linux-kernel - Re: [PATCH v5 08/10] interconnect: qcom: msm8996: Specify no bus clock scaling on A0NoC

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Message-ID: <3c205131-632a-6592-5dc0-82313b26e5f6@linaro.org>
Date:   Fri, 17 Feb 2023 20:53:16 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Georgi Djakov <djakov@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Jun Nie <jun.nie@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Brian Masney <masneyb@...tation.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Yassine Oudjana <y.oudjana@...tonmail.com>
Cc:     Georgi Djakov <georgi.djakov@...aro.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 08/10] interconnect: qcom: msm8996: Specify no bus
 clock scaling on A0NoC



On 17.02.2023 20:27, Konrad Dybcio wrote:
> 
> 
> On 17.02.2023 11:46, Konrad Dybcio wrote:
>> A0NoC only does bus scaling through RPM votes and does not have any
>> ICC clocks. Describe this.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
> This is bad, as devm_clk_get_bulk{"", _optional} doesn't
> check if num_clocks makes sense and passes "-1" down the
> devres alloc chain..
> 
> I'll rework this for the next revision by simply assigning
> the common "bus", "bus_a" set everywhere instead of relying
> on it being there by default..
Or maybe I shouldn't, as that will require redefining the array
over and over again.. Perhaps just passing <&xo_board>, <&xo_board>
to a0noc's "bus", "bus_a", similar to what's been done on SDM630's
GNoC would be less messy?

Konrad
> 
> Konrad
>>  drivers/interconnect/qcom/msm8996.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/interconnect/qcom/msm8996.c b/drivers/interconnect/qcom/msm8996.c
>> index 1a5e0ad36cc4..45eb8675fb11 100644
>> --- a/drivers/interconnect/qcom/msm8996.c
>> +++ b/drivers/interconnect/qcom/msm8996.c
>> @@ -1817,6 +1817,7 @@ static const struct qcom_icc_desc msm8996_a0noc = {
>>  	.type = QCOM_ICC_NOC,
>>  	.nodes = a0noc_nodes,
>>  	.num_nodes = ARRAY_SIZE(a0noc_nodes),
>> +	.num_bus_clocks = -1, /* No bus clock scaling */
>>  	.intf_clocks = a0noc_intf_clocks,
>>  	.num_intf_clocks = ARRAY_SIZE(a0noc_intf_clocks),
>>  	.has_bus_pd = true,
>>