linux-kernel - Re[4]: [PATCH v3] mfd: syscon: Add non-DT support

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Date:	Tue, 19 Feb 2013 12:56:01 +0400
From:	Alexander Shiyan <shc_work@...l.ru>
To:	Dong Aisheng <dong.aisheng@...aro.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: Re[4]: [PATCH v3] mfd: syscon: Add non-DT support

...
> >> >>  struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
> >> >>  {
> >> >>       struct device_node *syscon_np;
> >> >>       struct regmap *regmap;
> >> >> +     struct syscon *syscon;
> >> >> +     struct device *dev;
> >> >>
> >> >>       syscon_np = of_find_compatible_node(NULL, NULL, s);
> >> >> -     if (!syscon_np)
> >> >> +     if (syscon_np) {
> >> >> +             regmap = syscon_node_to_regmap(syscon_np);
> >> >> +             of_node_put(syscon_np);
> >> >> +
> >> >> +             return regmap;
> >> >> +     }
> >> >> +
> >> >> +     /* Fallback to search by id_entry.name string */
> >> >> +     dev = driver_find_device(&syscon_driver.driver, NULL, (void *)s,
> >> >> +                              syscon_match_id);
> >> >> +     if (!dev)
> >> >>               return ERR_PTR(-ENODEV);
> >> >>
> >> >> -     regmap = syscon_node_to_regmap(syscon_np);
> >> >> -     of_node_put(syscon_np);
> >> >> +     syscon = dev_get_drvdata(dev);
> >> >>
> >> >> -     return regmap;
> >> >> +     return syscon->regmap;
> >> >>  }
> >> >>  EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);
> >> >
> >> > Since you are not actually comparing the "compatible" property here,
> >> > I would suggest adding another function here,
> >>
> >> Yes, i also think like that.
> >
> > In this case we should provide two paths for drivers which can work as with DT
> > and without DT.
> 
> Yes.

I still think the universal procedure is better for the driver.

> > In my case we can use platform_device_id.name field with
> > "compatible" string. My way in this case is transparency for driver which is
> > using "syscon".
> >
> 
> Yes, but it also brings misleading and mass.
> And i wonder even the API can cover the two type of matches, the
> caller still can't use
> the only one name for two cases since the name is different.
> So it looks to me not make too much sense to provide only one API.

The previous version of the patch keep conformity to the name of
procedure ("compatible" field in platform_data)...

So, now I'm totally confused what we do with the search function.

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