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    SubjectRe: [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
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