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68cf3d9c46
According to SPI signal test results:
(1) When using SPI IOs under 3.3V power domain, need to increase
driver strength to level3.
(2) When using SPI IOs under 1.8V power domain, use default driver
strength(level2) is best.
Change-Id: I0404418256d4f9671393345bf44ffd4e285af584
Signed-off-by: Xuhui Lin <xuhui.lin@rock-chips.com>
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.