linux-kernel - Re: [PATCH 1/2] mmc: omap_hsmmc: Add support for slot-name property in DT

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Message-ID: <20150518150607.GD10274@atomide.com>
Date:	Mon, 18 May 2015 08:06:07 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Pali Rohár <pali.rohar@...il.com>,
	Benoît Cousson <bcousson@...libre.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: Re: [PATCH 1/2] mmc: omap_hsmmc: Add support for slot-name property
 in DT

* Arnd Bergmann <arnd@...db.de> [150515 14:26]:
> On Friday 15 May 2015 23:22:37 Pali Rohár wrote:
> > On Friday 15 May 2015 23:19:44 Arnd Bergmann wrote:
> > > On Friday 15 May 2015 23:14:48 Pali Rohár wrote:
> > > > diff --git a/drivers/mmc/host/omap_hsmmc.c
> > > > b/drivers/mmc/host/omap_hsmmc.c index 9df2b68..f6073dd 100644
> > > > --- a/drivers/mmc/host/omap_hsmmc.c
> > > > +++ b/drivers/mmc/host/omap_hsmmc.c
> > > > @@ -1901,6 +1901,8 @@ static struct omap_hsmmc_platform_data
> > > > *of_get_hsmmc_pdata(struct device *dev)
> > > > 
> > > >         if (of_find_property(np, "ti,needs-special-hs-handling",
> > > >         NULL))
> > > >         
> > > >                 pdata->features |= HSMMC_HAS_HSPE_SUPPORT;
> > > > 
> > > > +       of_property_read_string(np, "slot-name", &pdata->name);
> > > > +
> > > > 
> > > >         return pdata;
> > > >  
> > > >  }
> > > 
> > > This property needs to be documented in
> > > Documentation/devicetree/bindings/mmc/mmc.txt and preferably the
> > > implementation moved into mmc_of_parse.
> > > 
> > > We should not have an interface like this specific to one driver.
> > > 
> > >       Arnd
> > 
> > Interface is already present for platform data code (which do not use 
> > DT). So "pdata->name" is not DT specific...
> > 
> 
> The driver can of course keep providing the name from platform_data where
> that is used. All I was saying is that when you introduce a DT property,
> it should not be specific to that driver.

Yes sounds like it would be a usable generic binding. Not sure
that it should be called slot-name though, maybe you can use
the MMC driver instance name instead? I don't think much any drivers
support multiple MMC slots although it's in the original MMC spec.

If setting up the generic binding is expected to take a while,
you can naturally pass it in pdata while waiting for the generic
binding to get merged.

Regards,

Tony
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