lkml.org 
[lkml]   [2010]   [Nov]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/2] of/phylib: Use device tree properties to initialize Marvell PHYs.
On Thu, Nov 18, 2010 at 03:48:38PM -0800, David Daney wrote:
> On 11/18/2010 12:40 PM, Grant Likely wrote:
> >On Wed, Nov 17, 2010 at 03:54:30PM -0800, David Daney wrote:
> >>Some aspects of PHY initialization are board dependent, things like
> >>indicator LED connections and some clocking modes cannot be determined
> >>by probing. The dev_flags element of struct phy_device can be used to
> >>control these things if an appropriate value can be passed from the
> >>Ethernet driver. We run into problems however if the PHY connections
> >>are specified by the device tree. There is no way for the Ethernet
> >>driver to know what flags it should pass.
> >>
> >>If we are using the device tree, the struct phy_device will be
> >>populated with the device tree node corresponding to the PHY, and we
> >>can extract extra configuration information from there.
> >>
> >>The next question is what should the format of that information be?
> >>It is highly device specific, and the device tree representation
> >>should not be tied to any arbitrary kernel defined constants. A
> >>straight forward representation is just to specify the exact bits that
> >>should be set using the "marvell,reg-init" property:
> >>
> >> phy5: ethernet-phy@5 {
> >> reg =<5>;
> >> device_type = "ethernet-phy";
> >
> >Some notes:
> >- device_type is only relevant for real openfirmware platforms. It
> > should not appear in dts files.
>
> Documentation/powerpc/dts-bindings/phy.txt says device_type should
> be here. I can remove it from my patch comment, but should it also
> be removed from the phy.txt file?

Heh, I didn't realize it was there. Yes, it should be removed from
the phy.txt file. It is clearly wrong.

>
> >- This example phy node needs a compatible property
>
> Ok, what would you suggest? Something like:
>
> compatible = "marvell,88e1145";

Yes.

>
> I can certainly do that, but I would note that the kernel probes
> these things and would completely ignore the compatible property.

That's okay.

>
> >- This new binding needs to be documented. You can use devicetree.org.
> >
>
> Agreed, I was planning to do that once the patch was approved.
>
> Where would that go? Vendor:Marvell, or
> Type:PHY/compatible=marvell,* ... or somewhere else?

The page name should be compatible=marvell,88e1145, and it should be
have the vendor and type tags added so it appears in the category
pages.

g.


\
 
 \ /
  Last update: 2010-11-19 01:41    [W:1.956 / U:0.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site