The watchdog controller on the Meson-A/C series SoCs is moved to secure world, We have to call SMC instruction to trap the ATF for watchdog operation. These operations are different from previous SoCs, so we introduce a new watchdog driver to support this kind of SoCs. Chnages since v3 at [2]: - add SM_A1_ prefix for WATCHDOG_OPS - remove phandle to secure-monitor node - remove watchdog node from dts, and register wdt device by platform_device_register_simple() - remove dt-binding for meson secure watchdog - use the msec as unit of timeout parameter which is passed to fw side Changes since v2 at [1]: - remove useless dependency in Kconfig - return zero when getting left time value fails Changes since v1 at [0]: - add a new dependency in Kconfig - simplify/add the return operation - remove useless ping operation when setting the timeout - fix some return values - fix the license statement [0]:https://lore.kernel.org/linux-amlogic/1570874721-36077-1-git-send-email-xingyu.chen@xxxxxxxxxxx [1]:https://lore.kernel.org/linux-amlogic/1571387622-35132-1-git-send-email-xingyu.chen@xxxxxxxxxxx [2]:https://lore.kernel.org/linux-amlogic/1571983984-11771-1-git-send-email-xingyu.chen@xxxxxxxxxxx Xingyu Chen (2): firmware: meson_sm: add new SMC ID support for accessing secure watchdog watchdog: add meson secure watchdog driver drivers/firmware/meson/meson_sm.c | 1 + drivers/watchdog/Kconfig | 16 +++ drivers/watchdog/Makefile | 1 + drivers/watchdog/meson_sec_wdt.c | 207 ++++++++++++++++++++++++++++++++ include/linux/firmware/meson/meson_sm.h | 1 + 5 files changed, 226 insertions(+) create mode 100644 drivers/watchdog/meson_sec_wdt.c -- 2.7.4
