[PATCH V2] arm64: dts: imx8mp: Add NPU Node

Adam Ford
2023-10-22T16:19:53Z

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@gmail.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@38330000 {
interconnect-names = "g1", "g2", "vc8000e";
};

+ npu: npu@38500000 {
+ 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@38800000 {
compatible = "arm,gic-v3";
reg = <0x38800000 0x10000>,
--
2.40.1