linux-kernel - Re: [PATCH 01/32] arm64: Add platform selection for BCM2835.

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Date:	Thu, 2 Jun 2016 09:25:17 -0700
From:	Ray Jui <ray.jui@...adcom.com>
To:	Gerd Hoffmann <kraxel@...hat.com>,
	Florian Fainelli <f.fainelli@...il.com>
Cc:	linux-rpi-kernel@...ts.infradead.org,
	Eric Anholt <eric@...olt.net>, Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Russell King <linux@...linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"open list:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..." 
	<bcm-kernel-feedback-list@...adcom.com>,
	"moderated list:ARM SUB-ARCHITECTURES" 
	<linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/32] arm64: Add platform selection for BCM2835.



On 6/1/2016 11:45 PM, Gerd Hoffmann wrote:
>>>  config ARCH_BCM2835
>>>  	bool "Broadcom BCM2835 family"
>>> -	depends on ARCH_MULTI_V6 || ARCH_MULTI_V7
>>> +	depends on ARCH_MULTI_V6 || ARCH_MULTI_V7 || ARM64
>>
>> Humm, what does that achieve?
>
> Nothing ;)
>
> Slipped through unnoticed, I'll drop it.
>
>>> +config ARCH_BCM
>>> +	bool "Broadcom SoC Support"
>>> +	help
>>> +	  This enables support for Broadcom ARM based SoC chips
>>
>> menuconfig maybe?
>
> There isn't any in arch/arm64/Kconfig.platforms right now, so I didn't
> feel like introducing one.  Also the dependency should have pretty much
> the same effect ...
>
>>> +config ARCH_BCM2835
>>> +	bool "Broadcom BCM2835 family"
>>> +	depends on ARCH_BCM
>>> +	select ARCH_REQUIRE_GPIOLIB
>>> +	select CLKSRC_OF
>>> +	select PINCTRL
>>> +	select PINCTRL_BCM2835
>>> +	select ARM_AMBA
>>> +	select ARM_TIMER_SP804
>>> +	select HAVE_ARM_ARCH_TIMER
>>> +	help
>>> +	  This enables support for the Broadcom BCM2837 SoC.
>>> +	  This SoC is used in the Raspberry Pi 3 device.
>>> +
>>>  config ARCH_BCM_IPROC
>>>  	bool "Broadcom iProc SoC Family"
>>> +	depends on ARCH_BCM
>>
>> Does not seem necessary nor adding anything here.
>
> Added for consistency.  When we add ARCH_BCM all ARCH_BCM_* should
> depend on it ...
>
> We could also do it the other way around: make ARCH_BCM a hidden bool
> and have ARCH_BCM_* select it.

Yes, this is probably better.

ARCH_BCM_IPROC is currently enabled in arch/arm64/configs/defconfig. By 
adding a dependency here without enabling ARCH_BCM in arm64 defconfig, 
this effectively disables ARCH_BCM_IPROC from arm64 defconfig.

>
> cheers,
>   Gerd
>