linux-kernel - Re: [PATCH v5 2/2] iio: dac: driver for MCP4821

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Date: Thu, 21 Dec 2023 22:46:36 +0530
From: Anshul Dalal <anshulusr@...il.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>,
 Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 linux-kernel-mentees@...ts.linuxfoundation.org,
 Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v5 2/2] iio: dac: driver for MCP4821

On 12/21/23 22:37, Jonathan Cameron wrote:
> On Wed, 20 Dec 2023 20:49:53 +0530
> Anshul Dalal <anshulusr@...il.com> wrote:
> 
>> Adds driver for the MCP48xx series of DACs.
>>
>> Device uses a simplex SPI channel. To set the value of an output channel,
>> a 16-bit data of following format must be written:
>>
>> Bit field | Description
>> 15 [MSB]  | Channel selection bit
>>             0 -> Channel A
>>             1 -> Channel B
>> 13        | Output Gain Selection bit
>>             0 -> 2x Gain (Vref = 4.096V)
>>             1 -> 1x Gain (Vref = 2.048V)
>> 12        | Output Shutdown Control bit
>>             0 -> Shutdown the selected channel
>>             1 -> Active mode operation
>> 11-0 [LSB]| DAC Input Data bits
>>             Value's big endian representation is taken as input for the
>>             selected DAC channel. For devices with a resolution of less
>>             than 12-bits, only the x most significant bits are considered
>>             where x is the resolution of the device.
>> Reference: Page#22 [MCP48x2 Datasheet]
>>
>> Supported devices:
>>   +---------+--------------+-------------+
>>   | Device  |  Resolution  |   Channels  |
>>   |---------|--------------|-------------|
>>   | MCP4801 |     8-bit    |      1      |
>>   | MCP4802 |     8-bit    |      2      |
>>   | MCP4811 |    10-bit    |      1      |
>>   | MCP4812 |    10-bit    |      2      |
>>   | MCP4821 |    12-bit    |      1      |
>>   | MCP4822 |    12-bit    |      2      |
>>   +---------+--------------+-------------+
>>
>> Devices tested:
>>   MCP4821 [12-bit single channel]
>>   MCP4802 [8-bit dual channel]
>>
>> Tested on Raspberry Pi Zero 2W
>>
>> Datasheet: https://ww1.microchip.com/downloads/en/DeviceDoc/22244B.pdf #MCP48x1
>> Datasheet: https://ww1.microchip.com/downloads/en/DeviceDoc/20002249B.pdf #MCP48x2
>> Signed-off-by: Anshul Dalal <anshulusr@...il.com>
> 
> I've applied this to my tree with a few formatting tweaks. However, timing is such
> that, unless 6.7 release is delayed, the merge window will open too soon for me
> to get another pull request in.  A such this is now almost certainly queued up
> for the 6.9 cycle in a few months time.  That's probably a good thing anyway as
> some people will already be on vacation and may want to take another look at this
> when then get back.
> 
> Applied to the togreg branch of iio.git and pushed out as testing for 0-day
> to take a look at it.
> 

Thanks for the code reviews and help in getting this and my other
drivers (ltr390 and ags02ma) ready for upstream. I wish to contribute
more in the upcoming year.

Best Wishes,
Anshul