i.MX8QXP is an ARMv8 Cortex-A35 SoC with a Cortex-M4 system controller inside, the system controller manages overall power, clock, secure RTC and watchdog etc., so Linux kernel running on A35 needs to communicate with system controller for watchdog operation, this system controller watchdog will call SMC to trap to EL3 secure world ARM-Trusted-Firmware and then it will request system controller to do the watchdog operation via IPC. Changes since V8: - change the timeout value to be from DT instead of from module parameter, and also update the binding doc and dts to add timeout property. Anson Huang (4): dt-bindings: watchdog: add i.MX system controller watchdog watchdog: imx_sc: Add i.MX system controller watchdog support arm64: defconfig: add support for i.MX system controller watchdog arm64: dts: imx8qxp: add system controller watchdog support .../bindings/watchdog/fsl-imx-sc-wdt.txt | 24 +++ arch/arm64/boot/dts/freescale/imx8qxp.dtsi | 5 + arch/arm64/configs/defconfig | 1 + drivers/watchdog/Kconfig | 16 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/imx_sc_wdt.c | 177 +++++++++++++++++++++ 6 files changed, 224 insertions(+) create mode 100644 Documentation/devicetree/bindings/watchdog/fsl-imx-sc-wdt.txt create mode 100644 drivers/watchdog/imx_sc_wdt.c -- 2.7.4
