linux-kernel - [PATCH 11/14] ARM: dts: stm32: define SCMI resources on stm32mp15

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Date:   Fri, 22 Jan 2021 11:50:58 +0100
From:   <gabriel.fernandez@...s.st.com>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Etienne Carriere <etienne.carriere@...com>,
        Gabriel Fernandez <gabriel.fernandez@...s.st.com>
CC:     <linux-clk@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 11/14] ARM: dts: stm32: define SCMI resources on stm32mp15

From: Gabriel Fernandez <gabriel.fernandez@...s.st.com>

Platform stm32mp15 relies on SCMI resources (clocks and reset domains).
This change adds SCMI resources description in the platform device
tree. SCMI resources uses a mailbox based on some shared memory and
a SMC mailbox notification.

SCMI0 exposes clocks and reset controllers for resources under RCC[TZEN]
configuration control. It is default enabled as SoC default
configuration is RCC[TZEN]=1.

SCMI1 exposes clocks for resources under RCC[MCKPROT] control. The node
is disabled by default as default configuration is RCC[MCKPROT]=0.

Signed-off-by: Etienne Carriere <etienne.carriere@...com>
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...s.st.com>
---
 arch/arm/boot/dts/stm32mp151.dtsi | 50 +++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
index 3c75abacb374..da3647373365 100644
--- a/arch/arm/boot/dts/stm32mp151.dtsi
+++ b/arch/arm/boot/dts/stm32mp151.dtsi
@@ -30,6 +30,56 @@
 		interrupt-parent = <&intc>;
 	};
 
+	scmi_sram: sram@...ff000 {
+		compatible = "mmio-sram";
+		reg = <0x2ffff000 0x1000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0 0x2ffff000 0x1000>;
+
+		scmi0_shm: scmi_shm@0 {
+			reg = <0 0x80>;
+		};
+
+		scmi1_shm: scmi_shm@200 {
+			reg = <0x200 0x80>;
+		};
+	};
+
+	firmware {
+		scmi0: scmi0 {
+			compatible = "arm,scmi-smc";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			arm,smc-id = <0x82002000>;
+			shmem = <&scmi0_shm>;
+
+			scmi0_clk: protocol@14 {
+				reg = <0x14>;
+				#clock-cells = <1>;
+			};
+
+			scmi0_reset: protocol@16 {
+				reg = <0x16>;
+				#reset-cells = <1>;
+			};
+		};
+
+		scmi1: scmi1 {
+			compatible = "arm,scmi-smc";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			arm,smc-id = <0x82002001>;
+			shmem = <&scmi1_shm>;
+			status = "disabled";
+
+			scmi1_clk: protocol@14 {
+				reg = <0x14>;
+				#clock-cells = <1>;
+			};
+		};
+	};
+
 	psci {
 		compatible = "arm,psci-1.0";
 		method = "smc";
-- 
2.17.1