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ARM: dts: stm32: support child mfd cells for the stm32mp1 TAMP syscon 

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@pengutronix.de>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>
zero-sugar-mainline-defconfig
Ahmad Fatoum 2020-10-21 12:28:56 +02:00 committed by Alexandre Torgue
parent 82765d1495
commit b19d3a55d4
1 changed files with 1 additions and 1 deletions
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2
arch/arm/boot/dts/stm32mp151.dtsi
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@ -1574,7 +1574,7 @@
};
tamp: tamp@5c00a000 {
compatible = "st,stm32-tamp", "syscon";
compatible = "st,stm32-tamp", "syscon", "simple-mfd";
reg = <0x5c00a000 0x400>;
};