Hi Mark,
During the discussion here: https://lkml.org/lkml/2017/4/4/76
A question came up, regarding whether it's recommended to mix regmap_i2c
and plain i2c_smbus or direct adapter transfers.
In this specific case for the i2c MUX portion we need to avoid double
locks, and therefore use un-locked direct adapter transfers.
The same time we also implement a small gpiochip, where we would like to
use regmap to avoid some boilerplate code for the register cache.
What is your thought on this?
--
Greetings,
Michael
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Analog Devices GmbH Otl-Aicher Strasse 60-64 80807 München
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Geschäftsführer: Peter Kolberg, Ali Raza Husain, Eileen Wynne
On Tue, Apr 04, 2017 at 10:28:23AM +0200, Michael Hennerich wrote:
> A question came up, regarding whether it's recommended to mix regmap_i2c and
> plain i2c_smbus or direct adapter transfers.
> In this specific case for the i2c MUX portion we need to avoid double locks,
> and therefore use un-locked direct adapter transfers.
> The same time we also implement a small gpiochip, where we would like to use
> regmap to avoid some boilerplate code for the register cache.
That should work fine providing nothing tries to change cached registers
underneath the regmap. regmap won't be able to tell anything's changed
otherwise.
On 04.04.2017 14:26, Mark Brown wrote:
> On Tue, Apr 04, 2017 at 10:28:23AM +0200, Michael Hennerich wrote:
>
>> A question came up, regarding whether it's recommended to mix regmap_i2c and
>> plain i2c_smbus or direct adapter transfers.
>
>> In this specific case for the i2c MUX portion we need to avoid double locks,
>> and therefore use un-locked direct adapter transfers.
>
>> The same time we also implement a small gpiochip, where we would like to use
>> regmap to avoid some boilerplate code for the register cache.
>
> That should work fine providing nothing tries to change cached registers
> underneath the regmap. regmap won't be able to tell anything's changed
> otherwise.
Hi Mark,
Thanks for confirmation!
--
Greetings,
Michael
--
Analog Devices GmbH Otl-Aicher Strasse 60-64 80807 M?nchen
Sitz der Gesellschaft M?nchen, Registergericht M?nchen HRB 40368,
Gesch?ftsf?hrer: Peter Kolberg, Ali Raza Husain, Eileen Wynne