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There are two ways to set the output voltage of the LD05 regulator. First by writing to the voltage selection registers and second by toggling the SD_VSEL signal. Usually board designers connect SD_VSEL to the VSELECT signal controlled by the USDHC controller, but in some cases the signal is hardwired to a fixed low level (therefore selecting 3.3V as initial value for allowing to boot from the SD card). In these cases, the voltage is only determined by the value of the LDO5CTRL_L register. Introduce a property nxp,sd-vsel-fixed-low to let the driver know that SD_VSEL is low and there is no GPIO to actually get that information from dynamically. Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de> Link: https://patch.msgid.link/20250303132258.50204-1-frieder@fris.de Signed-off-by: Mark Brown <broonie@kernel.org>
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.