linux-kernel - Re: [RFC v3 16/18] riscv: dts: thead: Introduce power domain nodes with aon firmware

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Message-ID: <9dee2610-019b-4b8c-af8f-0a401e46a307@kernel.org>
Date: Tue, 21 Jan 2025 11:11:21 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Michal Wilczynski <m.wilczynski@...sung.com>, mturquette@...libre.com,
 sboyd@...nel.org, robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 drew@...7.com, guoren@...nel.org, wefu@...hat.com, jassisinghbrar@...il.com,
 paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu,
 frank.binns@...tec.com, matt.coster@...tec.com,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de,
 airlied@...il.com, simona@...ll.ch, ulf.hansson@...aro.org,
 jszhang@...nel.org, p.zabel@...gutronix.de, m.szyprowski@...sung.com
Cc: linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
 dri-devel@...ts.freedesktop.org, linux-pm@...r.kernel.org
Subject: Re: [RFC v3 16/18] riscv: dts: thead: Introduce power domain nodes
 with aon firmware

On 20/01/2025 18:21, Michal Wilczynski wrote:
> The DRM Imagination GPU requires a power-domain driver. In the T-HEAD
> TH1520 SoC implements power management capabilities through the E902
> core, which can be communicated with through the mailbox, using firmware
> protocol.
> 
> Add AON node, which servers as a power-domain controller.
> 
> Signed-off-by: Michal Wilczynski <m.wilczynski@...sung.com>
> ---
>  arch/riscv/boot/dts/thead/th1520.dtsi | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi b/arch/riscv/boot/dts/thead/th1520.dtsi
> index d4cba0713cab..d6af27cbb786 100644
> --- a/arch/riscv/boot/dts/thead/th1520.dtsi
> +++ b/arch/riscv/boot/dts/thead/th1520.dtsi
> @@ -6,6 +6,7 @@
>  
>  #include <dt-bindings/interrupt-controller/irq.h>
>  #include <dt-bindings/clock/thead,th1520-clk-ap.h>
> +#include <dt-bindings/firmware/thead,th1520-aon.h>


What do you need this header for?

>  
>  / {
>  	compatible = "thead,th1520";
> @@ -229,6 +230,13 @@ stmmac_axi_config: stmmac-axi-config {
>  		snps,blen = <0 0 64 32 0 0 0>;
>  	};
>  
> +	aon: aon {
> +		compatible = "thead,th1520-aon";
> +		mboxes = <&mbox_910t 1>;


If it is not used at all?



Best regards,
Krzysztof