netdev - Re: [net-next PATCH RFC v3 1/8] dt-bindings: net: document ethernet PHY package nodes

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Date: Sun, 7 Jan 2024 19:31:55 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Sergey Ryazanov <ryazanov.s.a@...il.com>
Cc: Christian Marangi <ansuelsmth@...il.com>,
	Robert Marko <robert.marko@...tura.hr>,
	Vladimir Oltean <olteanv@...il.com>,
	Rob Herring <robh+dt@...nel.org>, Luo Jie <quic_luoj@...cinc.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Andy Gross <agross@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [net-next PATCH RFC v3 1/8] dt-bindings: net: document ethernet
 PHY package nodes

> And I would like to ask you about another issue raised by Vladimir [1].
> These phy chips become SoC with all these built-in PHYs, PCSs, clocks,
> interrupt controllers, etc. Should we address this now? Or should we go with
> the proposed solution for now and postpone modeling of other peripherals
> until we get a real hardware, as Andrew suggested?
> 
> I'm asking because it looks like we have got a real hardware. Luo currently
> trying to push QCA8084 (multi-phy/switch chip) support, and this chip
> exactly contains a huge clock/reset controller [2,3].

Ideally the reset controller is modelled as a Linux reset
controller. The clock part of it is modelled using the common clock
framework. When done correctly, the PHY should not really care. All it
does is ask for its clock to be enabled, and its reset to be disabled.

Also, given how difficult it is proving to be to make any progress at
all, i want to get one little part correctly described, the pure
PHY. Once we have that, we can start on the next little part. So long
as we keep to the Linux architecture of blocks or hardware with
standard Linux drivers, and DT to glue them together, a small step by
step approach should work out.

     Andrew