netdev - Re: [PATCH v2 1/4] dt-bindings: net: Add bindings for AX88796C SPI Ethernet Adapter

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Date:   Mon, 5 Oct 2020 09:03:59 -0500
From:   Rob Herring <robh@...nel.org>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Łukasz Stelmach <l.stelmach@...sung.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>, jim.cromie@...il.com,
        linux-arm-kernel@...ts.infradead.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org,
        Bartłomiej Żolnierkiewicz 
        <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH v2 1/4] dt-bindings: net: Add bindings for AX88796C SPI
 Ethernet Adapter

On Sat, Oct 03, 2020 at 12:09:55PM +0200, Krzysztof Kozlowski wrote:
> On Fri, 2 Oct 2020 at 21:22, Łukasz Stelmach <l.stelmach@...sung.com> wrote:
> >
> > Add bindings for AX88796C SPI Ethernet Adapter.
> >
> > Signed-off-by: Łukasz Stelmach <l.stelmach@...sung.com>
> > ---
> >  .../bindings/net/asix,ax88796c-spi.yaml       | 76 +++++++++++++++++++
> >  .../devicetree/bindings/vendor-prefixes.yaml  |  2 +
> >  2 files changed, 78 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/net/asix,ax88796c-spi.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/net/asix,ax88796c-spi.yaml b/Documentation/devicetree/bindings/net/asix,ax88796c-spi.yaml
> > new file mode 100644
> > index 000000000000..50a488d59dbf
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/asix,ax88796c-spi.yaml
> > @@ -0,0 +1,76 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/net/asix,ax88796c-spi.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: ASIX AX88796C SPI Ethernet Adapter
> > +
> > +allOf:
> > +  - $ref: ethernet-controller.yaml#
> 
> Order of top-level entries please:
> 1. id, schema
> 2. title
> 3. maintainers
> 4. description
> and then allOf. See example-schema.yaml.
> 
> > +
> > +description: |
> > +  ASIX AX88796C is an Ethernet controller with a built in PHY. This
> > +  describes SPI mode of the chip.
> > +
> > +  The node for this driver must be a child node of a SPI controller, hence
> > +  all mandatory properties described in ../spi/spi-bus.txt must be specified.

Did you read spi-bus.txt?

> > +
> > +maintainers:
> > +  - Łukasz Stelmach <l.stelmach@...sung.com>
> > +
> > +properties:
> > +  compatible:
> > +    const: asix,ax99796c-spi

'spi' is implied by the bus the device is on, so drop.

> > +
> > +  reg:
> > +    description:
> > +      SPI device address.
> 
> Skip description, it's trivial.
> 
> > +    maxItems: 1
> > +
> > +  spi-max-frequency:
> > +    maximum: 40000000
> > +
> > +  interrupts:
> > +    description:
> > +     GPIO interrupt to which the chip is connected.
> 
> Skip the description. It's trivial and might be not accurate (does not
> have to be a GPIO).
> 
> > +    maxItems: 1
> > +
> > +  interrupt-parrent:

Typo. But you don't need to list interrupt-parent.

> > +    description:
> > +      A phandle of an interrupt controller.
> 
> Skip description.

> 
> > +    maxItems: 1
> > +
> > +  reset-gpios:
> > +    description:
> > +      A GPIO line handling reset of the chip. As the line is active low,
> > +      it should be marked GPIO_ACTIVE_LOW.
> > +    maxItems: 1
> > +
> > +  local-mac-address: true
> > +
> > +  mac-address: true
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - spi-max-frequency
> > +  - interrupts
> > +  - interrupt-parrent
> > +  - reset-gpios
> 
> Additional properties false.
> 
> > +
> > +examples:
> > +  # Artik5 eval board
> > +  - |
> > +    ax88796c@0 {

ethernet@0

> > +        compatible = "asix,ax88796c";
> > +        local-mac-address = [00 00 00 00 00 00]; /* Filled in by a bootloader */
> > +        interrupt-parent = <&gpx2>;
> > +        interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
> > +        spi-max-frequency = <40000000>;
> > +        reg = <0x0>;
> > +        reset-gpios = <&gpe0 2 GPIO_ACTIVE_LOW>;
> > +        controller-data {

Not documented.

> > +            samsung,spi-feedback-delay = <2>;
> > +        };
> > +    };
> > diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
> > index 2baee2c817c1..5ce5c4a43735 100644
> > --- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
> > +++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
> > @@ -117,6 +117,8 @@ patternProperties:
> >      description: Asahi Kasei Corp.
> >    "^asc,.*":
> >      description: All Sensors Corporation
> > +  "^asix,.*":
> > +    description: ASIX Electronics Corporation
> 
> Separate patch please.
> 
> Best regards,
> Krzysztof
> 
> >    "^aspeed,.*":
> >      description: ASPEED Technology Inc.
> >    "^asus,.*":
> > --
> > 2.26.2
> >