Re: [PATCH v2 03/18] PCI: designware: Configuration space should be specified in 'reg'

[Liviu Dudau]

On Thu, May 29, 2014 at 10:03:54AM -0500, Kumar Gala wrote:
> 
> On May 29, 2014, at 1:38 AM, Kishon Vijay Abraham I <kishon@xxxxxx> wrote:
> 
> > The configuration address space has so far been specified in *ranges*,
> > however it should be specified in *reg* making it a platform MEM resource.
> > Hence used 'platform_get_resource_*' API to get configuration address
> > space in the designware driver.
> > 
> > Cc: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>
> > Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> > Cc: Mohit Kumar <mohit.kumar@xxxxxx>
> > Cc: Jingoo Han <jg1.han@xxxxxxxxxxx>
> > Cc: Marek Vasut <marex@xxxxxxx>
> > Cc: Arnd Bergmann <arnd@xxxxxxxx>
> > Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
> > ---
> > .../devicetree/bindings/pci/designware-pcie.txt    |    1 +
> > drivers/pci/host/pcie-designware.c                 |   17 +++++++++++++++--
> > 2 files changed, 16 insertions(+), 2 deletions(-)
> 
> Why should the cfg space be defined in *reg* instead of ranges?

Because what you end up using is a struct resource to represent the cfg space and
the conversion between ranges and resources breaks down for CFG space (we don't
have a flag in the resource flags to say this is CFG resource). Specifying it
as a *reg* property makes it a MEM resource and no special casing is needed.

Best regards,
Liviu

> 
> - k
> 
> -- 
> Employee of Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

-- 
-------------------
   .oooO
   (   )
    \ (  Oooo.
     \_) (   )
          ) /
         (_/

 One small step
   for me ...

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/