Re: [PATCH] net: fec: add post PHY reset delay DT property

Andrew Lunn
2017-05-22T14:43:08Z

On Mon, May 22, 2017 at 04:00:47PM +0200, Quentin Schulz wrote:
> Hi Andrew
>
> On 22/05/2017 15:57, Andrew Lunn wrote:
> > On Mon, May 22, 2017 at 11:15:17AM +0200, Quentin Schulz wrote:
> >> Some PHY require to wait for a bit after the reset GPIO has been
> >> toggled. This adds support for the DT property `phy-reset-post-delay`
> >> which gives the delay in milliseconds to wait after reset.
> >>
> >> If the DT property is not given, no delay is observed. Post reset delay
> >> greater than 1000ms are invalid and are default to 1ms.
> >
> > Hi Quentin
> >
> > If it is invalid, please return -EINVAL.
> >
>
> Just copying the wording and behavior of phy-reset-duration. Should we
> then change the behavior of phy-reset-duration as well to return -EINVAL
> in that case or I just leave both as is?

No, you cannot change phy-reset-duration. There could be device tree
blobs out in the wild with invalid phy-reset-duration which silently
get converted to 1000ms by the code. You cannot break them.

However, you can prevent new additions which add invalid
phy-reset-post-delay.

Andrew