NXP i.MX8QXP is an ARMv8 SoC with a Cortex-M4 core inside as system controller, the system controller is in charge of system power, clock and secure RTC etc. management, Linux kernel has to communicate with system controller via MU (message unit) IPC to do RTC operation. Since the RTC set time MUST to be done in secure EL3 mode (required by system controller firmware) and ALARM functions needs to be done with general MU IRQ handle, these are NOT ready NOW, so this patch ONLY supports RTC read time for now. Note that this patch set is based on [V4,5/5] defconfig: arm64: add imx8qxp support, https://patchwork.kernel.org/patch/10677315/ Anson Huang (4): rtc: add i.MX system controller RTC support dt-bindings: rtc: add binding doc for i.MX system controller RTC driver defconfig: arm64: add i.MX system controller RTC support ARM64: dts: imx: add i.MX8QXP system controller RTC support .../devicetree/bindings/rtc/rtc-imx-sc.txt | 10 ++ arch/arm64/boot/dts/freescale/imx8qxp.dtsi | 4 + arch/arm64/configs/defconfig | 1 + drivers/rtc/Kconfig | 6 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-imx-sc.c | 104 +++++++++++++++++++++ 6 files changed, 126 insertions(+) create mode 100644 Documentation/devicetree/bindings/rtc/rtc-imx-sc.txt create mode 100644 drivers/rtc/rtc-imx-sc.c -- 2.7.4
