[PATCH] clk: fix clk_get_rate() documentation

[Giulio Benetti]

Hi Simon, Sean,

> Il giorno 13 feb 2021, alle ore 05:17, Simon Glass <sjg at chromium.org> ha scritto:
> 
> On Fri, 12 Feb 2021 at 18:17, Giulio Benetti
> <giulio.benetti at 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 at benettiengineering.com>
>>>> ---
>>>>   include/clk.h | 2 +-
>>>>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Reviewed-by: Simon Glass <sjg at 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.

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

Best regards
Giulio Benetti