netdev - Re: [PATCH 1/3][v2] net: phy: introduce 1000BASE-KX and 10GBASE-KR

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Message-ID: <20160114164418.GD19773@lunn.ch>
Date:	Thu, 14 Jan 2016 17:44:18 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	shh.xie@...il.com
Cc:	devicetree@...r.kernel.org, netdev@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, f.fainelli@...il.com,
	davem@...emloft.net, Shaohui Xie <Shaohui.Xie@...escale.com>
Subject: Re: [PATCH 1/3][v2] net: phy: introduce 1000BASE-KX and 10GBASE-KR

On Thu, Jan 14, 2016 at 04:23:59PM +0800, shh.xie@...il.com wrote:
> From: Shaohui Xie <Shaohui.Xie@...escale.com>
> 
> This commit adds necessary definitions for the PHY layer to recognize
> backplane Ethernet 1000BASE-KX and 10GBASE-KR as valid PHY interfaces,
> "1000base-kx" for 1000BASE-KX, "10gbase-kr" for 10GBASE-KR.
> 
> Signed-off-by: Shaohui Xie <Shaohui.Xie@...escale.com>
> ---
> changes in v2:
> new patch.
> 
>  Documentation/devicetree/bindings/net/ethernet.txt | 4 ++--
>  include/linux/phy.h                                | 6 ++++++
>  2 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/ethernet.txt b/Documentation/devicetree/bindings/net/ethernet.txt
> index 5d88f37..1166a5c 100644
> --- a/Documentation/devicetree/bindings/net/ethernet.txt
> +++ b/Documentation/devicetree/bindings/net/ethernet.txt
> @@ -11,8 +11,8 @@ The following properties are common to the Ethernet controllers:
>    the maximum frame size (there's contradiction in ePAPR).
>  - phy-mode: string, operation mode of the PHY interface; supported values are
>    "mii", "gmii", "sgmii", "qsgmii", "tbi", "rev-mii", "rmii", "rgmii", "rgmii-id",
> -  "rgmii-rxid", "rgmii-txid", "rtbi", "smii", "xgmii"; this is now a de-facto
> -  standard property;
> +  "rgmii-rxid", "rgmii-txid", "rtbi", "smii", "xgmii", "1000base-kx", "10gbase-kr";
> +  this is now a de-facto standard property;

I know very little about this, so i'm just asking a question. None of
the other interface modes contain a bit rate. So is the bit rate
needed for your two new modes?

With a bit of googling, K means copper backplane, X means 4B/5B and R
means 64B/66B. Could there be a 10Gbps KX? a 1GBps KR? Do we actually
need the speed here, or is kx and kr sufficient?

     Thanks
	Andrew