linux-kernel - Re: [PATCH 3/5] drivers:usb:fsl: Replace macros with enumerated type

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Date:	Sun, 31 May 2015 00:11:18 -0700
From:	Joe Perches <joe@...ches.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Nikhil Badola <nikhil.badola@...escale.com>,
	linux-kernel@...r.kernel.org, stern@...land.harvard.edu,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH 3/5] drivers:usb:fsl: Replace macros with enumerated type

On Sun, 2015-05-31 at 15:50 +0900, Greg KH wrote:
> On Tue, May 26, 2015 at 05:15:48PM +0530, Nikhil Badola wrote:
> > Replace macros with enumerated type to represent usb ip
> > controller version
> > 
> > Signed-off-by: Nikhil Badola <nikhil.badola@...escale.com>
> > ---
> >  include/linux/fsl_devices.h | 13 ++++++++-----
> >  1 file changed, 8 insertions(+), 5 deletions(-)
> > 
> > diff --git a/include/linux/fsl_devices.h b/include/linux/fsl_devices.h
[]
> > +enum fsl_usb2_controller_ver {
> > +	FSL_USB_VER_OLD = 0,
> > +	FSL_USB_VER_1_6,
> > +	FSL_USB_VER_2_2,
> > +	FSL_USB_VER_2_4,
> > +	FSL_USB_VER_2_5,
> > +};
> 
> Don't you want to change that function that uses these to return the
> enumerated type and not an integer?
> 
> Also, I don't think the C standard forces the non-numberd values to be
> sequential,

Then you haven't read the standard in awhile and you likely forgot.

6.7.2.2
If the first enumerator has no =, the value of its enumeration constant
is 0. Each subsequent enumerator with no = defines its enumeration
constant as the value of the constant expression obtained by adding 1 to
the value of the previous enumeration constant.



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