On Mon, Mar 8, 2021 at 2:56 PM Arnd Bergmann [off-list ref] wrote:

On Mon, Mar 8, 2021 at 10:14 PM Rob Herring [off-list ref] wrote:

quoted

On Mon, Mar 08, 2021 at 09:29:54PM +0100, Arnd Bergmann wrote:

quoted

On Mon, Mar 8, 2021 at 4:56 PM Rob Herring [off-list ref] wrote:

Let's just stick with 'nonposted-mmio', but drop 'posted-mmio'. I'd
rather know if and when we need 'posted-mmio'. It does need to be added
to the DT spec[1] and schema[2] though (GH PRs are fine for both).

I think the reason for having "posted-mmio" is that you cannot properly
define the PCI host controller nodes on the M1 without that: Since
nonposted-mmio applies to all child nodes, this would mean the PCI
memory space gets declared as nonposted by the DT, but the hardware
requires it to be mapped as posted.

I don't think so. PCI devices wouldn't use any of the code paths in
this patch. They would map their memory space with plain ioremap()
which is posted.

Rob

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