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b7cc4ca946
The Linux support for controlling card power via regulators appears to be contentious. I would argue that the default behaviour is contrary to the SDHCI spec - turning off the power writes a reserved value to the SD Bus Voltage Select field of the Power Control Register, which seems to kill the Arasan/iProc controller - but fortunately there is a hook in sdhci_ops to override the behaviour. Borrow the implementation from sdhci_arasan_set_power. Signed-off-by: Phil Elwell <phil@raspberrypi.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 Restructured Text 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.