linux-kernel - Re: [PATCH v6 4/8] arm64: dts: Add DT node for the VIPNano-QI on the A311D

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Message-ID: <5e5babae-224d-51cf-4eac-6272df87a8e7@linaro.org>
Date:   Mon, 2 Jan 2023 10:53:52 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:     italonicola@...labora.com, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/Amlogic Meson SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Amlogic Meson SoC support" 
        <linux-amlogic@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 4/8] arm64: dts: Add DT node for the VIPNano-QI on the
 A311D

On 02/12/2022 12:52, Tomeu Vizoso wrote:
> This "NPU" is very similar to the Vivante GPUs and Etnaviv works well
> with it with just a few small changes.
> 
> v2: Add reference to RESET_NNA (Neil)
> v3: Fix indentation (Neil)
> 
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
> Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>   arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi     | 11 +++++++++++
>   .../boot/dts/amlogic/meson-g12b-a311d-khadas-vim3.dts |  4 ++++
>   2 files changed, 15 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
> index 45947c1031c4..61c8461df614 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
> @@ -11,6 +11,7 @@
>   #include <dt-bindings/interrupt-controller/arm-gic.h>
>   #include <dt-bindings/reset/amlogic,meson-g12a-reset.h>
>   #include <dt-bindings/thermal/thermal.h>
> +#include <dt-bindings/power/meson-g12a-power.h>
>   
>   / {
>   	interrupt-parent = <&gic>;
> @@ -2484,4 +2485,14 @@ xtal: xtal-clk {
>   		#clock-cells = <0>;
>   	};
>   
> +	npu: npu@...00000 {
> +		compatible = "vivante,gc";
> +		reg = <0x0 0xff100000 0x0 0x20000>;
> +		interrupts = <0 147 4>;
> +		clocks = <&clkc CLKID_NNA_CORE_CLK>,
> +			 <&clkc CLKID_NNA_AXI_CLK>;
> +		clock-names = "core", "bus";
> +		resets = <&reset RESET_NNA>;
> +		power-domains = <&pwrc PWRC_G12A_NNA_ID>;

A status = "disable" is missing here.

> +	};
>   };
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-a311d-khadas-vim3.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-a311d-khadas-vim3.dts
> index 124a80901084..73f3d87dcefd 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12b-a311d-khadas-vim3.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-a311d-khadas-vim3.dts
> @@ -15,6 +15,10 @@ / {
>   	compatible = "khadas,vim3", "amlogic,a311d", "amlogic,g12b";
>   };
>   
> +&npu {
> +	status = "okay";

Tomeu, I think until the user-space stack is clean this should be removed
and left disabled.

I can fix this while applying if you want,

Neil

> +};
> +
>   /*
>    * The VIM3 on-board  MCU can mux the PCIe/USB3.0 shared differential
>    * lines using a FUSB340TMX USB 3.1 SuperSpeed Data Switch between