From f4cdf7ca9a1fdcca413157df19753f388a5a224e Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Wed, 19 Aug 2026 10:09:22 -0700 Subject: Merge tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media Pull media updates from Mauro Carvalho Chehab: - v4l2-core: added ISP statistics support and per-block validation - v4l2-core: Allow unknown HDR10 white point and luminance - New camera sensors: Sony IMX678 and IMX471m, Himax HM1092 IR sensor - New codec: Milos: VPU v2.0 codec support - isp driver: gained support for Dreamchip RPPX1 ISP framework - vsp1 driver: gained support for RZ/T2H and RZ/N2H - Novalake driver: gained CVS support for new NVL hardware - dvb-core: fix feed leak on failed DMX_ADD_PID - several driver fixes, cleanups and minor improvements * tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (308 commits) media: ipu-bridge: check all DMI entries when overriding sensor rotation media: v4l2-async: avoid deleting unlinked ASC entry on link error media: rzg2l-cru: Align bytesperline to hardware DMA stride requirement media: intel/ipu6: fix async notifier cleanup leak on parse error media: staging/ipu7: fix async notifier UAF on probe error path media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem() media: rcar-isp: Fix VSPX reference leaks media: rcar-isp: Release ISPCORE resources media: i2c: imx415: Release runtime PM reference on VBLANK error media: i2c: imx415: Return test pattern write errors media: renesas: vsp1: Declare index variables in for loop statement media: renesas: vsp1: Make reset control optional to support platforms without a reset line media: dt-bindings: media: renesas,vsp1: Document RZ/T2H and RZ/N2H SoCs media: dt-bindings: media: renesas,fcp: Document RZ/T2H and RZ/N2H SoCs media: nxp: imx8-isi: Add additional 32-bit RGB format support media: nxp: imx8-isi: Add 16-bit raw Bayer format support media: nxp: imx8-isi: Implement per-stream reference counting for multiplexed streams media: nxp: imx8-isi: Use BIT_ULL() for 64-bit stream masks media: nxp: imx8-isi: Correct color map between V4L2 and ISI ... --- Documentation/doc-guide/parse-headers.rst | 187 ++++++++++++++++++++++++++++++ 1 file changed, 187 insertions(+) create mode 100644 Documentation/doc-guide/parse-headers.rst (limited to 'Documentation/doc-guide/parse-headers.rst') diff --git a/Documentation/doc-guide/parse-headers.rst b/Documentation/doc-guide/parse-headers.rst new file mode 100644 index 000000000..a7bb01ff0 --- /dev/null +++ b/Documentation/doc-guide/parse-headers.rst @@ -0,0 +1,187 @@ +=========================== +Including uAPI header files +=========================== + +Sometimes, it is useful to include header files and C example codes in +order to describe the userspace API and to generate cross-references +between the code and the documentation. Adding cross-references for +userspace API files has an additional advantage: Sphinx will generate warnings +if a symbol is not found at the documentation. That helps to keep the +uAPI documentation in sync with the Kernel changes. +The :ref:`parse_headers.py ` provides a way to generate such +cross-references. It has to be called via Makefile, while building the +documentation. Please see ``Documentation/userspace-api/media/Makefile`` for an example +about how to use it inside the Kernel tree. + +.. _parse_headers: + +tools/docs/parse_headers.py +^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +NAME +**** + +parse_headers.py - parse a C file, in order to identify functions, structs, +enums and defines and create cross-references to a Sphinx book. + +USAGE +***** + +parse-headers.py [-h] [-d] [-t] ``FILE_IN`` ``FILE_OUT`` ``FILE_RULES`` + +SYNOPSIS +******** + +Converts a C header or source file ``FILE_IN`` into a ReStructured Text +included via ..parsed-literal block with cross-references for the +documentation files that describe the API. It accepts an optional +``FILE_RULES`` file to describe what elements will be either ignored or +be pointed to a non-default reference type/name. + +The output is written at ``FILE_OUT``. + +It is capable of identifying ``define``, ``struct``, ``typedef``, ``enum`` +and enum ``symbol``, creating cross-references for all of them. + +It is also capable of distinguishing ``#define`` used for specifying +Linux-specific macros used to define ``ioctl``. + +The optional ``FILE_RULES`` contains a set of rules like:: + + ignore ioctl VIDIOC_ENUM_FMT + replace ioctl VIDIOC_DQBUF vidioc_qbuf + replace define V4L2_EVENT_MD_FL_HAVE_FRAME_SEQ :c:type:`v4l2_event_motion_det` + +POSITIONAL ARGUMENTS +******************** + + ``FILE_IN`` + Input C file + + ``FILE_OUT`` + Output RST file + + ``FILE_RULES`` + Exceptions file (optional) + +OPTIONS +******* + + ``-h``, ``--help`` + show a help message and exit + ``-d``, ``--debug`` + Increase debug level. Can be used multiple times + ``-t``, ``--toc`` + instead of a literal block, outputs a TOC table at the RST file + + +DESCRIPTION +*********** + +Creates an enriched version of a Kernel header file with cross-links +to each C data structure type, from ``FILE_IN``, formatting it with +reStructuredText notation, either as-is or as a table of contents. + +It accepts an optional ``FILE_RULES`` which describes what elements will be +either ignored or be pointed to a non-default reference, and optionally +defines the C namespace to be used. + +It is meant to allow having more comprehensive documentation, where +uAPI headers will create cross-reference links to the code. + +The output is written at the ``FILE_OUT``. + +The ``FILE_RULES`` may contain contain three types of statements: +**ignore**, **replace** and **namespace**. + +By default, it create rules for all symbols and defines, but it also +allows parsing an exception file. Such file contains a set of rules +using the syntax below: + +1. Ignore rules: + + ignore *type* *symbol* + +Removes the symbol from reference generation. + +2. Replace rules: + + replace *type* *old_symbol* *new_reference* + + Replaces *old_symbol* with a *new_reference*. + The *new_reference* can be: + + - A simple symbol name; + - A full Sphinx reference. + +3. Namespace rules + + namespace *namespace* + + Sets C *namespace* to be used during cross-reference generation. Can + be overridden by replace rules. + +On ignore and replace rules, *type* can be: + + - ioctl: + for defines of the form ``_IO*``, e.g., ioctl definitions + + - define: + for other defines + + - symbol: + for symbols defined within enums; + + - typedef: + for typedefs; + + - enum: + for the name of a non-anonymous enum; + + - struct: + for structs. + + +EXAMPLES +******** + +- Ignore a define ``_VIDEODEV2_H`` at ``FILE_IN``:: + + ignore define _VIDEODEV2_H + +- On an data structure like this enum:: + + enum foo { BAR1, BAR2, PRIVATE }; + + It won't generate cross-references for ``PRIVATE``:: + + ignore symbol PRIVATE + + At the same struct, instead of creating one cross reference per symbol, + make them all point to the ``enum foo`` C type:: + + replace symbol BAR1 :c:type:\`foo\` + replace symbol BAR2 :c:type:\`foo\` + + +- Use C namespace ``MC`` for all symbols at ``FILE_IN``:: + + namespace MC + +BUGS +**** + + +Report bugs to Mauro Carvalho Chehab + + +COPYRIGHT +********* + + +Copyright (c) 2016, 2025 by Mauro Carvalho Chehab . + +License GPLv2: GNU GPL version 2 . + +This is free software: you are free to change and redistribute it. +There is NO WARRANTY, to the extent permitted by law. -- cgit v1.3.1