Re: [net-next PATCH v11 5/9] mfd: an8855: Add support for Airoha AN8855 Switch MFD

Vladimir Oltean
2024-12-17T15:36:14Z

On Tue, Dec 17, 2024 at 05:13:39PM +0200, Vladimir Oltean wrote:
> On Sat, Dec 14, 2024 at 04:11:54PM +0100, Christian Marangi wrote:
> > We can see that:
> > - as suggested regmap doesn't cause any performance penality. It does
> > even produce better result.
> > - the read/set/restore implementation gives worse performance.
> >
> > So I guess I will follow the path of regmap + cache page. What do you
> > think?
>
> I'm not seeing results with the "times" variable changed, but in
> general, I guess the "switch regmap + page" and "switch regmap + phy
> regmap" will remain neck and neck in terms of performance, surpassing
> the "switch regmap restore" techniques more and more as "times"
> increases. So going with a PHY regmap probably sounds good.

Could you find a way to reuse Maxime's mdio-regmap.c driver? Either
create separate regmaps for each PHY address, or make that driver
accept a configuration which isn't limited to a single ctx->valid_addr?