2023-10-19 02:23:47

by Adam Ford

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

The NPU is based on the Vivante GC8000 and it enumerates as

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

Signed-off-by: Adam Ford <[email protected]>

diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
index c9a610ba4836..1ef8d17726ac 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
@@ -2012,6 +2012,25 @@ vpumix_blk_ctrl: blk-ctrl@38330000 {
interconnect-names = "g1", "g2", "vc8000e";
};

+ npu: npu@38500000 {
+ compatible = "vivante,gc";
+ reg = <0x38500000 0x20000>;
+ 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";
+ assigned-clocks = <&clk IMX8MP_CLK_ML_CORE>,
+ <&clk IMX8MP_CLK_ML_AXI>,
+ <&clk IMX8MP_CLK_ML_AHB>;
+ assigned-clock-parents = <&clk IMX8MP_SYS_PLL2_1000M>,
+ <&clk IMX8MP_SYS_PLL1_800M>,
+ <&clk IMX8MP_SYS_PLL1_800M>;
+ assigned-clock-rates = <1000000000>, <800000000>, <400000000>;
+ power-domains = <&pgc_mlmix>;
+ };
+
gic: interrupt-controller@38800000 {
compatible = "arm,gic-v3";
reg = <0x38800000 0x10000>,
--
2.40.1

2023-10-19 06:11:46

by Alexander Stein

Subject: Re: [PATCH] arm64: dts: imx8mp: Add NPU Node

Hi Adam,

thanks for the patch I tried a similar one.

Am Donnerstag, 19. Oktober 2023, 04:23:00 CEST schrieb Adam Ford:
> The NPU is based on the Vivante GC8000 and it enumerates as
>
> etnaviv-gpu 38500000.npu: model: GC8000, revision: 8002
>
> Signed-off-by: Adam Ford <[email protected]>
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> b/arch/arm64/boot/dts/freescale/imx8mp.dtsi index
> c9a610ba4836..1ef8d17726ac 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> @@ -2012,6 +2012,25 @@ vpumix_blk_ctrl: blk-ctrl@38330000 {
> interconnect-names = "g1", "g2", "vc8000e";
> };
>
> + npu: npu@38500000 {
> + compatible = "vivante,gc";
> + reg = <0x38500000 0x20000>;

Do you have some more information about the actual memory range? RM says 2MiB,
but NPU memory map lists up to 0x664.

> + 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";
> + assigned-clocks = <&clk IMX8MP_CLK_ML_CORE>,
> + <&clk IMX8MP_CLK_ML_AXI>,
> + <&clk IMX8MP_CLK_ML_AHB>;
> + assigned-clock-parents = <&clk
IMX8MP_SYS_PLL2_1000M>,
> + <&clk
IMX8MP_SYS_PLL1_800M>,
> + <&clk
IMX8MP_SYS_PLL1_800M>;
> + assigned-clock-rates = <1000000000>,
<800000000>, <400000000>;

1GHz for ML_CLK_ROOT is only available in overdrive mode, 800MHz in nominal
mode. See datasheet IMX8MPIEC Rev 2.1. I don't think it's a good idea to
configure for overdrive mode by default.
Same goes for CLK_ML_AHB regarding 400 vs. 300 MHz.

Best regards,
Alexander

> + power-domains = <&pgc_mlmix>;
> + };
> +
> gic: interrupt-controller@38800000 {
> compatible = "arm,gic-v3";
> reg = <0x38800000 0x10000>,


--
TQ-Systems GmbH | M?hlstra?e 2, Gut Delling | 82229 Seefeld, Germany
Amtsgericht M?nchen, HRB 105018
Gesch?ftsf?hrer: Detlef Schneider, R?diger Stahl, Stefan Schneider
http://www.tq-group.com/

2023-10-19 12:32:29

by Adam Ford

Subject: Re: [PATCH] arm64: dts: imx8mp: Add NPU Node

On Thu, Oct 19, 2023 at 1:00 AM Alexander Stein
<[email protected]> wrote:
>
> Hi Adam,
>
> thanks for the patch I tried a similar one.
>
> Am Donnerstag, 19. Oktober 2023, 04:23:00 CEST schrieb Adam Ford:
> > The NPU is based on the Vivante GC8000 and it enumerates as
> >
> > etnaviv-gpu 38500000.npu: model: GC8000, revision: 8002
> >
> > Signed-off-by: Adam Ford <[email protected]>
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > b/arch/arm64/boot/dts/freescale/imx8mp.dtsi index
> > c9a610ba4836..1ef8d17726ac 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > @@ -2012,6 +2012,25 @@ vpumix_blk_ctrl: blk-ctrl@38330000 {
> > interconnect-names = "g1", "g2", "vc8000e";
> > };
> >
> > + npu: npu@38500000 {
> > + compatible = "vivante,gc";
> > + reg = <0x38500000 0x20000>;
>
> Do you have some more information about the actual memory range? RM says 2MiB,
> but NPU memory map lists up to 0x664.

I do not. The RM lists 3850_0000 - 386F_FFFF, so I should have put an
extra 0 in there. Sorry about that. I will fix in the next rev.
>
> > + 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";
> > + assigned-clocks = <&clk IMX8MP_CLK_ML_CORE>,
> > + <&clk IMX8MP_CLK_ML_AXI>,
> > + <&clk IMX8MP_CLK_ML_AHB>;
> > + assigned-clock-parents = <&clk
> IMX8MP_SYS_PLL2_1000M>,
> > + <&clk
> IMX8MP_SYS_PLL1_800M>,
> > + <&clk
> IMX8MP_SYS_PLL1_800M>;
> > + assigned-clock-rates = <1000000000>,
> <800000000>, <400000000>;
>
> 1GHz for ML_CLK_ROOT is only available in overdrive mode, 800MHz in nominal
> mode. See datasheet IMX8MPIEC Rev 2.1. I don't think it's a good idea to
> configure for overdrive mode by default.

You are right. I looked at the clocking from the downstream tree to
see what their clocks were, and it didn't occur to me to double check
against the datasheet.

> Same goes for CLK_ML_AHB regarding 400 vs. 300 MHz.

I'll update both and submit a V2.

adam
>
> Best regards,
> Alexander
>
> > + power-domains = <&pgc_mlmix>;
> > + };
> > +
> > gic: interrupt-controller@38800000 {
> > compatible = "arm,gic-v3";
> > reg = <0x38800000 0x10000>,
>
>
> --
> TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany
> Amtsgericht München, HRB 105018
> Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider
> http://www.tq-group.com/
>
>