Re: [PATCH v4 12/12] staging: most: Documentation: update driver documentation

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Hi Chris,

We really appreciate your feedback. Thanks for that.

For us going the vanilla way roughly means backporting to v4.14:
 - v5.1-rc5 MOST state (easy/straightforward)
 - MOST patches from either
   https://github.com/CogentEmbedded/meta-rcar/
   or https://github.com/microchip-ais/meta-medialb-rcar
 - A number of patches from mld-1.8.0

>From the above list, the last step looks a bit more painful, but we
will try to deal with that.

If there are any mainline-relevant fixes developed on the way, we hope
to find some time to submit them to you and get feedback.

Best regards,
Eugeniu.

On Wed, Apr 17, 2019 at 01:45:41PM +0000, Christian.Gromm@xxxxxxxxxxxxx wrote:
> On Mo, 2019-04-15 at 23:21 +0200, Eugeniu Rosca wrote:
> > External E-Mail
> > 
> > 
> > Hello Christian, hello Andrey,
> > cc: Vladimir Barinov
> > cc: linux-renesas-soc
> > 
> > Our team currently has the requirement of adding MOST support to
> > the v4.14-based R-Car3 kernel [1], matching the level of features
> > and interfaces of mld-1.8.0 [2] release.
> > 
> > Based on a quick check [3], the mld-1.8.0 release contains 221 non-
> > merge
> > non-mainline commits. It seems like at least some (most?) of them
> > have
> > been reworked during upstreaming and are now part of vanilla, thanks
> > to
> > your efforts.
> > 
> > Since you've actively participated in pushing the out-of-tree drivers
> > to mainline, could you please share your gut feeling whether the
> > current mainline state of the MOST subsystem matches the mld-1.8.0
> > release in terms of features and interfaces?
> > 
> 
> No, it doesn't. The version upstream does not have all the bells
> and whistles the mld-1.8.0 version has, yet. Focus of the latest
> mainline commits was on the driver model and the switch to configfs.
> 
> > At first glance, such mld-1.8.0 functionalities like "flexible PCM
> > rate support" [4], as well as a number of dim2 sysfs entries [5-8]
> > appear to be missing in v5.1-rc5. Could you please feedback if these
> > have been deliberately dropped or didn't make their way for another
> > reason? What would be your recommendation between going the mld-1.8.0
> > and going the v5.1-rc5 way for MOST?
> > 
> 
> The functionalities you're referring to have _not_ intentionally been
> dropped. They will find their way into mainline. If there are urgent
> feature requests, we could prioritize them.
> 
> Bottom line is, the upstream version is the one you should be using,
> as it is going to replace the mld-1.x branch. This is exactly what we
> will soon be doing for AGL by the way.
> 
> thanks,
> Chris



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