linux-kernel - Re: [PATCH v12 1/4] PHY: Add function set

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Message-ID: <CAPw-ZT=F07=T0=z=iT=hxJ0+609RBDYRL=MXF5dQoEowLjsRjQ@mail.gmail.com>
Date:	Thu, 27 Feb 2014 11:57:44 -0800
From:	Loc Ho <lho@....com>
To:	balbi@...com
Cc:	Kishon Vijay Abraham I <kishon@...com>, Tejun Heo <tj@...nel.org>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org,
	Linux SCSI List <linux-scsi@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Don Dutile <ddutile@...hat.com>, Jon Masters <jcm@...hat.com>,
	"patches@....com" <patches@....com>
Subject: Re: [PATCH v12 1/4] PHY: Add function set_speed to generic PHY framework

Hi Balbi,

> On Thu, Feb 27, 2014 at 11:14:05AM -0700, Loc Ho wrote:
>> This patch adds function set_speed to the generic PHY framework operation
>> structure. This function can be called to instruct the PHY underlying layer
>> at specified lane to configure for specified speed in hertz.
>
> why ? looks like clk_set_rate() is your friend here. Can you be more
> descriptive of the use case ? When will this be used ?
>

The phy_set_speed is used to configure the operation speed of the PHY
at run-time. The clock interface in general is used to configure the
clock input to the IP. I don't believe they are the same thing. Maybe
it will be clear in my response to your second email

-Loc
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