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Date: Mon, 23 Sep 2019 20:34:46 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Peter Rosin <peda@...ntia.se>
Cc: Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH] dt-bindings: at24: convert the binding document to yaml
pon., 23 wrz 2019 o 20:30 Peter Rosin <peda@...ntia.se> napisał(a):
>
> On 2019-09-23 19:52, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >
> > Convert the binding document for at24 EEPROMs from txt to yaml. The
> > compatible property uses a regex pattern to address all the possible
> > combinations of "vendor,model" strings.
> >
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> > ---
> > .../devicetree/bindings/eeprom/at24.txt | 90 +--------------
> > .../devicetree/bindings/eeprom/at24.yaml | 107 ++++++++++++++++++
> > MAINTAINERS | 2 +-
> > 3 files changed, 109 insertions(+), 90 deletions(-)
> > create mode 100644 Documentation/devicetree/bindings/eeprom/at24.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/eeprom/at24.txt b/Documentation/devicetree/bindings/eeprom/at24.txt
> > index 22aead844d0f..c94acbb8cb0c 100644
> > --- a/Documentation/devicetree/bindings/eeprom/at24.txt
> > +++ b/Documentation/devicetree/bindings/eeprom/at24.txt
> > @@ -1,89 +1 @@
> > -EEPROMs (I2C)
> > -
> > -Required properties:
> > -
> > - - compatible: Must be a "<manufacturer>,<model>" pair. The following <model>
> > - values are supported (assuming "atmel" as manufacturer):
> > -
> > - "atmel,24c00",
> > - "atmel,24c01",
> > - "atmel,24cs01",
> > - "atmel,24c02",
> > - "atmel,24cs02",
> > - "atmel,24mac402",
> > - "atmel,24mac602",
> > - "atmel,spd",
> > - "atmel,24c04",
> > - "atmel,24cs04",
> > - "atmel,24c08",
> > - "atmel,24cs08",
> > - "atmel,24c16",
> > - "atmel,24cs16",
> > - "atmel,24c32",
> > - "atmel,24cs32",
> > - "atmel,24c64",
> > - "atmel,24cs64",
> > - "atmel,24c128",
> > - "atmel,24c256",
> > - "atmel,24c512",
> > - "atmel,24c1024",
> > - "atmel,24c2048",
> > -
> > - If <manufacturer> is not "atmel", then a fallback must be used
> > - with the same <model> and "atmel" as manufacturer.
> > -
> > - Example:
> > - compatible = "microchip,24c128", "atmel,24c128";
> > -
> > - Supported manufacturers are:
> > -
> > - "catalyst",
> > - "microchip",
> > - "nxp",
> > - "ramtron",
> > - "renesas",
> > - "rohm",
> > - "st",
> > -
> > - Some vendors use different model names for chips which are just
> > - variants of the above. Known such exceptions are listed below:
> > -
> > - "nxp,se97b" - the fallback is "atmel,24c02",
> > - "renesas,r1ex24002" - the fallback is "atmel,24c02"
> > - "renesas,r1ex24016" - the fallback is "atmel,24c16"
> > - "renesas,r1ex24128" - the fallback is "atmel,24c128"
> > - "rohm,br24t01" - the fallback is "atmel,24c01"
> > -
> > - - reg: The I2C address of the EEPROM.
> > -
> > -Optional properties:
> > -
> > - - pagesize: The length of the pagesize for writing. Please consult the
> > - manual of your device, that value varies a lot. A wrong value
> > - may result in data loss! If not specified, a safety value of
> > - '1' is used which will be very slow.
> > -
> > - - read-only: This parameterless property disables writes to the eeprom.
> > -
> > - - size: Total eeprom size in bytes.
> > -
> > - - no-read-rollover: This parameterless property indicates that the
> > - multi-address eeprom does not automatically roll over
> > - reads to the next slave address. Please consult the
> > - manual of your device.
> > -
> > - - wp-gpios: GPIO to which the write-protect pin of the chip is connected.
> > -
> > - - address-width: number of address bits (one of 8, 16).
> > -
> > - - num-addresses: total number of i2c slave addresses this device takes
> > -
> > -Example:
> > -
> > -eeprom@52 {
> > - compatible = "atmel,24c32";
> > - reg = <0x52>;
> > - pagesize = <32>;
> > - wp-gpios = <&gpio1 3 0>;
> > - num-addresses = <8>;
> > -};
> > +This file has been moved to at24.yaml.
