linux-kernel - RE: [PATCH net-next] dt-bindings: net: xilinx: document xilinx emaclite driver binding

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Date:   Mon, 30 May 2022 13:21:51 +0000
From:   Radhey Shyam Pandey <radheys@...inx.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Radhey Shyam Pandey <radhey.shyam.pandey@....com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "harini.katakam@....com" <harini.katakam@....com>,
        "michal.simek@....com" <michal.simek@....com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "git@....com" <git@....com>
Subject: RE: [PATCH net-next] dt-bindings: net: xilinx: document xilinx
 emaclite driver binding

> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: Saturday, May 21, 2022 9:14 PM
> To: Radhey Shyam Pandey <radhey.shyam.pandey@....com>;
> davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org;
> pabeni@...hat.com; robh+dt@...nel.org; krzysztof.kozlowski+dt@...aro.org;
> harini.katakam@....com; michal.simek@....com
> Cc: netdev@...r.kernel.org; devicetree@...r.kernel.org; linux-
> kernel@...r.kernel.org; git@....com
> Subject: Re: [PATCH net-next] dt-bindings: net: xilinx: document xilinx emaclite
> driver binding
> 
> 
> On 20/05/2022 09:24, Radhey Shyam Pandey wrote:
> > Add basic description for the xilinx emaclite driver DT bindings.
> >
> > Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> > ---
> > Changes since RFC:
> > - Add ethernet-controller yaml reference.
> > - 4 space indent for DTS example.
> > ---
> >  .../bindings/net/xlnx,emaclite.yaml           | 63 +++++++++++++++++++
> >  1 file changed, 63 insertions(+)
> >  create mode 100644
> Documentation/devicetree/bindings/net/xlnx,emaclite.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/net/xlnx,emaclite.yaml
> b/Documentation/devicetree/bindings/net/xlnx,emaclite.yaml
> > new file mode 100644
> > index 000000000000..6105122ad583
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/xlnx,emaclite.yaml
> > @@ -0,0 +1,63 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/net/xlnx,emaclite.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Xilinx Emaclite Ethernet controller
> > +
> > +allOf:
> > +  - $ref: ethernet-controller.yaml#
> 
> This goes just before properties (so after maintainers).

Ok . sure will fix in v2.
> 
> > +
> > +maintainers:
> > +  - Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> > +  - Harini Katakam <harini.katakam@....com>
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - xlnx,opb-ethernetlite-1.01.a
> > +      - xlnx,opb-ethernetlite-1.01.b
> > +      - xlnx,xps-ethernetlite-1.00.a
> > +      - xlnx,xps-ethernetlite-2.00.a
> > +      - xlnx,xps-ethernetlite-2.01.a
> > +      - xlnx,xps-ethernetlite-3.00.a
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  phy-handle: true
> > +
> > +  local-mac-address: true
> > +
> > +  xlnx,tx-ping-pong:
> > +    type: boolean
> > +    description: hardware supports tx ping pong buffer.
> > +
> > +  xlnx,rx-ping-pong:
> > +    type: boolean
> > +    description: hardware supports rx ping pong buffer.
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - phy-handle
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    axi_ethernetlite_1: ethernet@...00000 {
> > +        compatible = "xlnx,xps-ethernetlite-3.00.a";
> > +        interrupt-parent = <&axi_intc_1>;
> > +        interrupts = <1 0>;
> 
> Is "0" an interrupt none type? If yes, then this should be rather a
> define and a proper type, not none.

I looked at axi intc driver and it seems second cell in unused here.
For interrupt type level/edge , interrupt controller has separate
binding "xlnx,kind-of-intr".  So will remove the unused cell.
+        interrupts = <1>;

> 
> > +        local-mac-address = [00 0a 35 00 00 00];
> 
> Each device should get it's own MAC address, right? I understand you
> leave it for bootloader, then just fill it with 0.

The emaclite driver uses of_get_ethdev_address() to get mac from DT.
i.e  'local-mac-address' if present in DT it will be read and this MAC 
address is programmed in the MAC core. So I think it's ok to have a 
user defined mac-address (instead of 0s) here in DT example?
 
> 
> > +        phy-handle = <&phy0>;
> > +        reg = <0x40e00000 0x10000>;
> 
> Put the reg after compatible in DTS code.

Ok, sure will fix it in v2.
> 
> > +        xlnx,rx-ping-pong;
> > +        xlnx,tx-ping-pong;
> > +    };
> 
> 
> Best regards,
> Krzysztof