Re: [PATCH] pinctrl: single: Fix PIN_CONFIG_BIAS_DISABLE handling

[Tony Lindgren <tony@atomide.com>]

* Linus Walleij <linus.walleij@linaro.org> [240328 21:02]:
> On Tue, Mar 19, 2024 at 12:07 PM Matthijs Kooijman <matthijs@stdin.nl> wrote:
> 
> > The pinctrl-single driver handles pin_config_set by looking up the
> > requested setting in a DT-defined lookup table, which defines what bits
> > correspond to each setting. There is no way to add
> > PIN_CONFIG_BIAS_DISABLE entries to the table, since there is instead
> > code to disable the bias by applying the disable values of both the
> > pullup and pulldown entries in the table.
> >
> > However, this code is inside the table-lookup loop, so it would only
> > execute if there is an entry for PIN_CONFIG_BIAS_DISABLE in the table,
> > which can never exist, so this code never runs.
> >
> > This commit lifts the offending code out of the loop, so it just
> > executes directly whenever PIN_CONFIG_BIAS_DISABLE is requested,
> > skippipng the table lookup loop.
> >
> > This also introduces a new `param` variable to make the code slightly
> > more readable.
> >
> > This bug seems to have existed when this code was first merged in commit
> > 9dddb4df90d13 ("pinctrl: single: support generic pinconf"). Earlier
> > versions of this patch did have an entry for PIN_CONFIG_BIAS_DISABLE in
> > the lookup table, but that was removed, which is probably how this bug
> > was introduced.
> >
> > Signed-off-by: Matthijs Kooijman <matthijs@stdin.nl>
> 
> This looks reasonable to me, but I need Tony to review it before applying.

Looks good to me:

Reviewed-by: Tony Lindgren <tony@atomide.com>