linux-kernel - Re: [PATCH v2 06/16] arm64: dts: st: add LPDDR channel to stm32mp257f-dk board

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Message-ID: <20250715032020.GB4144523-robh@kernel.org>
Date: Mon, 14 Jul 2025 22:20:20 -0500
From: Rob Herring <robh@...nel.org>
To: Clément Le Goffic <clement.legoffic@...s.st.com>
Cc: Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Jonathan Corbet <corbet@....net>,
	Gatien Chevallier <gatien.chevallier@...s.st.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Gabriel Fernandez <gabriel.fernandez@...s.st.com>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Le Goffic <legoffic.clement@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-perf-users@...r.kernel.org, devicetree@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 06/16] arm64: dts: st: add LPDDR channel to
 stm32mp257f-dk board

On Fri, Jul 11, 2025 at 04:48:58PM +0200, Clément Le Goffic wrote:
> Add 32bits LPDDR4 channel to the stm32mp257f-dk board.
> 
> Signed-off-by: Clément Le Goffic <clement.legoffic@...s.st.com>
> ---
>  arch/arm64/boot/dts/st/stm32mp257f-dk.dts | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/st/stm32mp257f-dk.dts b/arch/arm64/boot/dts/st/stm32mp257f-dk.dts
> index a278a1e3ce03..a97b41f14ecc 100644
> --- a/arch/arm64/boot/dts/st/stm32mp257f-dk.dts
> +++ b/arch/arm64/boot/dts/st/stm32mp257f-dk.dts
> @@ -54,6 +54,13 @@ led-blue {
>  		};
>  	};
>  
> +	lpddr_channel: lpddr4-channel {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		compatible = "jedec,lpddr4-channel";

Not tested because this doesn't match the binding.

> +		io-width = <32>;
> +	};

What would multiple channels look like? I think this needs some work. 
Like it should perhaps be within the memory node. It's a lot to just say 
32-bit LPDDR4 x1.

> +
>  	memory@...00000 {
>  		device_type = "memory";
>  		reg = <0x0 0x80000000 0x1 0x0>;
> 
> -- 
> 2.43.0
>