Re: [PATCH] arm64: tegra: Enable built-in RTC on Jetson AGX Thor

[Jon Hunter <jonathanh@nvidia.com>]

On 18/08/2026 11:54, Thierry Reding wrote:
> On Mon, Aug 17, 2026 at 03:41:31PM +0100, Jon Hunter wrote:
>>
>> On 17/08/2026 15:32, Thierry Reding wrote:
>>> From: Thierry Reding <treding@nvidia.com>
>>>
>>> The built-in RTC is mostly useful for testing suspend/resume cycles.
>>>
>>> Signed-off-by: Thierry Reding <treding@nvidia.com>
>>> ---
>>>    arch/arm64/boot/dts/nvidia/tegra264-p4071-0000+p3834.dtsi | 6 ++++++
>>>    1 file changed, 6 insertions(+)
>>>
>>> diff --git a/arch/arm64/boot/dts/nvidia/tegra264-p4071-0000+p3834.dtsi b/arch/arm64/boot/dts/nvidia/tegra264-p4071-0000+p3834.dtsi
>>> index c4ba3322ed9a..113ecf297378 100644
>>> --- a/arch/arm64/boot/dts/nvidia/tegra264-p4071-0000+p3834.dtsi
>>> +++ b/arch/arm64/boot/dts/nvidia/tegra264-p4071-0000+p3834.dtsi
>>> @@ -13,6 +13,12 @@ chosen {
>>>    		stdout-path = "serial0:115200n8";
>>>    	};
>>> +	bus@0 {
>>> +		rtc@c2c0000 {
>>> +			status = "okay";
>>> +		};
>>> +	};
>>> +
>>
>>
>> Any reason we should not just enable in tegra264.dtsi by default? I see that
>> we do that for tegra234.
> 
> This is more of a development type of option and not everybody may want
> to have it enabled, especially since it's not always hooked up to do
> anything useful. We commonly use it on the devkit for suspend/resume
> testing, so it's useful there, but even then there's usually another RTC
> on a PMIC or something that's considered the primary one.
> 
> So in production I suspect people may not want to enable the built-in
> RTC. If we enabled it by default, then people would have to explicitly
> disable it again.
> 
> I don't feel very strongly either way, and I could easily be swayed.

I would be good to get this added. I don't have strong feelings either
way. So ...

Tested-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>

Thanks!
Jon

-- 
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