linux-kernel - Re: [PATCH v7] usb:serial:pl2303: add GPIOs interface on PL2303

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Message-ID: <20140827234301.GB418@localhost.localdomain>
Date:	Thu, 28 Aug 2014 07:43:01 +0800
From:	Wang YanQing <udknight@...il.com>
To:	Johan Hovold <johan@...nel.org>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	gregkh@...uxfoundation.org, jhovold@...il.com, andi@...as.de,
	dforsi@...il.com, gnomes@...rguk.ukuu.org.uk,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7] usb:serial:pl2303: add GPIOs interface on PL2303

On Mon, Aug 18, 2014 at 12:07:20PM +0200, Johan Hovold wrote:
> On Sun, Aug 17, 2014 at 10:05:36AM +0800, Wang YanQing wrote:
> > Hi Johan Hovold.
> > 
> > Another two questions.
> > 	
> > On Tue, Aug 12, 2014 at 04:46:25PM +0200, Johan Hovold wrote:
> > > 
> > > > +	int (*gpio_startup)(struct usb_serial *serial);
> > > > +	void (*gpio_release)(struct usb_serial *serial);
> > > 
> > > This isn't the right place for this abstraction. Most of the setup code
> > > would be common for any device type with GPIOs.
> > 
> > I assume you mean any pl2303 variant, not any device type, because
> > no device in drivers/gpio has common setup code except many of them
> > use struct gpio_chip.
> 
> Yes, pl2303 type/variant. Specifically, much of the setup code will be
> identical even if say the number of gpio differ (2 or 4) depending on
> type.

Yes, indeed unless I know how to make kernel could distinguish those two
types, this patch willn't be fit for mergence.

And I don't have free time recent, I need more time to prepare this patch, or could you
figure out how to distinguish them?

Thanks.
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