netdev - Re: [PATCH] net: add init-regs for of

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Message-ID: <53024A62.4050208@codethink.co.uk>
Date:	Mon, 17 Feb 2014 17:44:02 +0000
From:	Ben Dooks <ben.dooks@...ethink.co.uk>
To:	Florian Fainelli <f.fainelli@...il.com>
CC:	netdev <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>
Subject: Re: [PATCH] net: add init-regs for of_phy support

On 17/02/14 17:33, Florian Fainelli wrote:
> Hi Ben,
>
> 2014-02-17 5:08 GMT-08:00 Ben Dooks <ben.dooks@...ethink.co.uk>:
>> Add new init-regs field for of_phy nodes and make sure these
>> get applied when the phy is configured.
>>
>> This allows any phy node in an fdt to initialise registers
>> that may not be set as standard by the driver at initialisation
>> time, such as LED controls.
>>
>> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
>> ---
>>   Documentation/devicetree/bindings/net/phy.txt | 12 ++++++
>>   drivers/net/phy/phy_device.c                  | 59 ++++++++++++++++++++++++++-
>>   2 files changed, 70 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/net/phy.txt b/Documentation/devicetree/bindings/net/phy.txt
>> index 58307d0..48d8ded 100644
>> --- a/Documentation/devicetree/bindings/net/phy.txt
>> +++ b/Documentation/devicetree/bindings/net/phy.txt
>> @@ -20,6 +20,8 @@ Optional Properties:
>>     assume clause 22. The compatible list may also contain other
>>     elements.
>>   - max-speed: Maximum PHY supported speed (10, 100, 1000...)
>> +- init-regs: Set of registers to modify at initialisation as a
>> +    a set of <register set clear>
>
> Should be:
>
> "micrel,led-control-init-val" or something like that.
>
> first cell is the register address, according to the IEEE 802.3 clause 22
> second cell is the set bitmask to apply to the register address
> specified in the first cell
> third cell is the clear bitmask to apply to the register address
> specified in the second cell
>
> I would rather see this as a specific PHY node DT property for setting
> the LED control register, because this is totally non-standard and you
> are touching a proprietary register here.

I'd rather stay with this than splattering lots and lots of
phy specific additions to each phy driver.

This has the plus it lets board developers set registers in
case of board specific initialisation values that are not
already in the drivers.

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius
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