linux-kernel - [PATCH V2] arm64: dts: imx8mp: Add NPU Node

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Date:   Sun, 22 Oct 2023 11:19:10 -0500
From:   Adam Ford <aford173@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     alexander.stein@...tq-group.com, aford@...conembedded.com,
        Adam Ford <aford173@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V2] arm64: dts: imx8mp: Add NPU Node

The NPU is based on the Vivante GC8000 and its power-domain
is controlled my pgc_mlmix.  Since the power-domain uses
some of these clocks, setup the clock parent and rates
inside the power-domain, and add the NPU node.

The data sheet states the CLK_ML_AHB should be 300MHz for
nominal, but 800MHz clock will divide down to 266 instead.
Boards which operate in over-drive mode should update the
clocks on their boards accordingly.  When the driver loads,
the NPU numerates as:

 etnaviv-gpu 38500000.npu: model: GC8000, revision: 8002

Signed-off-by: Adam Ford <aford173@...il.com>
---

V2:  Move the clock parent and rate assignments to the ppc_mlmix node
     since clock parents should be configured before they are used,
     and pgc_mlmix uses them first.
     Slow the clock rates down to confirm to nominal mode instead of
     overdrive mode.

diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
index c9a610ba4836..a18b9ba98ea2 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
@@ -887,6 +887,15 @@ pgc_mlmix: power-domain@24 {
 						clocks = <&clk IMX8MP_CLK_ML_AXI>,
 							 <&clk IMX8MP_CLK_ML_AHB>,
 							 <&clk IMX8MP_CLK_NPU_ROOT>;
+						assigned-clocks = <&clk IMX8MP_CLK_ML_CORE>,
+								  <&clk IMX8MP_CLK_ML_AXI>,
+								  <&clk IMX8MP_CLK_ML_AHB>;
+						assigned-clock-parents = <&clk IMX8MP_SYS_PLL1_800M>,
+									 <&clk IMX8MP_SYS_PLL1_800M>,
+									 <&clk IMX8MP_SYS_PLL1_800M>;
+						assigned-clock-rates = <800000000>,
+								       <800000000>,
+								       <300000000>;
 					};
 				};
 			};
@@ -2012,6 +2021,18 @@ vpumix_blk_ctrl: blk-ctrl@...30000 {
 			interconnect-names = "g1", "g2", "vc8000e";
 		};
 
+		npu: npu@...00000 {
+			compatible = "vivante,gc";
+			reg = <0x38500000 0x200000>;
+			interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk IMX8MP_CLK_NPU_ROOT>,
+				 <&clk IMX8MP_CLK_NPU_ROOT>,
+				 <&clk IMX8MP_CLK_ML_AXI>,
+				 <&clk IMX8MP_CLK_ML_AHB>;
+			clock-names = "core", "shader", "bus", "reg";
+			power-domains = <&pgc_mlmix>;
+		};
+
 		gic: interrupt-controller@...00000 {
 			compatible = "arm,gic-v3";
 			reg = <0x38800000 0x10000>,
-- 
2.40.1