Re: [PATCH v3 2/3] mmc: dw_mmc-rockchip: Add v2 tuning support

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Am Donnerstag, 15. August 2024, 02:55:37 CEST schrieb Shawn Lin:
> Hi Detlev
> 
> 在 2024/8/15 6:34, Detlev Casanova 写道:
> > From: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
> > 
> > v2 tuning will inherit pre-stage loader's phase settings for the first
> > time, and do re-tune if necessary.
> > Re-tune will still try the rough degrees, for instance, 90, 180, 270,
> > 360 but continue to do the fine tuning if sample window isn't good
> > enough.
> > 
> > Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
> > Signed-off-by: Detlev Casanova <detlev.casanova@xxxxxxxxxxxxx>

> > @@ -277,6 +322,10 @@ static int dw_mci_rk3288_parse_dt(struct dw_mci *host)
> >   					&priv->default_sample_phase))
> >   		priv->default_sample_phase = 0;
> >   
> > +	priv->use_v2_tuning =
> > +		of_device_is_compatible(host->dev->of_node,
> > +					"rockchip,rk3576-dw-mshc");
> > +
> 
> v2 is a kind of software decision instead of hardware dependency.
> So in theory, any SoC can claim to use it via DT.

which actually makes it unsuitable for dt.

Devicetree describes hardware-properties and should _not_ be used for
software configuration.


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