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

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Message-Id: <20100806014351.a3bddf08.sfr@canb.auug.org.au>
Date:	Fri, 6 Aug 2010 01:43:51 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	gregkh@...e.de, 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

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

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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