Re: [PATCH v4 2/7] dt-bindings: ti-lmu: Modify dt bindings for the LM3697

From: Dan Murphy
Date: Tue Oct 30 2018 - 09:40:30 EST


On 10/26/2018 03:37 AM, Pavel Machek wrote:
> Hi!
>>> Do you have an opinion on this?
>> This is this problem with the Device Tree's scope of responsibility.
>> It is defined as a means for "describing the hardware", but often
>> this rule is abused by the properties that fall into "configuration"
>> category. E.g. default-state, retain-state-suspended from leds-gpio.txt
>> or linux-default-trigger from common LED bindings.
> "retain-state-suspended" is actually hardware property. On PCs,
> (most?) LEDs will go off in suspend. On android phones, LEDs stay on
> while suspended.
> "linux-default-trigger" is actually kind-of hardware property, too. If
> LED has an icon near it (or on it), you want to use that LED in that
> meaning.
> (Thinkpad X60 has "wifi", "bluetooth", "numlock", "capslock", "hdd",
> "power", "battery", "ac" and "sleep" leds. Surely we should use them
> in that meaning?)
> Now, if someone has leds labeled "user 1..user 4" and uses
> "linux-default-trigger" there, that is kind of "more interesting".
> "default-state" is similar (subset of "linux-default-trigger"); you
> don't want power LED to go off during kernel boot...

I just want to follow up here and let you know that I have not abandoned this.
I am trying to rework and fix up the ti lmu binding as asked by Pavel. Its proving
to be a bit of a challenge based on looking forward to what will be the implementation.

I also did go offline and speak with Tony. I have a Droid 4 so I can test all of this on
production hardware as well.

Updated patchset will take some time to get out.


> Pavel

Dan Murphy