linux-kernel - Re: [PATCH 1/3] dt-bindings: soc: qcom: Support GLINK intents

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Date:   Mon, 23 Oct 2017 11:37:56 -0700
From:   Chris Lew <clew@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Arun Kumar Neelakantam <aneela@...eaurora.org>,
        smaliyap@...eaurora.org,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-soc@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] dt-bindings: soc: qcom: Support GLINK intents



On 10/19/2017 10:00 PM, Bjorn Andersson wrote:
> On Wed 18 Oct 18:10 PDT 2017, Chris Lew wrote:
> 
>> Virtual GLINK channels may know what throughput to expect from a
>> remoteproc. An intent advertises to the remoteproc this channel is
>> ready to receive data. Allow a channel to define the size and amount of
>> intents to be prequeued.
>>
>> Signed-off-by: Chris Lew <clew@...eaurora.org>
>> ---
>>   Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt | 10 ++++++++++
>>   1 file changed, 10 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt
>> index b277eca861f7..6c21f76822ca 100644
>> --- a/Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt
>> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt
>> @@ -39,6 +39,14 @@ of these nodes are defined by the individual bindings for the specific function
>>    Definition: a list of channels tied to this function, used for matching
>>       the function to a set of virtual channels
>>
>> +- intents:
> 
> qcom,intents or qcom,default-intents
> 

Will use "qcom,intents".

>> + Usage: optional
>> + Value type: <prop-encoded-array>
>> + Definition: a list of size,amount pairs describing what intents should
>> +    be preallocated for this virtual channel. If a GLINK node
>> +    supports intents, an intent advertises this channel is ready
>> +    to receive data.
> 
> Rather than describing what a GLINK intent is I would suggest that you
> replace this second sentence with something like "This can be used to
> tweak the default intents available for the channel to meet expectations
> of the remote."
>

Sounds good, will change.

>> +
>>   = EXAMPLE
>>   The following example represents the GLINK RPM node on a MSM8996 device, with
>>   the function for the "rpm_request" channel defined, which is used for
>> @@ -69,6 +77,8 @@ regualtors and root clocks.
>>    compatible = "qcom,rpm-msm8996";
>>    qcom,glink-channels = "rpm_requests";
>>
>> + intents = <0x400 5
>> +   0x800 1>;
>>    ...
>>    };
>>    };
> 
> Regards,
> Bjorn
> 

Thanks,
Chris

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