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

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Message-ID: <518770c2-05ad-a2a2-4e73-7ceb30687614@linaro.org>
Date:   Thu, 27 Jul 2023 09:59:10 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Tengfei Fan <quic_tengfan@...cinc.com>, 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

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