linux-kernel - Re: [PATCH] Documentation/devicetree: document cavium-pip rx-delay/tx-delay properties

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Date:	Thu, 9 Jun 2016 14:03:05 -0500
From:	Rob Herring <robh@...nel.org>
To:	Aaro Koskinen <aaro.koskinen@....fi>
Cc:	David Daney <ddaney.cavm@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Documentation/devicetree: document cavium-pip
 rx-delay/tx-delay properties

On Wed, Jun 8, 2016 at 2:51 PM, Aaro Koskinen <aaro.koskinen@....fi> wrote:
> Hi,
>
> On Wed, Jun 08, 2016 at 02:18:42PM -0500, Rob Herring wrote:
>> On Sun, Jun 05, 2016 at 01:24:02AM +0300, Aaro Koskinen wrote:
>> > Document cavium-pip rx-delay/tx-delay properties. Currently the board
>> > specific values need to be hardcoded in the platform code, which we
>> > want to avoid when moving to DT-only booting.
>> >
>> > Signed-off-by: Aaro Koskinen <aaro.koskinen@....fi>
>> > ---
>> >  Documentation/devicetree/bindings/net/cavium-pip.txt | 4 ++++
>> >  1 file changed, 4 insertions(+)
>> >
>> > diff --git a/Documentation/devicetree/bindings/net/cavium-pip.txt b/Documentation/devicetree/bindings/net/cavium-pip.txt
>> > index 7dbd158..edbf411 100644
>> > --- a/Documentation/devicetree/bindings/net/cavium-pip.txt
>> > +++ b/Documentation/devicetree/bindings/net/cavium-pip.txt
>> > @@ -37,6 +37,10 @@ Properties for PIP port which is a child the PIP interface:
>> >
>> >  - phy-handle: Optional, see ethernet.txt file in the same directory.
>> >
>> > +- rx-delay: Delay value for RGMII receive clock. Optional. Disabled if 0.
>> > +
>> > +- tx-delay: Delay value for RGMII transmit clock. Optional. Disabled if 0.
>>
>> What are the units? Use standard unit suffix if in ns, us, etc.
>
> This is a raw register value, and the mapping to actual delay varies
> depending on HW, AFAIK.

Then state that in the description.

Rob