Convert the document to rst and add it to the v4l-drivers book. Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx> --- Documentation/media/v4l-drivers/fimc.rst | 95 +++++++++++++++++++------------ Documentation/media/v4l-drivers/index.rst | 1 + 2 files changed, 60 insertions(+), 36 deletions(-) diff --git a/Documentation/media/v4l-drivers/fimc.rst b/Documentation/media/v4l-drivers/fimc.rst index 4fab231be52e..d9f950d90eb5 100644 --- a/Documentation/media/v4l-drivers/fimc.rst +++ b/Documentation/media/v4l-drivers/fimc.rst @@ -1,7 +1,9 @@ -Samsung S5P/EXYNOS4 FIMC driver +.. include:: <isonum.txt> -Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd. ---------------------------------------------------------------------------- +The Samsung S5P/EXYNOS4 FIMC driver +=================================== + +Copyright |copy| 2012 - 2013 Samsung Electronics Co., Ltd. The FIMC (Fully Interactive Mobile Camera) device available in Samsung SoC Application Processors is an integrated camera host interface, color @@ -12,50 +14,53 @@ slightly different capabilities, like pixel alignment constraints, rotator availability, LCD writeback support, etc. The driver is located at drivers/media/platform/exynos4-is directory. -1. Supported SoCs -================= +Supported SoCs +-------------- S5PC100 (mem-to-mem only), S5PV210, EXYNOS4210 -2. Supported features -===================== +Supported features +------------------ - - camera parallel interface capture (ITU-R.BT601/565); - - camera serial interface capture (MIPI-CSI2); - - memory-to-memory processing (color space conversion, scaling, mirror - and rotation); - - dynamic pipeline re-configuration at runtime (re-attachment of any FIMC - instance to any parallel video input or any MIPI-CSI front-end); - - runtime PM and system wide suspend/resume +- camera parallel interface capture (ITU-R.BT601/565); +- camera serial interface capture (MIPI-CSI2); +- memory-to-memory processing (color space conversion, scaling, mirror + and rotation); +- dynamic pipeline re-configuration at runtime (re-attachment of any FIMC + instance to any parallel video input or any MIPI-CSI front-end); +- runtime PM and system wide suspend/resume -Not currently supported: - - LCD writeback input - - per frame clock gating (mem-to-mem) +Not currently supported +----------------------- -3. Files partitioning -===================== +- LCD writeback input +- per frame clock gating (mem-to-mem) + +Files partitioning +------------------ - media device driver drivers/media/platform/exynos4-is/media-dev.[ch] - - camera capture video device driver +- camera capture video device driver drivers/media/platform/exynos4-is/fimc-capture.c - - MIPI-CSI2 receiver subdev +- MIPI-CSI2 receiver subdev drivers/media/platform/exynos4-is/mipi-csis.[ch] - - video post-processor (mem-to-mem) +- video post-processor (mem-to-mem) drivers/media/platform/exynos4-is/fimc-core.c - - common files +- common files drivers/media/platform/exynos4-is/fimc-core.h drivers/media/platform/exynos4-is/fimc-reg.h drivers/media/platform/exynos4-is/regs-fimc.h -4. User space interfaces -======================== +User space interfaces +--------------------- -4.1. Media device interface +Media device interface +~~~~~~~~~~~~~~~~~~~~~~ The driver supports Media Controller API as defined at https://linuxtv.org/downloads/v4l-dvb-apis/media_common.html @@ -72,7 +77,8 @@ Reconfiguration is done by enabling/disabling media links created by the driver during initialization. The internal device topology can be easily discovered through media entity and links enumeration. -4.2. Memory-to-memory video node +Memory-to-memory video node +~~~~~~~~~~~~~~~~~~~~~~~~~~~ V4L2 memory-to-memory interface at /dev/video? device node. This is standalone video device, it has no media pads. However please note the mem-to-mem and @@ -80,7 +86,8 @@ capture video node operation on same FIMC instance is not allowed. The driver detects such cases but the applications should prevent them to avoid an undefined behaviour. -4.3. Capture video node +Capture video node +~~~~~~~~~~~~~~~~~~ The driver supports V4L2 Video Capture Interface as defined at: https://linuxtv.org/downloads/v4l-dvb-apis/devices.html @@ -89,13 +96,15 @@ At the capture and mem-to-mem video nodes only the multi-planar API is supported. For more details see: https://linuxtv.org/downloads/v4l-dvb-apis/planar-apis.html -4.4. Camera capture subdevs +Camera capture subdevs +~~~~~~~~~~~~~~~~~~~~~~ Each FIMC instance exports a sub-device node (/dev/v4l-subdev?), a sub-device node is also created per each available and enabled at the platform level MIPI-CSI receiver device (currently up to two). -4.5. sysfs +sysfs +~~~~~ In order to enable more precise camera pipeline control through the sub-device API the driver creates a sysfs entry associated with "s5p-fimc-md" platform @@ -115,15 +124,22 @@ when the last configuration steps at the video node is performed. For full sub-device control support (subdevs configured at user space before starting streaming): -# echo "sub-dev" > /sys/platform/devices/s5p-fimc-md/subdev_conf_mode + +.. code-block:: none + + # echo "sub-dev" > /sys/platform/devices/s5p-fimc-md/subdev_conf_mode For V4L2 video node control only (subdevs configured internally by the host driver): -# echo "vid-dev" > /sys/platform/devices/s5p-fimc-md/subdev_conf_mode + +.. code-block:: none + + # echo "vid-dev" > /sys/platform/devices/s5p-fimc-md/subdev_conf_mode + This is a default option. 5. Device mapping to video and subdev device nodes -================================================== +-------------------------------------------------- There are associated two video device nodes with each device instance in hardware - video capture and mem-to-mem and additionally a subdev node for @@ -134,14 +150,21 @@ How to find out which /dev/video? or /dev/v4l-subdev? is assigned to which device? You can either grep through the kernel log to find relevant information, i.e. -# dmesg | grep -i fimc + +.. code-block:: none + + # dmesg | grep -i fimc + (note that udev, if present, might still have rearranged the video nodes), or retrieve the information from /dev/media? with help of the media-ctl tool: -# media-ctl -p + +.. code-block:: none + + # media-ctl -p 7. Build -======== +-------- If the driver is built as a loadable kernel module (CONFIG_VIDEO_SAMSUNG_S5P_FIMC=m) two modules are created (in addition to the core v4l2 modules): s5p-fimc.ko and diff --git a/Documentation/media/v4l-drivers/index.rst b/Documentation/media/v4l-drivers/index.rst index 1ab7a84de0ff..333f84b9c17e 100644 --- a/Documentation/media/v4l-drivers/index.rst +++ b/Documentation/media/v4l-drivers/index.rst @@ -25,4 +25,5 @@ License". cx18 cx88 davinci-vpbe + fimc zr364xx -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
