linux-kernel - Re: [PATCH 3/3] iio: light: bd27008: Support BD27010 RGB

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Date:   Tue, 20 Jun 2023 11:06:19 +0300
From:   Matti Vaittinen <mazziesaccount@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] iio: light: bd27008: Support BD27010 RGB

On 6/17/23 22:57, Jonathan Cameron wrote:
> On Tue, 13 Jun 2023 13:20:26 +0300
> Matti Vaittinen <mazziesaccount@...il.com> wrote:
> 
>> The ROHM BU27010 is an RGBC sensor with a flickering detection FIFO. The
>> RGBC+IR sensor functionality is largely similar to what the BU27008 has.
>> There are some notable things though:
>>    - gain setting is once again new and exotic. Now, there is 6bit gain
>>      setting where 4 of the bits are common to all channels and 2 bits
>>      can be configured separately for each channel. The BU27010 has
>>      similar "1X on other channels vs 2X on IR when selector is 0x0"
>>      gain design as BU27008 had. So, we use same gain setting policy for
>>      BU27010 as we did for BU27008 - driver sets same gain selector for all
>>      channels but shows the gains separately for all channels so users
>>      can (at least in theory) detect this 1X vs 2X madness...
>>    - BU27010 has suffled all the control register bitfields to new
>>      addresses and bit positions while still keeping the register naming
>>      same.
>>    - Some more power/reset control is added.
>>    - FIFO for "flickering detection" is added.
>>
>> The control register suffling made this slightly nasty. Still, it is
>> easier for maintenance perspective to add the BU27010 support in BU27008
>> driver because - even though the bit positions/addresses were changed -
>> most of the driver structure can be re-used. Writing own driver for
>> BU27010 would mean plenty of duplicate code albeit a tad more clarity.
>>
>> The flickering FIFO is not supported by the driver.
>>
>> Add BU27010 RGBC+IR support to rohm-bu27008 driver.
>>
>> Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
>>
> 
> Resulting code looks more or less fine, but there is stuff in here that
> belongs in previous patch - so send a v2 with the refactors all done
> there and just support for the new part in here.

Thanks for the review! I appreciate it. And sorry for sending a messy 
version. I'll try re-organizing the stuff between these two patches when 
re-spinning. A bit busy now as I said when replying to review of PATCH 
2/3 - but I'll see when I get a moment to rework this :) Thanks!

Yours,
	-- Matti

-- 
Matti Vaittinen
Linux kernel developer at ROHM Semiconductors
Oulu Finland

~~ When things go utterly wrong vim users can always type :help! ~~