linux-kernel - Re: [PATCH v3 4/7] arm64: dts: qcom: sc7280: Update VA/RX/TX macro clock nodes

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Message-ID: <3299b57b-7260-0189-ba6f-824db391d81c@quicinc.com>
Date:   Fri, 20 Jan 2023 12:05:09 +0530
From:   Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <vkoul@...nel.org>, <agross@...nel.org>, <andersson@...nel.org>,
        <robh+dt@...nel.org>, <broonie@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_rohkumar@...cinc.com>,
        <srinivas.kandagatla@...aro.org>, <dianders@...omium.org>,
        <swboyd@...omium.org>, <judyhsiao@...omium.org>,
        <alsa-devel@...a-project.org>, <quic_rjendra@...cinc.com>,
        <konrad.dybcio@...ainline.org>, <mka@...omium.org>
Subject: Re: [PATCH v3 4/7] arm64: dts: qcom: sc7280: Update VA/RX/TX macro
 clock nodes


On 1/20/2023 11:54 AM, Krzysztof Kozlowski wrote:
Thanks for your valuable suggestion Krzysztof!!!
> On 20/01/2023 05:47, Srinivasa Rao Mandadapu wrote:
>> On 1/19/2023 7:01 PM, Krzysztof Kozlowski wrote:
>> Thanks for your time Krzysztof!!!
>>> On 19/01/2023 13:27, Srinivasa Rao Mandadapu wrote:
>>>> Update VA, RX and TX macro and lpass_tlmm clock properties and
>>>> enable them.
>>> Everything is an update and this does not explain what exactly you are
>>> updating in the nodes and why.
>>>
>>>> Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
>>>> Tested-by: Mohammad Rafi Shaik <quic_mohs@...cinc.com>
>>>> ---
>>>>    .../qcom/sc7280-herobrine-audioreach-wcd9385.dtsi  | 59 ++++++++++++++++++++++
>>>>    1 file changed, 59 insertions(+)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/qcom/sc7280-herobrine-audioreach-wcd9385.dtsi b/arch/arm64/boot/dts/qcom/sc7280-herobrine-audioreach-wcd9385.dtsi
>>>> index 81e0f3a..674b01a 100644
>>>> --- a/arch/arm64/boot/dts/qcom/sc7280-herobrine-audioreach-wcd9385.dtsi
>>>> +++ b/arch/arm64/boot/dts/qcom/sc7280-herobrine-audioreach-wcd9385.dtsi
>>>> @@ -8,8 +8,67 @@
>>>>    
>>>>    #include <dt-bindings/sound/qcom,q6afe.h>
>>>>    
>>>> +/delete-node/ &lpass_rx_macro;
>>> Why?
>> Actually in SoC dtsi (sc7280.dtsi) power domains property used.
>>
>> Which is not required for ADSP based solution. As there is no way to delete
>>
>> individual property, deleting node and recreating it here.
>>
> You can delete property - delete-property. However why in AudioReach
> device comes without power domains? What does it mean "power domains
> property is not required"? DTS describes the hardware and the rx macro
> is powered, isn't it?

Actually in case ADSP bypass solution power domains are handled in HLOS 
clock driver.

Whereas in ADSP based solution they are handled in ADSP firmware, and 
from HLOS

voted as clocks.

Below is the reference commit.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9e3d83c52844f955aa2975f78cee48bf9f72f5e1

>
> Best regards,
> Krzysztof
>