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

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Message-ID: <46624fe6-c767-1872-c8c0-06cbf9a59e05@ti.com>
Date:   Mon, 4 Mar 2019 13:14:04 -0600
From:   Dan Murphy <dmurphy@...com>
To:     Pavel Machek <pavel@....cz>
CC:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Rob Herring <robh@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-leds@...r.kernel.org>,
        <lee.jones@...aro.org>, <tony@...mide.com>
Subject: Re: [PATCH v4 2/7] dt-bindings: ti-lmu: Modify dt bindings for the
 LM3697

Pavel

On 3/2/19 5:07 PM, Pavel Machek wrote:
> Hi!
> 
>> 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.
> 
> Is there any progress here?
> 
> This is needed for display on Droid 4, so it is somehow
> important... and Milo Kim's patches are pretty reasonable.
> 
> I still believe best way forward is to merge them, and let you submit
> any improvements on top of them...
> 

I had looked at this a while back.  And I will pick this up again as it seems that the
multi color framework will take longer than expected.

For the Droid 4 it uses the lm3552 backlight driver, at least that is what is in the DT.

There is a lm3530 backlight driver that is already available and could be upgraded to DT support and have the lm3552
added to it but the issues are the 3532 has 3 outputs and the 3530 has 1 and the register map is a bit different.

There are register differences between the two devices but the driver already has ramp support, PWM support (exponential/linear),
ALS support and manual support already available along with user space configuration.

I was working on creating a new lm3532 driver based off the lm3530 driver or adapting the 3530 to include the 3532 and
making the driver generic to this family.

Dan

> Best regards,
> 									Pavel
> 

-- 
------------------
Dan Murphy