Linux 4.12, Free Electrons contributions

Linus Torvalds has released the 4.12 Linux kernel a week ago, in what is the second biggest kernel release ever by number of commits. As usual, LWN had a very nice coverage of the major new features and improvements: first part, second part and third part.

LWN has also published statistics about the Linux 4.12 development cycles, showing:

  • Free Electrons as the #14 contributing company by number of commits, with 221 commits, between Broadcom (230 commits) and NXP (212 commits)
  • Free Electrons as the #14 contributing company number of changed lines, with 16636 lines changed, just two lines less than Mellanox
  • Free Electrons engineer and MTD NAND maintainer Boris Brezillon as the #17 most active contributor by number of lines changed.

Our most important contributions to this kernel release have been:

  • On Atmel AT91 and SAMA5 platforms:
    • Alexandre Belloni has continued to upstream the support for the SAMA5D2 backup mode, which is a very deep suspend to RAM state, offering very nice power savings. Alexandre touched the core code in arch/arm/mach-at91 as well as pinctrl and irqchip drivers
    • Boris Brezillon has converted the Atmel PWM driver to the atomic API of the PWM subsystem, implemented suspend/resume and did a number of fixes in the Atmel display controller driver, and also removed the no longer used AT91 Parallel ATA driver.
    • Quentin Schulz improved the suspend/resume hooks in the atmel-spi driver to support the SAMA5D2 backup mode.
  • On Allwinner platforms:
    • Mylène Josserand has made a number of improvements to the sun8i-codec audio driver that she contributed a few releases ago.
    • Maxime Ripard added devfreq support to dynamically change the frequency of the GPU on the Allwinner A33 SoC.
    • Quentin Schulz added battery charging and ADC support to the X-Powers AXP20x and AXP22x PMICs, found on Allwinner platforms.
    • Quentin Schulz added a new IIO driver to support the ADCs found on numerous Allwinner SoCs.
    • Quentin Schulz added support for the Allwinner A33 built-in thermal sensor, and used it to implement thermal throttling on this platform.
  • On Marvell platforms:
    • Antoine Ténart contributed Device Tree changes to describe the cryptographic engines found in the Marvell Armada 7K and 8K SoCs. For now only the Device Tree description has been merged, the driver itself will arrive in Linux 4.13.
    • Grégory Clement has contributed a pinctrl and GPIO driver for the Marvell Armada 3720 SoC (Cortex-A53 based)
    • Grégory Clement has improved the Device Tree description of the Marvell Armada 3720 and Marvell Armada 7K/8K SoCs and corresponding evaluation boards: SDHCI and RTC are now enabled on Armada 7K/8K, USB2, USB3 and RTC are now enabled on Armada 3720.
    • Thomas Petazzoni made a significant number of changes to the mvpp2 network driver, finally adding support for the PPv2.2 version of this Ethernet controller. This allowed to enable network support on the Marvell Armada 7K/8K SoCs.
    • Thomas Petazzoni contributed a number of fixes to the mv_xor_v2 dmaengine driver, used for the XOR engines on the Marvell Armada 7K/8K SoCs.
    • Thomas Petazzoni cleaned-up the MSI support in the Marvell pci-mvebu and pcie-aardvark PCI host controller drivers, which allowed to remove a no-longer used MSI kernel API.
  • On the ST SPEAr600 platform:
    • Thomas Petazzoni added support for the ADC available on this platform, by adding its Device Tree description and fixing a clock driver bug
    • Thomas did a number of small improvements to the Device Tree description of the SoC and its evaluation board
    • Thomas cleaned up the fsmc_nand driver, which is used for the NAND controller driver on this platform, removing lots of unused code
  • In the MTD NAND subsystem:
    • Boris Brezillon implemented a mechanism to allow vendor-specific initialization and detection steps to be added, on a per-NAND chip basis. As part of this effort, he has split into multiple files the vendor-specific initialization sequences for Macronix, AMD/Spansion, Micron, Toshiba, Hynix and Samsung NANDs. This work will allow in the future to more easily exploit the vendor-specific features of different NAND chips.
  • Other contributions:
    • Maxime Ripard added a display panel driver for the ST7789V LCD controller

In addition, several Free Electrons engineers are also maintainers of various kernel subsystems. During this release cycle, they reviewed and merged a number of patches from kernel contributors:

  • Maxime Ripard, as the Allwinner co-maintainer, merged 94 patches
  • Boris Brezillon, as the NAND maintainer and MTD co-maintainer, merged 64 patches
  • Alexandre Belloni, as the RTC maintainer and Atmel co-maintainer, merged 38 patches
  • Grégory Clement, as the Marvell EBU co-maintainer, merged 32 patches

The details of all our contributions for this release:

About Thomas Petazzoni

Thomas Petazzoni is an embedded Linux and kernel engineer at Free Electrons. He is a lead developer of Buildroot and also a contributor to the Linux kernel. More details...
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2 Responses to Linux 4.12, Free Electrons contributions

  1. Alberto Bianchi says:

    We are developing Linus based applications for HVAC market.
    Do you have some experience on iMX6UL platform?

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