[PATCH V4 2/5] ARM: bcm2835: add interrupt controller driver

[Arnd Bergmann]

On Friday 14 September 2012, Stephen Warren wrote:
> 
> From: Simon Arlott <simon at fire.lp0.eu>
> 
> The BCM2835 contains a custom interrupt controller, which supports 72
> interrupt sources using a 2-level register scheme. The interrupt
> controller, or the HW block containing it, is referred to occasionally
> as "armctrl" in the SoC documentation, hence the symbol naming in the
> code.
> 
> This patch was extracted from git://github.com/lp0/linux.git branch
> rpi-split as of 2012/09/08, and modified as follows:
> 
> * s/bcm2708/bcm2835/.
> * Modified device tree vendor prefix.
> * Moved implementation to drivers/irchip/.
> * Added devicetree documentation, and hence removed list of IRQs from
>   bcm2835.dtsi.
> * Changed shift in MAKE_HWIRQ() and HWIRQ_BANK() from 8 to 5 to reduce
>   the size of the hwirq space, and pass the total size of the hwirq space
>   to irq_domain_add_linear(), rather than just the number of valid hwirqs;
>   the two are different due to the hwirq space being sparse.
> * Added the interrupt controller DT node to the top-level of the DT,
>   rather than nesting it inside a /axi node. Hence, changed the reg value
>   since /axi had a ranges property. This seems simpler to me, but I'm not
>   sure if everyone will like this change or not.
> * Don't set struct irq_domain_ops.map = irq_domain_simple_map, hence
>   removing the need to patch include/linux/irqdomain.h or
>   kernel/irq/irqdomain.c.
> * Simplified armctrl_of_init() using of_iomap().
> * Removed unused IS_VALID_BANK()/IS_VALID_IRQ() macros.
> * Renamed armctrl_handle_irq() to prevent possible symbol clashes.
> * Made armctrl_of_init() static.
> * Removed comment "Each bank is registered as a separate interrupt
>   controller" since this is no longer true.
> * Removed FSF address from license header.
> * Added my name to copyright header.
> 
> Signed-off-by: Chris Boot <bootc at bootc.net>
> Signed-off-by: Simon Arlott <simon at fire.lp0.eu>
> Signed-off-by: Dom Cobley <popcornmix at gmail.com>
> Signed-off-by: Dom Cobley <dc4 at broadcom.com>
> Signed-off-by: Stephen Warren <swarren at wwwdotorg.org>

Acked-by: Arnd Bergmann <arnd at arndb.de>