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Date:   Sat, 16 Sep 2023 18:13:15 +0300
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Subject: Re: [PATCH v2 8/8] arm64: defconfig: enable interconnect and pinctrl
 for SM4450
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To:     Trilok Soni <quic_tsoni@quicinc.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        Tengfei Fan <quic_tengfan@quicinc.com>, will@kernel.org,
        robin.murphy@arm.com, joro@8bytes.org, robh+dt@kernel.org,
        krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
        agross@kernel.org, andersson@kernel.org, konrad.dybcio@linaro.org,
        catalin.marinas@arm.com
Cc:     geert+renesas@glider.be, arnd@arndb.de, neil.armstrong@linaro.org,
        nfraprado@collabora.com, rafal@milecki.pl, peng.fan@nxp.com,
        linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-msm@vger.kernel.org, quic_shashim@quicinc.com,
        quic_kaushalk@quicinc.com, quic_tdas@quicinc.com,
        quic_tingweiz@quicinc.com, quic_aiquny@quicinc.com,
        kernel@quicinc.com
References: <20230915021509.25773-1-quic_tengfan@quicinc.com>
 <20230915021509.25773-10-quic_tengfan@quicinc.com>
 <8f2c9664-a2c8-50dc-8a1c-e50a071ebeb2@linaro.org>
 <e9ff05b3-2742-416e-b417-5e2414036008@quicinc.com>
 <0a34dd35-7aea-4655-4cdd-e7196a1ba52b@linaro.org>
 <f76e1cc8-fc48-4208-bbe4-9204d9d28363@quicinc.com>
 <b7398390-23bc-467c-5b83-411110d60f43@linaro.org>
 <01c020ae-a019-e4eb-14cb-64503bde05a6@quicinc.com>
 <212f9bfa-6d4c-bba2-60d2-272c001a4322@quicinc.com>
From:   Georgi Djakov <djakov@kernel.org>
In-Reply-To: <212f9bfa-6d4c-bba2-60d2-272c001a4322@quicinc.com>
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Precedence: bulk

