[PATCH] clk: fix clk_get_rate() documentation

[Simon Glass <sjg@chromium.org>]

Hi Giulio,

On Sat, 13 Feb 2021 at 01:47, Giulio Benetti
<giulio.benetti@benettiengineering.com> wrote:
>
> Hi Simon, Sean,
>
> > Il giorno 13 feb 2021, alle ore 05:17, Simon Glass <sjg@chromium.org> ha scritto:
> >
> > ?On Fri, 12 Feb 2021 at 18:17, Giulio Benetti
> > <giulio.benetti@benettiengineering.com> wrote:
> >>
> >>> On 2/13/21 12:25 AM, Sean Anderson wrote:
> >>> On 2/10/21 12:37 PM, Giulio Benetti wrote:
> >>>> clk_get_rate() can't and doesn't return -ve on error, it actually returns 0
> >>>> on error or a value greater than 0 on success. So let's fix its
> >>>> documentation.
> >>>>
> >>>> Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
> >>>> ---
> >>>>   include/clk.h | 2 +-
> >>>>   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > Reviewed-by: Simon Glass <sjg@chromium.org>
>
> Sean has already given me a NAK because this function actually return negative values through a ulong return types.
> I didn?t check into clk-uclass.c and there if get_rate() pointer is not found then it returns a negative value.

Yes, wrong email...see below.

>
> Since it?s a bit ambiguous I?ve tried to find a different approach but nothing that easy came into my mind.

Something like this:

* @return clock rate in Hz, 0 for invalid clock, or -ve error code for
other error

You can use
Regards,
Simon