Re: [PATCH v1 2/2] of: property: fw_devlink: Add support for "phy-handle" property

On Mon, Aug 16, 2021 at 2:11 PM Rob Herring [off-list ref] wrote:

On Mon, Aug 16, 2021 at 3:43 PM Saravana Kannan [off-list ref] wrote:

quoted

On Sat, Aug 14, 2021 at 8:22 AM Andrew Lunn [off-list ref] wrote:

quoted

Hi Saravana

quoted

Hi Andrew,

quoted

Also there
are so many phy related properties that my head is spinning. Is there a
"phy" property (which is different from "phys") that treated exactly as
"phy-handle"?

Sorry, i don't understand your question.

Sorry. I was just saying I understand the "phy-handle" DT property
(seems specific to ethernet PHY) and "phys" DT property (seems to be
for generic PHYs -- used mostly by display and USB?). But I noticed
there's yet another "phy" DT property which I'm not sure I understand.
It seems to be used by display and ethernet and seems to be a
deprecated property. If you can explain that DT property in the
context of networking and how to interpret it as a human, that'd be
nice.

For net devices, you can have 2 PHYs. 'phys' is the serdes phy and
'phy-handle' is the ethernet (typically) phy. On some chips, a serdes
phy can do PCS (ethernet), SATA, PCIe.

'phy' is deprecated, so ignore it. The one case for displays I see in
display/exynos/exynos_hdmi.txt should be deprecated as well.

There's also 'usb-phy' which should be deprecated.

Thanks for the explanation Rob. I'll ignore phy and usb-phy unless it
becomes an issue for any future changes/improvements.

-Saravana


-Saravana