Re: [RFC][PATCH v3 1/3] runtime interpreted power sequences

On Fri, Jul 27, 2012 at 09:05:48PM +0900, Alexandre Courbot wrote:

Some device drivers (panel backlights especially) need to follow precise
sequences for powering on and off, involving gpios, regulators, PWMs
with a precise powering order and delays to respect between each steps.
These sequences are board-specific, and do not belong to a particular
driver - therefore they have been performed by board-specific hook
functions to far.

With the advent of the device tree and of ARM kernels that are not
board-tied, we cannot rely on these board-specific hooks anymore but
need a way to implement these sequences in a portable manner. This patch
introduces a simple interpreter that can execute such power sequences
encoded either as platform data or within the device tree.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
---
 Documentation/power/power_seq.txt | 120 +++++++++++++++
 drivers/base/Kconfig              |   4 +
 drivers/base/Makefile             |   1 +
 drivers/base/power_seq.c          | 300 ++++++++++++++++++++++++++++++++++++++
 include/linux/power_seq.h         | 139 ++++++++++++++++++

What's wrong with drivers/power/?  I sure don't want to maintain this
code, and it seems to not be part of the "driver core" infrastructure.

thanks,

greg k-h