linux-kernel - RE: [PATCH 4/4] OF: introduce OF style 'modalias' support for platform bus.

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Date:	Thu, 16 Jan 2014 07:04:19 +0000
From:	"Zhang, Rui" <rui.zhang@...el.com>
To:	Rob Herring <robherring2@...il.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
	"wsa@...-dreams.de" <wsa@...-dreams.de>,
	Mark Brown <broonie@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	Grant Likely <grant.likely@...aro.org>,
	"Rob Herring" <rob.herring@...xeda.com>,
	"jarkko.nikula@...ux.intel.com" <jarkko.nikula@...ux.intel.com>,
	"mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH 4/4] OF: introduce OF style 'modalias' support for
 platform bus.



> -----Original Message-----
> From: Rob Herring [mailto:robherring2@...il.com]
> Sent: Wednesday, January 15, 2014 9:45 PM
> To: Zhang, Rui
> Cc: linux-kernel@...r.kernel.org; linux-acpi@...r.kernel.org; linux-
> i2c@...r.kernel.org; linux-spi@...r.kernel.org; wsa@...-dreams.de; Mark
> Brown; Greg Kroah-Hartman; Wysocki, Rafael J; Grant Likely; Rob Herring;
> jarkko.nikula@...ux.intel.com; mika.westerberg@...ux.intel.com;
> devicetree@...r.kernel.org
> Subject: Re: [PATCH 4/4] OF: introduce OF style 'modalias' support for
> platform bus.
> Importance: High
> 
> On Tue, Jan 14, 2014 at 2:46 AM, Zhang Rui <rui.zhang@...el.com> wrote:
> > Fix a problem that, the platform bus supports the OF style modalias
> in
> > .uevent() call, but not in its device 'modalias' sysfs attribute.
> >
> > cc: devicetree@...r.kernel.org
> > Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> 
> Acked-by: Rob Herring <robh@...nel.org>
> 
> As there doesn't appear any dependency with the rest of this series, I
> can take this.
> 
Thanks.

-rui
> One minor nit below.
> 
> > ---
> >  drivers/base/platform.c   |    4 ++++
> >  drivers/of/device.c       |    3 +++
> >  include/linux/of_device.h |    6 ++++++
> >  3 files changed, 13 insertions(+)
> >
> > diff --git a/drivers/base/platform.c b/drivers/base/platform.c index
> > 2f4aea2..bc78848 100644
> > --- a/drivers/base/platform.c
> > +++ b/drivers/base/platform.c
> > @@ -679,6 +679,10 @@ static ssize_t modalias_show(struct device *dev,
> struct device_attribute *a,
> >         struct platform_device  *pdev = to_platform_device(dev);
> >         int len;
> >
> > +       len = of_device_get_modalias(dev, buf, PAGE_SIZE -1);
> > +       if (len != -ENODEV)
> > +               return len;
> > +
> >         len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
> >         if (len != -ENODEV)
> >                 return len;
> > diff --git a/drivers/of/device.c b/drivers/of/device.c index
> > f685e55..dafb973 100644
> > --- a/drivers/of/device.c
> > +++ b/drivers/of/device.c
> > @@ -85,6 +85,9 @@ ssize_t of_device_get_modalias(struct device *dev,
> char *str, ssize_t len)
> >         int cplen, i;
> >         ssize_t tsize, csize, repend;
> >
> > +       if ((!dev) || (!dev->of_node))\
> 
> Don't need the parentheses here.
> 
> > +               return -ENODEV;
> > +
> >         /* Name & Type */
> >         csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
> >                          dev->of_node->type); diff --git
> > a/include/linux/of_device.h b/include/linux/of_device.h index
> > 82ce324..8d7dd67 100644
> > --- a/include/linux/of_device.h
> > +++ b/include/linux/of_device.h
> > @@ -64,6 +64,12 @@ static inline int of_driver_match_device(struct
> > device *dev,  static inline void of_device_uevent(struct device *dev,
> >                         struct kobj_uevent_env *env) { }
> >
> > +static inline int of_device_get_modalias(struct device *dev,
> > +                                  char *str, ssize_t len) {
> > +       return -ENODEV;
> > +}
> > +
> >  static inline int of_device_uevent_modalias(struct device *dev,
> >                                    struct kobj_uevent_env *env)  {
> > --
> > 1.7.9.5
> >
> > --
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