linux-kernel - Re: [PATCH RFC 2/2] arm: dts: marvell: armada-38x: add description for usb phys

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Message-ID: <e35e0edf-f99e-4af7-8abc-c8f96b73ddd5@lunn.ch>
Date: Mon, 15 Jul 2024 20:12:32 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Josua Mayer <josua@...id-run.com>
Cc: Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Gregory Clement <gregory.clement@...tlin.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Yazan Shhady <yazan.shhady@...id-run.com>,
	linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH RFC 2/2] arm: dts: marvell: armada-38x: add description
 for usb phys

On Mon, Jul 15, 2024 at 07:47:30PM +0200, Josua Mayer wrote:
> Armada 38x has 3x USB-2.0 utmi phys. They are almost identical to the 2x
> utmi phys on armada 8k.
> 
> Add descriptions for all 3 phy ports.
> 
> Also add a syscon node covering just the usb configuration registers.
> Armada 8K have a syscon node covering configuration registers for
> various functions including pinmux, woith dirvers using syscon framework

woith -> with

> for register access.
> 
> Armada 388 has various drivers directly claiming some of those
> configuration registers. Hence a similar syscon node would compete for
> resources with these drivers.

Do these drivers make exclusive use of these registers? Or are
multiple drivers using the same registers and you need something to
mediate in order to have atomic access?

In the old days, a register space could be mapped into multiple
drivers, so long as all the drivers agreed to it. There are probably
orion5x, kirkwood era mvebu drivers doing this.
 
	Andrew