linux-kernel - Re: [PATCH 3/7] i2c: Add the ability to match device to compatible string without an of

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Date:	Wed, 4 Jun 2014 18:55:52 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Rob Herring <robherring2@...il.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"wsa@...-dreams.de" <wsa@...-dreams.de>,
	Grant Likely <grant.likely@...aro.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 3/7] i2c: Add the ability to match device to compatible
 string without an of_node

On Wed, 04 Jun 2014, Rob Herring wrote:

> On Wed, Jun 4, 2014 at 7:09 AM, Lee Jones <lee.jones@...aro.org> wrote:
> > A great deal of I2C devices are currently matched via DT node name, and
> > as such the compatible naming convention of '<vendor>,<device>' has gone
> > somewhat awry - some nodes don't supply one, some supply an arbitrary
> > string and others the correct device name with an arbitrary vendor prefix.
> >
> > In an effort to correct this problem we have to supply a mechanism to
> > match a device by compatible string AND by simple device name.  This
> > function strips off the '<vendor>,' part of a supplied compatible string
> > and attempts to match without it.
> >
> > The plan is to remove this function once all of the compatible strings
> > for each device have been brought into line.
> 
> Then should you add a warning for cases needing to be fixed?

I was just going to go and fix them all, but I could do that as well?

> > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> > ---
> >  drivers/i2c/i2c-core.c | 25 +++++++++++++++++++++++++
> >  include/linux/i2c.h    | 10 ++++++++++
> >  2 files changed, 35 insertions(+)
> >
> > diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> > index d3802dc..7dcd5c3 100644
> > --- a/drivers/i2c/i2c-core.c
> > +++ b/drivers/i2c/i2c-core.c
> > @@ -1090,6 +1090,31 @@ struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
> >         return i2c_verify_adapter(dev);
> >  }
> >  EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
> > +
> > +const struct of_device_id
> > +*i2c_of_match_device_strip_vendor(const struct of_device_id *matches,
> > +                                 struct device *dev)
> > +{
> > +       const struct i2c_client *client = i2c_verify_client(dev);
> > +       const char *name;
> > +
> > +       if (!(client && matches))
> > +               return NULL;
> > +
> > +       for (; matches->compatible[0]; matches++) {
> > +               name = strchr(matches->compatible, ',');
> > +               if (!name)
> > +                       name = matches->compatible;
> > +               else
> > +                       name++;
> > +
> > +               if (!strncmp(client->name, name, strlen(client->name)))
> > +                       return matches;
> > +       }
> > +
> > +       return NULL;
> > +}
> > +EXPORT_SYMBOL_GPL(i2c_of_match_device_strip_vendor);
> >  #else
> >  static void of_i2c_register_devices(struct i2c_adapter *adap) { }
> >  #endif /* CONFIG_OF */
> > diff --git a/include/linux/i2c.h b/include/linux/i2c.h
> > index b556e0a..f7ec75b 100644
> > --- a/include/linux/i2c.h
> > +++ b/include/linux/i2c.h
> > @@ -564,6 +564,9 @@ extern struct i2c_client *of_find_i2c_device_by_node(struct device_node *node);
> >  /* must call put_device() when done with returned i2c_adapter device */
> >  extern struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node);
> >
> > +extern const struct of_device_id
> > +*i2c_of_match_device_strip_vendor(const struct of_device_id *matches,
> > +                                 struct device *dev);
> >  #else
> >
> >  static inline struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
> > @@ -575,6 +578,13 @@ static inline struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node
> >  {
> >         return NULL;
> >  }
> > +
> > +const struct of_device_id
> > +*i2c_of_match_device_strip_vendor(const struct of_device_id *matches,
> > +                                 struct device *dev)
> > +{
> > +       return NULL;
> > +}
> >  #endif /* CONFIG_OF */
> >
> >  #endif /* _LINUX_I2C_H */
> >

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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