linux-kernel - Re: [PATCH v6 2/3] usb: phy: Add Qualcomm SS-USB and HS-USB drivers for DW PHY's

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Date:	Tue, 22 Oct 2013 15:32:43 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
Cc:	Stanimir Varbanov <svarbanov@...sol.com>,
	"balbi@...com" <balbi@...com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Pawel Moll <Pawel.Moll@....com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"idos@...eaurora.org" <idos@...eaurora.org>,
	"mgautam@...eaurora.org" <mgautam@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v6 2/3] usb: phy: Add Qualcomm SS-USB and HS-USB drivers
 for DW PHY's

[...]

> > > +   phy->sleep_a_clk = devm_clk_get(phy->dev, "sleep_a");
> >
> > What means the "_a" in clock name?
> 
> They are 2 PHY's on 8074 chip. This drivers is supposed to
> operate on PHY 0, thus sleep_a. PHY 1 is using sleep_b. Take a look
> here http://www.spinics.net/lists/arm-kernel/msg276945.html

When you say two PHYs, do you mean the HS PHY and the SS PHY?

Or are there two HS PHYs? If so, would the other HS PHY have a sleep_b clock?

The clock-names property should describe the clocks from the view of the device
itself. As we're describing the PHY in isolation, rather than a big block that
contains the PHY, the presesnce or absence of other PHYs should not affect the
name. If the "_a" suffix is only to differentiate the instance of PHY, it
should be dropped.

Thanks,
Mark.
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