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dt-bindings: rtc: new binding for Raspberry Pi RTC driver

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Add binding for the new RTC driver for Raspberry Pi.
This platform has an RTC managed by firmware, and this RTC
driver provides the simple mailbox interface to access it.

Signed-off-by: Dom Cobley <popcornmix@gmail.com>

dt: bindings: update rpi-rtc binding

Add property for bcm2712 firmware RTC driver charger control

Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
This commit is contained in:
Dom Cobley
2023-07-07 20:16:06 +01:00
parent 7aa53aea95
commit 1e42858be1
1 changed files with 22 additions and 0 deletions
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Documentation/devicetree/bindings/rtc/rtc-rpi.txt Normal file
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* Raspberry Pi RTC
This is a Linux interface to an RTC managed by firmware, hence it's
virtual from a Linux perspective.
The interface uses the firmware mailbox api to access the RTC registers.
Required properties:
compatible: should be "raspberrypi,rpi-rtc"
firmware: Reference to the RPi firmware device node.
Optional property:
trickle-charge-microvolt: specify a trickle charge voltage for the backup
battery in microvolts.
Example:
rpi_rtc: rpi_rtc {
compatible = "raspberrypi,rpi-rtc";
firmware = <&firmware>;
trickle-charge-microvolt = <3000000>;
};