linux-kernel - Re: [PATCH v4 4/5] dt-bindings: remoteproc: Add documentation for ZynqMP R5 rproc bindings

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Message-ID: <CAL_JsqLGo380SRYska+xGgJhgF8NCRvY56ewafvSCU6c-LmhZw@mail.gmail.com>
Date:   Wed, 10 Jun 2020 14:38:45 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ben Levinsky <BLEVINSK@...inx.com>
Cc:     "ohad@...ery.com" <ohad@...ery.com>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        Michal Simek <michals@...inx.com>,
        Jolly Shah <JOLLYS@...inx.com>, Rajan Vaja <RAJANV@...inx.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Stefano Stabellini <stefanos@...inx.com>
Subject: Re: [PATCH v4 4/5] dt-bindings: remoteproc: Add documentation for
 ZynqMP R5 rproc bindings

On Tue, May 26, 2020 at 11:40 AM Ben Levinsky <BLEVINSK@...inx.com> wrote:
>
> Hi Rob,
>
> The Xilinx R5 Remoteproc driver has been around for a long time -- admittedly we should have upstreamed it long ago. The driver in the current form is using an "classic" remoteproc device tree node as described here.

I would rather not have 2 possible bindings to maintain. If there's
been no rush to upstream this til now, then it can wait longer.

>
> I am working with Stefano to come up with an appropriate System Device Tree representation but it is not going to be ready right away. Our preference would be to upstream the remoteproc node and driver in their current forms while system device tree is maturing.

There's obviously going to still need to be some sort of description
of the interface between cores, but this has parts that obviously
conflict with what's getting defined for system DT. The TCMs are the
most obvious. If you can remove (or hardcode in the driver) what
conflicts, then perhaps this can be upstreamed now.

Rob