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

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Date:   Wed, 20 Dec 2017 17:35:57 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Chris Lew <clew@...eaurora.org>, andy.gross@...aro.org,
        david.brown@...aro.org, aneela@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        linux-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] dt-bindings: soc: qcom: Add label for GLINK bindings

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.

In the current implementation of SMD this value goes straight into an
sysfs attribute that we can use when writing udev rules and for the DIAG
implementation to pair up channels related to the same remoteproc. This
adds the equivalent information for glink-backed channels.


I'm therefor in favor of picking this patch.

Regards,
Bjorn

> > 
> > Signed-off-by: Chris Lew <clew@...eaurora.org>
> > ---
> >  Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt
> > index 9663cab52246..0b8cc533ca83 100644
> > --- a/Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt
> > +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt
> > @@ -10,6 +10,11 @@ edge.
> >  	Value type: <stringlist>
> >  	Definition: must be "qcom,glink-rpm"
> >  
> > +- label:
> > +	Usage: optional
> > +	Value type: <string>
> > +	Definition: should specify the subsystem name this edge corresponds to.
> > +
> >  - interrupts:
> >  	Usage: required
> >  	Value type: <prop-encoded-array>
> > -- 
> > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> > a Linux Foundation Collaborative Project
> >