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Date:   Mon, 17 Feb 2020 15:59:17 +0100
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Vitor Soares <Vitor.Soares@...opsys.com>
Cc:     linux-kernel@...r.kernel.org, linux-i3c@...ts.infradead.org,
        Joao.Pinto@...opsys.com, Jose.Abreu@...opsys.com,
        bbrezillon@...nel.org, gregkh@...uxfoundation.org,
        wsa@...-dreams.de, arnd@...db.de, broonie@...nel.org
Subject: Re: [RFC v2 1/4] i3c: master: export i3c_masterdev_type

On Mon, 17 Feb 2020 15:56:23 +0100
Boris Brezillon <boris.brezillon@...labora.com> wrote:

> On Wed, 29 Jan 2020 13:17:32 +0100
> Vitor Soares <Vitor.Soares@...opsys.com> wrote:
> 
> > Exporte i3c_masterdev_type so i3cdev module can verify if an i3c device
> > is a master.
> > 
> > Signed-off-by: Vitor Soares <vitor.soares@...opsys.com>
> > ---
> >  drivers/i3c/internals.h | 1 +
> >  drivers/i3c/master.c    | 3 ++-
> >  2 files changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/i3c/internals.h b/drivers/i3c/internals.h
> > index 86b7b44..bc062e8 100644
> > --- a/drivers/i3c/internals.h
> > +++ b/drivers/i3c/internals.h
> > @@ -11,6 +11,7 @@
> >  #include <linux/i3c/master.h>
> >  
> >  extern struct bus_type i3c_bus_type;
> > +extern const struct device_type i3c_masterdev_type;
> >  
> >  void i3c_bus_normaluse_lock(struct i3c_bus *bus);
> >  void i3c_bus_normaluse_unlock(struct i3c_bus *bus);
> > diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
> > index 7f8f896..8a0ba34 100644
> > --- a/drivers/i3c/master.c
> > +++ b/drivers/i3c/master.c
> > @@ -523,9 +523,10 @@ static void i3c_masterdev_release(struct device *dev)
> >  	of_node_put(dev->of_node);
> >  }
> >  
> > -static const struct device_type i3c_masterdev_type = {
> > +const struct device_type i3c_masterdev_type = {
> >  	.groups	= i3c_masterdev_groups,
> >  };
> > +EXPORT_SYMBOL_GPL(i3c_masterdev_type);  
> 
> No need to export the symbol, removing the static and adding the
> definition to internal.h should work just fine (i3c.o contains
> both master.o and device.o).

Hm, my bad. Looks like i3cdev is a separate module/driver. If that's
the case, it should not have direct access to internals.h. I see 2
options here:

1/ make the i3cdev logic part of the core
2/ provide helpers to find devices by type

But maybe none of that is needed if you let userspace bind i3c devices
to the i3cdev driver.

> 
> >  
> >  static int i3c_bus_set_mode(struct i3c_bus *i3cbus, enum i3c_bus_mode mode,
> >  			    unsigned long max_i2c_scl_rate)  
> 

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