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Date:   Mon, 10 Oct 2016 10:15:39 -0500
From:   Rob Herring <robh@...nel.org>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Corentin Labbe <clabbe.montjoie@...il.com>, mark.rutland@....com,
        wens@...e.org, linux@...linux.org.uk, davem@...emloft.net,
        f.fainelli@...il.com, andrew@...n.ch, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 03/10] ARM: sun8i: dt: Add DT bindings documentation
 for Allwinner sun8i-emac

On Mon, Oct 10, 2016 at 02:30:23PM +0200, Maxime Ripard wrote:
> On Fri, Oct 07, 2016 at 10:25:50AM +0200, Corentin Labbe wrote:
> > This patch adds documentation for Device-Tree bindings for the
> > Allwinner sun8i-emac driver.
> > 
> > Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
> > ---
> >  .../bindings/net/allwinner,sun8i-emac.txt          | 70 ++++++++++++++++++++++
> >  1 file changed, 70 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/net/allwinner,sun8i-emac.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/net/allwinner,sun8i-emac.txt b/Documentation/devicetree/bindings/net/allwinner,sun8i-emac.txt
> > new file mode 100644
> > index 0000000..92e4ef3b
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/allwinner,sun8i-emac.txt
> > @@ -0,0 +1,70 @@
> > +* Allwinner sun8i EMAC ethernet controller
> > +
> > +Required properties:
> > +- compatible: should be one of the following string:
> > +		"allwinner,sun8i-a83t-emac"
> > +		"allwinner,sun8i-h3-emac"
> > +		"allwinner,sun50i-a64-emac"
> > +- reg: address and length of the register for the device.
> > +- syscon: A phandle to the syscon of the SoC
> > +- interrupts: interrupt for the device
> > +- clocks: A phandle to the reference clock for this device
> > +- clock-names: should be "ahb"
> > +- resets: A phandle to the reset control for this device
> > +- reset-names: should be "ahb"
> > +- phy-mode: See ethernet.txt
> > +- phy-handle: See ethernet.txt
> > +- #address-cells: shall be 1
> > +- #size-cells: shall be 0
> > +
> > +Optional properties:
> > +- allwinner,tx-delay: TX clock delay chain value. Range value is 0-0x07. Default is 0)
> > +- allwinner,rx-delay: RX clock delay chain value. Range value is 0-0x1F. Default is 0)
> > +Both delay properties does not have units, there are arbitrary value.
> > +The TX/RX clock delay chain settings are board specific and could be found
> > +in vendor FEX files.
> > +
> > +Optional properties for "allwinner,sun8i-h3-emac":
> > +- allwinner,leds-active-low: EPHY LEDs are active low
> > +
> > +Required child node of emac:
> > +- mdio bus node: should be named mdio
> > +
> > +Required properties of the mdio node:
> > +- #address-cells: shall be 1
> > +- #size-cells: shall be 0
> > +
> > +The device node referenced by "phy" or "phy-handle" should be a child node
> > +of the mdio node. See phy.txt for the generic PHY bindings.
> > +
> > +Required properties of the phy node with "allwinner,sun8i-h3-emac":
> > +- clocks: an extra phandle to the reference clock for the EPHY
> > +- resets: an extra phandle to the reset control for the EPHY
> > +
> > +Example:
> > +
> > +emac: ethernet@...0b000 {
> > +	compatible = "allwinner,sun8i-h3-emac";
> > +	syscon = <&syscon>;
> > +	reg = <0x01c0b000 0x104>;
> > +	interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>;
> > +	resets = <&ccu RST_BUS_EMAC>;
> > +	reset-names = "ahb";
> > +	clocks = <&ccu CLK_BUS_EMAC>;
> > +	clock-names = "ahb";
> > +	#address-cells = <1>;
> > +	#size-cells = <0>;
> > +
> > +	phy = <&int_mii_phy>;
> > +	phy-mode = "mii";
> > +	allwinner,leds-active-low;
> > +	mdio: mdio {
> > +		#address-cells = <1>;
> > +		#size-cells = <0>;
> > +		int_mii_phy: ethernet-phy@1 {
> > +			reg = <1>;
> > +			clocks = <&ccu CLK_BUS_EPHY>;
> > +			resets = <&ccu RST_BUS_EPHY>;
> 
> That works for me, let's see how the DT maintainers feel about it.

The phy should have a compatible string since you have extra properties.

Rob

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