Re: [PATCH net-next 2/3] dt-bindings: net: micrel: Configure latency values and timestamping check for LAN8814 phy

[Richard Cochran]

On Sat, Mar 12, 2022 at 09:04:31PM +0100, Andrew Lunn wrote:
> Do these get passed to the kernel so the hardware can act on them, or
> are they used purely in userspace by ptp4l?

user space only.
 
> If they has passed to the kernel, could we provide a getter as well as
> a setter, so the defaults hard coded in the driver can be read back?

Any hard coded defaults in the kernel are a nuisance.

I mean, do you want user space to say,

   "okay, so I know the correct value is X.  But the drivers may offer
   random values according to kernel version.  So, I'll read out the
   driver value Y, and then apply X-Y."

Insanity.

(not to mention that this fails for older kernels without the proposed
interface)

Thanks,
Richard