linux-kernel - Re: [PATCH v6 1/4] mfd: add support for Diolan DLN-2 devices

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Date:	Mon, 6 Oct 2014 15:17:22 +0300
From:	Octavian Purdila <octavian.purdila@...el.com>
To:	Johan Hovold <johan@...nel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Daniel Baluta <daniel.baluta@...el.com>,
	Laurentiu Palcu <laurentiu.palcu@...el.com>,
	linux-usb@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH v6 1/4] mfd: add support for Diolan DLN-2 devices

On Fri, Oct 3, 2014 at 8:12 PM, Johan Hovold <johan@...nel.org> wrote:
>
> On Thu, Sep 25, 2014 at 07:07:31PM +0300, Octavian Purdila wrote:
> > This patch implements the USB part of the Diolan USB-I2C/SPI/GPIO
> > Master Adapter DLN-2. Details about the device can be found here:
> >

<snip>

> > +
> > +             ret = dln2_submit_urb(dln2, dln2->rx_urb[i], GFP_KERNEL);
> > +             if (ret < 0)
> > +                     return ret;
>
> Is it really worth having this helper only to save a couple of lines on
> a dev_err? If you do all resubmissions on completion inline in the
> handler, you only have three places where usb_submit_urb is called.
>

I moved the completion in the handler as you suggested. I have kept
the helper, would you prefer to remove it?

<snip>

> > +     id = dln2->usb_dev->bus->busnum << 8 | dln2->usb_dev->devnum;
>
> After giving this some more thought, I think you should just
> use PLATFORM_DEVID_AUTO as id. I have submitted a series to fix the
> other USB MFD drivers and add a convenience helper to register
> hotpluggable MFDs here:
>

OK, I will use PLATFORM_DEVID_AUTO for now. If your series merges
first and I have to resubmit mine, I will switch to using
mfd_add_hotplug_devices.

> I'll try to take a quick look on the subdrivers on Monday.
>

Thanks Johan. I have addressed the rest of the comments as well and I
will send another series after your reviews on the sub-drivers.
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