linux-kernel - Re: [PATCH v3 9/9] interconnect: qcom: rpm: Don't use clk_get

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Date:   Mon, 23 Jan 2023 20:11:21 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Arnaud Vrac <rawoul@...il.com>
Cc:     linux-arm-msm@...r.kernel.org, andersson@...nel.org,
        agross@...nel.org, krzysztof.kozlowski@...aro.org,
        marijn.suijten@...ainline.org, bryan.odonoghue@...aro.org,
        Georgi Djakov <djakov@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 9/9] interconnect: qcom: rpm: Don't use
 clk_get_optional for bus clocks anymore



On 23.01.2023 19:41, Arnaud Vrac wrote:
> Hi Konrad,
> 
> With this series on a db820c, I get an error on boot when probing
> a0noc because no "bus" clock is defined. If I revert this patch it
> works again.
> 
> -Arnaud
Ouch! Thanks for testing and catching this, definitely an edge
case, as we usually expect there's an interconnect bus and bus_a
clock.. but that can be worked around!

Konrad
> 
> Le lun. 16 janv. 2023 à 14:31, Konrad Dybcio
> <konrad.dybcio@...aro.org> a écrit :
>>
>> Commit dd42ec8ea5b9 ("interconnect: qcom: rpm: Use _optional func for provider clocks")
>> relaxed the requirements around probing bus clocks. This was a decent
>> solution for making sure MSM8996 would still boot with old DTs, but
>> now that there's a proper fix in place that both old and new DTs
>> will be happy about, revert back to the safer variant of the
>> function.
>>
>> Fixes: dd42ec8ea5b9 ("interconnect: qcom: rpm: Use _optional func for provider clocks")
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>  drivers/interconnect/qcom/icc-rpm.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
>> index 343e6021a93a..8cff724661f2 100644
>> --- a/drivers/interconnect/qcom/icc-rpm.c
>> +++ b/drivers/interconnect/qcom/icc-rpm.c
>> @@ -522,7 +522,7 @@ int qnoc_probe(struct platform_device *pdev)
>>         }
>>
>>  regmap_done:
>> -       ret = devm_clk_bulk_get_optional(dev, qp->num_bus_clks, qp->bus_clks);
>> +       ret = devm_clk_bulk_get(dev, qp->num_bus_clks, qp->bus_clks);
>>         if (ret)
>>                 return ret;
>>
>> --
>> 2.39.0
>>