Re: [PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

Florian Fainelli
2014-12-10T18:47:40Z

2014-12-10 8:46 GMT-08:00 Scott Branden <sbranden@broadcom.com>:
> On 14-12-10 03:31 AM, Arnd Bergmann wrote:
>>
>> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>>>
>>> Add initial version of the Broadcom iProc PCIe driver. This driver
>>> has been tested on NSP and Cygnus and is expected to work on all iProc
>>> family of SoCs that deploys the same PCIe host controller
>>>
>>> The driver also supports MSI
>>>
>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>
>>
>> The driver looks suspiciously like the one that Hauke already submitted a
>> while ago for bcm53xx. Please come up with a merged driver that works for
>> both.
>
> Could you please be a little more specific. What driver did "Hauke already
> submitted"? I do not see any driver in the kernel you are talking about.

https://www.marc.info/?l=linux-pci&m=141547043110684&w=2

>>
>>
>> Are you sure that iProc isn't based on the BCMA bus infrastructure after
>> all? Even the physical address of your PCI host falls into the address
>> range that is used for the internal BCMA bus on the other chips!
>
> BCMA seems to be for MIPS architectures. It seems to be quite specific to
> those architectures using BCMA. I see no use of it in bcm53xx code?

BCMA lives in its own directory in drivers/bcma/ and is not specific
to MIPS actually. Older BCM47xx/BCM53xx MIPS-based SoCs traditionally
started with a discoverable Silicon Sonics Backplane (drivers/ssb) and
progressively migrated to BCMA (drivers/bcma), both subsystems offer a
very similar bus/device/driver abstraction and discovery mechanism.
--
Florian