linux-kernel - Re: [PATCH v2 3/9] dt-bindings: clock: ipq5332: drop the few nss clocks definition

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Message-ID: <2e357fcf-5348-4fb2-b693-2d6bb4d58b21@quicinc.com>
Date:   Wed, 22 Nov 2023 15:48:40 +0530
From:   Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Richard Cochran <richardcochran@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
CC:     <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 3/9] dt-bindings: clock: ipq5332: drop the few nss
 clocks definition



On 11/22/2023 3:42 PM, Krzysztof Kozlowski wrote:
> On 22/11/2023 11:08, Kathiravan Thirumoorthy wrote:
>>
>>
>> On 11/21/2023 8:36 PM, Krzysztof Kozlowski wrote:
>>> On 21/11/2023 15:30, Kathiravan Thirumoorthy wrote:
>>>> In commit 0dd3f263c810 ("clk: qcom: ipq5332: enable few nssnoc clocks in
>>>
>>> Where is this commit coming from?
>>>
>>>> driver probe"), gcc_snoc_nssnoc_clk, gcc_snoc_nssnoc_1_clk,
>>>> gcc_nssnoc_nsscc_clk are enabled in driver probe to keep it always-on.
>>>
>>> Implementation can change and for example bring back these clocks. Are
>>> you going to change bindings? No, drop the patch.
>>>
>>> Bindings should be dropped only in a few rare cases like clocks not
>>> available for OS or bugs.
>>
>> Thanks Krzysztof. Will drop this patch in V3.
>>
>> One more question to understand further. In IPQ SoCs there are bunch of
>> coresight / QDSS clocks but coresight framework doesn't handle all
>> clocks. Those clocks are enabled in bootloader stage itself. In such
>> case, should I drop the clocks from both binding and driver or only from
>> driver?
> 
> That's not really the reason to drop them at all. Neither from driver,
> nor from bindings. You should not rely on bootloader handling your clocks


Thanks, lets say if those clocks are not needed at all by OS since QDSS 
is not used and needed only for the boot loaders to access the 
corresponding address space, in such case what can be done? I 
understand, at first those clocks should not have been added to the driver.


> 
> Best regards,
> Krzysztof
>