target/linux/bcm27xx/patches-6.1/950-0920-dt-bindings-rtc-new-binding-for-Raspberry-Pi-RTC-dri.patch

   1 From ff2c2f67689e10ad66c1e33ae6a7552d82ac983c Mon Sep 17 00:00:00 2001
   2 From: Dom Cobley <popcornmix@gmail.com>
   3 Date: Fri, 7 Jul 2023 20:16:06 +0100
   4 Subject: [PATCH] dt-bindings: rtc: new binding for Raspberry Pi RTC driver
   5
   6 Add binding for the new RTC driver for Raspberry Pi.
   7 This platform has an RTC managed by firmware, and this RTC
   8 driver provides the simple mailbox interface to access it.
   9
  10 Signed-off-by: Dom Cobley <popcornmix@gmail.com>
  11 ---
  12  .../devicetree/bindings/rtc/rtc-rpi.txt         | 17 +++++++++++++++++
  13  1 file changed, 17 insertions(+)
  14  create mode 100644 Documentation/devicetree/bindings/rtc/rtc-rpi.txt
  15
  16 --- /dev/null
  17 +++ b/Documentation/devicetree/bindings/rtc/rtc-rpi.txt
  18 @@ -0,0 +1,17 @@
  19 +* Raspberry Pi RTC
  20 +
  21 +This is a Linux interface to an RTC managed by firmware, hence it's
  22 +virtual from a Linux perspective.
  23 +
  24 +The interface uses the firmware mailbox api to access the RTC registers.
  25 +
  26 +Required properties:
  27 +compatible: should be "raspberrypi,rpi-rtc"
  28 +firmware:   Reference to the RPi firmware device node.
  29 +
  30 +Example:
  31 +
  32 +       rpi_rtc: rpi_rtc {
  33 +               compatible = "raspberrypi,rpi-rtc";
  34 +               firmware = <&firmware>;
  35 +       };