linux-kernel - Re: [PATCH v1 2/4] dt-bindings: net: dsa: qca,ar9331 switch documentation

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Date:   Wed, 16 Oct 2019 14:40:15 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Chris Snook <chris.snook@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        James Hogan <jhogan@...nel.org>,
        Jay Cliburn <jcliburn@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Paul Burton <paul.burton@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH v1 2/4] dt-bindings: net: dsa: qca,ar9331 switch
 documentation

On Wed, Oct 16, 2019 at 02:21:52PM +0200, Andrew Lunn wrote:
> On Mon, Oct 14, 2019 at 08:15:47AM +0200, Oleksij Rempel wrote:
> > Atheros AR9331 has built-in 5 port switch. The switch can be configured
> > to use all 5 or 4 ports. One of built-in PHYs can be used by first built-in
> > ethernet controller or to be used directly by the switch over second ethernet
> > controller.
> > 
> > Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> > ---
> >  .../devicetree/bindings/net/dsa/ar9331.txt    | 155 ++++++++++++++++++
> >  1 file changed, 155 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/net/dsa/ar9331.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/net/dsa/ar9331.txt b/Documentation/devicetree/bindings/net/dsa/ar9331.txt
> > new file mode 100644
> > index 000000000000..b0f95fd19584
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/dsa/ar9331.txt
> > @@ -0,0 +1,155 @@
> > +Atheros AR9331 built-in switch
> > +=============================
> > +
> > +It is a switch built-in to Atheros AR9331 WiSoC and addressable over internal
> > +MDIO bus. All PHYs are build-in as well. 
> > +
> > +Required properties:
> > +
> > + - compatible: should be: "qca,ar9331-switch" 
> > + - reg: Address on the MII bus for the switch.
> > + - resets : Must contain an entry for each entry in reset-names.
> > + - reset-names : Must include the following entries: "switch"
> > + - interrupt-parent: Phandle to the parent interrupt controller
> > + - interrupts: IRQ line for the switch
> > + - interrupt-controller: Indicates the switch is itself an interrupt
> > +   controller. This is used for the PHY interrupts.
> > + - #interrupt-cells: must be 1
> > + - mdio: Container of PHY and devices on the switches MDIO bus.
> > +
> > +See Documentation/devicetree/bindings/net/dsa/dsa.txt for a list of additional
> > +required and optional properties.
> > +Examples:
> > +
> > +eth0: ethernet@...00000 {
> > +	compatible = "qca,ar9330-eth";
> > +	reg = <0x19000000 0x200>;
> > +	interrupts = <4>;
> > +
> > +	resets = <&rst 9>, <&rst 22>;
> > +	reset-names = "mac", "mdio";
> > +	clocks = <&pll ATH79_CLK_AHB>, <&pll ATH79_CLK_AHB>;
> > +	clock-names = "eth", "mdio";
> > +
> > +	phy-mode = "mii";
> > +	phy-handle = <&phy_port4>;
> 
> This does not seem like a valid example. If phy_port4 is listed here,
> i would expect switch_port 5 to be totally missing?

hm... right.
phy4 can be used with switch_port 5 or eth0. Should i remove completely
switch_port 5 node or it is enough to "disable" it.

> > +};
> > +
> > +eth1: ethernet@...00000 {
> > +	compatible = "qca,ar9330-eth";
> > +	reg = <0x1a000000 0x200>;
> > +	interrupts = <5>;
> > +	resets = <&rst 13>, <&rst 23>;
> > +	reset-names = "mac", "mdio";
> > +	clocks = <&pll ATH79_CLK_AHB>, <&pll ATH79_CLK_AHB>;
> > +	clock-names = "eth", "mdio";
> > +
> > +	phy-mode = "gmii";
> > +	phy-handle = <&switch_port0>;
> > +
> > +	fixed-link {
> > +		speed = <1000>;
> > +		full-duplex;
> > +	};
> 
> You also cannot have both a fixed-link and a phy-handle.

ok.

> 
> > +
> > +	mdio {
> > +		#address-cells = <1>;
> > +		#size-cells = <0>;
> > +
> > +		switch10: switch@10 {
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +
> > +			compatible = "qca,ar9331-switch";
> > +			reg = <16>;
> 
> Maybe don't mix up hex and decimal? switch16: switch@16.

ok. will fix it. What is actually proper way to set the reg of switch?
This switch is responding on range of phy addresses: any of two high bits of 5
bit phy address.

Regards,
Oleksij

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