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[194.187.74.233]) by smtp.googlemail.com with ESMTPSA id a5-20020ac25e65000000b00443c375b7a7sm149342lfr.20.2022.02.25.01.07.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 25 Feb 2022 01:07:21 -0800 (PST) Message-ID: Date: Fri, 25 Feb 2022 10:07:20 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:96.0) Gecko/20100101 Thunderbird/96.0 Subject: Re: [PATCH REBASED 2/2] dt-bindings: nvmem: cells: add MAC address cell To: Michael Walle , Rob Herring Cc: Srinivas Kandagatla , linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org, Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Shawn Guo , Li Yang , Frank Rowand , "David S . Miller" , Jakub Kicinski , Ansuel Smith , Andrew Lunn , Florian Fainelli , Hauke Mehrtens , =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= References: <20220125180114.12286-1-zajec5@gmail.com> <20220126070745.32305-1-zajec5@gmail.com> <20220126070745.32305-2-zajec5@gmail.com> <0b7b8f7ea6569f79524aea1a3d783665@walle.cc> From: =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= In-Reply-To: <0b7b8f7ea6569f79524aea1a3d783665@walle.cc> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On 1.02.2022 18:01, Michael Walle wrote: > Am 2022-02-01 16:55, schrieb Rob Herring: >> On Wed, Jan 26, 2022 at 08:07:45AM +0100, Rafał Miłecki wrote: >>> From: Rafał Miłecki >>> >>> This adds support for describing details of NVMEM cell containing MAC >>> address. Those are often device specific and could be nicely stored in >>> DT. >>> >>> Initial documentation includes support for describing: >>> 1. Cell data format (e.g. Broadcom's NVRAM uses ASCII to store MAC) >>> 2. Reversed bytes flash (required for i.MX6/i.MX7 OCOTP support) >>> 3. Source for multiple addresses (very common in home routers) >>> >>> Signed-off-by: Rafał Miłecki >>> --- >>>  .../bindings/nvmem/cells/mac-address.yaml     | 94 +++++++++++++++++++ >>>  1 file changed, 94 insertions(+) >>>  create mode 100644 Documentation/devicetree/bindings/nvmem/cells/mac-address.yaml >>> >>> diff --git a/Documentation/devicetree/bindings/nvmem/cells/mac-address.yaml b/Documentation/devicetree/bindings/nvmem/cells/mac-address.yaml >>> new file mode 100644 >>> index 000000000000..f8d19e87cdf0 >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/nvmem/cells/mac-address.yaml >>> @@ -0,0 +1,94 @@ >>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause >>> +%YAML 1.2 >>> +--- >>> +$id: http://devicetree.org/schemas/nvmem/cells/mac-address.yaml# >>> +$schema: http://devicetree.org/meta-schemas/core.yaml# >>> + >>> +title: NVMEM cell containing a MAC address >>> + >>> +maintainers: >>> +  - Rafał Miłecki >>> + >>> +properties: >>> +  compatible: >>> +    const: mac-address >>> + >>> +  format: >>> +    description: | >>> +      Some NVMEM cells contain MAC in a non-binary format. >>> + >>> +      ASCII should be specified if MAC is string formatted like: >>> +      - "01:23:45:67:89:AB" (30 31 3a 32 33 3a 34 35 3a 36 37 3a 38 39 3a 41 42) >>> +      - "01-23-45-67-89-AB" >>> +      - "0123456789AB" >>> +    enum: >>> +      - ascii >>> + >>> +  reversed-bytes: >>> +    type: boolean >>> +    description: | >>> +      MAC is stored in reversed bytes order. Example: >>> +      Stored value: AB 89 67 45 23 01 >>> +      Actual MAC: 01 23 45 67 89 AB >>> + >>> +  base-address: >>> +    type: boolean >>> +    description: | >>> +      Marks NVMEM cell as provider of multiple addresses that are relative to >>> +      the one actually stored physically. Respective addresses can be requested >>> +      by specifying cell index of NVMEM cell. >> >> While a base address is common, aren't there different ways the base is >> modified. >> >> The problem with these properties is every new variation results in a >> new property and the end result is something not well designed. A unique >> compatible string, "#nvmem-cell-cells" and code to interpret the data is >> more flexible. > > I actually like having a unique compatible for anything but the basic > operations. For example, the sl28 vpd area also has a checksum, which > could be handled if there is an own compatible. I don't think this is > possible with this proposal. Also there is a version field, what if > we change the layout of that thing? Am I supposed to change the > device tree? The more I think about Rob's proposal to have a compatible > the more I like it. Having more detailed binding for cells doesn't stop you from using NVMEM device specific binding. You could have e.g. partition@f00000 { compatible = "foo,foo-cells", "nvmem-cells"; (...) mac@100 { compatible = "mac-address"; reg = <0x100 0x6>; }; OR mac@100 { compatible = "mac-address"; reg = <0x100 0x11>; format = "ascii"; }; }; Then you can have "foo,foo-cells" driver handling checksum. I'm not saying we have to use this solution, just saying it's possible.