linux-kernel - [PATCH v2 4/4] ARM: dts: stm32: update stm32mp151 for remote proc synchronization support

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Date:   Wed, 14 Oct 2020 14:54:41 +0200
From:   Arnaud Pouliquen <arnaud.pouliquen@...com>
To:     Rob Herring <robh@...nel.org>,
        Alexandre Torgue <alexandre.torgue@...com>
CC:     <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Arnaud Pouliquen <arnaud.pouliquen@...com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ahmad Fatoum <a.fatoum@...gutronix.de>
Subject: [PATCH v2 4/4] ARM: dts: stm32: update stm32mp151 for remote proc synchronization support

Two backup registers are used to store the Cortex-M4 state and the resource
table address.
Declare the tamp node and add associated properties in m4_rproc node
to allow Linux to attach to a firmware loaded by the first boot stages.

Associated driver implementation is available in commit 9276536f455b3
("remoteproc: stm32: Parse syscon that will manage M4 synchronisation").

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...com>
---
 arch/arm/boot/dts/stm32mp151.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
index bfe29023fbd5..842ecffae73a 100644
--- a/arch/arm/boot/dts/stm32mp151.dtsi
+++ b/arch/arm/boot/dts/stm32mp151.dtsi
@@ -1541,6 +1541,11 @@
 			status = "disabled";
 		};
 
+		tamp: tamp@...0a000 {
+			compatible = "st,stm32-tamp", "syscon";
+			reg = <0x5c00a000 0x400>;
+		};
+
 		/*
 		 * Break node order to solve dependency probe issue between
 		 * pinctrl and exti.
@@ -1717,6 +1722,8 @@
 			st,syscfg-holdboot = <&rcc 0x10C 0x1>;
 			st,syscfg-tz = <&rcc 0x000 0x1>;
 			st,syscfg-pdds = <&pwr_mcu 0x0 0x1>;
+			st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>;
+			st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>;
 			status = "disabled";
 		};
 	};
-- 
2.17.1