On 27/07/2023 10:27, Tengfei Fan wrote:
>
>
> 在 7/27/2023 2:56 PM, Krzysztof Kozlowski 写道:
>> 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@xxxxxxxxxxx>
>>> ---
>>> 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?
> Hi Krzysztof,
> Checked upstream linux kernel code, there is not "hvc_dcc.enable", but
> have other parameters, like earlycon, cpuidle.off.
> Do you mean we should not set "earlycon=hvc0 cpuidle.off=1" parameters,
Of course not. Why production code would have earlycon? This is debug
argument, not suitable for each user of this DTS.
cpuidle.off is neither explained nor needed. Otherwise please add a
comment why this is part of hardware description.
> right? only need: bootargs = "console=hvc0" ?
You should use stdout-path if possible. If not, then only console.
Best regards,
Krzysztof
