linux-kernel - Re: [PATCH v3 2/2] arm64: dts: ti: Add k3-am67a-beagley-ai

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Message-ID: <CAOCHtYg2hEYZVQ-5P3PPh03-q+FjijJtk2j2=9kKKz9fev=HZA@mail.gmail.com>
Date: Wed, 28 Aug 2024 14:48:08 -0500
From: Robert Nelson <robertcnelson@...il.com>
To: Roger Quadros <rogerq@...nel.org>, "Aldea, Andrei" <a-aldea@...com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Vignesh Raghavendra <vigneshr@...com>, Nishanth Menon <nm@...com>, Andrew Davis <afd@...com>, Jai Luthra <j-luthra@...com>, 
	Siddharth Vadapalli <s-vadapalli@...com>, Jared McArthur <j-mcarthur@...com>, 
	Jason Kridner <jkridner@...gleboard.org>, Deepak Khatri <lorforlinux@...gleboard.org>, 
	Drew Fustini <drew@...gleboard.org>
Subject: Re: [PATCH v3 2/2] arm64: dts: ti: Add k3-am67a-beagley-ai

On Wed, Aug 28, 2024 at 2:44 PM Roger Quadros <rogerq@...nel.org> wrote:
>
>
>
> On 28/08/2024 17:33, Robert Nelson wrote:
> > On Fri, Aug 23, 2024 at 10:33 AM Robert Nelson <robertcnelson@...il.com> wrote:
> >>
> >>>> +
> >>>> +&cpsw3g {
> >>>> +     pinctrl-names = "default";
> >>>> +     pinctrl-0 = <&rgmii1_pins_default>, <&gbe_pmx_obsclk>;
> >>>
> >>> Why do you need OBSCLK for Ethernet MAC?
> >>> The OBSCLK is connected to the Ethernet PHY via C406 which is not even populated.
> >>> It seems that the PHY is clocked by a crystal oscillator X5 so doesn't really
> >>> need OBSCLK in the stock configuration?
> >>
> >> Ah crap, I'll take a look at this... I bet it's left over from the
> >> first pcb, (all my first rev pcb's are now locked up so i don't use
> >> them anymore)..  Seeed/BeagleBoard was playing it safe and designing
> >> in both options.. Once the internal clocks were verified newer
> >> revisions removed the external clock.
> >>
> >> Yeah, I'm pretty sure final production boards removed every external
> >> clock option.
> >
> > Yeap, external clock is the default for all production boards, i
> > removed this internal clock configuration.
>
> Did you mean internal clock is the default?
> Earlier you mentioned
> "after verification newer versions removed the external clock"

Yeah sorry Roger, screwed up on my previous message... I thought one
of our goals was to have an internal clock for everything. But @Aldea,
Andrei reminded me Monday night, that Ethernet was external..

Regards,

-- 
Robert Nelson
https://rcn-ee.com/