[PATCH v3 1/2] dt-bindings: rtc: Add property for Raspberry Pi 5 RTC

Sander Speetjens sander.speetjens at gmail.com
Fri Sep 18 12:33:10 PDT 2026


> On 9/18/26 15:27, Stefan Wahren wrote:
>> Am 18.09.26 um 13:44 schrieb Krzysztof Kozlowski:
>>> On Thu, Sep 17, 2026 at 03:58:40PM +0200, Sander Speetjens wrote:
>>>> Add trickle-voltage-millivolt property for the Raspberry Pi 5 RTC.
>>> Why? Describe the hardware, the need, not the diff.
>> Is this something we can avoid by making this configurable via 
>> userspace / hw_clock --param-set=parameter=value ? 
I think it would be handy to have both.
A cm5 board designer could choose to have a super-cap or lithium ion cell
and for that a device-tree property would be handy for it is always the 
same.
But for a user attachable battery on the pi 5b via headers or soldering
the userspace version would be easier.



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