[PATCH v2 2/2] ARM: dts: stm32: support child mfd cells for the stm32mp1 TAMP syscon

[Ahmad Fatoum]

The stm32mp1 TAMP peripheral has 32 backup registers that survive
a warm reset. This makes them suitable for storing a reboot
mode, which the vendor's kernel tree is already doing[0].

The actual syscon-reboot-mode child node can be added by a board.dts or
fixed up by the bootloader. For the child node to be probed, the
compatible needs to include simple-mfd. The binding now specifies this,
so have the SoC dtsi adhere to it.

[0]: https://github.com/STMicroelectronics/linux/commit/2e9bfc29dd

Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
v1 -> v2:
  - Dropped simple-bus. simple-mfd is all that's needed
  - reworded commit message
---
 arch/arm/boot/dts/stm32mp151.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
index 842ecffae73a..662c2408d41b 100644
--- a/arch/arm/boot/dts/stm32mp151.dtsi
+++ b/arch/arm/boot/dts/stm32mp151.dtsi
@@ -1542,7 +1542,7 @@ i2c6: i2c@5c009000 {
 		};
 
 		tamp: tamp@5c00a000 {
-			compatible = "st,stm32-tamp", "syscon";
+			compatible = "st,stm32-tamp", "syscon", "simple-mfd";
 			reg = <0x5c00a000 0x400>;
 		};
 
-- 
2.28.0