Re: [PATCH v6 1/4] Runtime Interpreted Power Sequences

On Thursday 13 September 2012 13:45:39 Tomi Valkeinen wrote:

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On Wed, 2012-09-12 at 18:57 +0900, Alexandre Courbot wrote:

quoted

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.

The sequences are not board-specific, they are device (backlight, etc.)
specific. The sequences have been handled in board-specific hook
functions so far because there hasn't been proper drivers for the
devices.

If I were to take the same panel (and backlight) you have and install it
on my board, I would need the same power sequence.

You could also have power sequences that control a set of GPIOs for an 
external interface (and would then be more board-specific), but you are right 
that for most of the case power seqs apply to devices and this statement is 
misleading. I will fix that in the commit message and wherever this might 
appear.

Alex.