linux-kernel - Re: [PATCH v2 2/4] doc: Add Atmel AT30TSE serial eeprom

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Date:   Mon, 27 Mar 2023 10:18:02 -0500
From:   Rob Herring <robh@...nel.org>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        arnd@...db.de, linux-aspeed@...ts.ozlabs.org,
        gregkh@...uxfoundation.org, krzysztof.kozlowski+dt@...aro.org
Subject: Re: [PATCH v2 2/4] doc: Add Atmel AT30TSE serial eeprom

On Tue, Mar 21, 2023 at 10:55:43AM -0500, Eddie James wrote:
> 
> On 3/21/23 10:46, Eddie James wrote:
> > 
> > On 3/21/23 10:19, Krzysztof Kozlowski wrote:
> > > On 21/03/2023 16:16, Eddie James wrote:
> > > > The AT30TSE is compatible with the JEDEC EE1004 standard. Document it
> > > > as a trivial I2C device.
> > > > 
> > > > Signed-off-by: Eddie James <eajames@...ux.ibm.com>
> > > Use subject prefixes matching the subsystem (which you can get for
> > > example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
> > > your patch is touching).
> > 
> > 
> > Oops, sorry, will fix.
> > 
> > 
> > > 
> > > > ---
> > > >   Documentation/devicetree/bindings/trivial-devices.yaml | 2 ++
> > > >   1 file changed, 2 insertions(+)
> > > > 
> > > > diff --git
> > > > a/Documentation/devicetree/bindings/trivial-devices.yaml
> > > > b/Documentation/devicetree/bindings/trivial-devices.yaml
> > > > index 6f482a254a1d..43e26c73a95f 100644
> > > > --- a/Documentation/devicetree/bindings/trivial-devices.yaml
> > > > +++ b/Documentation/devicetree/bindings/trivial-devices.yaml
> > > > @@ -47,6 +47,8 @@ properties:
> > > >             - ams,iaq-core
> > > >               # i2c serial eeprom (24cxx)
> > > >             - at,24c08
> > > > +            # i2c serial eeprom (EE1004 standard)
> > > AT30TSE?
> > > 
> > > > +          - atmel,at30tse
> > > Microchip does not find anything on AT30TSE. Are you sure this is the
> > > model name?
> > 
> > 
> > Yes: https://www.microchip.com/content/dam/mchp/documents/OTH/ProductDocuments/DataSheets/Atmel-8868-DTS-AT30TSE004A-Datasheet.pdf
> > 
> > 
> > Maybe it's actually an 8868? Or should I include the 004A as well?
> 
> 
> I found some other AT30TSE (AT30TSE752A for example) devices that do not
> appear compatible with the EE1004 standard, so I will include the full model
> number.

If this standard is sufficiently complete, then you might want a EE1004 
fallback compatible. Complete would mean power supply(ies) and any extra 
i/o are defined and the exact device model is discoverable.

Rob