linux-kernel - Re: [PATCH] bcma: Kconfig: Let it depend on PCI

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Date:	Wed, 4 Mar 2015 13:08:49 +0100
From:	Rafał Miłecki <zajec5@...il.com>
To:	Chen Gang <xili_gchen_5257@...mail.com>
Cc:	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	b43-dev <b43-dev@...ts.infradead.org>,
	Hauke Mehrtens <hauke@...ke-m.de>,
	Michael Büsch <m@...s.ch>,
	Larry Finger <Larry.Finger@...inger.net>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] bcma: Kconfig: Let it depend on PCI

On 4 March 2015 at 07:19, Rafał Miłecki <zajec5@...il.com> wrote:
> On 3 March 2015 at 22:16, Chen Gang <xili_gchen_5257@...mail.com> wrote:
>> bcma also needs PCI, just like IOMEM and DMA, so let it depend on PCI,
>> or will cause building break for allmodconfig under c6x:
>>
>>     CC [M]  drivers/bcma/driver_pcie2.o
>>   drivers/bcma/driver_pcie2.c: In function 'bcma_core_pcie2_up':
>>   drivers/bcma/driver_pcie2.c:196:8: error: implicit declaration of function 'pcie_set_readrq' [-Werror=implicit-function-declaration]
>>     err = pcie_set_readrq(dev, pcie2->reqsize);
>>           ^
>>
>> Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
>> ---
>>  drivers/bcma/Kconfig | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/bcma/Kconfig b/drivers/bcma/Kconfig
>> index 0ee48be..8be284e 100644
>> --- a/drivers/bcma/Kconfig
>> +++ b/drivers/bcma/Kconfig
>> @@ -1,6 +1,6 @@
>>  config BCMA_POSSIBLE
>>         bool
>> -       depends on HAS_IOMEM && HAS_DMA
>> +       depends on HAS_IOMEM && HAS_DMA && PCI
>>         default y
>>
>>  menu "Broadcom specific AMBA"
>> --
>> 1.9.3
>
> Hm, I'm not sure how to ideally handle this. Cc-ing few ppl, maybe
> they have something to add.
>
> In fact there are SoCs (not using PCI host code obviously) with
> everything embedded (without any PCI host mode cores). So note
> following info about driver_pci.c and driver_pcie2.c:
> 1) For BCMA_HOST_PCI
> They are required, because of needed host-related PCI(e) core initialization.
> 2) For BCMA_HOST_SOC
> They are needed only if your SoC has PCI(e) host cores and you want to use them.
>
> So I guess in theory we could have BCMA_DRIVER_PCI and *require* it
> for BCMA_HOST_PCI only.

After thinking about this.
We already have Kconfig entries for other internal drivers, so I guess
it makes sense to do the same for PCIe.

-- 
Rafał
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