Hi Trilok,

On 16.09.23 5:25, Trilok Soni wrote:
> On 9/15/2023 7:21 PM, Trilok Soni wrote:
>> On 9/15/2023 4:29 AM, Krzysztof Kozlowski wrote:
>>> On 15/09/2023 13:18, Tengfei Fan wrote:
>>>>
>>>>
>>>> 在 9/15/2023 5:16 PM, Krzysztof Kozlowski 写道:
>>>>> On 15/09/2023 11:12, Tengfei Fan wrote:
>>>>>>
>>>>>>
>>>>>> 在 9/15/2023 3:21 PM, Krzysztof Kozlowski 写道:
>>>>>>> On 15/09/2023 04:15, Tengfei Fan wrote:
>>>>>>>> Add the SM4450 interconnect and pinctrl drivers as built-in for
>>>>>>>> support the Qualcomm SM4450 platform to boot to uart shell.
>>>>>>>>
>>>>>>>> Signed-off-by: Tengfei Fan <quic_tengfan@quicinc.com>
>>>>>>>> ---
>>>>>>>>     arch/arm64/configs/defconfig | 2 ++
>>>>>>>>     1 file changed, 2 insertions(+)
>>>>>>>>
>>>>>>>> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
>>>>>>>> index ec59174b14db..e91993de865e 100644
>>>>>>>> --- a/arch/arm64/configs/defconfig
>>>>>>>> +++ b/arch/arm64/configs/defconfig
>>>>>>>> @@ -598,6 +598,7 @@ CONFIG_PINCTRL_SC8280XP=y
>>>>>>>>     CONFIG_PINCTRL_SDM660=y
>>>>>>>>     CONFIG_PINCTRL_SDM670=y
>>>>>>>>     CONFIG_PINCTRL_SDM845=y
>>>>>>>> +CONFIG_PINCTRL_SM4450=y
>>>>>>>>     CONFIG_PINCTRL_SM6115=y
>>>>>>>>     CONFIG_PINCTRL_SM6125=y
>>>>>>>>     CONFIG_PINCTRL_SM6350=y
>>>>>>>> @@ -1500,6 +1501,7 @@ CONFIG_INTERCONNECT_QCOM_SC7280=y
>>>>>>>>     CONFIG_INTERCONNECT_QCOM_SC8180X=y
>>>>>>>>     CONFIG_INTERCONNECT_QCOM_SC8280XP=y
>>>>>>>>     CONFIG_INTERCONNECT_QCOM_SDM845=y
>>>>>>>> +CONFIG_INTERCONNECT_QCOM_SM4450=y
>>>>>>>
>>>>>>> Why it cannot be =m?
>>>>>>>
>>>>>>> Best regards,
>>>>>>> Krzysztof
>>>>>>>
>>>>>>
>>>>>> Hi Krzysztof,
>>>>>> Because system haven't capacity of loading ko files at this time on
>>>>>> SM4450 platform, so setting to "Y".
>>>>>
>>>>> Hm? System has this capability. All systems have. What is so different
>>>>> on SM4450 comparing to everything else we have here?
>>>>>
>>>>> No, this should be =m and you need to fix your system.
>>>>>
>>>>> Best regards,
>>>>> Krzysztof
>>>>>
>>>> Hi Krzysztof,
>>>> Find new way which can load ko files on SM4450 platform, still need use
>>>> "Y", because of some other modules have dependence to these two config,
>>>> like scm, smmu module drivers, uart shell console cannot be got if set
>>>> to "m".
>>>
>>> That's what I am asking, which device exactly needs it.
>>>
>>>>
>>>> Also do test for setting these two config to "m" on SM8450 platform, get
>>>> uart shell consle failed if so setting.
>>>
>>> Yeah, this we know, I did this. I am asking about SM4450.
>>
>> Why we have =m requirement when other drivers above are =Y?. Can we confirm
>> w/ Georgi? I am not aware that Interconnect drivers needs to be =m only.
>>
>> CONFIG_INTERCONNECT_QCOM_SC8180X=y
>> CONFIG_INTERCONNECT_QCOM_SC8280XP=y
>> CONFIG_INTERCONNECT_QCOM_SDM845=y
> 
> Complete list here, and it is inconsistent. Latest 8550 is also =y. Do we document
> the reasons somewhere on why they are added as =y?
> 
> CONFIG_INTERCONNECT_QCOM=y
> CONFIG_INTERCONNECT_QCOM_MSM8916=m
> CONFIG_INTERCONNECT_QCOM_MSM8996=m
> CONFIG_INTERCONNECT_QCOM_OSM_L3=m
> CONFIG_INTERCONNECT_QCOM_QCM2290=m
> CONFIG_INTERCONNECT_QCOM_QCS404=m
> CONFIG_INTERCONNECT_QCOM_SA8775P=y
> CONFIG_INTERCONNECT_QCOM_SC7180=y
> CONFIG_INTERCONNECT_QCOM_SC7280=y
> CONFIG_INTERCONNECT_QCOM_SC8180X=y
> CONFIG_INTERCONNECT_QCOM_SC8280XP=y
> CONFIG_INTERCONNECT_QCOM_SDM845=y
> CONFIG_INTERCONNECT_QCOM_SM8150=m
> CONFIG_INTERCONNECT_QCOM_SM8250=m
> CONFIG_INTERCONNECT_QCOM_SM8350=m
> CONFIG_INTERCONNECT_QCOM_SM8450=y
> CONFIG_INTERCONNECT_QCOM_SM8550=y

If the device can boot (to console/initramfs) with =m, we go with that.
But if something critical like the UART depends on the interconnect
provider, then we make it built-in.

On SM8550 for example, we have enabled bandwidth scaling support for QUP
and that's why it needs to be =y.

It looks like on SM4450 this should be =y too.

Thanks,
Georgi