On Wed, Oct 21, 2020 at 12:28:55PM +0200, Ahmad Fatoum wrote: > 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. 'simple-mfd' implies there is no dependency on the parent node for the child (such as the regmap perhaps). Is that the case here? > > Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx> > --- > v1 available here: > https://lore.kernel.org/linux-arm-kernel/20200916142216.25142-1-a.fatoum@xxxxxxxxxxxxxx/ > > v1 -> v2: > - new patch, rebased on top of > https://lore.kernel.org/r/20201014125441.2457-1-arnaud.pouliquen@xxxxxx > --- > .../devicetree/bindings/arm/stm32/st,stm32-syscon.yaml | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml b/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml > index 6634b3e0853e..4684017a42e4 100644 > --- a/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml > +++ b/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml > @@ -19,8 +19,11 @@ properties: > - st,stm32mp151-pwr-mcu > - st,stm32-syscfg > - st,stm32-power-config > - - st,stm32-tamp > - const: syscon > + - items: > + - const: st,stm32-tamp > + - const: syscon > + - const: simple-mfd > > reg: > maxItems: 1 > -- > 2.28.0 >
