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To:     Geert Uytterhoeven <geert@linux-m68k.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
        Oleksij Rempel <o.rempel@pengutronix.de>
Cc:     Wolfgang Grandegger <wg@grandegger.com>,
        Rob Herring <robh+dt@kernel.org>, linux-can@vger.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        dev.kurt@vandijck-laurijssen.be,
        Thomas Kopp <Thomas.Kopp@microchip.com>
References: <20200910133806.25077-1-manivannan.sadhasivam@linaro.org>
 <20200910133806.25077-3-manivannan.sadhasivam@linaro.org>
 <CAMuHMdVkwGjr6dJuMyhQNqFoJqbh6Ec5V2b5LenCshwpM2SDsQ@mail.gmail.com>
From:   Marc Kleine-Budde <mkl@pengutronix.de>
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Subject: Re: [PATCH 2/6] dt-bindings: can: mcp25xxfd: document device tree
 bindings
Message-ID: <cbfa3fdb-bcfd-cca5-fcf5-95a78da0447d@pengutronix.de>
Date:   Tue, 29 Sep 2020 12:06:24 +0200
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From: Marc Kleine-Budde <mkl@pengutronix.de>
To: Geert Uytterhoeven <geert@linux-m68k.org>,
 Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
 Oleksij Rempel <o.rempel@pengutronix.de>
Cc: Wolfgang Grandegger <wg@grandegger.com>, Rob Herring
 <robh+dt@kernel.org>, linux-can@vger.kernel.org,
 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
 <devicetree@vger.kernel.org>,
 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
 dev.kurt@vandijck-laurijssen.be, Thomas Kopp <Thomas.Kopp@microchip.com>
Message-ID: <cbfa3fdb-bcfd-cca5-fcf5-95a78da0447d@pengutronix.de>
Subject: Re: [PATCH 2/6] dt-bindings: can: mcp25xxfd: document device tree
 bindings
References: <20200910133806.25077-1-manivannan.sadhasivam@linaro.org>
 <20200910133806.25077-3-manivannan.sadhasivam@linaro.org>
 <CAMuHMdVkwGjr6dJuMyhQNqFoJqbh6Ec5V2b5LenCshwpM2SDsQ@mail.gmail.com>
In-Reply-To: <CAMuHMdVkwGjr6dJuMyhQNqFoJqbh6Ec5V2b5LenCshwpM2SDsQ@mail.gmail.com>

--GS8VHcTEJMRGQpoEd2ZySgOden3czQM04
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: quoted-printable

On 9/29/20 11:46 AM, Geert Uytterhoeven wrote:
> Hi Manivannan, Oleksij,
>=20
> On Thu, Sep 10, 2020 at 11:37 PM Manivannan Sadhasivam
> <manivannan.sadhasivam@linaro.org> wrote:
>> From: Oleksij Rempel <o.rempel@pengutronix.de>
>>
>> This patch adds the device-tree binding documentation for the Microchi=
p
>> MCP25xxFD SPI CAN controller family.
>>
>> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
>> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
>> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org=
>
>=20
> Thanks for your patch, which is now commit 1b5a78e69c1fdae9
> ("dt-binding: can: mcp25xxfd: document device tree bindings") in net-ne=
xt.
>=20
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/net/can/microchip,mcp25xxfd.ya=
ml
>> @@ -0,0 +1,79 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/net/can/microchip,mcp25xxfd.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title:
>> +  Microchip MCP2517FD and MCP2518FD stand-alone CAN controller device=
 tree
>> +  bindings
>> +
>> +maintainers:
>> +  - Marc Kleine-Budde <mkl@pengutronix.de>
>> +
>> +properties:
>> +  compatible:
>> +    oneOf:
>> +      - const: microchip,mcp2517fd
>> +        description: for MCP2517FD
>> +      - const: microchip,mcp2518fd
>> +        description: for MCP2518FD
>> +      - const: microchip,mcp25xxfd
>> +        description: to autodetect chip variant
>=20
> The last one is a wildcard?
> When would you want to use it (oh, in the example below)?

Im using it in overlays for several raspi hats, e.g. a raspi to click boa=
rd
converter where I add mcp2517fd or mcp2518fd modules without the need to =
change
the overlay.

> Can you guarantee Microchip will not introduce other components that
> match this wildcard, but are not compatible?

Guarantee is quite a strong word :)

So far in that name space there are the mcp2510, mcp2515 and mcp25625. Fr=
om the
SW point of view the 2515 and 25625 are identical while being compatible =
to the
mcp2510 but offer more features. There's a single drver (mcp251x) for the=
se.
These chips implement the CAN-2.0 standard.

Regarding the mcp2517fd and mcp2518fd, the "fd" in the name references th=
e
CAN-FD standard (successor to CAN-2.0).

Maybe Thomas Kopp (Cc'ed) from Microchip can say something to this.

We can rename the compatible to mcp251xfd to make it more specific.

regards,
Marc

--=20
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |


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