netdev - Re: [PATCHv2 net-next] dsa: Support multiple MDIO busses

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Date:	Sun, 9 Aug 2015 20:26:42 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	David Miller <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCHv2 net-next] dsa: Support multiple MDIO busses

On 8/9/2015 5:20 PM, Andrew Lunn wrote:

>>> When using a cluster of switches, some topologies will have an MDIO
>>> bus per switch, not one for the whole cluster. Allow this to be
>>> represented in the device tree, by adding an optional mii-bus property
>>> at the switch level.

>>> Signed-off-by: Andrew Lunn <andrew@...n.ch>
>>> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
>>> ---

>>> v2: Fix documentation, which placed the properties documentation in
>>>      the wrong place.
>>> ---
>>>   Documentation/devicetree/bindings/net/dsa/dsa.txt |  5 +++++
>>>   net/dsa/dsa.c                                     | 12 +++++++++++-
>>>   2 files changed, 16 insertions(+), 1 deletion(-)

>>> diff --git a/Documentation/devicetree/bindings/net/dsa/dsa.txt b/Documentation/devicetree/bindings/net/dsa/dsa.txt
>>> index f0b4cd72411d..fc06f4a7c788 100644
>>> --- a/Documentation/devicetree/bindings/net/dsa/dsa.txt
>>> +++ b/Documentation/devicetree/bindings/net/dsa/dsa.txt
>>> @@ -32,6 +32,10 @@ A switch child node has the following optional property:
>>>   			  the presence and/or size of a connected EEPROM,
>>>   			  otherwise optional.
>>>
>>> +- mii-bus		: Should be a phandle to a valid MDIO bus device node.

>>     Why not call it "mdio-bus"?

> Hi Sergei

> What you cannot see in this hunk, but can in the file is:

> Marvell Distributed Switch Architecture Device Tree Bindings
> ------------------------------------------------------------

> Required properties:
> - compatible            : Should be "marvell,dsa"
> - #address-cells        : Must be 2, first cell is the address on the MDIO bus
>                            and second cell is the address in the switch tree.
>                            Second cell is used only when cascading/chaining.
> - #size-cells           : Must be 0
> - dsa,ethernet          : Should be a phandle to a valid Ethernet device node
> - dsa,mii-bus           : Should be a phandle to a valid MDIO bus device node
>
> The optional mii-bus properties i'm adding should be used in
> preference to this global one, for this switch. Keeping the names the
> same makes sense. But i did drop the dsa prefix to indicate it is
> local, not global scope,

    Dropping a vendor prefix usually means that it's (standardized) common 
property name. I don't know where you took the "local" scope thing...

> and all the other properties at switch level
> do not use the dsa prefix.

>      Andrew

MBR, Sergei

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