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a9ba290d0b
determine_rate() callback is used by the clk_set_rate() API to get the
closest rate of the target rate supported by the clock. If this callback
is not implemented (nor round_rate() callback), then the API will assume
that the clock cannot set the requested rate. And since there is no parent,
it will return -EINVAL.
This is not an issue right now as clk_set_rate() mistakenly compares the
target rate with cached rate and bails out early. But once that is fixed
to compare the target rate with the actual rate of the clock (returned by
recalc_rate()), then clk_set_rate() for this clock will start to fail as
below:
cpu cpu0: _opp_config_clk_single: failed to set clock rate: -22
So implement the determine_rate() callback that just returns the actual
rate at which the clock is passed to the CPUs in a domain.
Fixes:
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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.