Max22007 dev

[jansunil]

PR Description

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  necessary to understand them. List any dependencies required for this change.
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PR Type

• Bug fix (a change that fixes an issue)
• New feature (a change that adds new functionality)
• Breaking change (a change that affects other repos or cause CIs to fail)

PR Checklist

• I have conducted a self-review of my own code changes
• I have compiled my changes, including the documentation
• I have tested the changes on the relevant hardware
• I have updated the documentation outside this repo accordingly
• I have provided links for the relevant upstream lore

[gastmaier]

Hi @jansunil overall looks good, just some comments from my side.
I believe we can drop the crc feature and really streamline the driver reg access as a consequence.

Best regards,

[nunojsa]

I'll wait this getting out of draft to jump in :)

[nunojsa]

Here it goes my first round. Couple more points:

• In the bindings patch do not day "...Add MAX22007 DAC bindings". I mean, dont mention "bindings". Its already obvious from the prefix. So instead say something like "Document MAX22007 DAC". Also refactor a bit the message and add a small description of the device.
• Also refactor the driver patch commit message. See git log for other examples. Give a small description of the device. It is also a fairly simple driver so I do not think there is any meaningful to state about the implementation in the commit message.

Regarding process, note that I expect this PR to be opened against main (without the overlay). Then after merged with main, you can open a PR against the PI branch only with the overlay.

[jansunil]

Changelog V2:

    1) Remove description for spi max frequency in the yaml
2) Remove "|" character in the yaml
3) Add a default field in the properties wherever required
4) Add regmap in the Kconfig
5) Correct copyright year in the driver
6) Rearrange includes in alphabetical order and add  missing includes
7) Pass SPI buffers into state structure
8) Reformat code to meet 80 column limit
9) Remove redundant masking of buffer elements in max22007_spi_reg_write()
10) Remove locking within APIs
11) Remove explicit function for softreset and use regmap directly
12) Add macros for MAX value check for DAC Raw data
13) Implement custom regmap bus
14) Removed caching of channel configuration as it is not used again
15) Add validation for values passed from devicetree
16) Remove spi_setup
17) Add extra spaces at necessary lines of code
18) Parse CRC value from devicetree inside the max22007_configure_crc()
19) Return error code from max22007_parse_channel_cfg() and add an argument to capture the number of channels
20) Add RESET pin gpio support
21) Switch the CRC functionality to use adi,crc-disable instead of adi,crc-enable
22) Remove CRC from the Tx buffer during SPI read operations
    23) Add ABI documentation for per channel LDAC update