linux-kernel - [PATCH] ARM: dts: stm32: declare device tree syscon node for TAMP peripheral

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Date:   Wed, 16 Sep 2020 16:22:16 +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:     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] ARM: dts: stm32: declare device tree syscon node for TAMP peripheral

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.

We don't have a driver for the peripheral, but handling it as syscon
allows using it with existing drivers that work with them, in particular
a syscon-reboot-mode child node can be defined in board.dts (or fixed up
by the bootloader) to exchange reboot mode information with the bootloader.

Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
---
 arch/arm/boot/dts/stm32mp151.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
index bfe29023fbd5..fa4eb96c95af 100644
--- a/arch/arm/boot/dts/stm32mp151.dtsi
+++ b/arch/arm/boot/dts/stm32mp151.dtsi
@@ -1144,6 +1144,11 @@ syscfg: syscon@...20000 {
 			clocks = <&rcc SYSCFG>;
 		};
 
+		tamp: tamp@...0a000 {
+			compatible = "simple-bus", "syscon", "simple-mfd";
+			reg = <0x5c00a000 0x400>;
+		};
+
 		lptimer2: timer@...21000 {
 			#address-cells = <1>;
 			#size-cells = <0>;
-- 
2.28.0