linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: sa8775p-ride-r3: add new board file

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Message-ID: <CACMJSes7XcXPZt8NgZm9mQ7h2B6A=+mL13gpZEHY6UnTFqXdOA@mail.gmail.com>
Date: Fri, 21 Jun 2024 15:14:13 +0200
From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
To: Andrew Halaney <ahalaney@...hat.com>
Cc: Bartosz Golaszewski <brgl@...ev.pl>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: qcom: sa8775p-ride-r3: add new board file

On Thu, 20 Jun 2024 at 18:04, Andrew Halaney <ahalaney@...hat.com> wrote:
>
> > +
> > +&mdio {
> > +     compatible = "snps,dwmac-mdio";
> > +     #address-cells = <1>;
> > +     #size-cells = <0>;
> > +
> > +     sgmii_phy0: phy@8 {
> > +             compatible = "ethernet-phy-id31c3.1c33";
> > +             reg = <0x8>;
> > +             device_type = "ethernet-phy";
> > +             interrupts-extended = <&tlmm 7 IRQ_TYPE_EDGE_FALLING>;
> > +             reset-gpios = <&pmm8654au_2_gpios 8 GPIO_ACTIVE_LOW>;
> > +             reset-assert-us = <11000>;
> > +             reset-deassert-us = <70000>;
>
> I need to read your other series still wrt "ocsgmii", but any chance you
> have access to docs indicating the reset timing? I've never had docs for
> the specific Marvell phy on the prior board or the Aquantia one on the
> new board...
>

I have but they're not public. :(

> Boot time is something automotive is always concerned over, so I just
> want to make sure that this timing isn't any longer than it needs to be.
> Right now it looks the same as the Marvell phy's in the "v2" boards etc
> and that made me raise my eyebrows.
>

That's a good point but what else can we do? This should typically
execute in its own thread anyway.

Bart