Subject: Use of pinctrl-single for external device over I2C

From: [email-masked] (Vaibhav Hiremath)
Date: Wed, 24 Jun 2015 22:40:16 +0530

On Wednesday 24 June 2015 07:03 PM, Tony Lindgren wrote:
> * Vaibhav Hiremath <[email-masked]> [150624 05:06]:
>> On Tuesday 23 June 2015 04:25 PM, Vaibhav Hiremath wrote:
>>>
>>> /*
>>>   * REVISIT: Reads and writes could eventually use regmap or something
>>>   * generic. But at least on omaps, some mux registers are performance
>>>   * critical as they may need to be remuxed every time before and after
>>>   * idle. Adding tests for register access width for every read and
>>>   * write like regmap is doing is not desired, and caching the registers
>>>   * does not help in this case.
>>>   */
>>>
>>>
>>> Should be not have flag for this and use regmap_ variants? If we
>>> implement flag based approach then same driver can be reused for pinmux
>>> configuration of external device.
>
> Nothing stopping you from adding regmap support to it. It just needs
> to be made optional as the users so far don't need it.
>

Yeah, absolutely.

Thinking more on this,

I do not like this, as this is not HW feature, so DT may not be right
approach.

So I will dig more from either runtime or Compile time option to use
regmap_ Vs raw read/writes.

Thanks,
Vaibhav