linux-kernel - Re: [PATCH 1/6] dt-bindings: soc: qcom: Add label for GLINK bindings

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Date:   Thu, 21 Dec 2017 16:39:58 -0600
From:   Rob Herring <robh@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Chris Lew <clew@...eaurora.org>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Arun Kumar Neelakantam <aneela@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:REMOTE PROCESSOR (REMOTEPROC) SUBSYSTEM" 
        <linux-remoteproc@...r.kernel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/6] dt-bindings: soc: qcom: Add label for GLINK bindings

On Wed, Dec 20, 2017 at 7:35 PM, Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
> On Wed 20 Dec 10:30 PST 2017, Rob Herring wrote:
>
>> On Mon, Dec 18, 2017 at 02:02:09PM -0800, Chris Lew wrote:
>> > Add a label property to identify the edge this node represents.
>>
>> Why does a user need to know this?
>>
>
> We have multiple remoteproc instances, each one having one or more
> associated SMD or GLINK links (this node), exposing logical
> communication channels. Some of these logical channels are exposed to
> user space and we need a way to distinguish them there.

They should have some sort of discoverable property. There must be
some reason why you need a specific channel. I think of label as being
a sticker or silkscreen on a device which doesn't seem to be the case
here. This seems more like wanting fixed device numbering like disks
and I assume you know the position on fixed device numbers.

Rob