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96a299d24c
The smmu needs to be functional only when the respective master's using it are active. The device_link feature helps to track such functional dependencies, so that the iommu gets powered when the master device enables itself using pm_runtime. So by adapting the smmu driver for runtime pm, above said dependency can be addressed. This patch adds the pm runtime/sleep callbacks to the driver and the corresponding bulk clock handling for all the clocks needed by smmu. Also, while we enable the runtime pm, add a pm sleep suspend callback that pushes devices to low power state by turning the clocks off in a system sleep. Add corresponding clock enable path in resume callback as well. Signed-off-by: Sricharan R <sricharan@codeaurora.org> Signed-off-by: Archit Taneja <architt@codeaurora.org> [Thor: Rework to get clocks from device tree] Signed-off-by: Thor Thayer <thor.thayer@linux.intel.com> [vivek: rework for clock and pm ops] Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org> Reviewed-by: Tomasz Figa <tfiga@chromium.org> Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Tested-by: Thor Thayer <thor.thayer@linux.intel.com> Signed-off-by: Will Deacon <will.deacon@arm.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.
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.