linux-kernel - Re: [PATCH] pci: iproc: fix PCIE

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Date:	Tue, 24 Mar 2015 23:26:32 -0700
From:	Ray Jui <rjui@...adcom.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	Scott Branden <sbranden@...adcom.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	<bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH] pci: iproc: fix PCIE_IPROC in Kconfig

Hi Bjorn,

On 3/24/2015 5:28 PM, Bjorn Helgaas wrote:
> On Tue, Mar 24, 2015 at 12:33 AM, Ray Jui <rjui@...adcom.com> wrote:
>> Make PCIE_IPROC depending on both OF and ARM and default to be disabled,
>> so it cannot be accidentally enabled by other platforms
>>
>> PCIE_IPROC is meant to be enabled by a front-end bus driver. Curenntly
>> it's enabled by PCIE_IPROC_PLTFM driver
>>
>> Signed-off-by: Ray Jui <rjui@...adcom.com>
>> 
>>  drivers/pci/host/Kconfig |    2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
>> index feccd0d..963b507 100644
>> --- a/drivers/pci/host/Kconfig
>> +++ b/drivers/pci/host/Kconfig
>> @@ -108,6 +108,8 @@ config PCI_VERSATILE
>>
>>  config PCIE_IPROC
>>         tristate "Broadcom iProc PCIe controller"
>> +       depends on OF && ARM
>> +       default n
>>         help
>>           This enables the iProc PCIe core controller support for Broadcom's
>>           iProc family of SoCs. An appropriate bus interface driver also needs
> 
> What pattern are you following?  There must be other drivers with
> similar front-end bus driver schemes, and I'd rather copy their
> Kconfig descriptions than invent something new.

I'm not aware of other drivers using a similar model to support
different front-end bus interfaces. Note this is requested by Arnd
Bergmann to support a normal platform bus interface and a BCMA bus
interface, which is quite unique.

PCIE_DW may be close in a way in terms of how the core code are retained
in PCIE_DW driver with PCI_EXYNOS, PCI_IMX6, and etc. to take care of
SoC specific things.

Note PCIE_DW currently has no Kconfig descriptions.

> 
> With CONFIG_PCIE_IPROC_PLTFM, can we spell out "PLATFORM"?  Doesn't
> seem like there's anything to gain by abbreviating it.

Sure. I'll submit a new patch series, which will contain this patch, and
another patch on top, to change from CONFIG_PCIE_IPROC_PLTFM to
CONFIG_PCIE_IPROC_PLATFORM.

> 
> Bjorn
> 

Thanks,

Ray
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