linux-kernel - Re: [PATCH 1/6] dt-bindings: soc: qcom: Add interconnect binding for GENI QUP

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Date:   Wed, 23 Jan 2019 20:41:20 +0200
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Alok Chauhan <alokc@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-serial@...r.kernel.org,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, dianders@...omium.org,
        swboyd@...omium.org
Subject: Re: [PATCH 1/6] dt-bindings: soc: qcom: Add interconnect binding for
 GENI QUP

Hi,

On 1/23/19 19:07, Bjorn Andersson wrote:
> On Mon 21 Jan 22:33 PST 2019, Alok Chauhan wrote:
> 
>> Add documentation for the interconnect and interconnect-names bindings
>> for the GENI QUP as detailed by bindings/interconnect/interconnect.txt.
>>
>> Signed-off-by: Alok Chauhan <alokc@...eaurora.org>
>> ---
>>  Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt | 10 ++++++++++
>>  1 file changed, 10 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt
>> index dab7ca9..44d7e02 100644
>> --- a/Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt
>> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt
>> @@ -17,6 +17,12 @@ Required properties if child node exists:
>>  - #address-cells: 	Must be <1> for Serial Engine Address
>>  - #size-cells: 		Must be <1> for Serial Engine Address Size
>>  - ranges: 		Must be present
>> +- interconnects:	phandle to a interconnect provider. Please refer
>> +			../interconnect/interconnect.txt for details.
>> +			Must be 2 paths corresponding to 2 AXI ports.
>> +- interconnect-names:	Port names to differentiate between the
> 
> s/Port names/Path names/
> 
>> +			2 interconnect paths defined with interconnect
>> +			specifier.
> 
> These two names are significant in that they must match what the driver
> expects, hence you must actually specify them here.
> 
> And as the scope of these strings are local to the QUP node you can omit
> "qup" from them, so make them "memory" and "config" (or perhaps iface,
> to match the clock naming?).

Actually there was a discussion in the past where we decided include
both the src and dst endpoint names in this property so that there is
some symmetry with the "interconnects" property. It would be nice to be
consistent across different drivers at least for now.
If we want to denote the master and slave ports here, my two cents would
be for "qup-mem" and "cpu-qup" or something similar?

Thanks,
Georgi