linux-kernel - Re: [PATCH v3 1/5] dt-bindings: at24: consistently document the compatible property

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Date:   Wed, 27 Dec 2017 11:21:21 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Javier Martinez Canillas <javier@...hile0.org>,
        David Lechner <david@...hnology.com>,
        Divagar Mohandass <divagar.mohandass@...el.com>,
        Peter Rosin <peda@...ntia.se>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/5] dt-bindings: at24: consistently document the
 compatible property

On Wed, Dec 27, 2017 at 7:50 AM, Bartosz Golaszewski <brgl@...ev.pl> wrote:
> Current description of the compatible property for at24 is quite vague.
>
> State explicitly that any "<manufacturer>,<model>" pair is accepted as
> long as one of the listed strings is used as fallback.
>
> Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
> ---
>  Documentation/devicetree/bindings/eeprom/at24.txt | 37 +++++++++--------------
>  1 file changed, 15 insertions(+), 22 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/eeprom/at24.txt b/Documentation/devicetree/bindings/eeprom/at24.txt
> index cbc80e194ac6..b5ce5a247554 100644
> --- a/Documentation/devicetree/bindings/eeprom/at24.txt
> +++ b/Documentation/devicetree/bindings/eeprom/at24.txt
> @@ -2,28 +2,21 @@ EEPROMs (I2C)
>
>  Required properties:
>
> -  - compatible : should be "<manufacturer>,<type>", like these:
> -
> -       "atmel,24c00", "atmel,24c01", "atmel,24c02", "atmel,24c04",
> -       "atmel,24c08", "atmel,24c16", "atmel,24c32", "atmel,24c64",
> -       "atmel,24c128", "atmel,24c256", "atmel,24c512", "atmel,24c1024"
> -
> -       "catalyst,24c32"
> -
> -       "microchip,24c128"
> -
> -       "ramtron,24c64"
> -
> -       "renesas,r1ex24002"

Keep this and any others that don't have an atmel model. This should
probably also state what the fallback should be (atmel,24c02 ?).

> -
> -       The following manufacturers values have been deprecated:
> -       "at", "at24"
> -
> -        If there is no specific driver for <manufacturer>, a generic
> -        device with <type> and manufacturer "atmel" should be used.
> -        Possible types are:
> -        "24c00", "24c01", "24c02", "24c04", "24c08", "24c16", "24c32", "24c64",
> -        "24c128", "24c256", "24c512", "24c1024", "spd"

You remove "spd" here and add it back later. Just fold that in below.
I'll leave it to others to bikeshed where in the list.

> +  - compatible: must be a "<manufacturer>,<model>" pair with one of the

We should enumerate known vendors/manufacturers because something like
"linaro,24c00" is not valid.

> +                following values as fallback:
> +
> +                "atmel,24c00",
> +                "atmel,24c01",
> +                "atmel,24c02",
> +                "atmel,24c04",
> +                "atmel,24c08",
> +                "atmel,24c16",
> +                "atmel,24c32",
> +                "atmel,24c64",
> +                "atmel,24c128",
> +                "atmel,24c256",
> +                "atmel,24c512",
> +                "atmel,24c1024"
>
>    - reg : the I2C address of the EEPROM
>
> --
> 2.15.1
>