Linux mainlining effort

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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.

Contents

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.[1][2]

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.

Model A10 A10s A13

R8

A20 A23 A31 A33

R16

A64 A80 A83T GR8 H3 H5 H6 R40 V3s
AC97 NO N/A N/A NO N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A NO N/A
Audio Codec 4.4 4.4 4.4 4.4 4.10 4.10 4.11 4.21 N/A N/A 4.9 4.10 4.12 NO NO 4.13
ADC GPADC 4.12 4.12 4.12 4.12 N/A WIP N/A N/A NO N/A 4.12 N/A N/A N/A NO N/A
Thermal 3.16 3.14 3.14 3.16  ? WIP 4.12 WIP WIP WIP 4.9 WIP WIP WIP NO N/A
Touch 3.16 3.14 3.14 3.16 N/A WIP N/A N/A NO N/A 4.9 N/A N/A N/A NO N/A
Camera BT656 WIP WIP WIP WIP  ? 4.21  ?  ?  ? WIP WIP 4.21 4.21  ?  ? 4.21
ISP NO N/A N/A NO N/A NO N/A N/A NO NO N/A N/A N/A N/A N/A NO
MIPI-CSI N/A N/A N/A N/A N/A NO N/A N/A NO NO N/A N/A N/A N/A N/A NO
Parallel WIP WIP WIP WIP  ? 4.21  ?  ?  ? WIP WIP 4.21 4.21  ?  ? 4.21
Clocks 3.10 3.11 3.10 3.12 3.17 3.12 4.2 4.10 3.19 4.13 4.9 4.8 4.12 4.17 4.14 4.11
CPUFreq 4.0 4.0 4.0 4.0 NO 4.2 4.11 NO NO 4.17 NO 4.18 4.18 NO NO NO
Crypto 4.3 4.13 4.13 4.3  ? 4.3 4.3 WIP WIP WIP 4.13 WIP WIP WIP WIP  ?
Display (SimpleFB) 3.19 3.19 4.0 3.19 3.19 3.19 3.19 4.17 NO NO 4.9 4.16 4.16 NO NO NO
Display

(DRM)

