Linux mainlining effort

The purpose of this page is to try and define sub-goals and milestones for the mainlining effort, containing goals and sub-goals with milestones for adding Allwinner support in the upstream mainline Linux Kernel.

=Overview= The idea is to submit the code needed to run the Linux kernel on Allwinner SoCs upstream, ie. to the official Linux kernel.

This can be achieved by following the concept outlined in the Your new ARM SoC Linux support check-list! article published by Thomas Petazzoni from Bootlin.

Where relevant, I have attempted to include who is currently working on an item, mostly separate from any particular mainlining goal.

=Status=

The Mainline Kernel howto contains the currently used repositories for the mainlining process. The U-Boot repository and toolchain is described in the Mainline U-Boot howto.

The Mainline Kernel category  gives an overview of currently supported devices.

Status Matrix
The goal of this matrix is to give an easy view of work on each SoC worked on by linux-sunxi.

Core Stuff

 * Message box (WiP: Samuel Holland) patch


 * A13 PSCI Suspend / Resume / CPUIdle (WiP: Antoine Tenart) patch-v1

Major drivers

 * A64
 * MIPI-DSI (WiP: Jagan Teki) drm/sun4i: Allwinner A64 MIPI-DSI support
 * H6
 * USB 2.0/3.0 support (WiP: Icenowy Zheng (icenowy)) patch-v3


 * Audio codec support:
 * A20 Audio Codec improvements (WiP: Danny Milosavljevic) patch-v9
 * AC100 Audio codec support (WiP: Ondrej Jirman (megi)) WIP branch


 * CSI (camera sensor interface)
 * A64 CSI support (WiP: Jagan Teki media/sun6i: Allwinner A64 CSI support)
 * A10 CSI support (WiP: Maxime Ripard media: Allwinner A10 CSI support)
 * RGB565 format support for sun6i-csi (WiP: Chen-Yu Tsai (wens))


 * Security System/Crypto Engine
 * sun8i-ss/sun9i-ss/sun5i-ss (WIP: LABBE Corentin more info at http://sunxi.montjoie.ovh/)


 * Video Engine
 * H.264 decoding support (WiP: Maxime Ripard (mripard)) patch-v2


 * ARM Mali400
 * Lima DRM driver patch RFC (WiP: Qiang Yu (yuq)), mesa-lima (open source) (WiP: Qiang Yu (yuq))

Minor drivers

 * Broadcom-based (AMPAK modules) Bluetooth support on various boards (WiP: Chen-Yu Tsai (wens) patch-v2
 * R40 PWM (WIP Hao Zhang patch-v2)
 * A31/A31s PWM support (WiP: Siarhei Volkau patch-v1)
 * A20 Keypad (WiP: Yassin Jaffer (ddc) patch)
 * A83T H3 H5 A80 A64 H6 Thermal driver (WIP: Philipp Rossak (embed-3d) v3-branch: patch v3: contains only a83t and h3)

Planned for 5.0

 * A64
 * Cedrus
 * DTS changes for audio codec


 * H6
 * Ethernet
 * DE3/HDMI support
 * USB 2.0


 * H3 / H5
 * CSI Support


 * H5
 * Cedrus


 * V3s
 * CSI Support

Merged into 4.20

 * A13
 * Cedrus driver


 * A20
 * Cedrus driver


 * A33
 * Cedrus driver


 * A83T
 * IR receiver


 * A64
 * Cleanup for device tree files
 * HDMI support
 * Audio codec support (DTS changes will be merged in 4.21)


 * H3
 * Cedrus driver
 * SID


 * H5
 * SID


 * R40
 * SATA

New Devices Supported
 * Pine64 LTS
 * Xunlong Orange Pi Zero Plus 2 (H3 variant)
 * Sinovoip Banana Pi M2+ (H5 variant)

Merged into 4.19

 * A10 / A13 / A20 / A23 / A33
 * SRAM controller / system control


 * A64
 * SRAM controller / system control
 * Display clocks and bus
 * RTC clock output
 * PWM
 * R_I2C


 * H3
 * SRAM controller / system control


 * H6
 * MMC
 * PMIC


 * R40
 * HDMI support

Board Changes
 * SPI flash node for Orange Pi PC 2 and Pine64 SoPINE
 * Use lid switch as wake-up source for A64 based laptops
 * LEDs added for PineH64

New Devices
 * Pine Pinebook
 * Amarula A64-Relic

Changes merged up to 4.18
Changes up to 4.18 can be found on Linux mainlining history page.

=References=

= See also =
 * Mainline Kernel Howto
 * Possible setups for hacking on mainline
 * Linux Kernel
 * Toolchain

=External Links=
 * kernel.org - Official website for the Linux Kernel
 * http://github.com/torvalds/linux - Linus Torvalds' GitHub account with the upstream Linux kernel
 * Linux Kernel documentation index
 * Linux Kernel man pages
 * Kernel Newbies Site - Excellent source of information for people new to kernel
 * Linus' kernel tree for 2.6
 * Kernel bugzilla - Regressions for each of recent versions
 * Linux-libre project - Maintains and distributes fully free kernel
 * LinGrok, Linux kernel source code cross-reference
 * Bootlin LXR (Linux Cross Reference)
 * linux-arm-kernel - Mailing list archive

How to upstream

 * Your new ARM SoC Linux support check-list! by Thomas Petazzoni of Bootlin
 * Linux Kernel Upstreaming How-To (CNXSoft - Embedded Software Development)
 * Matt Porter's YouTube video talk on “Upstreaming 101" (LCA14-111)
 * Matt Porter's presentation slides for “Upstreaming 101" (LCA14-111)
 * Matt Porter's YouTube video talk on “Upstreaming 201" (LCA14-112)
 * Matt Porter's presentation slides for “Upstreaming 201" (LCA14-112)
 * How to Write and Submit a Linux Kernel Patch (CNXSoft - Embedded Software Development)
 * YouTube Video- Write and Submit your first Linux kernel Patch
 * Greg Kroah-­Hartman Kernel Tutorial Write and Submit your first Linux Kernel Patch
 * Linaro resources page from LCA (Linaro Connect Asia) 2014

=Notes=