linux-kernel - Re: [PATCH 1/2] dt-bindings: nvmem: fixed-layout: Allow optional bit positions

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Message-ID: <175088123275.2111151.12116802075746070552.robh@kernel.org>
Date: Wed, 25 Jun 2025 14:53:53 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Sven Peter <sven@...nel.org>
Cc: devicetree@...r.kernel.org, Srinivas Kandagatla <srini@...nel.org>,
	linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Neal Gompa <neal@...pa.dev>, Hector Martin <marcan@...can.st>,
	asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	Sasha Finkelstein <fnkl.kernel@...il.com>,
	Janne Grunau <j@...nau.net>
Subject: Re: [PATCH 1/2] dt-bindings: nvmem: fixed-layout: Allow optional bit
 positions


On Tue, 10 Jun 2025 17:17:34 +0000, Sven Peter wrote:
> NVMEM nodes can optionally include the bits property to specify the bit
> position of the cell within a byte.
> Extend patternProperties to allow adding the bit offset to the node
> address to be able to distinguish nodes with the same address but
> different bit positions, e.g.
> 
>    trim@54,4 {
>         reg = <0x54 1>;
>         bits = <4 2>;
>     };
>     trim@54,0 {
>         reg = <0x54 1>;
>         bits = <0 4>;
>     };
> 
> Before the conversion to NVMEM layouts in commit bd912c991d2e
> ("dt-bindings: nvmem: layouts: add fixed-layout") this extension was
> originally added with commit 4b2545dd19ed ("dt-bindings: nvmem: Extend
> patternProperties to optionally indicate bit position") to the now
> deprecated layout.
> 
> Signed-off-by: Sven Peter <sven@...nel.org>
> ---
>  Documentation/devicetree/bindings/nvmem/layouts/fixed-layout.yaml | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>