[PATCH v4 2/6] of: Add helper for mapping device node to logical CPU number

[Rob Herring]

On Mon, Aug 7, 2017 at 4:52 AM, Suzuki K Poulose <suzuki.poulose at arm.com> wrote:
> Add a helper to map a device node to a logical CPU number to avoid
> duplication. Currently this is open coded in different places (e.g
> gic-v3, coresight). The helper tries to map device node to a "possible"
> logical CPU id, which may not be online yet. It is the responsibility
> of the user to make sure that the CPU is online. The helper uses
> of_get_cpu_node() which uses arch specific backends to match the phyiscal
> ids.
>
> Cc: devicetree at vger.kernel.org
> Cc: Frank Rowand <frowand.list at gmail.com>
> Cc: Rob Herring <robh+dt at kernel.org>
> Cc: Mark Rutland <mark.rutland at arm.com>
> Cc: Sudeep Holla <sudeep.holla at arm.com>
> Reviewed-by: Marc Zyngier <marc.zyngier at arm.com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose at arm.com>
> ---
> Changes since V3:
>  - Renamed the helper to of_cpu_node_to_id(), suggested by Rob
>  - Return -ENODEV on failure than nr_cpus_id
> ---
>  drivers/of/base.c  | 26 ++++++++++++++++++++++++++
>  include/linux/of.h |  7 +++++++
>  2 files changed, 33 insertions(+)

Reviewed-by: Rob Herring <robh at kernel.org>