netdev - Re: [PATCH] [v7] net: emac: emac gigabit ethernet controller driver

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Date:	Fri, 5 Aug 2016 14:36:02 -0500
From:	Timur Tabi <timur@...eaurora.org>
To:	Rob Herring <robh@...nel.org>
Cc:	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, sdharia@...eaurora.org,
	shankerd@...eaurora.org, vikrams@...eaurora.org,
	cov@...eaurora.org, gavidov@...eaurora.org, andrew@...n.ch,
	bjorn.andersson@...aro.org, mlangsdo@...hat.com, jcm@...hat.com,
	agross@...eaurora.org, davem@...emloft.net, f.fainelli@...il.com,
	LinoSanfilippo@....de
Subject: Re: [PATCH] [v7] net: emac: emac gigabit ethernet controller driver

Rob Herring wrote:
> Sounds like 2 different h/w. The compatible property should distinguish
> this.

So I changed it to this:

- compatible : Should be "qcom,fsm9900-emac" or "qcom,qdf2432-emac",
  	depending on the version of the internal PHY.
	"qcom,fsm9900-emac" is for v1, and "qcom,qdf2432-emac"
	is for v2.

(and changed the code to match).

However, now this doesn't work look right any more:

The external phy child node:
- compatible : Should be "qcom,fsm9900-emac-phy".
- reg : The phy address

I was never crazy about this, because the external PHY is whatever 
device it happens to be.

The phy driver uses of_mdiobus_register, which calls 
of_mdiobus_child_is_phy().  Based on my reading of the code, I think I 
should just drop the compatible property altogether.  Because the way it 
is now causes of_mdiobus_child_is_phy() to return false when it parses 
that node.

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm
Technologies, Inc.  Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.