6d366d0e54
There are two genpd (as required-opp) cases that we need to handle, devices with a single genpd and ones with multiple genpds. The multiple genpds case is clear, where the OPP core calls dev_pm_domain_attach_by_name() for them and uses the virtual devices returned by this helper to call dev_pm_domain_set_performance_state() later to change the performance state. The single genpd case however requires special handling as we need to use the same `dev` structure (instead of a virtual one provided by genpd core) for setting the performance state via dev_pm_domain_set_performance_state(). As we move towards more generic code to take care of the required OPPs, where we will recursively call dev_pm_opp_set_opp() for all the required OPPs, the above special case becomes a problem. It doesn't make sense for a device's DT entry to have both "opp-level" and single "required-opps" entry pointing to a genpd's OPP, as that would make the OPP core call dev_pm_domain_set_performance_state() for two different values for the same device structure. And so we can reuse the 'opp->level" field in such a case and call _set_opp_level() for the device. Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Stephan Gerhold <stephan.gerhold@kernkonzept.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.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.