linux-kernel - Re: [PATCH 17/19] arm64: defconfig: enable clock controller, interconnect and pinctrl for QCS8300

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Message-ID: <c674b8ff-6fdb-419d-86f4-69a940eccc2f@quicinc.com>
Date: Fri, 6 Sep 2024 14:15:38 +0800
From: Jingyi Wang <quic_jingyw@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: Krzysztof Kozlowski <krzk@...nel.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob
 Herring <robh@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
        Bartosz
 Golaszewski <bartosz.golaszewski@...aro.org>,
        Konrad Dybcio
	<konradybcio@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-remoteproc@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 17/19] arm64: defconfig: enable clock controller,
 interconnect and pinctrl for QCS8300

Hi Dmitry,

On 9/6/2024 11:18 AM, Dmitry Baryshkov wrote:
> On Thu, Sep 05, 2024 at 12:54:35PM GMT, Jingyi Wang wrote:
>>
>>
>> On 9/4/2024 5:39 PM, Krzysztof Kozlowski wrote:
>>> On 04/09/2024 10:33, Jingyi Wang wrote:
>>>> Enable clock controller, interrconnect and pinctrl for QCS8300.
>>>
>>> NXP QCS8300? What is QCS8300? Which products use it? That's a defconfig
>>> for entire kernel, not your Qualcomm one.
>>>
>> Will describe it in more detail.
>>>> It needs to be built-in for UART to provide a console.
>>>>
>>>> Signed-off-by: Jingyi Wang <quic_jingyw@...cinc.com>
>>>> ---
>>>>  arch/arm64/configs/defconfig | 3 +++
>>>>  1 file changed, 3 insertions(+)
>>>>
>>>> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
>>>> index 81ca46e3ab4b..a9ba6b25a0ed 100644
>>>> --- a/arch/arm64/configs/defconfig
>>>> +++ b/arch/arm64/configs/defconfig
>>>> @@ -606,6 +606,7 @@ CONFIG_PINCTRL_MSM8996=y
>>>>  CONFIG_PINCTRL_MSM8998=y
>>>>  CONFIG_PINCTRL_QCM2290=y
>>>>  CONFIG_PINCTRL_QCS404=y
>>>> +CONFIG_PINCTRL_QCS8300=y
>>>>  CONFIG_PINCTRL_QDF2XXX=y
>>>>  CONFIG_PINCTRL_QDU1000=y
>>>>  CONFIG_PINCTRL_SA8775P=y
>>>> @@ -1317,6 +1318,7 @@ CONFIG_MSM_MMCC_8998=m
>>>>  CONFIG_QCM_GCC_2290=y
>>>>  CONFIG_QCM_DISPCC_2290=m
>>>>  CONFIG_QCS_GCC_404=y
>>>> +CONFIG_QCS_GCC_8300=y
>>>>  CONFIG_QDU_GCC_1000=y
>>>>  CONFIG_SC_CAMCC_8280XP=m
>>>>  CONFIG_SC_DISPCC_7280=m
>>>> @@ -1618,6 +1620,7 @@ CONFIG_INTERCONNECT_QCOM_MSM8996=y
>>>>  CONFIG_INTERCONNECT_QCOM_OSM_L3=m
>>>>  CONFIG_INTERCONNECT_QCOM_QCM2290=y
>>>>  CONFIG_INTERCONNECT_QCOM_QCS404=m
>>>> +CONFIG_INTERCONNECT_QCOM_QCS8300=y
>>>
>>> Why this cannot be a module?
>>>
>>>
>> I think the commit-msg "It needs to be built-in for UART to provide a console." can
>> explain that, could you please help to share your insights on that?
> 
> Unless loading these modules from initramfs doesn't work, please use =m.
> The drivers that are enabled here are going to be enabled for everybody
> using arm64 defconfig, taking up memory on their platforms, etc.
>
We had previous discussion here about why these drivers needs to be built-in to support
debug-uart:
https://lore.kernel.org/linux-arm-msm/c11fd3c2-770a-4d40-8cf3-d8bc81f7c480@kernel.org/
I will mention more details in the commit message of this patch.

Thanks,
Jingyi