linux-kernel - Re: [PATCH v5 06/20] dt-bindings: memory: introduce DDR4

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Message-ID: <20250730211151.GA1749004-robh@kernel.org>
Date: Wed, 30 Jul 2025 16:11:51 -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>,
	Julius Werner <jwerner@...omium.org>,
	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 v5 06/20] dt-bindings: memory: introduce DDR4

On Mon, Jul 28, 2025 at 05:29:37PM +0200, Clément Le Goffic wrote:
> Introduce JEDEC compliant DDR bindings, that use new memory-props binding.
> 
> Signed-off-by: Clément Le Goffic <clement.legoffic@...s.st.com>
> ---
>  .../memory-controllers/ddr/jedec,ddr4.yaml         | 34 ++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,ddr4.yaml b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,ddr4.yaml
> new file mode 100644
> index 000000000000..f457066a2f8b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,ddr4.yaml
> @@ -0,0 +1,34 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,ddr4.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: DDR3 SDRAM compliant to JEDEC JESD79-4D
> +
> +maintainers:
> +  - Krzysztof Kozlowski <krzk@...nel.org>
> +
> +allOf:
> +  - $ref: jedec,sdram-props.yaml#
> +
> +properties:
> +  compatible:
> +    items:
> +      - pattern: "^ddr4-[0-9a-f]{2},[0-9a-f]{1}$"

Shouldn't this be 'jedec,ddr4-...'

> +      - const: jedec,ddr4
> +
> +required:
> +  - compatible
> +  - density
> +  - io-width
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    ddr {
> +        compatible = "ddr4-ff,f", "jedec,ddr4";
> +        density = <8192>;
> +        io-width = <8>;
> +    };
> 
> -- 
> 2.43.0
>