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Subject[PATCH v6 0/5] add meson secure watchdog driver
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.

Changes since v5 at [4]:
- take the wdt node as child node of secure-monitor
- update dt-binding description
- invoke of_platform_default_populate() instantiate wdt device according to Rob's suggestion at [5]
- find the secure-monitor node through the wdt parent node instead of of_find_compatible_node()
- add Guenter's Reviewed-by

Changes since v4 at [3]:
- add watchdog node in dts, and introduce a new optional property "timeout-sec"
- add dt-binding for meson secure watchdog
- instantiate wdt device through dts node instead of platform_device_register_simple()

Changes 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


Xingyu Chen (5):
firmware: meson_sm: add new SMC ID support for accessing secure
firmware: meson_sm: populate platform device based on the child node
dt-bindings: watchdog: add new binding for meson secure watchdog
watchdog: add meson secure watchdog driver
arm64: dts: a1: add secure watchdog controller

.../bindings/watchdog/amlogic,meson-sec-wdt.yaml | 40 +++++
arch/arm64/boot/dts/amlogic/meson-a1.dtsi | 6 +
drivers/firmware/meson/meson_sm.c | 3 +
drivers/watchdog/Kconfig | 16 ++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/meson_sec_wdt.c | 185 +++++++++++++++++++++
include/linux/firmware/meson/meson_sm.h | 1 +
7 files changed, 252 insertions(+)
create mode 100644 Documentation/devicetree/bindings/watchdog/amlogic,meson-sec-wdt.yaml
create mode 100644 drivers/watchdog/meson_sec_wdt.c


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