fitted in the ISP
+ * - 9
+ - MALI_C55_GPS_FRSCALER_FITTED
+ - The full resolution pipe scaler is fitted in the ISP
+ * - 10
+ - MALI_C55_GPS_DS_PIPE_FITTED
+ - 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 0000000000000000000000000000000000000000..2bd60a0d78786be368c2e51b1a0a63fd2a5f690b
--- /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_FITTED BIT(0)
+#define MALI_C55_GPS_WDR_FITTED BIT(1)
+#define MALI_C55_GPS_COMPRESSION_FITTED BIT(2)
+#define MALI_C55_GPS_TEMPER_FITTED BIT(3)
+#define MALI_C55_GPS_SINTER_LITE_FITTED BIT(4)
+#define MALI_C55_GPS_SINTER_FITTED BIT(5)
+#define MALI_C55_GPS_IRIDIX_LTM_FITTED BIT(6)
+#define MALI_C55_GPS_IRIDIX_GTM_FITTED BIT(7)
+#define MALI_C55_GPS_CNR_FITTED BIT(8)
+#define MALI_C55_GPS_FRSCALER_FITTED BIT(9)
+#define MALI_C55_GPS_DS_PIPE_FITTED BIT(10)
+
+#endif /* __UAPI_MALI_C55_CONFIG_H */
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 72e32814ea83dee5f1202c1249eac7cf3b85a22a..a31105115410bd041a3ac492ce86becd93a62d87 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -222,6 +222,12 @@ enum v4l2_colorfx {
*/
#define V4L2_CID_USER_UVC_BASE (V4L2_CID_USER_BASE + 0x11e0)

+/*
+ * The base for the Arm Mali-C55 ISP driver controls.
+ * We reserve 8 controls for this driver
+ */
+#define V4L2_CID_USER_MALI_C55_BASE (V4L2_CID_USER_BASE + 0x1220)
+
/* MPEG-class control IDs */
/* The MPEG controls are applicable to all codec controls
* and the 'MPEG' part of the define is historical */

--
2.34.1