linux-kernel - [PATCH 2/8] dt-bindings: nvmem: fixed-layout: Allow optional bit positions

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Message-ID: <20250712181905.6738-3-srini@kernel.org>
Date: Sat, 12 Jul 2025 19:18:58 +0100
From: srini@...nel.org
To: gregkh@...uxfoundation.org
Cc: linux-kernel@...r.kernel.org,
	Sven Peter <sven@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Srinivas Kandagatla <srini@...nel.org>
Subject: [PATCH 2/8] dt-bindings: nvmem: fixed-layout: Allow optional bit positions

From: Sven Peter <sven@...nel.org>

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>
Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
Signed-off-by: Srinivas Kandagatla <srini@...nel.org>
---
 .../devicetree/bindings/nvmem/layouts/fixed-layout.yaml         | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/nvmem/layouts/fixed-layout.yaml b/Documentation/devicetree/bindings/nvmem/layouts/fixed-layout.yaml
index 9bd34bd5af30..b01567f99284 100644
--- a/Documentation/devicetree/bindings/nvmem/layouts/fixed-layout.yaml
+++ b/Documentation/devicetree/bindings/nvmem/layouts/fixed-layout.yaml
@@ -27,7 +27,7 @@ properties:
     const: 1
 
 patternProperties:
-  "@[a-f0-9]+$":
+  "@[a-f0-9]+(,[0-7])?$":
     type: object
     $ref: fixed-cell.yaml
     unevaluatedProperties: false
-- 
2.43.0