linux-kernel - [RFC PATCH v1 12/14] riscv: dts: Add Video Output clock and syscon regmap nodes

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Message-Id: <20241203134137.2114847-13-m.wilczynski@samsung.com>
Date: Tue,  3 Dec 2024 14:41:35 +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, 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 v1 12/14] riscv: dts: Add Video Output clock and syscon
 regmap nodes

The address space controlling the Video Output (VO) subsystem clocks
also contains control registers for GPU resets. To properly synchronize
access to this shared address space, create a syscon Device Tree node
for the VO registers and reference it in the clock controller node.

This change ensures coordinated access to the VO registers between the
clock controller and other drivers, preventing conflicts and maintaining
system stability.

Signed-off-by: Michal Wilczynski <m.wilczynski@...sung.com>
---
 arch/riscv/boot/dts/thead/th1520.dtsi | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi b/arch/riscv/boot/dts/thead/th1520.dtsi
index dc2d554b4a71..39d39059160d 100644
--- a/arch/riscv/boot/dts/thead/th1520.dtsi
+++ b/arch/riscv/boot/dts/thead/th1520.dtsi
@@ -489,6 +489,18 @@ clk: clock-controller@...f010000 {
 			#clock-cells = <1>;
 		};
 
+		vosys_clk: clock-controller {
+			compatible = "thead,th1520-clk-vo";
+			thead,vosys-regmap = <&vosys_reg>;
+			#clock-cells = <1>;
+		};
+
+		vosys_reg: vosys@...f528000 {
+			compatible = "thead,th1520-vosys", "syscon";
+			reg = <0xff 0xef528000 0x0 0x1000>;
+			status = "okay";
+		};
+
 		dmac0: dma-controller@...fc00000 {
 			compatible = "snps,axi-dma-1.01a";
 			reg = <0xff 0xefc00000 0x0 0x1000>;
-- 
2.34.1