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

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Message-ID: <CAA8EJpoxEZEZD3hhfpS6MeizqDVDDBjJOGo3X2BrLiEoZHDuoQ@mail.gmail.com>
Date: Fri, 6 Sep 2024 12:36:20 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Jingyi Wang <quic_jingyw@...cinc.com>
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

On Fri, 6 Sept 2024 at 09:15, Jingyi Wang <quic_jingyw@...cinc.com> wrote:
>
> 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.

Yes, please. Explicitly mention that this is required to get UART to work.

-- 
With best wishes
Dmitry