Re: [PATCH v3 00/16] DT/core: update cpu device of_node

[Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@arm.com>]

On 22/07/13 12:32, Sudeep KarkadaNagesha wrote:
> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
> 
> As more and more information is getting added into the cpu node, the number
> of drivers needing to parse the device tree for CPU nodes are increasing.
> Most of the time, the information needed from the cpu node is preferred
> in the logical CPU order. Hence many drivers first parse and search the
> CPU node, match them to logical index if needed and then search for the
> required property inside a particular cpu node. Some of them assume the
> logical and physical CPU ordering to be same which is incorrect.
> 
> This patch series initialises the of_node in all the cpu devices when
> registering the CPU device.
> 1. This avoids different drivers having to parse the cpu nodes to obtain
>    different attributes like operating points, latency,...etc.
> 2. This handles different physical and logical cpu ordering which is not
>    the case in current code.
> 3. Also all the cpu nodes will have their of_node initialised correctly.
>    Currently different drivers assign them partially and incorrectly.
> 4. Removes all the reduntant parsing in various drivers.
> 
> Changes v2->v3:
> 1. Added new OF helper to get of_node from the cpu logical index.
>    With the use of this help, removed lots of duplicated code from
>    cpufreq drivers.
> 2. Fixed issue with property length calculation in of_get_cpu_node.
>    (previously had assumed of_get_property returns number of cells)
> 3. Changed return type of arch_match_cpu_phys_id to bool(as suggested by Nico)
> 4. Re-ordered patch 2 and 3, and few typo fixes.
> 5. Rebased on v3.11-rc2(to avoid any conflicts with __cpuinit* deletion)
> 
> Changes v1->v2:
> 1. Moved most of arch_of_get_cpu_node to OF/DT core as of_get_cpu_node
>    adding a provision for architecture specific hooks for matching
>    logical and physical ids.
> 2. Extended removal of DT cpu node parsing to PPC cpufreq drivers
> 3. Added Acks from Viresh and Shawn
> 
> Regards,
> Sudeep
> 
> Sudeep KarkadaNagesha (16):
Hi Rob,Olof,Rafael,

Since these changes are spread across multiple sub-systems, is it fine
if I split this and send pull request as below:

1. DT
   of: add support for retrieving cpu node for a given logical cpu index
   ARM: DT/kernel: define ARM specific arch_match_cpu_phys_id
   driver/core: cpu: initialize of_node in cpu's device struture
   of/device: add helper to get cpu device node from logical cpu index
2. ARM SoC(clearly specifying dependency on 1)
   ARM: topology: remove hwid/MPIDR dependency from cpu_capacity
   ARM: mvebu: remove device tree parsing for cpu nodes
   drivers/bus: arm-cci: avoid parsing DT for cpu device nodes
3. CPUFreq(clearly specifying dependency on 1)
   cpufreq: imx6q-cpufreq: remove device tree parsing for cpu nodes
   cpufreq: cpufreq-cpu0: remove device tree parsing for cpu nodes
   cpufreq: highbank-cpufreq: remove device tree parsing for cpu nodes
   cpufreq: spear-cpufreq: remove device tree parsing for cpu nodes
   cpufreq: kirkwood-cpufreq: remove device tree parsing for cpu nodes
   cpufreq: arm_big_little: remove device tree parsing for cpu nodes
   cpufreq: maple-cpufreq: remove device tree parsing for cpu nodes
   cpufreq: pmac64-cpufreq: remove device tree parsing for cpu nodes
   cpufreq: pmac32-cpufreq: remove device tree parsing for cpu nodes

Regards,
Sudeep

>  arch/arm/kernel/devtree.c           |  5 +++
>  arch/arm/kernel/topology.c          | 61 ++++++++++---------------------
>  arch/arm/mach-imx/mach-imx6q.c      |  3 +-
>  arch/arm/mach-mvebu/platsmp.c       | 52 +++++++++++++--------------
>  drivers/base/cpu.c                  |  2 ++
>  drivers/bus/arm-cci.c               | 28 ++++-----------
>  drivers/cpufreq/arm_big_little_dt.c | 40 ++++++++-------------
>  drivers/cpufreq/cpufreq-cpu0.c      | 23 +++---------
>  drivers/cpufreq/highbank-cpufreq.c  | 18 ++++------
>  drivers/cpufreq/imx6q-cpufreq.c     |  4 +--
>  drivers/cpufreq/kirkwood-cpufreq.c  |  8 +++--
>  drivers/cpufreq/maple-cpufreq.c     | 23 ++----------
>  drivers/cpufreq/pmac32-cpufreq.c    |  5 +--
>  drivers/cpufreq/pmac64-cpufreq.c    | 47 ++++++------------------
>  drivers/cpufreq/spear-cpufreq.c     |  4 +--
>  drivers/of/base.c                   | 72 +++++++++++++++++++++++++++++++++++++
>  include/linux/of.h                  |  6 ++++
>  include/linux/of_device.h           | 15 ++++++++
>  18 files changed, 200 insertions(+), 216 deletions(-)
>