linux-kernel - [RFC PATCH v2 17/19] riscv: dts: thead: Introduce power domain nodes with aon firmware

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Message-Id: <20241223125553.3527812-18-m.wilczynski@samsung.com>
Date: Mon, 23 Dec 2024 13:55:51 +0100
From: Michal Wilczynski <m.wilczynski@...sung.com>
To: mturquette@...libre.com, sboyd@...nel.org, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, drew@...7.com, guoren@...nel.org,
	wefu@...hat.com, jassisinghbrar@...il.com, paul.walmsley@...ive.com,
	palmer@...belt.com, aou@...s.berkeley.edu, frank.binns@...tec.com,
	matt.coster@...tec.com, maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com, simona@...ll.ch,
	ulf.hansson@...aro.org, jszhang@...nel.org, p.zabel@...gutronix.de,
	m.szyprowski@...sung.com
Cc: linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org, linux-pm@...r.kernel.org, Michal Wilczynski
	<m.wilczynski@...sung.com>
Subject: [RFC PATCH v2 17/19] riscv: dts: thead: Introduce power domain
 nodes with aon firmware

The DRM Imagination GPU requires a power-domain driver. In the T-HEAD
TH1520 SoC implements power management capabilities through the E902
core, which can be communicated with through the mailbox, using firmware
protocol.

Add AON node, as a parent for the power-domain controller.

Signed-off-by: Michal Wilczynski <m.wilczynski@...sung.com>
---
 arch/riscv/boot/dts/thead/th1520.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi b/arch/riscv/boot/dts/thead/th1520.dtsi
index 0993de0cdd44..d4090074fd27 100644
--- a/arch/riscv/boot/dts/thead/th1520.dtsi
+++ b/arch/riscv/boot/dts/thead/th1520.dtsi
@@ -6,6 +6,7 @@
 
 #include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/clock/thead,th1520-clk-ap.h>
+#include <dt-bindings/power/thead,th1520-power.h>
 
 / {
 	compatible = "thead,th1520";
@@ -229,6 +230,19 @@ stmmac_axi_config: stmmac-axi-config {
 		snps,blen = <0 0 64 32 0 0 0>;
 	};
 
+	firmware {
+		aon: aon {
+			compatible = "thead,th1520-aon";
+			mboxes = <&mbox_910t 1>;
+			mbox-names = "aon";
+
+			pd: power-domain {
+				compatible = "thead,th1520-pd";
+				#power-domain-cells = <1>;
+			};
+		};
+	};
+
 	soc {
 		compatible = "simple-bus";
 		interrupt-parent = <&plic>;
-- 
2.34.1