linux-kernel - Re: [PATCH] soc: qcom: apr: Don't use reg for domain id

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Date:   Thu, 23 May 2019 07:45:08 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soc: qcom: apr: Don't use reg for domain id

On Thu 23 May 07:38 PDT 2019, Srinivas Kandagatla wrote:

> 
> 
> On 22/05/2019 02:53, Bjorn Andersson wrote:
> > The reg property represents the address and size on the bus that a
> > device lives, but for APR the parent is a rpmsg bus, which does not have
> > numerical addresses. Simply defining #address/#size-cells to 1 and 0,
> > respectively, to silence the compiler is not an appropriate solution.
> > 
> I agree.
> 
> > Replace the use of "reg" with an APR specific property.
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > ---
> Can you also change the example too.
> 

Of course, sorry for missing that.

> other than that am okay with the change.
> 
> Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> 

Thanks,
Bjorn

> --srini
> > 
> > The APR device was recently added to msm8996.dtsi, but this is still
> > depending on working SMMU to provide functional audio support.
> > 
> >   Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt | 2 +-
> >   drivers/soc/qcom/apr.c                                  | 2 +-
> >   2 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt
> > index bcc612cc7423..38d3c06abc41 100644
> > --- a/Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt
> > +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt
> > @@ -9,7 +9,7 @@ used for audio/voice services on the QDSP.
> >   	Value type: <stringlist>
> >   	Definition: must be "qcom,apr-v<VERSION-NUMBER>", example "qcom,apr-v2"
> > -- reg
> > +- qcom,apr-domain
> >   	Usage: required
> >   	Value type: <u32>
> >   	Definition: Destination processor ID.
> > diff --git a/drivers/soc/qcom/apr.c b/drivers/soc/qcom/apr.c
> > index 74f8b9607daa..b83d71b2e0a4 100644
> > --- a/drivers/soc/qcom/apr.c
> > +++ b/drivers/soc/qcom/apr.c
> > @@ -276,7 +276,7 @@ static int apr_probe(struct rpmsg_device *rpdev)
> >   	if (!apr)
> >   		return -ENOMEM;
> > -	ret = of_property_read_u32(dev->of_node, "reg", &apr->dest_domain_id);
> > +	ret = of_property_read_u32(dev->of_node, "qcom,apr-domain", &apr->dest_domain_id);
> >   	if (ret) {
> >   		dev_err(dev, "APR Domain ID not specified in DT\n");
> >   		return ret;
> >