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

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Message-Id: <20201021102855.18026-2-a.fatoum@pengutronix.de>
Date:   Wed, 21 Oct 2020 12:28:56 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Rob Herring <robh+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>
Cc:     kernel@...gutronix.de, Arnaud Pouliquen <arnaud.pouliquen@...com>,
        Ahmad Fatoum <a.fatoum@...gutronix.de>,
        devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] 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@...gutronix.de>
---
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@...09000 {
 		};
 
 		tamp: tamp@...0a000 {
-			compatible = "st,stm32-tamp", "syscon";
+			compatible = "st,stm32-tamp", "syscon", "simple-mfd";
 			reg = <0x5c00a000 0x400>;
 		};
 
-- 
2.28.0