cpufreq: qcom-hw: Add support for QCOM cpufreq HW

[v13]
* Update Documentation binding to #freq-domain-cells in description.
* Replace devm_ioremap_resource() to use devm_ioremap() API.

[v12]
* Remove per-cpu domain global structure.

[v11]
* Updated the code logic as per Stephen.
* Default boost enabled is removed.
* Update the clock name to use "alternate" for GPLL0 source in code and Documentation binding.
* Module description updated.
* perf_base updated to perf_state_reg.

[v10]
* Update Documentation binding for cpufreq node.
* Make the driver 'tristate' instead of 'bool' and update code.
* Update the clock name to reflect the hardware name.
* Remove support for varying offset.

[v9]
* Update the Documentation binding for freq-domain-cells & cpufreq node.
* Address comments in Kconfig.arm & Makefile.
* Remove include file & MODULE_DESCRIPTION not required.
* Fix the code for 'of_node_put(cpu_np)'.

[v8]
* Address comments to update code to take cpufreq_hw phandle and index from the CPU nodes.
* Updated the Documentation for the above change in DT.
* Updated logic for assigning 'qcom_freq_domain_map' for related CPUs.
* Clock input to the HW block is taken from DT which has been updated in code and Device tree documentation.

[v7]
* Updated the logic to check for related CPUs.

[v6]
* Renamed match table 'qcom_cpufreq_hw_match'.
* Renamed 'qcom_read_lut' to 'qcom_cpufreq_hw_read_lut'.
* Updated the logic to check for related CPUs at the beginning of the 'qcom_cpu_resources_init'.
* Use devm_ioremap_resource instead of devm_ioremap.
* Update the use of of_node_put to handle error conditions.
* Use policy->cached_resolved_idx in fast switch callback.
* Keep precalculated offsets 'reg_bases'.
* XO clock is taken from Device tree.
* Update documentation binding for clocks/clock-names.
* Minor comments in Kconfig.arm.
* Comments to move dev_info to dev_dbg.

[v5]
* Remove mapping different register regions of perf/lut/enable, instead map the entire HW region.
* Add reg_offset/cpufreq_qcom_std_offsets to be supplied as device data.
* Check of src == 0 during lut read.
* Add of_node_put(cpu_np) in qcom_get_related_cpus
* Update the qcom_cpu_resources_init for register offset data, and cleanup the related cpus to keep a single copy of CPUfreq.
* Replace FW with HW, update Kconfig, rename filename qcom-cpufreq-hw.c
* Update the documentation binding to reflect the changes of mapping the
* entire HW region.

[v4]
* Fixed console messages as per comments.
* Return error from qcom_resources_init()
in the cases where failed to get frequency domain.
* Rename cpu_dev to cpu_np in qcom_resources_init, qcom_get_related_cpus(). Also use temp variable freq_np in qcom_get_related_cpus().
* Update qcom_cpufreq_fw_get() to use the policy data to incoporate the hotplug use case.
* Update code to use of fast_switching.
* Check for !c->max_cores instead of cpumask_empty in qcom_get_related_cpus().
* Update the logic of assigning 'c' to qcom_freq_domain_map[cpu].

[v3]
* Remove index check from 'qcom_cpufreq_fw_target_index'.
* Update the Documentation binding to add the platform specific properties in the CPU nodes, node name "qcom,freq-domain".
* Update return value to '0' from -ENODEV from 'qcom_cpufreq_fw_get'.
* Update the logic for boost frequency to use local variables instead of cpufreq driver data in 'qcom_read_lut'.
* Update the logic in 'qcom_get_related_cpus' to find the related cpus.
* Update the reg-names to remove "_base" and also update the binding with the description of these registers.
* Update the logic in 'qcom_resources_init' to address the new device tree notation of handling the frequency domain phandles.

[v2]
* Fixed the alignment issues in "qcom_cpufreq_fw_target_index" for dev_err and also for "qcom_cpu_resources_init".
* Removed ret = 0 from qcom_get_related_cpus and added to check for cpu_mask_empty to return -ENOENT.
* Fixes qcom_cpu_resources_init function
* Remove initialization of 'index'
* Check for valid 'c'
* Removed initialization of 'prev_cc' from 'qcom_read_lut'.

Taniya Das (2):
dt-bindings: cpufreq: Introduce QCOM CPUFREQ Firmware bindings
cpufreq: qcom-hw: Add support for QCOM cpufreq HW driver

 .../bindings/cpufreq/cpufreq-qcom-hw.txt           | 172 ++++++++++++
 drivers/cpufreq/Kconfig.arm                        |  11 +
 drivers/cpufreq/Makefile                           |   1 +
 drivers/cpufreq/qcom-cpufreq-hw.c                  | 308 +++++++++++++++++++++
 4 files changed, 492 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.txt
 create mode 100644 drivers/cpufreq/qcom-cpufreq-hw.c

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