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

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Message-ID: <CAL_JsqJOEipHyjD2NCjQd1BvLumnM3PkVDqUjrMNfXCOmXcNAA@mail.gmail.com>
Date:	Wed, 4 Jun 2014 12:29:29 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Lee Jones <lee.jones@...aro.org>
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, 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?

Rob

>
> 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 */
> --
> 1.8.3.2
>
> --
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