linux-kernel - Re: [PATCH v5] arm64: dts: marvell: add Globalscale MOCHAbin

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Date:   Fri, 8 Oct 2021 18:05:55 +0200
From:   Robert Marko <robert.marko@...tura.hr>
To:     Marek Behún <kabel@...nel.org>
Cc:     Pali Rohár <pali@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        gregory.clement@...tlin.com, sebastian.hesselbarth@...il.com,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5] arm64: dts: marvell: add Globalscale MOCHAbin

On Fri, Oct 8, 2021 at 6:04 PM Marek Behún <kabel@...nel.org> wrote:
>
> On Fri, 8 Oct 2021 17:52:40 +0200
> Robert Marko <robert.marko@...tura.hr> wrote:
>
> > I have to agree, so I did some digging.
> > I don't think that the Armada 8k PCI driver actually supports HW level PERST#.
> > I then looked at the functional specs and the only thing that looks
> > related to PERST#
> > is PCIe Software Reset Register which has a SoftWarePERst bit.
> >
> > Can you maybe look at it?
> >
> > Removed the reset-gpios and set the PERST pinmux to PCIe, and the
> > QCA9377 card will
> > show up, but I have no idea whether PERST# actually ever gets toggled.
>
> You can check with voltmeter, toggle the bit via mw command in u-boot.

Yeah, I was planning to do that but I cant actually read the register
as using md
or devmem causes it to lock up and then panic and reset.

Regards,
Robert
-- 
Robert Marko
Staff Embedded Linux Engineer
Sartura Ltd.
Lendavska ulica 16a
10000 Zagreb, Croatia
Email: robert.marko@...tura.hr
Web: www.sartura.hr