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Message-Id: <20250810220921.14307-5-will@willwhang.com> Date: Sun, 10 Aug 2025 23:09:21 +0100 From: Will Whang <will@...lwhang.com> To: Will Whang <will@...lwhang.com>, Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, Sakari Ailus <sakari.ailus@...ux.intel.com> Cc: linux-media@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org Subject: [PATCH v2 4/4] media: docs: Add userspace-API guide for the IMX585 driver The new IMX585 V4L2 sub-device driver introduces several driver-specific controls for configuring Clear-HDR blending, gradation compression thresholds, and HCG enabling. This patch adds an rst document under Documentation/userspace-api/media/drivers/ that details each control, allowed values, and their effects. Signed-off-by: Will Whang <will@...lwhang.com> --- .../userspace-api/media/drivers/imx585.rst | 122 ++++++++++++++++++ .../userspace-api/media/drivers/index.rst | 1 + MAINTAINERS | 1 + 3 files changed, 124 insertions(+) create mode 100644 Documentation/userspace-api/media/drivers/imx585.rst diff --git a/Documentation/userspace-api/media/drivers/imx585.rst b/Documentation/userspace-api/media/drivers/imx585.rst new file mode 100644 index 000000000..9f7c16f30 --- /dev/null +++ b/Documentation/userspace-api/media/drivers/imx585.rst @@ -0,0 +1,122 @@ +.. SPDX-License-Identifier: GPL-2.0-only + +Sony IMX585 driver +================== + +The IMX585 image-sensor driver provides the following *driver-specific* +V4L2 controls. They are visible only when the IMX585 driver is loaded +and sit in the sensor-private control class. + +HDR data blending +----------------- + +``V4L2_CID_IMX585_HDR_DATASEL_TH`` (``U16[2]``) + Lower/upper **thresholds** (0 – 4095) that decide which exposure is + chosen—or blended—for each pixel in Clear-HDR mode. + +``V4L2_CID_IMX585_HDR_DATASEL_BK`` (menu) + **Blending ratio** between the long-gain (LG) and + high-gain (HG) read-outs. + + .. flat-table:: + :stub-columns: 0 + :widths: 1 5 + + * - ``0`` + - HG ½, LG ½ + * - ``1`` + - HG ¾, LG ¼ + * - ``2`` # duplicate ratio present in the datasheet + - HG ½, LG ½ + * - ``3`` + - HG ⅞, LG ⅛ + * - ``4`` + - HG 15⁄16, LG 1⁄16 + * - ``5`` # second 50/50 entry as documented + - **2ⁿᵈ** HG ½, LG ½ + * - ``6`` + - HG 1⁄16, LG 15⁄16 + * - ``7`` + - HG ⅛, LG ⅞ + * - ``8`` + - HG ¼, LG ¾ + +Gradation compression +--------------------- + +``V4L2_CID_IMX585_HDR_GRAD_TH`` (``U32[2]``) + 17-bit **break-points** (0 – 0x1ffff) that shape the 16-bit + gradation-compression curve. + +``V4L2_CID_IMX585_HDR_GRAD_COMP_L`` (menu) + See V4L2_CID_IMX585_HDR_GRAD_COMP_H + +``V4L2_CID_IMX585_HDR_GRAD_COMP_H`` (menu) + **Compression ratios** below the first break-point and between the + two break-points, respectively. + + .. flat-table:: + :stub-columns: 0 + :widths: 1 4 + + * - ``0`` + - 1 : 1 + * - ``1`` + - 1 : 2 + * - ``2`` + - 1 : 4 *(default for COMP_L)* + * - ``3`` + - 1 : 8 + * - ``4`` + - 1 : 16 + * - ``5`` + - 1 : 32 + * - ``6`` + - 1 : 64 *(default for COMP_H)* + * - ``7`` + - 1 : 128 + * - ``8`` + - 1 : 256 + * - ``9`` + - 1 : 512 + * - ``10`` + - 1 : 1024 + * - ``11`` + - 1 : 2048 + +Gain settings +------------- + +``V4L2_CID_IMX585_HDR_GAIN`` (menu) + **Additional gain** (in dB) applied to the high-gain path when + Clear-HDR is active. + + .. flat-table:: + :stub-columns: 0 + :widths: 1 3 + + * - ``0`` + - +0 dB + * - ``1`` + - +6 dB + * - ``2`` + - +12 dB *(default)* + * - ``3`` + - +18 dB + * - ``4`` + - +24 dB + * - ``5`` + - +29.1 dB + +``V4L2_CID_IMX585_HCG_GAIN`` (boolean) + Toggle **High-Conversion-Gain** mode. + + *0 = LCG (default), 1 = HCG.* + +Notes +----- + +* Controls are writable while streaming; changes take effect from the + next frame. +* HDR-specific controls are hidden when HDR is disabled. +* Inter-control dependencies are enforced by the driver. diff --git a/Documentation/userspace-api/media/drivers/index.rst b/Documentation/userspace-api/media/drivers/index.rst index d706cb47b..87912acfb 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 + imx585 max2175 npcm-video omap3isp-uapi diff --git a/MAINTAINERS b/MAINTAINERS index 175f5236a..42e32b6ba 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -23183,6 +23183,7 @@ M: Will Whang <will@...lwhang.com> L: linux-media@...r.kernel.org S: Maintained F: Documentation/devicetree/bindings/media/i2c/sony,imx585.yaml +F: Documentation/userspace-api/media/drivers/imx585.rst F: drivers/media/i2c/imx585.c F: include/uapi/linux/imx585.h -- 2.39.5
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