linux-kernel - Re: [PATCH 1/2] dt-bindings: reset: sun55i-a523-r-ccu: Add missing PPU0 reset

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Message-ID: <20250620022803.13e7c34c@minigeek.lan>
Date: Fri, 20 Jun 2025 02:28:03 +0100
From: Andre Przywara <andre.przywara@....com>
To: Chen-Yu Tsai <wens@...nel.org>
Cc: Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec
 <jernej@...nel.org>, Samuel Holland <samuel@...lland.org>, Philipp Zabel
 <p.zabel@...gutronix.de>, devicetree@...r.kernel.org,
 linux-sunxi@...ts.linux.dev, linux-clk@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: reset: sun55i-a523-r-ccu: Add missing
 PPU0 reset

On Fri, 20 Jun 2025 01:10:24 +0800
Chen-Yu Tsai <wens@...nel.org> wrote:

> From: Chen-Yu Tsai <wens@...e.org>
> 
> There is a PPU0 reset control bit in the same register as the PPU1
> reset control. This missing reset control is for the PCK-600 unit
> in the SoC. Manual tests show that the reset control indeed exists,
> and if not configured, the system will hang when the PCK-600 registers
> are accessed.

Confirmed by experiment.

> Add a reset entry for it at the end of the existing ones.
> 
> Fixes: 52dbf84857f0 ("dt-bindings: clk: sunxi-ng: document two Allwinner A523 CCUs")
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>

Reviewed-by: Andre Przywara <andre.przywara@....com>

Cheers,
Andre

> ---
>  include/dt-bindings/reset/sun55i-a523-r-ccu.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/dt-bindings/reset/sun55i-a523-r-ccu.h b/include/dt-bindings/reset/sun55i-a523-r-ccu.h
> index dd6fbb372e19..eb31ae9958d6 100644
> --- a/include/dt-bindings/reset/sun55i-a523-r-ccu.h
> +++ b/include/dt-bindings/reset/sun55i-a523-r-ccu.h
> @@ -21,5 +21,6 @@
>  #define RST_BUS_R_IR_RX		12
>  #define RST_BUS_R_RTC		13
>  #define RST_BUS_R_CPUCFG	14
> +#define RST_BUS_R_PPU0		15
>  
>  #endif /* _DT_BINDINGS_RST_SUN55I_A523_R_CCU_H_ */