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=?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= Cc: Srinivas Kandagatla , Krzysztof Kozlowski , Conor Dooley , Miquel Raynal , Christian Marangi , devicetree@vger.kernel.org, linux-mtd@lists.infradead.org, linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= Subject: Re: [PATCH V2] dt-bindings: nvmem: fixed-cell: add compatible for MAC cells Message-ID: <20230626165851.GA3387880-robh@kernel.org> References: <20230626113716.17674-1-zajec5@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20230626113716.17674-1-zajec5@gmail.com> Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Mon, Jun 26, 2023 at 01:37:16PM +0200, Rafał Miłecki wrote: > From: Rafał Miłecki > > A lot of home routers have NVMEM fixed cells containing MAC address that > need some further processing. In ~99% cases MAC needs to be: > 1. Optionally parsed from ASCII format > 2. Increased by a vendor-picked value > > There was already an attempt to design a binding for that at NVMEM > device level in the past. It wasn't accepted though as it didn't really > fit NVMEM device layer. > > The introduction of NVMEM fixed-cells layout seems to be an opportunity > to provide a relevant binding in a clean way. > > This commit adds a *generic* compatible string: "mac-base". As always it > needs to be carefully reviewed. > > OpenWrt project currently supports ~300 home routers that have NVMEM > cell with binary-stored base MAC.T hose devices are manufactured by > multiple vendors. There are TP-Link devices (76 of them), Netgear (19), > D-Link (11), OpenMesh (9), EnGenius (8), GL.iNet (8), ZTE (7), > Xiaomi (5), Ubiquiti (6) and more. Those devices don't share an > architecture or SoC. > > Another 200 devices have base MAC stored in an ASCII format (not all > those devices have been converted to DT though). > > It would be impractical to provide unique "compatible" strings for NVMEM > layouts of all those devices. It seems like a valid case for allowing a > generic binding instead. Even if this binding will not be sufficient for > some further devices it seems to be useful enough as it is. > > Signed-off-by: Rafał Miłecki > --- > V2: Drop "mac-ascii" as length can be checked instead > Fix "allOf" by adding required: [ compatible ] > --- > .../bindings/nvmem/layouts/fixed-cell.yaml | 26 +++++++++++++++++++ > .../bindings/nvmem/layouts/fixed-layout.yaml | 12 +++++++++ > .../devicetree/bindings/nvmem/nvmem.yaml | 5 +++- > 3 files changed, 42 insertions(+), 1 deletion(-) > > diff --git a/Documentation/devicetree/bindings/nvmem/layouts/fixed-cell.yaml b/Documentation/devicetree/bindings/nvmem/layouts/fixed-cell.yaml > index e698098450e1..036a9ed88893 100644 > --- a/Documentation/devicetree/bindings/nvmem/layouts/fixed-cell.yaml > +++ b/Documentation/devicetree/bindings/nvmem/layouts/fixed-cell.yaml > @@ -11,6 +11,15 @@ maintainers: > - Srinivas Kandagatla > > properties: > + compatible: > + oneOf: > + - const: mac-base > + description: > > + Cell with base MAC address to be used for calculating extra relative > + addresses. > + It can be stored in a plain binary format (cell length 12) or as an Don't you mean a length of 6? > + ASCII text like "00:11:22:33:44:55" (cell length 17). > + > reg: > maxItems: 1 > > @@ -25,6 +34,23 @@ properties: > description: > Size in bit within the address range specified by reg. > > +allOf: > + - if: > + required: [ compatible ] > + then: > + if: > + properties: > + compatible: > + contains: > + const: mac-base > + then: > + properties: > + "#nvmem-cell-cells": > + description: The first argument is a MAC address offset. > + const: 1 > + required: > + - "#nvmem-cell-cells" > + > required: > - reg > > diff --git a/Documentation/devicetree/bindings/nvmem/layouts/fixed-layout.yaml b/Documentation/devicetree/bindings/nvmem/layouts/fixed-layout.yaml > index c271537d0714..b3a09e8864f1 100644 > --- a/Documentation/devicetree/bindings/nvmem/layouts/fixed-layout.yaml > +++ b/Documentation/devicetree/bindings/nvmem/layouts/fixed-layout.yaml > @@ -44,6 +44,18 @@ examples: > #address-cells = <1>; > #size-cells = <1>; > > + mac@100 { > + compatible = "mac-base"; > + reg = <0x100 0xc>; > + #nvmem-cell-cells = <1>; > + }; > + > + mac@110 { > + compatible = "mac-base"; > + reg = <0x110 0x11>; > + #nvmem-cell-cells = <1>; > + }; > + > calibration@4000 { > reg = <0x4000 0x100>; > }; > diff --git a/Documentation/devicetree/bindings/nvmem/nvmem.yaml b/Documentation/devicetree/bindings/nvmem/nvmem.yaml > index 980244100690..9f921d940142 100644 > --- a/Documentation/devicetree/bindings/nvmem/nvmem.yaml > +++ b/Documentation/devicetree/bindings/nvmem/nvmem.yaml > @@ -49,7 +49,10 @@ properties: > patternProperties: > "@[0-9a-f]+(,[0-7])?$": > type: object > - $ref: layouts/fixed-cell.yaml > + allOf: > + - $ref: layouts/fixed-cell.yaml > + - properties: > + compatible: false > deprecated: true > > additionalProperties: true > -- > 2.35.3 >