target/linux/bcm27xx/patches-6.1/950-1225-ARM-dts-bcm2712-rpi-5-b-Allow-RTC-to-be-disabled.patch

   1 From da5fd98469edd797ed77d9a8690a608c6b54f9e6 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Tue, 19 Dec 2023 14:55:21 +0000
   4 Subject: [PATCH] ARM: dts: bcm2712-rpi-5-b: Allow RTC to be disabled
   5
   6 Add a dtparam "rtc", so that "dtparam=rtc=off" can be used to disable
   7 the Pi 5's onboard RTC.
   8
   9 See: https://forums.raspberrypi.com/viewtopic.php?t=361813
  10
  11 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  12 ---
  13  arch/arm/boot/dts/bcm2712-rpi-5-b.dts | 1 +
  14  arch/arm/boot/dts/overlays/README     | 3 +++
  15  2 files changed, 4 insertions(+)
  16
  17 --- a/arch/arm/boot/dts/bcm2712-rpi-5-b.dts
  18 +++ b/arch/arm/boot/dts/bcm2712-rpi-5-b.dts
  19 @@ -819,6 +819,7 @@ spi10_cs_pins: &spi10_cs_gpio1 {};
  20                 pciex1_tperst_clk_ms = <&pciex1>, "brcm,tperst-clk-ms:0";
  21                 pcie_tperst_clk_ms = <&pciex1>, "brcm,tperst-clk-ms:0";
  22                 random = <&random>, "status";
  23 +               rtc = <&rpi_rtc>, "status";
  24                 rtc_bbat_vchg = <&rpi_rtc>, "trickle-charge-microvolt:0";
  25                 spi = <&spi0>, "status";
  26                 suspend = <&pwr_key>, "linux,code:0=205";
  27 --- a/arch/arm/boot/dts/overlays/README
  28 +++ b/arch/arm/boot/dts/overlays/README
  29 @@ -307,6 +307,9 @@ Params:
  30          random                  Set to "on" to enable the hardware random
  31                                  number generator (default "on")
  32
  33 +        rtc                     Set to "off" to disable the onboard Real Time
  34 +                                Clock (2712 only, default "on")
  35 +
  36          rtc_bbat_vchg           Set the RTC backup battery charging voltage in
  37                                  microvolts. If set to 0 or not specified, the
  38                                  trickle charger is disabled.