linux-kernel - Re: [PATCH] ARM: RX51: Set system

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Message-ID: <20160208211022.GM30075@pali>
Date:	Mon, 8 Feb 2016 22:10:22 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>, tony@...mide.com
Cc:	linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	arnd@...db.de
Subject: Re: [PATCH] ARM: RX51: Set system_rev from ATAGS

On Friday 05 February 2016 20:15:02 Ivaylo Dimitrov wrote:
> Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>

Reviewed-by: Pali Rohár <pali.rohar@...il.com>
Tested-by: Pali Rohár <pali.rohar@...il.com>

> ---
>  arch/arm/mach-omap2/board-generic.c | 22 +++++++++++++++++++++-
>  1 file changed, 21 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c
> index 8098272..b91fabe 100644
> --- a/arch/arm/mach-omap2/board-generic.c
> +++ b/arch/arm/mach-omap2/board-generic.c
> @@ -18,6 +18,7 @@
>  
>  #include <asm/setup.h>
>  #include <asm/mach/arch.h>
> +#include <asm/system_info.h>
>  
>  #include "common.h"
>  
> @@ -77,12 +78,31 @@ static const char *const n900_boards_compat[] __initconst = {
>  	NULL,
>  };
>  
> +/* Set system_rev from atags */
> +static void __init rx51_system_rev(const struct tag *tags)
> +{
> +	const struct tag *tag;
> +
> +	if (tags->hdr.tag != ATAG_CORE)
> +		return;
> +
> +	for_each_tag(tag, tags) {
> +		if (tag->hdr.tag == ATAG_REVISION) {
> +			system_rev = tag->u.revision.rev;
> +			break;
> +		}
> +	}
> +}
> +
>  /* Legacy userspace on Nokia N900 needs ATAGS exported in /proc/atags,
>   * save them while the data is still not overwritten
>   */
>  static void __init rx51_reserve(void)
>  {
> -	save_atags((const struct tag *)(PAGE_OFFSET + 0x100));
> +	const struct tag *tags = (const struct tag *)(PAGE_OFFSET + 0x100);
> +
> +	save_atags(tags);
> +	rx51_system_rev(tags);

Tony, if you are going to take this patch, I would suggest to rename
function name rx51_system_rev to rx51_set_system_rev as it says what
function do (set system rev :-)).

>  	omap_reserve();
>  }
>  

-- 
Pali Rohár
pali.rohar@...il.com