linux-kernel - Re: [RFC] usb issue on imx27: 3 clocks are needed

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Message-ID: <20140818090056.GA29393@peterchendt>
Date:	Mon, 18 Aug 2014 17:00:59 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	Philippe Reynes <tremyfr@...il.com>
CC:	<Linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, <shawn.guo@...escale.com>,
	<gwenhael.goavec-merou@...bucayre.com>
Subject: Re: [RFC] usb issue on imx27: 3 clocks are needed

On Sat, Aug 16, 2014 at 05:38:30PM +0200, Philippe Reynes wrote:
> Hi all,
> 
> i.MX27's usb needs three clocks (usb_ipg_gate, usb_ahb_gate and usb_div)
> but the current chipidea driver implementation, and devicetree, provides
> only ipg and ahb. Consequently, if the bootloader don't enable the last
> one, the kernel will crash.
> 
> Our approach/idea is to add a second, optionnal, clock in ci_hdrc_imx.c
> with 'per' name in devicetree  and to add  clock name 'main_clk' for mandatory clock.
> This approach it correct? Or an other approach seems better?
> Thank you very much for your point of view.
> 

It is ok for me to have ipg, ahb and per clocks at driver, but how can you maintain
DT consistent? Can you accept open ipg and per always on at clock.c?

-- 
Best Regards,
Peter Chen
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