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The coresight drivers relied on default bindings for graph in DT, while reusing the "reg" field of the "ports" to indicate the actual hardware port number for the connections. This can cause duplicate ports with same addresses, but different direction. However, with the rules getting stricter for the address mismatch with the label, it is no longer possible to use the port address field for the hardware port number. This patch introduces new DT binding rules for coresight components, based on the same generic DT graph bindings, but avoiding the address duplication. - All output ports must be specified under a child node with name "out-ports". - All input ports must be specified under a childe node with name "in-ports". - Port address should match the hardware port number. The support for legacy bindings is retained, with a warning. Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Rob Herring <robh@kernel.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.