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Date: Sat, 9 Apr 2022 01:40:15 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: Prasanna Vengateshan <prasanna.vengateshan@...rochip.com>
Cc: andrew@...n.ch, netdev@...r.kernel.org, robh+dt@...nel.org,
UNGLinuxDriver@...rochip.com, woojung.huh@...rochip.com,
hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
kuba@...nel.org, linux-kernel@...r.kernel.org,
vivien.didelot@...il.com, f.fainelli@...il.com,
devicetree@...r.kernel.org, pabeni@...hat.com,
Rob Herring <robh@...nel.org>
Subject: Re: [RFC PATCH v11 net-next 02/10] dt-bindings: net: dsa: dt
bindings for microchip lan937x
On Fri, Mar 25, 2022 at 10:23:33PM +0530, Prasanna Vengateshan wrote:
> Documentation in .yaml format and updates to the MAINTAINERS
> Also 'make dt_binding_check' is passed.
>
> RGMII internal delay values for the mac is retrieved from
> rx-internal-delay-ps & tx-internal-delay-ps as per the feedback from
> v3 patch series.
> https://lore.kernel.org/netdev/20210802121550.gqgbipqdvp5x76ii@skbuf/
>
> It supports only the delay value of 0ns and 2ns.
>
> Signed-off-by: Prasanna Vengateshan <prasanna.vengateshan@...rochip.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
> .../bindings/net/dsa/microchip,lan937x.yaml | 160 ++++++++++++++++++
> MAINTAINERS | 1 +
> 2 files changed, 161 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/net/dsa/microchip,lan937x.yaml
>
> diff --git a/Documentation/devicetree/bindings/net/dsa/microchip,lan937x.yaml b/Documentation/devicetree/bindings/net/dsa/microchip,lan937x.yaml
> new file mode 100644
> index 000000000000..8974506d8f69
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/dsa/microchip,lan937x.yaml
> @@ -0,0 +1,160 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/dsa/microchip,lan937x.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: LAN937x Ethernet Switch Series Tree Bindings
> +
> +maintainers:
> + - UNGLinuxDriver@...rochip.com
> +
> +allOf:
> + - $ref: dsa.yaml#
> +
> +properties:
> + compatible:
> + enum:
> + - microchip,lan9370
> + - microchip,lan9371
> + - microchip,lan9372
> + - microchip,lan9373
> + - microchip,lan9374
> +
> + reg:
> + maxItems: 1
> +
> + spi-max-frequency:
> + maximum: 50000000
> +
> + reset-gpios:
> + description: Optional gpio specifier for a reset line
> + maxItems: 1
> +
> + mdio:
> + $ref: /schemas/net/mdio.yaml#
> + unevaluatedProperties: false
> +
> + tx-internal-delay-ps:
> + enum: [0, 2000]
> + default: 0
> +
> + rx-internal-delay-ps:
> + enum: [0, 2000]
> + default: 0
Why are "tx-internal-delay-ps" and "rx-internal-delay-ps" properties of
the switch node and not of individual port nodes?
> +
> +required:
> + - compatible
> + - reg
> +
> +unevaluatedProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/gpio/gpio.h>
> +
> + //Ethernet switch connected via spi to the host
Comment seems off, this node doesn't correspond to an Ethernet switch
but to the DSA master.
> + ethernet {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + fixed-link {
> + speed = <1000>;
> + full-duplex;
> + };
> + };
> +
> + spi {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + lan9374: switch@0 {
> + compatible = "microchip,lan9374";
> + reg = <0>;
> +
> + spi-max-frequency = <44000000>;
> +
> + ethernet-ports {
> + #address-cells = <1>;
> + #size-cells = <0>;
Some blank lines here and there to separate the nodes from the
properties and from each other would go a long way. Similarly,
properties don't need new lines between each other ("reg" and
"spi-max-frequency").
> + port@0 {
> + reg = <0>;
> + label = "lan1";
> + phy-mode = "internal";
> + phy-handle = <&t1phy0>;
> + };
> + port@1 {
> + reg = <1>;
> + label = "lan2";
> + phy-mode = "internal";
> + phy-handle = <&t1phy1>;
> + };
> + port@2 {
> + reg = <2>;
> + label = "lan4";
> + phy-mode = "internal";
> + phy-handle = <&t1phy2>;
> + };
> + port@3 {
> + reg = <3>;
> + label = "lan6";
> + phy-mode = "internal";
> + phy-handle = <&t1phy3>;
> + };
> + port@4 {
> + reg = <4>;
> + phy-mode = "rgmii";
> + ethernet = <ðernet>;
shouldn't the "ethernet" node have a label for this to work? Does this
example compile?
> + fixed-link {
> + speed = <1000>;
> + full-duplex;
> + };
> + };
> + port@5 {
> + reg = <5>;
> + label = "lan7";
> + phy-mode = "rgmii";
> + fixed-link {
> + speed = <1000>;
> + full-duplex;
> + };
> + };
> + port@6 {
> + reg = <6>;
> + label = "lan5";
> + phy-mode = "internal";
> + phy-handle = <&t1phy6>;
> + };
> + port@7 {
> + reg = <7>;
> + label = "lan3";
> + phy-mode = "internal";
> + phy-handle = <&t1phy7>;
> + };
> + };
> +
> + mdio {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + t1phy0: ethernet-phy@0{
> + reg = <0x0>;
> + };
> + t1phy1: ethernet-phy@1{
> + reg = <0x1>;
> + };
> + t1phy2: ethernet-phy@2{
> + reg = <0x2>;
> + };
> + t1phy3: ethernet-phy@3{
> + reg = <0x3>;
> + };
> + t1phy6: ethernet-phy@6{
> + reg = <0x6>;
> + };
> + t1phy7: ethernet-phy@7{
> + reg = <0x7>;
> + };
> + };
> + };
> + };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 91c04cb65247..373eaee3c8b9 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -12719,6 +12719,7 @@ M: UNGLinuxDriver@...rochip.com
> L: netdev@...r.kernel.org
> S: Maintained
> F: Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml
> +F: Documentation/devicetree/bindings/net/dsa/microchip,lan937x.yaml
> F: drivers/net/dsa/microchip/*
> F: include/linux/platform_data/microchip-ksz.h
> F: net/dsa/tag_ksz.c
> --
> 2.30.2
>
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