[PATCH 3/3] arm: dts: k3-am62: Bump dtsi from linux v6.5-rc1

[Maxime Ripard]

On Wed, Jul 26, 2023 at 11:26:05AM +0530, Ravi Gunasekaran wrote:
> On 7/25/23 11:47 PM, Tom Rini wrote:
> > On Tue, Jul 25, 2023 at 09:09:34AM -0500, Nishanth Menon wrote:
> >> On 15:56-20230725, Maxime Ripard wrote:
> >>> Hi,
> >>>
> >>> On Tue, Jul 25, 2023 at 07:58:56AM -0500, Nishanth Menon wrote:
> >>>> Update the am62 and am625 device-trees from linux v6.3-rc5 This needed the followin
> >>>> tweaks to the u-boot specific dtsi as well:
> >>>> - Switch tick-timer to the main_timer as it's now defined in the main dtsi
> >>>> - Secure proxies are defined in Soc dtsis
> >>>> - Drop duplicate nodes - u-boot.dtsi is includes in r5-sk, no need for
> >>>>   either the definitions from main.dtsi OR duplication from u-boot.dtsi
> >>>> - Add mdio pins to the cpsw3g pinctrl in u-boot dtsi. It moved to a subnode in the
> >>>>   linux dtsi that u-boot doesn't use/support
> >>>>
> >>>> Cc: Francesco Dolcini <francesco at dolcini.it>
> >>>> Cc: Sjoerd Simons <sjoerd at collabora.com>
> >>>> Cc: Wadim Egorov <w.egorov at phytec.de>
> >>>> Signed-off-by: Nishanth Menon <nm at ti.com>
> >>>> ---
> >>>>
> >>>> I decided not to pick up changes from Roger and Maxime as they are'nt
> >>>> regression fixes, instead the fixups can be done on top of the basic
> >>>> sync.
> >>>
> >>> This breaks Linux network interfaces so I very much considers this a regression.
> >> The current u-boot.dtsi I am confused - pinctrl mdio is still a
> >> problem, is'nt it?
> >> https://github.com/u-boot/u-boot/blob/master/arch/arm/dts/k3-am625-sk-u-boot.dtsi#L132
> >> The follow on fixups from both your and Roger's series should fix things
> >> up, correct?
> > 
> > I'm a little confused here too.  For each of these cases, what happens?
> > - Today, one of these platforms, we pass the kernel the in-memory U-Boot
> >   device tree.  And if this is functional for networking, how/why?
> 
> In here, the mdio pinctrl configuration is present only in one node (CPSW).
> So there is no conflict when the in-memory DT is passed by U-Boot to kernel.
> 
> > - "Tomorrow", one of these platforms, with Nishanth's series applied, we
> >   pass the in-memory U-Boot device tree
> 
> In this case, the DT passed by U-Boot has the mdio pinctrl info present in
> two nodes - one in CPSW and other in MDIO. This causes failure in Linux as
> both nodes refer to same pinctrl configuration.

Yeah, exactly. The "Tomorrow" case probably makes it functional for
U-Boot but breaks Linux in the process. It was functional in Linux
before because it has everything needed to set up the network and didn't
rely on U-Boot for that at all.

Maxime
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