[PATCH v14 0/3] Raspberry Pi 5 RTC driver

[Alexandre Belloni]

On Sun, 18 Oct 2026 17:10:53 +0200, Sander Speetjens wrote:
> The Raspberry Pi 5 has a battery-backed RTC located
> on the DA9091 PMIC accessed via the I2C bus[1].
> Access to the RTC is provided exclusively through the VideoCore firmware
> mailbox interface (not via a direct I2C register interface).
> 
> As stated by jamesh on the Rasperry Pi forum [2],
> "There are no plans to release a public datasheet for the DA9091."
> So we are stuck with the firmware interface for now.
> PhilE also states that "The firmware needs full control of the DA9091,
> sometimes with extremely low latency,
> otherwise there's a risk the supply could just cut the power."
> 
> [...]

Applied, thanks!

[1/3] dt-bindings: rtc: Add missing type to trickle-voltage-millivolt
      https://git.kernel.org/abelloni/c/09399a7cd932
[2/3] dt-bindings: rtc: Add property for Raspberry Pi 5 RTC
      https://git.kernel.org/abelloni/c/58db0fbeef2a
[3/3] rtc: Add Raspberry Pi 5 RTC driver
      https://git.kernel.org/abelloni/c/dba67294e215

Best regards,

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com