Re: [PATCH v17 09/12] arm64: dts: qcom: qcs6490-rb3gen2: Add PSCI SYSTEM_RESET2 types

[Shivendra Pratap <shivendra.pratap@oss.qualcomm.com>]

On 11/12/2025 4:45 PM, Mukesh Ojha wrote:
> On Tue, Nov 11, 2025 at 10:52:34AM -0600, Bjorn Andersson wrote:
>> On Mon, Nov 10, 2025 at 09:49:50PM +0530, Mukesh Ojha wrote:
>>> On Mon, Nov 10, 2025 at 09:30:26AM -0600, Bjorn Andersson wrote:
>>>> On Mon, Nov 10, 2025 at 05:58:24PM +0530, Mukesh Ojha wrote:
>>>>> On Sun, Nov 09, 2025 at 08:07:22PM +0530, Shivendra Pratap wrote:
>>>>>> From: Elliot Berman <elliot.berman@oss.qualcomm.com>
>>>>>>
>>>>>> Add support for SYSTEM_RESET2 vendor-specific resets in
>>>>>> qcs6490-rb3gen2 as reboot-modes.  Describe the resets:
>>>>>> "bootloader" will cause device to reboot and stop in the
>>>>>> bootloader's fastboot mode. "edl" will cause device to reboot
>>>>>> into "emergency download mode", which permits loading images via
>>>>>> the Firehose protocol.
>>>>>>
>>>>>> Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
>>>>>> Signed-off-by: Elliot Berman <elliot.berman@oss.qualcomm.com>
>>>>>> Signed-off-by: Shivendra Pratap <shivendra.pratap@oss.qualcomm.com>
>>>>>> ---
>>>>>>  arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 7 +++++++
>>>>>>  1 file changed, 7 insertions(+)
>>>>>>
>>>>>> diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
>>>>>> index 721a26d49ccaeb1429e2cc1c3a5c8d9517da3be6..cebdedd5d614b9efb6dfbee91dd67f3c3e322a38 100644
>>>>>> --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
>>>>>> +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
>>>>>> @@ -935,6 +935,13 @@ &pon_resin {
>>>>>>  	status = "okay";
>>>>>>  };
>>>>>>  
>>>>>> +&psci {
>>>>>> +	reboot-mode {
>>>>>> +		mode-bootloader = <0x10001 0x2>;
>>>>>> +		mode-edl = <0 0x1>;
>>>>>> +	};
>>>>>> +};
>>>>>> +
>>>>>
>>>>> Make sense for this as it leverages sc7280 and adding it there would not
>>>>> have made sense.
>>>>>
>>>>
>>>> Why wouldn't it make sense?
>>>
>>> It is better to add for platforms we know their firmware support this
>>> from day1 and not add for something like chrome or any other variant of
>>> sc7280 where this support would never come or not tested.
>>
>> So SYSTEM_RESET2 only exist in newer firmware versions and hence this
>> isn't (and won't be) broadly available in SC7280 devices.
>>
>> That would be excellent information to put in the commit message, so
>> others writing Kodiak dts doesn't feel the urge to copy this and debug
>> why it doesn't work.
> 
> Sure, @shivendra please add this information in commit text.

Ack.

> 
>>
>>>>
>>>>> Acked-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
>>>>>
>>>>
>>>> Please read submitting-patches.rst about Acked-by, and use Reviewed-by
>>>> going forward.
>>>
>>> I was acking the idea of this particular change in platform file compared to
>>> other patches, if above reason looks fine, can be converted to R-by.
>>>
>>
>> That's appreciated, but per the documentation, the meaning of acked-by
>> is different.
> 
> Sure..
> 
>>
>> Regards,
>> Bjorn
>>
>>>>
>>>> Regards,
>>>> Bjorn
>>>>
>>>>>>  &qup_uart7_cts {
>>>>>>  	/*
>>>>>>  	 * Configure a bias-bus-hold on CTS to lower power
>>>>>>
>>>>>> -- 
>>>>>> 2.34.1
>>>>>>
>>>>>
>>>>> -- 
>>>>> -Mukesh Ojha
>>>>>
>>>
>>> -- 
>>> -Mukesh Ojha
>