Florian Fainelli [off-list ref] writes:

On 15/12/15 13:40, Eric Anholt wrote:

quoted

From: Alexander Aring <redacted>

This patch adds support for several power domains on Raspberry Pi,
including USB (so it can be enabled even if the bootloader didn't do
it), and graphics.

This patch is the combined work of Eric Anholt (who wrote USB support
inside of the Raspberry Pi firmware driver, and wrote the non-USB
domain support) and Alexander Aring (who separated the original USB
work out from the firmware driver).

Signed-off-by: Alexander Aring <redacted>
Signed-off-by: Eric Anholt <redacted>
---

v2: Add support for power domains other than USB, using the new
    firmware interface, reword commit message (changes by Eric)

v3: Restructure as a builtin driver, and drop
    of_genpd_add_provider_onecell error handling to avoid
    pm_genpd_exit() dependency until that API can be settled.  Clean
    up copyright header, add missing ISP initialization, and fix typo
    in transposer's name.

 arch/arm/mach-bcm/Kconfig                   |  10 ++
 arch/arm/mach-bcm/Makefile                  |   1 +
 arch/arm/mach-bcm/raspberrypi-power.c       | 247 ++++++++++++++++++++++++++++
 include/dt-bindings/arm/raspberrypi-power.h |  41 +++++
 4 files changed, 299 insertions(+)
 create mode 100644 arch/arm/mach-bcm/raspberrypi-power.c

What motivated the location of this power domain driver in
arch/arm/mach-bcm? Should not we have this in drivers/power/ or
somewhere in drivers/ at the very least?

ls stronly suggests that power contains drivers for power supplies and
batteries, not power domains.  There are 6 power domain drivers in
arch/arm, 3 in drivers/clk, and 3 in drivers/soc.