netdev - Re: [PATCH net v4 3/3] Documentation: networking: phy.txt: Update text for indirect MMD access

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Date:	Mon, 30 Jun 2014 15:54:27 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Vince Bridgers <vbridgers2013@...il.com>
Cc:	Randy Dunlap <rdunlap@...radead.org>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, vbridger@...era.com
Subject: Re: [PATCH net v4 3/3] Documentation: networking: phy.txt: Update
 text for indirect MMD access

2014-06-29 18:35 GMT-07:00 Vince Bridgers <vbridgers2013@...il.com>:
> Update the PHY library documentation to describe how a specific PHY
> driver can use the PAL MMD register access routines or override those
> routines with it's own in the event the PHY does not support the IEEE
> standard for reading and writing MMD phy registers.
>
> Signed-off-by: Vince Bridgers <vbridgers2013@...il.com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>

> ---
> V4: None
> V3: Add modified Documentation/networking/phy.txt per review comments.
> ---
>  Documentation/networking/phy.txt |   18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/networking/phy.txt b/Documentation/networking/phy.txt
> index 3544c98..326836a 100644
> --- a/Documentation/networking/phy.txt
> +++ b/Documentation/networking/phy.txt
> @@ -272,6 +272,8 @@ Writing a PHY driver
>     txtsamp: Requests a transmit timestamp at the PHY level for a 'skb'
>     set_wol: Enable Wake-on-LAN at the PHY level
>     get_wol: Get the Wake-on-LAN status at the PHY level
> +   rd_mmd_indirect: Read PHY MMD indirect register
> +   wr_mmd_indirect: Write PHY MMD indirect register
>
>   Of these, only config_aneg and read_status are required to be
>   assigned by the driver code.  The rest are optional.  Also, it is
> @@ -284,7 +286,21 @@ Writing a PHY driver
>
>   Feel free to look at the Marvell, Cicada, and Davicom drivers in
>   drivers/net/phy/ for examples (the lxt and qsemi drivers have
> - not been tested as of this writing)
> + not been tested as of this writing).
> +
> + The PHY's MMD register accesses are handled by the PAL framework
> + by default, but can be overridden by a specific PHY driver if
> + required. This could be the case if a PHY was released for
> + manufacturing before the MMD PHY register definitions were
> + standardized by the IEEE. Most modern PHYs will be able to use
> + the generic PAL framework for accessing the PHY's MMD registers.
> + An example of such usage is for Energy Efficient Ethernet support,
> + implemented in the PAL. This support uses the PAL to access MMD
> + registers for EEE query and configuration if the PHY supports
> + the IEEE standard access mechanisms, or can use the PHY's specific
> + access interfaces if overridden by the specific PHY driver. See
> + the Micrel driver in drivers/net/phy/ for an example of how this
> + can be implemented.
>
>  Board Fixups
>
> --
> 1.7.9.5
>



-- 
Florian
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