netdev - Re: [PATCH net-next v2 09/10] Documentation: add Device tree bindings for Broadcom GENET

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Date:	Thu, 13 Feb 2014 11:13:28 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"cernekee@...il.com" <cernekee@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH net-next v2 09/10] Documentation: add Device tree
 bindings for Broadcom GENET

On Thu, Feb 13, 2014 at 05:29:54AM +0000, Florian Fainelli wrote:
> This patch adds the Device Tree bindings for the Broadcom GENET Gigabit
> Ethernet controller. A bunch of examples are provided to illustrate the
> versatile aspect of the hardare.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
> Changes since v1:
> - rebased
> 
>  .../devicetree/bindings/net/broadcom-bcmgenet.txt  | 111 +++++++++++++++++++++
>  1 file changed, 111 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/broadcom-bcmgenet.txt
> 
> diff --git a/Documentation/devicetree/bindings/net/broadcom-bcmgenet.txt b/Documentation/devicetree/bindings/net/broadcom-bcmgenet.txt
> new file mode 100644
> index 0000000..93c58e9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/broadcom-bcmgenet.txt
> @@ -0,0 +1,111 @@
> +* Broadcom BCM7xxx Ethernet Controller (GENET)
> +
> +Required properties:
> +- compatible: should be "brcm,genet-v1", "brcm,genet-v2", "brcm,genet-v3",
> +  "brcm,genet-v4".

Presumably "should contain one of" is a better description than "should
be"?

Are the newer revisions compatible with older revisions?

> +- reg: address and length of the register set for the device.
> +- interrupts: interrupt for the device
> +- mdio bus node: this node should always be present regarless of the PHY
> +  configuration of the GENET instance

Nit: a node is not a property, list it after properties.

> +- phy-mode: The interface between the SoC and the PHY (a string that
> +  of_get_phy_mode() can understand).

Do we not have a document under bindings listing these? I really don't
like referring to code in bindings docs.

> +
> +MDIO bus node required properties:
> +
> +- compatible: should be "brcm,genet-v<N>-mdio"

Where N is? Could this not be an explicit list as above? It helps when
searching for bindings.

> +- reg: address and length relative to the parent node base register address

The parent node will require #address-cells and #size-cells too then.

> +- address-cells: address cell for MDIO bus addressing, should be 1
> +- size-cells: size of the cells for MDIO bus addressing, should be 0
> +
> +Optional properties:
> +- phy-handle: A phandle to a phy node defining the PHY address (as the reg
> +  property, a single integer), used to describe configurations where a PHY
> +  (internal or external) is used.

Is there not a phy binding you could refer to instead?

> +
> +- fixed-link: When the GENET interface is connected to a MoCA hardware block
> +  or when operating in a RGMII to RGMII type of connection, or when the
> +  MDIO bus is voluntarily disabled, this property should be used to describe
> +  the "fixed link", the property is described as follows:
> +
> +  fixed-link: <a b c d e> where a is emulated phy id - choose any,
> +  but unique to the all specified fixed-links, b is duplex - 0 half,
> +  1 full, c is link speed - d#10/d#100/d#1000, d is pause - 0 no
> +  pause, 1 pause, e is asym_pause - 0 no asym_pause, 1 asym_pause.

Is this not documented elsewhere such that it can be referred to?

> +
> +Internal Gigabit PHY example:
> +
> +ethernet@...60000 {
> +	phy-mode = "internal";
> +	phy-handle = <&phy1>;
> +	mac-address = [ 00 10 18 36 23 1a ];
> +	compatible = "brcm,genet-v4";
> +	#address-cells = <0x1>;
> +	#size-cells = <0x1>;
> +	device_type = "ethernet";

What's this needed by? I can't see any other devices with this
device_type, and I was under the impression that we didn't want new
device_type properties cropping up.

> +	reg = <0xf0b60000 0xfc4c>;
> +	interrupts = <0x0 0x14 0x0 0x0 0x15 0x0>;

How many? The binding implied only one, and I'm not away of any
interrupt controller bindings with #interrupt-cells = <6>.

Cheers,
Mark.
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