Re: [PATCH 2/3] Docs: dt: Add PCI MSI map bindings

From: Mark Rutland
Date: Mon Sep 07 2015 - 14:05:36 EST

On Fri, Sep 04, 2015 at 11:33:35PM +0100, David Daney wrote:
> Hi Mark,

Hi David,

> I now have a prototype implementation for irq-gic-v3-its.c that is using
> this binding on Cavium's ThunderX platform.
> Q: Have you guys had any more thoughts on this that might require
> changing the binding?

Having discussed this with Stuart and others at Linux Plumbers, I think
that the binding is sufficient, and unlikely to change greatly unless
there is a strong objection (Stuart, please correct me if I am wrong).

Per Marc's comments there are probably some edge cases and/or wording
details to sort out, but I think the common/simple case is sorted. I'll
send a v2 once those have been settled.

> If not, I will be sending out my patches for your consideration.

Please do!

> Thanks,
> David Daney
> On 07/27/2015 01:16 AM, Marc Zyngier wrote:
> > On 23/07/15 17:52, Mark Rutland wrote:
> >> Currently msi-parent is used by a few bindings to describe the
> >> relationship between a PCI root complex and a single MSI controller, but
> >> this property does not have a generic binding document.
> >>
> >> Additionally, msi-parent is insufficient to describe more complex
> >> relationships between MSI controllers and devices under a root complex,
> >> where devices may be able to target multiple MSI controllers, or where
> >> MSI controllers use (non-probeable) sideband information to distinguish
> >> devices.
> >>
> >> This patch adds a generic binding for mapping PCI devices to MSI
> >> controllers. This document covers msi-parent, and a new msi-map property
> >> (specific to PCI*) which may be used to map devices (identified by their
> >> Requester ID) to sideband data for each MSI controller that they may
> >> target.
> >>
> >> Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx>
> Acked-by: David Daney <david.daney@xxxxxxxxxx>


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