linux-kernel - Re: [PATCH 1/3] driver core: Add ability for arch code to setup pdev

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Message-ID: <20100805180211.GA12687@suse.de>
Date:	Thu, 5 Aug 2010 11:02:11 -0700
From:	Greg KH <gregkh@...e.de>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Kumar Gala <galak@...nel.crashing.org>, linuxppc-dev@...abs.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] driver core: Add ability for arch code to setup
 pdev_archdata

On Fri, Aug 06, 2010 at 01:43:51AM +1000, Stephen Rothwell wrote:
> Hi Kumar,
> 
> On Thu,  5 Aug 2010 10:15:45 -0500 Kumar Gala <galak@...nel.crashing.org> wrote:
> >
> > --- a/drivers/base/platform.c
> > +++ b/drivers/base/platform.c
> > @@ -19,6 +19,7 @@
> >  #include <linux/err.h>
> >  #include <linux/slab.h>
> >  #include <linux/pm_runtime.h>
> > +#include <asm/platform_device.h>
> >  
> >  #include "base.h"
> >  
> > @@ -170,6 +171,9 @@ struct platform_device *platform_device_alloc(const char *name, int id)
> >  		pa->pdev.id = id;
> >  		device_initialize(&pa->pdev.dev);
> >  		pa->pdev.dev.release = platform_device_release;
> > +#ifdef ARCH_HAS_PDEV_ARCHDATA_SETUP
> > +		arch_setup_pdev_archdata(&pa->pdev);
> > +#endif
> >  	}
> >  
> >  	return pa ? &pa->pdev : NULL;
> > diff --git a/include/asm-generic/platform_device.h b/include/asm-generic/platform_device.h
> > new file mode 100644
> > index 0000000..64806dc
> > --- /dev/null
> > +++ b/include/asm-generic/platform_device.h
> > @@ -0,0 +1,7 @@
> > +#ifndef __ASM_GENERIC_PLATFORM_DEVICE_H_
> > +#define __ASM_GENERIC_PLATFORM_DEVICE_H_
> > +/*
> > + * an architecture can override to define arch_setup_pdev_archdata
> > + */
> > +
> > +#endif /* __ASM_GENERIC_PLATFORM_DEVICE_H_ */
> 
> Why not do:
> 
> #include <linux/platform_device.h>
> 
> #ifndef arch_setup_pdev_archdata
> static inline void arch_setup_pdev_archdata(struct platform_device *pdev) { }
> #endif
> 
> in asm-generic/platform-device.h
> 
> and the the call in platform_device_alloc() can be unconditional.  If the arch wants to override arch_setup_pdev_archdata, it defines the function and then does
> 
> #define arch_setup_pdev_archdata arch_setup_pdev_archdata
> 
> before still including asm-generic/platform_device.h

Yes, I'd prefer that method as well.

thanks,

greg k-h
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