CVBS NO 4.9 ? 4.7 NO N/A N/A N/A N/A N/A N/A 4.9 NO NO NO NO N/A
HDMI Audio NO NO N/A NO N/A NO N/A NO NO NO N/A NO NO NO NO N/A
HDMI CEC 4.15 4.14 N/A 4.15 N/A 4.15 N/A 4.20 NO 4.17 N/A 4.17 4.17 NO WIP N/A
HDMI Video 4.15 4.13 N/A 4.15 N/A 4.15 N/A 4.20 NO 4.17 N/A 4.17 4.17 4.21 4.19 N/A
LVDS  ? N/A N/A  ?  ?  ?  ?  ?  ? 4.16 N/A N/A N/A N/A  ? N/A
MIPI DSI N/A N/A N/A N/A  ? NO 4.18 WIP NO NO N/A N/A N/A N/A NO N/A
RGB 4.15  ? 4.7 4.15  ? 4.10 4.9 NO WIP 4.16 4.9 N/A N/A NO NO 4.13
VGA NO N/A N/A NO N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A NO N/A
DMA 4.3 4.3 4.3 4.3 3.18 3.17 4.2 4.15  ? 4.9 4.9 4.2 4.12  ? NO 4.13
Ethernet EMAC 3.11 3.11 N/A 3.11 N/A N/A N/A 4.15 NO 4.16 N/A 4.15 4.15 4.21 4.18 4.13
GMAC N/A N/A 3.15 3.17
HW Spinlocks N/A N/A N/A N/A N/A N/A N/A NO NO NO N/A NO NO NO N/A N/A
I2C 3.11 3.12 3.11 3.13 3.18 3.15 4.2 4.10 3.19 4.16 4.9 4.9 4.12 NO 4.15 4.11
I2S 4.8  ? N/A 4.8  ? 4.13 4.11 4.17 NO 4.16 4.9 4.14 NO NO NO N/A
IOMMU N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A NO N/A N/A
IR 3.17 4.0 4.0 3.17 N/A 4.0 N/A  ? 4.5 4.20 4.9 4.6 4.12 NO  ? N/A
Keypad WIP N/A N/A WIP N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A NO N/A
LRADC 4.0 4.0 4.0 4.0 4.0 4.0 4.2  ?  ?  ? 4.9  ?  ? N/A  ? 4.13
MsgBox N/A N/A N/A N/A N/A N/A N/A NO NO NO N/A NO NO NO N/A N/A
NAND  ?  ? 4.12 [3]  ? 4.9 [3]  ? 4.9 [3]  ?  ?  ? 4.9 [3]  ?  ? NO  ? N/A
PCIe N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A NO [4] N/A N/A
Pinctrl 3.9 3.9 3.9 3.12 3.18 3.12 4.2 4.6 3.19 4.4 4.9 4.5 4.12 4.17 4.14 4.11
PWM 4.0 4.4 4.4 4.0 4.4 WIP 4.4 4.19 NO 4.16 4.9 4.9 4.12  ? WIP  ?
RSB N/A N/A N/A N/A 4.4 N/A 4.4 4.13 4.3 4.14 N/A  ?  ?  ? N/A N/A
RTC 3.14 N/A N/A 3.14 3.18 3.18 4.2 4.10 N/A N/A N/A 4.5 4.12  ?  ? 4.11
SATA 3.15 N/A N/A 3.15 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 4.20 N/A
SD/ MMC 3.16 3.16 3.16 3.16 3.18 3.16 4.2 4.11 4.0 4.14 4.9 4.5 4.12 4.19 4.14 4.11
SMP N/A N/A N/A PSCI PSCI PSCI PSCI PSCI 4.17 4.18 N/A PSCI PSCI NO PSCI N/A
SPDIF 4.7 N/A N/A 4.7 N/A 4.9 N/A 4.17  ? 4.13 4.9 4.11 4.12 NO  ? N/A
SPI 3.16 3.15 3.15 3.15  ? 3.15  ? 4.15  ?  ? 4.9 4.10 4.12 NO  ? 4.13
SRAM 4.2 4.2 4.2 4.2 4.19 NO 4.19 4.19 N/A N/A 4.2 4.19  ? N/A NO N/A
USB 3.15 3.15 3.15 3.15 4.3 3.16 4.3 4.11 4.2 4.14 4.9 4.8 4.12 WIP 4.15 4.11
USB OTG 4.3 4.3 4.3 4.3 4.8 4.3 4.8 4.11 NO 4.15 4.9 4.12 4.12 WIP NO 4.11
USB3 N/A N/A N/A N/A N/A N/A N/A N/A NO N/A N/A N/A N/A WIP N/A N/A
VE | Sunxi-Cedrus  ?  ? 4.20 4.20  ?  ? 4.20 4.21 NO NO  ? 4.20 4.21 NO NO NO
Watchdog 3.12 3.12 3.12 3.12 3.18 3.18 4.2 4.17 3.19 4.6 4.9 4.5 4.12  ?  ? 4.11
Model A10 A10s A13

R8

A20 A23 A31 A33

R16

A64 A80 A83T GR8 H3 H5 H6 R40 V3s


Legend
In Linux mainline since version x
Nobody works on it, but it should be compatible with already done drivers
Somebody works on it
No support, nobody works on it
support impossible
Status is unknown/to be completed

Work In Progress

Core Stuff

  • Message box (WiP: Samuel Holland) patch
  • A13 PSCI Suspend / Resume / CPUIdle (WiP: Antoine Tenart) patch-v1

Major drivers

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

Minor drivers

Planned for 5.0

  • A64
    • Cedrus
  • 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

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

New Devices

Changes merged up to 4.18

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

References

  1. http://www.elinux.org/images/a/ad/Arm-soc-checklist.pdf
  2. Your New ARM SoC Linux Support Check-List – ELCE 2012
  3. 3.0 3.1 3.2 3.3 While the NAND controller itself is supported, the NAND technology found on the vast majority of boards isn't. See this page
  4. Allwinner H6 has a quirky PCIe controller that doesn't map the PCIe address space properly to CPU, and accessing the PCIe config space, IO space or memory space will need to be wrapped. As Linux doesn't wrap PCIe memory space access, it's not possible to do a proper PCIe controller driver for H6. The BSP kernel modifies the driver to wrap the access, so it's also not generic, and only devices with modified driver will work.

See also

External Links

How to upstream

Notes

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