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1871e6f7c5
Ringneck v1.4 can contain (placement option) an on-board ATtiny microcontroller instead of an STM32. In normal operation, this is transparent to the software, as both microcontrollers emulate the same ICs (amc6821 and isl1208). For flashing the ATtiny, the SWITCH_REG1 regulator of the board's PMIC is used to enable the ATtiny UPDI debug interface. If the STM32 is placed, or if we are running on an older Ringneck revision, SWITCH_REG1 is not connected and has no effect. Add attiny-updi-gate-regulator so userspace can control it via sysfs (needs CONFIG_REGULATOR_USERSPACE_CONSUMER): echo enabled > /sys/devices/platform/attiny-updi-gate-regulator/state Signed-off-by: Jakob Unterwurzacher <jakob.unterwurzacher@cherry.de> Tested-by: Quentin Schulz <quentin.schulz@cherry.de> Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de> Link: https://lore.kernel.org/r/20240926132028.21910-1-jakob.unterwurzacher@cherry.de Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.