linux-kernel - Re: [PATCH V5 1/7] arm64: dts: sc7280: Add QSPI node

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Date:   Thu, 26 Aug 2021 18:29:41 +0530
From:   rajpat@...eaurora.org
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, swboyd@...omium.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, rnayak@...eaurora.org,
        saiprakash.ranjan@...eaurora.org, msavaliy@....qualcomm.com,
        skakit@...eaurora.org
Subject: Re: [PATCH V5 1/7] arm64: dts: sc7280: Add QSPI node

On 2021-08-12 18:39, Matthias Kaehlcke wrote:
> On Thu, Aug 12, 2021 at 01:11:12PM +0530, Rajesh Patil wrote:
>> From: Roja Rani Yarubandi <rojay@...eaurora.org>
>> 
>> Add QSPI DT node and qspi_opp_table for SC7280 SoC.
>> 
>> Signed-off-by: Roja Rani Yarubandi <rojay@...eaurora.org>
>> Signed-off-by: Rajesh Patil <rajpat@...eaurora.org>
>> ---
>>  arch/arm64/boot/dts/qcom/sc7280.dtsi | 62 
>> ++++++++++++++++++++++++++++++++++++
>>  1 file changed, 62 insertions(+)
>> 
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi 
>> b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> index 53a21d0..f8dd5ff 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> @@ -415,6 +415,25 @@
>>  		method = "smc";
>>  	};
>> 
>> +	qspi_opp_table: qspi-opp-table {
>> +		compatible = "operating-points-v2";
>> +
>> +		opp-75000000 {
>> +			opp-hz = /bits/ 64 <75000000>;
>> +			required-opps = <&rpmhpd_opp_low_svs>;
>> +		};
>> +
>> +		opp-150000000 {
>> +			opp-hz = /bits/ 64 <150000000>;
>> +			required-opps = <&rpmhpd_opp_svs>;
>> +		};
>> +
>> +		opp-300000000 {
>> +			opp-hz = /bits/ 64 <300000000>;
>> +			required-opps = <&rpmhpd_opp_nom>;
>> +		};
>> +	};
>> +
> 
> From v3:
> 
> roja> Can we move this "qspi_opp_table" to / from /soc?
> 
> bjorn> If you have made a proper attempt to convince Rob and Mark that
> bjorn> a child "opp-table" in a SPI master is not a SPI device - and 
> the
> bjorn> conclusion is that this is not a good idea...then yes it should 
> live
> bjorn> outside /soc.
> 
> I didn't see a follow up on this, was such an attempt made? Is there a
> link to the discussion?

For now I am keeping qspi_opp_table  and qup_opp_table outside the SoC 
and posting V6.
I will continue the discussion with DT folks and once concluded I will 
update as required.