linux-kernel - Re: [PATCH] arm64/sunxi: 4.6-rc1: Add dependency on generic irq chip

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Date:	Wed, 13 Apr 2016 10:05:40 +0100
From:	Suzuki K Poulose <Suzuki.Poulose@....com>
To:	Olof Johansson <olof@...om.net>, andre.przywara@....com
Cc:	linux-arm-kernel@...ts.infradead.org, arm@...nel.org,
	arnd@...db.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64/sunxi: 4.6-rc1: Add dependency on generic irq chip

On 12/04/16 20:11, Olof Johansson wrote:
> On Tue, Mar 29, 2016 at 11:03:06AM +0100, Suzuki K Poulose wrote:
>> Commit ce3dd55b99b1 ("arm64: Introduce Allwinner SoC config option"),
>> added support for ARCH_SUNXI on arm64, but failed to select
>> GENERIC_IRQ_CHIP, which is required for drivers/irqchip/irq-sunxi-nmi.c
>> and causes build failures like :
>>
>>    UPD     include/generated/compile.h
>>    CC      init/version.o
>>    LD      init/built-in.o
>> drivers/built-in.o: In function `sunxi_sc_nmi_set_type':
>> drivers/irqchip/irq-sunxi-nmi.c:114: undefined reference to `irq_setup_alt_chip'
>> drivers/built-in.o: In function `irq_domain_add_linear':
>> include/linux/irqdomain.h:253: undefined reference to `irq_generic_chip_ops'
>> include/linux/irqdomain.h:253: undefined reference to `irq_generic_chip_ops'
>> drivers/built-in.o: In function `sunxi_sc_nmi_irq_init':
>> drivers/irqchip/irq-sunxi-nmi.c:146: undefined reference to `irq_alloc_domain_generic_chips'
>> drivers/irqchip/irq-sunxi-nmi.c:161: undefined reference to `irq_get_domain_generic_chip'
>> drivers/irqchip/irq-sunxi-nmi.c:170: undefined reference to `irq_gc_mask_clr_bit'
>> drivers/irqchip/irq-sunxi-nmi.c:171: undefined reference to `irq_gc_mask_set_bit'
>> drivers/irqchip/irq-sunxi-nmi.c:172: undefined reference to `irq_gc_ack_set_bit'
>> drivers/irqchip/irq-sunxi-nmi.c:170: undefined reference to `irq_gc_mask_clr_bit'
>>
>> Fixes: commit ce3dd55b99b1 ("arm64: Introduce Allwinner SoC config option")
>> Cc: Andre Przywara <andre.przywara@....com>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
>
> It'd be nice to have a silent Kconfig entry that selects from ARCH_SUNXI that
> sets this dependency, instead of having it from the architecture code. This
> pushes down the dependency to the right level.

Do you mean something like :
config ARCH_SUNXI
  	...
	select SUNXI_PLATFORM

And have

config SUNXI_PLATFORM
	select SUNXI_DEPENDENCY_1
	select SUNXI_DEPENDENCY_2

where SUNXI_PLATFORM drives the dependencies for both ARM and ARM64 ?

If so, where would you like SUNXI_PLATFORM to reside ? drivers/platform ?
Also, AFAIK, the arm64 port doesn't have the full support for the required
bits for SUNXI yet, which could be handled in the common place with ( && !ARM64).

Andre, please feel free to correct my assessment above.


Thanks
Suzuki