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