linux-kernel - [PATCH v1 3/4] arm64: dts: rockchip: rk356x: Add MSI controller node

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Message-ID: <20250215235431.143138-4-dmitry.osipenko@collabora.com>
Date: Sun, 16 Feb 2025 02:54:30 +0300
From: Dmitry Osipenko <dmitry.osipenko@...labora.com>
To: Heiko Stuebner <heiko@...ech.de>,
	Marc Zyngier <maz@...nel.org>
Cc: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	devicetree@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Kever Yang <kever.yang@...k-chips.com>,
	XiaoDong Huang <derrick.huang@...k-chips.com>,
	Peter Geis <pgwipeout@...il.com>,
	Robin Murphy <robin.murphy@....com>,
	kernel@...labora.com
Subject: [PATCH v1 3/4] arm64: dts: rockchip: rk356x: Add MSI controller node

Rockchip 356x SoC's GIC has two hardware integration issues that
affect MSI functionality of the GIC. Previously, both these GIC
limitations were worked around by using MBI for MSI instead of ITS
because kernel GIC driver didn't have necessary quirks.

The first limitation is about RK356x GIC not supporting programmable
shareability. Rockchip assigned Errata ID #3568001 for this issue.

Second limitation is about GIC AXI master interface addressing only
first 4GB of DRAM. Rockchip assigned Errata ID #3568002 for this issue.

Now that kernel supports quirks for both of the erratums, add
MSI controller node to RK356x device-tree.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
---
 arch/arm64/boot/dts/rockchip/rk356x-base.dtsi | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi b/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
index 28be38b7182e..423185686600 100644
--- a/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
@@ -284,7 +284,18 @@ gic: interrupt-controller@...00000 {
 		mbi-alias = <0x0 0xfd410000>;
 		mbi-ranges = <296 24>;
 		msi-controller;
+		ranges;
+		#address-cells = <2>;
+		#size-cells = <2>;
 		dma-noncoherent;
+
+		its: msi-controller@...40000 {
+			compatible = "arm,gic-v3-its";
+			reg = <0x0 0xfd440000 0 0x20000>;
+			dma-noncoherent;
+			msi-controller;
+			#msi-cells = <1>;
+		};
 	};
 
 	usb_host0_ehci: usb@...00000 {
-- 
2.48.1