linux-kernel - Re: [PATCH 3/3] arm64: dts: ti: k3-j784s4-j742s2: enable the bxs-4-64

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Message-ID: <20250813151819.5rthljjrpryfwezz@skinning>
Date: Wed, 13 Aug 2025 10:18:19 -0500
From: Nishanth Menon <nm@...com>
To: <rs@...com>
CC: <vigneshr@...com>, <kristo@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <d-gole@...com>,
        <afd@...com>, <bb@...com>, <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <detheridge@...com>, <matt.coster@...tec.com>
Subject: Re: [PATCH 3/3] arm64: dts: ti: k3-j784s4-j742s2: enable the bxs-4-64

On 18:25-20250808, rs@...com wrote:
> From: Randolph Sapp <rs@...com>
> 
> Add the relevant device tree node for Imagination's BXS-4-64 GPU.
> 
> These devices uses a similar MSMC configuration to the J721S2. As such,
> they also require the use of the dma-coherent attribute.
> 
> Signed-off-by: Randolph Sapp <rs@...com>
> ---
>  .../boot/dts/ti/k3-j784s4-j742s2-main-common.dtsi  | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-main-common.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-main-common.dtsi
> index 7c5b0c69897d..a44ca34dda62 100644
> --- a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-main-common.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-main-common.dtsi
> @@ -2691,4 +2691,18 @@ bist_main14: bist@...0000 {
>  		bootph-pre-ram;
>  		ti,sci-dev-id = <234>;
>  	};
> +
> +	gpu: gpu@...0000000 {
> +		compatible = "ti,j721s2-gpu", "img,img-bxs-4-64", "img,img-rogue";

Following  https://lore.kernel.org/linux-arm-kernel/DBE4UO2RGAYX.17V1DAF8MQYJM@kernel.org/
Is it worth having ti,j784s4-gpu here? Are there any SoC specific quirks
that driver will need to handle?

> +		reg = <0x4e 0x20000000 0x00 0x80000>;
> +		clocks = <&k3_clks 181 1>;
> +		clock-names = "core";
> +		assigned-clocks = <&k3_clks 181 1>;
> +		assigned-clock-rates = <800000000>;
> +		interrupts = <GIC_SPI 24 IRQ_TYPE_LEVEL_HIGH>;
> +		power-domains = <&k3_pds 181 TI_SCI_PD_EXCLUSIVE>,
> +				<&k3_pds 182 TI_SCI_PD_EXCLUSIVE>;
> +		power-domain-names = "a", "b";
> +		dma-coherent;
> +	};
>  };
> -- 
> 2.50.1
> 

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D
https://ti.com/opensource