linux-kernel - Re: [PATCH v2 4/6] arm64: dts: qcom: Add base SM4450 QRD DTS

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Message-ID: <ba733dbe-c44e-2199-e7f4-7152a9be065b@quicinc.com>
Date:   Thu, 27 Jul 2023 16:49:25 +0800
From:   Tengfei Fan <quic_tengfan@...cinc.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <andersson@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>
CC:     <quic_tsoni@...cinc.com>, <quic_shashim@...cinc.com>,
        <quic_kaushalk@...cinc.com>, <quic_tdas@...cinc.com>,
        <quic_tingweiz@...cinc.com>, <quic_aiquny@...cinc.com>,
        <kernel@...cinc.com>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/6] arm64: dts: qcom: Add base SM4450 QRD DTS



在 7/27/2023 3:59 PM, Konrad Dybcio 写道:
> On 27.07.2023 08:56, Krzysztof Kozlowski wrote:
>> On 27/07/2023 04:35, Tengfei Fan wrote:
>>> Add DTS for Qualcomm QRD platform which uses SM4450 SoC.
>>>
>>> Signed-off-by: Tengfei Fan <quic_tengfan@...cinc.com>
>>> ---
>>>   arch/arm64/boot/dts/qcom/Makefile       |  1 +
>>>   arch/arm64/boot/dts/qcom/sm4450-qrd.dts | 18 ++++++++++++++++++
>>>   2 files changed, 19 insertions(+)
>>>   create mode 100644 arch/arm64/boot/dts/qcom/sm4450-qrd.dts
>>>
>>> diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
>>> index 337abc4ceb17..db805d0929c8 100644
>>> --- a/arch/arm64/boot/dts/qcom/Makefile
>>> +++ b/arch/arm64/boot/dts/qcom/Makefile
>>> @@ -186,6 +186,7 @@ dtb-$(CONFIG_ARCH_QCOM)	+= sdm850-lenovo-yoga-c630.dtb
>>>   dtb-$(CONFIG_ARCH_QCOM)	+= sdm850-samsung-w737.dtb
>>>   dtb-$(CONFIG_ARCH_QCOM)	+= sdx75-idp.dtb
>>>   dtb-$(CONFIG_ARCH_QCOM)	+= sm4250-oneplus-billie2.dtb
>>> +dtb-$(CONFIG_ARCH_QCOM)	+= sm4450-qrd.dtb
>>>   dtb-$(CONFIG_ARCH_QCOM)	+= sm6115-fxtec-pro1x.dtb
>>>   dtb-$(CONFIG_ARCH_QCOM)	+= sm6115p-lenovo-j606f.dtb
>>>   dtb-$(CONFIG_ARCH_QCOM)	+= sm6125-sony-xperia-seine-pdx201.dtb
>>> diff --git a/arch/arm64/boot/dts/qcom/sm4450-qrd.dts b/arch/arm64/boot/dts/qcom/sm4450-qrd.dts
>>> new file mode 100644
>>> index 000000000000..04ad1dd4285a
>>> --- /dev/null
>>> +++ b/arch/arm64/boot/dts/qcom/sm4450-qrd.dts
>>> @@ -0,0 +1,18 @@
>>> +// SPDX-License-Identifier: BSD-3-Clause
>>> +/*
>>> + * Copyright (c) 2023, Qualcomm Innovation Center, Inc. All rights reserved.
>>> + */
>>> +
>>> +/dts-v1/;
>>> +
>>> +#include "sm4450.dtsi"
>>> +/ {
>>> +	model = "Qualcomm Technologies, Inc. SM4450 QRD";
>>> +	compatible = "qcom,sm4450-qrd", "qcom,sm4450";
>>> +
>>> +	aliases { };
>>> +
>>> +	chosen {
>>> +		bootargs = "console=hvc0 earlycon=hvc0 hvc_dcc.enable=1 cpuidle.off=1";
>>
>> No earlycon, no hvc.enable (there is no such parameter), no cpuidle.off
>> (again don't add fake stuff). So the only suitable argument is console,
>> but this should be actually used via stdout path, although it seems
>> there is no device node for such usage?
> hvc totally comes from Qualcomm downstream and all the Gunyah
> shenanigans..
> 
> Tengfei, please ensure the patches are tested against linux-next
> with no additional changes or modules, with a clean Linux userspace
> (or at least a ramdisk).
> 
> Konrad
Hi Konrad,
All these patches are tesed on linux-next, and get DCC console.
For support this test, I did a temporal for enable CONFIG_HVC_DCC(this 
change haven't push to upstream).

-- 
Thx and BRs,
Tengfei Fan