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

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Message-ID: <20211008180427.68be1d3f@thinkpad>
Date:   Fri, 8 Oct 2021 18:04:27 +0200
From:   Marek Behún <kabel@...nel.org>
To:     Robert Marko <robert.marko@...tura.hr>
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, 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.