netdev - Re: [PATCH 04/21] ARM: sun8i: dt: Add DT bindings documentation for Allwinner dwmac-sun8i

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Message-ID: <783a717d-f1f4-e265-bf94-0b3080cea542@gmail.com>
Date:   Thu, 16 Feb 2017 12:58:46 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Corentin Labbe <clabbe.montjoie@...il.com>, peppe.cavallaro@...com,
        robh+dt@...nel.org, mark.rutland@....com,
        maxime.ripard@...e-electrons.com, wens@...e.org,
        linux@...linux.org.uk, catalin.marinas@....com,
        will.deacon@....com, alexandre.torgue@...com
Cc:     devicetree@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 04/21] ARM: sun8i: dt: Add DT bindings documentation for
 Allwinner dwmac-sun8i

On 02/16/2017 04:48 AM, Corentin Labbe wrote:
> This patch adds documentation for Device-Tree bindings for the
> Allwinner dwmac-sun8i driver.
> 
> Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
> ---
>  .../devicetree/bindings/net/dwmac-sun8i.txt        | 86 ++++++++++++++++++++++
>  1 file changed, 86 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/dwmac-sun8i.txt
> 
> diff --git a/Documentation/devicetree/bindings/net/dwmac-sun8i.txt b/Documentation/devicetree/bindings/net/dwmac-sun8i.txt
> new file mode 100644
> index 0000000..ac806c6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/dwmac-sun8i.txt
> @@ -0,0 +1,86 @@
> +* Allwinner sun8i GMAC ethernet controller
> +
> +This device is a platform glue layer for stmmac.
> +Please see stmmac.txt for the other unchanged properties.
> +
> +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.
> +- interrupts: interrupt for the device
> +- interrupt-names: should be "macirq"
> +- clocks: A phandle to the reference clock for this device
> +- clock-names: should be "stmmaceth"
> +- resets: A phandle to the reset control for this device
> +- reset-names: should be "stmmaceth"
> +- phy-mode: See ethernet.txt
> +- phy-handle: See ethernet.txt
> +- #address-cells: shall be 1
> +- #size-cells: shall be 0
> +- syscon: A phandle to the syscon of the SoC with one of the following
> + compatible string:
> +  - allwinner,sun8i-h3-system-controller
> +  - allwinner,sun8i-a64-system-controller
> +  - allwinner,sun8i-a83t-system-controller
> +
> +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)

Delays should be specified in nanosecond units, and should not be a
value that maps directly to a HW register value, you need to convert the
property value into the appropriate register value.

> +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

Are you sure this is appropriate at the MAC node level and this is not
something that follows the PHY instead?

> +
> +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

s/an extra/a phandle/

> +- resets: an extra phandle to the reset control for the EPHY
> +
> +Required properties for the system controller:
> +- reg: address and length of the register for the device.
> +- compatible: should be "syscon" and one of the following string:
> +		"allwinner,sun8i-h3-system-controller"
> +		"allwinner,sun8i-a64-system-controller"
> +		"allwinner,sun8i-a83t-system-controller"
> +
> +Example:
> +
> +emac: ethernet@...b000 {
> +	compatible = "allwinner,sun8i-h3-emac";
> +	syscon = <&syscon>;
> +	reg = <0x01c0b000 0x104>;
> +	interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>;
> +	interrupt-names = "macirq";
> +	resets = <&ccu RST_BUS_EMAC>;
> +	reset-names = "stmmaceth";
> +	clocks = <&ccu CLK_BUS_EMAC>;
> +	clock-names = "stmmaceth";
> +	#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>;
> +		};
> +	};
> +};
> 


-- 
Florian