linux-kernel - Re: [PATCH v8] usb:serial:pl2303: add GPIOs interface on PL2303

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Message-ID: <20140910015824.GA11233@localhost.localdomain>
Date:	Wed, 10 Sep 2014 09:58:24 +0800
From:	Wang YanQing <udknight@...il.com>
To:	Johan Hovold <johan@...nel.org>
Cc:	Benjamin Henrion <zoobab@...il.com>, gregkh@...uxfoundation.org,
	linus.walleij@...aro.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 v8] usb:serial:pl2303: add GPIOs interface on PL2303

On Tue, Sep 09, 2014 at 04:02:04PM +0200, Johan Hovold wrote:
> On Tue, Sep 09, 2014 at 12:43:56PM +0200, Johan Hovold wrote:
> > On Tue, Sep 09, 2014 at 06:21:31PM +0800, Wang YanQing wrote:
> > > On Tue, Sep 09, 2014 at 12:08:56PM +0200, Johan Hovold wrote:
> > > > On Fri, Sep 05, 2014 at 09:30:11AM +0800, Wang YanQing wrote:
> > > > > On Thu, Sep 04, 2014 at 06:44:31PM +0200, Benjamin Henrion wrote:
> > > > > > On Thu, Sep 4, 2014 at 6:14 PM, Benjamin Henrion <zoobab@...il.com> wrote:
> > > > > > > I have subscribed to the lkml.
> > > > > > >
> > > > > > > Can you make me a favour, send me your email as you posted on the LKML
> > > > > > > in mbox format attached to an email?
> > > > > > >
> > > > > > > I am trying to reply to it, but I cannot find an mbox archive, outside
> > > > > > > of gmane which rewrites all the email addresses.
> > > > > > >
> > > > > > > Otherwise, I made a page here:
> > > > > > >
> > > > > > > http://www.zoobab.com/pl2303hxd-gpio
> > > > > > >
> > > > > > > I will also try with other adapters to see if the 2 GPIOs show up.
> > > > > > >
> > > > > > > Any idea how to test the GPIO sysfs speed?
> > > > > > 
> > > > > > Also tested with an HXA laying around, I could export the 2 GPIOS in
> > > > > > /sys/class/gpio, but I could not change the status of the pins via
> > > > > > echo.
> > > > > > 
> > > > > > Any idea why?
> > > > > 
> > > > > It is strange, I have tested again with my two HXA adapters, they work well.
> > > > > How do you test? check cat value or check voltage change? I check cat value,
> > > > > and they work good.
> > > > 
> > > > So you haven't verified that the voltage actually changes?
> > > > 
> > > > Johan
> > > 
> > > I have verified the voltage actually changes in previous patch version,
> > > but I haven't verified that with v8.
> > 
> > Ok, good. I'll get back to you with some comments on v8 shortly.
> 
> Wait a minute. You restructured the driver, added support for two new
> gpios as well as another device type, so you need to verify the voltage
> on the pins (on both device types) as well.

Benjamin Henrion had verified voltage on pins of HXD, see

http://www.zoobab.com/pl2303hxd-gpio

Sorry I don't have pinout version of PL2303 RA, so I can't verified voltage on it,
I only can test it by echo & cat.

Thanks.
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