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On Qualcomm platforms, most subsystems (e.g. audio/modem DSP) are described as remote processors in the device tree, with a dedicated node where properties and services related to them can be described. The Resource Power Manager (RPM) is also such a subsystem, with a remote processor that is running a special firmware. Unfortunately, the RPM never got a dedicated node representing it properly in the device tree. Most of the RPM services are described below a top-level /smd or /rpm-glink node. However, SMD/GLINK is just one of the communication channels to the RPM firmware. For example, the MPM interrupt functionality provided by the RPM does not use SMD/GLINK but writes directly to a special memory region allocated by the RPM firmware in combination with a mailbox. Currently there is no good place in the device tree to describe this functionality. It doesn't belong below SMD/GLINK but it's not an independent top-level device either. Introduce a new "qcom,rpm-proc" compatible that allows describing the RPM as a remote processor/subsystem like all others. The SMD/GLINK node is moved to a "smd-edge"/"glink-edge" subnode consistent with other existing bindings. Additional subnodes (e.g. interrupt-controller for MPM, rpm-master-stats) can be also added there. Deprecate using the old top-level /smd node since all SMD edges are now specified as subnodes of the remote processor. Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20230531-rpm-rproc-v3-6-a07dcdefd918@gerhold.net Signed-off-by: Bjorn Andersson <andersson@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 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.