[PATCH] arm: mvebu: fix coherency_late_init() for multiplatform

[andrew@lunn.ch (Andrew Lunn)]

On Thu, Jun 20, 2013 at 09:45:26AM +0200, Thomas Petazzoni wrote:
> As noticed by Arnaud Patard (Rtp) <arnaud.patard@rtp-net.org>, commit
> 865e0527d2d7 ('arm: mvebu: avoid hardcoded virtual address in
> coherency code') added a postcore_initcall() to register the bus
> notifier that the mvebu code needs to apply correct DMA operations on
> its platform devices breaks the multiplatform boot on other platforms,
> because the bus notifier registration is unconditional.
> 
> This commit fixes that by registering the bus notifier only if we have
> the mvebu coherency unit described in the Device Tree. The conditional
> used is exactly the same in which the bus_register_notifier() call was
> originally enclosed before 865e0527d2d7 ('arm: mvebu: avoid hardcoded
> virtual address in coherency code').
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> Reported-by: Arnaud Patard (Rtp) <arnaud.patard@rtp-net.org>
> ---
> This fix has been reported by Arnaud to fix the boot on his OMAP4
> PandaBoard, and it continues to work well on Marvell Armada XP GP.
> 
> This commit is based on jcooper/mvebu/regmap.
> ---
>  arch/arm/mach-mvebu/coherency.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/mach-mvebu/coherency.c b/arch/arm/mach-mvebu/coherency.c
> index 32fcf69..be11759 100644
> --- a/arch/arm/mach-mvebu/coherency.c
> +++ b/arch/arm/mach-mvebu/coherency.c
> @@ -147,8 +147,9 @@ int __init coherency_init(void)
>  
>  static int __init coherency_late_init(void)
>  {
> -	bus_register_notifier(&platform_bus_type,
> -			      &mvebu_hwcc_platform_nb);
> +	if (of_find_matching_node(NULL, of_coherency_table))
> +		bus_register_notifier(&platform_bus_type,
> +				      &mvebu_hwcc_platform_nb);
>  	return 0;
>  }
>  
> -- 
> 1.8.1.2
> 

Acked-by: Andrew Lunn <andrew@lunn.ch>

	  Andrew