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82e12d9e0b
The existing dev_pm_domain_attach() function, allows a single PM domain to be attached per device. To be able to support devices that are partitioned across multiple PM domains, let's introduce a new interface, dev_pm_domain_attach_by_id(). The dev_pm_domain_attach_by_id() returns a new allocated struct device with the corresponding attached PM domain. This enables for example a driver to operate on the new device from a power management point of view. The driver may then also benefit from using the received device, to set up so called device-links towards its original device. Depending on the situation, these links may then be dynamically changed. The new interface is typically called by drivers during their probe phase, in case they manages devices which uses multiple PM domains. If that is the case, the driver also becomes responsible of managing the detaching of the PM domains, which typically should be done at the remove phase. Detaching is done by calling the existing dev_pm_domain_detach() function and for each of the received devices from dev_pm_domain_attach_by_id(). Note, currently its only genpd that supports multiple PM domains per device, but dev_pm_domain_attach_by_id() can easily by extended to cover other PM domain types, if/when needed. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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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 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.