linux-kernel - Re: [PATCH] phy: Add exynos-phy driver

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Date:	Wed, 11 Dec 2013 11:16:39 +0100
From:	Sylwester Nawrocki <s.nawrocki@...sung.com>
To:	Kishon Vijay Abraham I <kishon@...com>,
	Tomasz Stanislawski <t.stanislaws@...sung.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org
Cc:	t.figa@...sung.com, kgene.kim@...sung.com, grant.likely@...aro.org,
	rob.herring@...xeda.com, sylvester.nawrocki@...il.com,
	kyungmin.park@...sung.com
Subject: Re: [PATCH] phy: Add exynos-phy driver

On 11/12/13 10:54, Kishon Vijay Abraham I wrote:
> On Wednesday 27 November 2013 06:56 PM, Tomasz Stanislawski wrote:
>> > Hello everyone,
>> > The Samsung SoCs from Exynos family are enhanced with a bunch of switches
>> > dedicated for IP blocks. Those switches are called PHYs in Exynos
>> > specification. They are usually controlled by a single bit in a single
>> > one-word-long register.
>
> So only enabling this switch is enough for the controller or some other actual
> PHY IP is needed along with this switch?
> 
> However I'm not sure if the switch should be modelled as PHY as it is not a PHY
> in the real sense.

These are ordinary PHY devices embedded in an SoC. I wouldn't really call
them "switches", as they indeed provide the physical layer functionality 
for various interfaces, like USB, HDMI, MIPI CSI/DSI, etc. Their control 
interface is often very simple - usually only an enable and a reset 
control bit. But that can't change the fact they are real PHY devices,
so let's not call them switches, that's just untrue.

Regards,
Sylwester
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