linux-kernel - Re: [PATCH] arm: omap4: pandaboard: turn on PHY reference clock at init

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Message-ID: <alpine.DEB.2.00.1101101152040.5731@utopia.booyaka.com>
Date:	Mon, 10 Jan 2011 11:52:24 -0700 (MST)
From:	Paul Walmsley <paul@...an.com>
To:	Anand Gadiyar <gadiyar@...com>
cc:	linux-omap@...r.kernel.org, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, Greg KH <gregkh@...e.de>,
	Felipe Balbi <balbi@...com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Benoit Cousson <b-cousson@...com>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH] arm: omap4: pandaboard: turn on PHY reference clock at
 init

On Mon, 10 Jan 2011, Anand Gadiyar wrote:

> The SMSC 3320 USB PHY on the OMAP4 Pandaboard needs a 19.2 MHz
> reference clock. This clock is provided from the OMAP4's fref_clk3
> pad.
> 
> Recent changes to clock44xx_data.c made the clock framework aware
> of the existence of these fref_clk[i] lines. If the option
> CONFIG_OMAP_RESET_CLOCKS is enabled in the kernel, then the
> clock framework will turn these clocks off during bootup.
> 
> Explicitly request and keep this clock enabled at init for the
> Pandaboard, so that the PHY receives this clock at all times.
> 
> Reported-by: Ming Lei <tom.leiming@...il.com>
> Signed-off-by: Anand Gadiyar <gadiyar@...com>
> Cc: Benoit Cousson <b-cousson@...com>
> Cc: Paul Walmsley <paul@...an.com>
> Cc: Tony Lindgren <tony@...mide.com>

Reviewed-by: Paul Walmsley <paul@...an.com>


- Paul
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