linux-kernel - Re: [RFC PATCHv2 1/4] drivers/otp: add initial support for OTP memory

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Message-ID: <AANLkTik7qzFC_WQPrJAMbV0b6-+CTNfP6CcQnK6BKiWn@mail.gmail.com>
Date:	Sat, 26 Mar 2011 13:55:39 -0400
From:	Mike Frysinger <vapier@...too.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Jamie Iles <jamie@...ieiles.com>, linux-kernel@...r.kernel.org,
	gregkh@...e.de
Subject: Re: [RFC PATCHv2 1/4] drivers/otp: add initial support for OTP memory

On Sat, Mar 26, 2011 at 06:54, Arnd Bergmann wrote:
> On Saturday 26 March 2011 03:16:48 Mike Frysinger wrote:
>> On Fri, Mar 25, 2011 at 20:21, Jamie Iles wrote:
>> > For the actual ioctl() we should assume byte addressing rather than
>> > words though and do the conversion in the driver so we can cope with
>> > devices that don't have 64-bit words and do the locking on a looping
>> > word-by-word basis.
>> >
>> >        struct otp_lock_req {
>> >                __u32   start_addr;
>> >                __u32   byte_count;
>> >        };
>
> Looks good to me.
>
>> i would add an ABI field here too so if in the future we want to add
>> stuff, we can do so without adding new ioctls.  like "u16 version; u16
>> flags;".  then in the ioctl, if version isnt 0, we return ENOTSUP.  in
>> the future, we can add flags or bump the version.
>
> No, versioned APIs are just a pain to maintain, it's easier to add
> new ioctl commands when necessary.
> Note that the kernel would always have to support all versions of
> the API anyway.

adding at least a flags field then should be fine
-mike
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