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dt-bindings: arm: stm32: add simple-mfd compatible for tamp node

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The stm32mp1 TAMP (Tamper and backup registers) does tamper detection
and features 32 backup registers that, being in the RTC domain, may
survive even with Vdd switched off.

This makes it suitable for use to communicate a reboot mode from OS
to bootloader via the syscon-reboot-mode binding. Add a "simple-mfd"
to support probing such a child node. The actual reboot mode
node could then be defined in a board.dts or fixed up by the bootloader.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>
This commit is contained in:
Ahmad Fatoum 2020-10-21 12:28:55 +02:00 committed by Alexandre Torgue
parent 4c903a9464
commit 82765d1495
1 changed files with 4 additions and 0 deletions
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4
Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml
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@ -20,6 +20,10 @@ properties:
- st,stm32-syscfg
- st,stm32-power-config
- const: syscon
- items:
- const: st,stm32-tamp
- const: syscon
- const: simple-mfd
reg:
maxItems: 1