linux-kernel - Re: [PATCH v4 4/4] usb: simplify hdrc configuration

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Message-ID: <CAMP44s2-ozKUrXsnjzQ7cNFiWSXeSUCfpVPPBJ9FxYGeh8WNOA@mail.gmail.com>
Date:	Tue, 20 Dec 2011 22:25:13 +0200
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	balbi@...com
Cc:	linux-kernel@...r.kernel.org,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Vladimir Zapolskiy <vz@...ia.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Pavankumar Kondeti <pkondeti@...eaurora.org>,
	Benoit Goby <benoit@...roid.com>,
	Li Yang <leoli@...escale.com>,
	"open list:MUSB MULTIPOINT H..." <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v4 4/4] usb: simplify hdrc configuration

On Tue, Dec 20, 2011 at 1:04 PM, Felipe Balbi <balbi@...com> wrote:
> On Tue, Dec 20, 2011 at 03:15:17AM +0200, Felipe Contreras wrote:
>> HDRC requires either NOP_USB_XCEIV or TWLX030_USB, and it selects the
>
> that's not entirely true. Like any USB Link controller, MUSB needs a PHY
> to work, but can be any off-the-shelf PHY. Nokia has used isp1704 and
> isp1707 for instance. I guess Nokia also used tusb1211 and none of them
> are listed there.

Then have a CONFIG_MUSB_PHY menu, or whatever.

> I would rather remove all the dependencies because the person compiling
> the kernel should know that a Link needs a PHY.

Are you serious? Most likely the person compiling the kernel doesn't
even know what PHY really means, and just wants the USB to f*cking
work.

> Maybe add a note
> somewhere stating that you should enable the PHY driver for your
> platform ?

You can say the same of pretty much all the dependencies in the
kernel: oh, just add a note saying that this depends on that. And how
would they know what a PHY driver is?

You already know the dependency, it only needs to be written down:
depends on CONFIG_MUSB_PHY. And then you have a menu for
CONFIG_MUSB_PHY and select the correct transceiver.

Right now it's pretty much impossible for a normal person to figure
out a working configuration on his/her own without just enabling
everything.

-- 
Felipe Contreras
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