Purism and the Linux Kernel

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Guido Günther

Phone Developer

Latest posts by Guido Günther (see all)

• Developing for Mobile Linux with Phosh – Part 0: Running Nested - February 21, 2023
• Phosh 2022 in Retrospect - January 9, 2023
• Kerberos authentication on the Librem 5 - October 27, 2022

Purism contributes to several free software projects such as GNOME, wlroots and Debian.

We’re especially proud of our kernel contributions – where 13 patches have made it into 5.1. Since this is our first installment, it also includes the changes that went into 5.0 and 4.20. Bellow is a list of our most recent contributions.

Let’s start with support for the Librem5 dev kit’s charge controller:

• power: supply: bq25890_charger: Read back the current battery voltage
• power: supply: bq25890_charger: Add the BQ25896 part
• power: supply: bq25890_charger: Remove unused table entries
• power: supply: bq25890_charger: Add debugging output of failed initialization

SDMA fix for i.MX8mq [needed for SAI (audio)]:

• dmaengine: imx-sdma: fix consistent dma test failures
• dmaengine: imx-sdma: add a test for imx8mq multi sdma devices
• dmaengine: imx-sdma: add clock ratio 1:1 check

Support for the Librem5 dev kit’s touch screen:

• Input: goodix: print values in case of inconsistencies
• Input: goodix: refer to touchscreen.txt in device tree bindings
• Input: goodix: support Goodix gt5688

Finally, here are some miscellaneous i.MX8-related fixes and device tree additions:

• dt-bindings: imx8mq: Number clocks consecutively
• arm64: dts: imx8mq: Add pwm device nodes
• pinctrl: imx-scu: Depend on IMX_SCU

We also contributed Tested-by and Reviewed-by to five patches.

There’s more to come for the 5.2 kernel, as there are 14 patches staged in linux-next already, and we have gotten some friendly reviews for other parts. Stay tuned for more details getting us closer to make the Librem5 dev kit bootable with a mainline kernel, and many thanks to all the reviewers!