Re: [Xen-devel] [PATCH v6 5/6] xen: arm: Import of_bus PCI entry from Linux (as a dt_bus entry)

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Ian,

On 03/07/15 16:56, Ian Campbell wrote:
> This provides specific handlers for the PCI bus relating to matching
> and translating. It's mostly similar to the defaults but includes some
> additional error checks and other PCI specific bits.
> 
> There are some subtle differences in how the generic code vs. the pci
> specific code here will handle buggy DTs (i.e. #*-cells which are not
> as required by the pci bindings). This will mean we tolerate such
> device trees better.
> 
> I say "buggy", but actually it's not clear to me from reading "PCI Bus
> Binding to Open Firmware" that when the device_type is "pci" that
> e.g. the text says "The value of "#address-cells" for PCI Bus Nodes is
> 3." and not "A PCI Bus Node must contain a #address-cells property
> containing 3", iow the #address-cells might validly be implicit rather
> than an actual property. Maybe that interpretation is bogus, but with
> this patch we are are able to cope with DTs written by people who do
> read it like that.
> 
> It also gets us the ability to parse the flags (cacheability),
> although at the moment we only check them for validity rather than use
> them.
> 
> Functions/types renamed and reindented (because apparently we do
> that for these).
> 
> Needs a selection of IORESOURCE_* defines, which I've taken from Linux
> and have included locally for now until we figure out where else they
> might be needed.
> 
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

Reviewed-by: Julien Grall <julien.grall@xxxxxxxxxx>

Regards,

-- 
Julien Grall

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