> > diff --git a/Documentation/devicetree/bindings/eeprom/at24.yaml b/Documentation/devicetree/bindings/eeprom/at24.yaml
> > new file mode 100644
> > index 000000000000..28c8b068c8a1
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/eeprom/at24.yaml
> > @@ -0,0 +1,107 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +# Copyright 2019 BayLibre SAS
> > +%YAML 1.2
> > +---
> > +$id: "http://devicetree.org/schemas/eeprom/at24.yaml#"
> > +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> > +
> > +title: I2C EEPROMs compatible with Atmel's AT24
> > +
> > +maintainers:
> > + - Bartosz Golaszewski <bgolaszewski@...libre.com>
> > +
> > +properties:
> > + compatible:
> > + additionalItems: true
> > + maxItems: 2
> > + pattern: "^(atmel|catalyst|microchip|nxp|ramtron|renesas|rohm|st),24(c|cs|mac)[0-9]+$"
> > + oneOf:
> > + - const: nxp,se97b
> > + - const: renesas,r1ex24002
> > + - const: renesas,r1ex24016
> > + - const: renesas,r1ex24128
> > + - const: rohm,br24t01
> > + contains:
> > + enum:
> > + - atmel,24c00
> > + - atmel,24c01
> > + - atmel,24cs01
> > + - atmel,24c02
> > + - atmel,24cs02
> > + - atmel,24mac402
> > + - atmel,24mac602
> > + - atmel,spd
> > + - atmel,24c04
> > + - atmel,24cs04
> > + - atmel,24c08
> > + - atmel,24cs08
> > + - atmel,24c16
> > + - atmel,24cs16
> > + - atmel,24c32
> > + - atmel,24cs32
> > + - atmel,24c64
> > + - atmel,24cs64
> > + - atmel,24c128
> > + - atmel,24c256
> > + - atmel,24c512
> > + - atmel,24c1024
> > + - atmel,24c2048
>
> The previous binding allows more e.g.
>
> compatible = "nxp,spd", "atmel,spd";
>
Ugh, I was thinking about spd and then forgot it anyway. :(
> which is no longer allowed. That might be a problem? The previous binding
> also allows less e.g.
>
> compatible = "atmel,24c00", "renesas,24mac402";
>
Right, but I'm not really sure how to express fallbacks in yaml. Any hint?
Bart
> which of course is nonsense but AFAIU now allowed.
>
> The new formal rules are therefore not "right", and it might be impossible
> to express the subtleties of this weird binding with the current spec so
> there might be little to do about it? But either way, these issues are not
> mentioned neither in the binding nor the commit message. Should they be
> mentioned?
>
> Cheers,
> Peter
>
> > +
> > + reg:
> > + description:
> > + The I2C slave address of the EEPROM.
> > + maxItems: 1
> > +
> > + pagesize:
> > + description:
> > + The length of the pagesize for writing. Please consult the
> > + manual of your device, that value varies a lot. A wrong value
> > + may result in data loss! If not specified, a safety value of
> > + '1' is used which will be very slow.
> > + type: integer
> > +
> > + read-only:
> > + description:
> > + This parameterless property disables writes to the eeprom.
> > + type: boolean
> > +
> > + size:
> > + description:
> > + Total eeprom size in bytes.
> > + type: integer
> > +
> > + no-read-rollover:
> > + description:
> > + This parameterless property indicates that the multi-address
> > + eeprom does not automatically roll over reads to the next slave
> > + address. Please consult the manual of your device.
> > + type: boolean
> > +
> > + wp-gpios:
> > + description:
> > + GPIO to which the write-protect pin of the chip is connected.
> > + maxItems: 1
> > +
> > + address-width:
> > + description:
> > + Number of address bits (one of 8, 16).
> > + type: integer
> > +
> > + num-addresses:
> > + description:
> > + Total number of i2c slave addresses this device takes.
> > + type: integer
> > +
> > +required:
> > + - compatible
> > + - reg
> > +
> > +examples:
> > + - |
> > + eeprom@52 {
> > + compatible = "microchip,24c32", "atmel,24c32";
> > + reg = <0x52>;
> > + pagesize = <32>;
> > + wp-gpios = <&gpio1 3 0>;
> > + num-addresses = <8>;
> > + };
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index a400af0501c9..3c7ced686966 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -2698,7 +2698,7 @@ M: Bartosz Golaszewski <bgolaszewski@...libre.com>
> > L: linux-i2c@...r.kernel.org
> > T: git git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git
> > S: Maintained
> > -F: Documentation/devicetree/bindings/eeprom/at24.txt
> > +F: Documentation/devicetree/bindings/eeprom/at24.yaml
> > F: drivers/misc/eeprom/at24.c
> >
> > ATA OVER ETHERNET (AOE) DRIVER
> >
>
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