[U-Boot] [PATCH v2] spi: cf_qspi: fix clamp macro type check compilation warnings

[Angelo Dureghello <angelo@sysam.it>]

Hi Jagan,

On 29/06/2015 22:00, Jagan Teki wrote:
> On 22 June 2015 at 12:49, Angelo Dureghello <angelo@sysam.it> wrote:
>>
>>
>> On 22/06/2015 08:44, Jagan Teki wrote:
>>>
>>> On 22 June 2015 at 03:10, Angelo Dureghello <angelo@sysam.it> wrote:
>>>>
>>>> Fix compilation warnings for redefined 'clamp' macro and non-uniform
>>>> clamp macro types.
>>>>
>>>> Signed-off-by: Angelo Dureghello <angelo@sysam.it>
>>>> ---
>>>>    drivers/spi/cf_qspi.c | 3 +--
>>>>    1 file changed, 1 insertion(+), 2 deletions(-)
>>>>
>>>> diff --git a/drivers/spi/cf_qspi.c b/drivers/spi/cf_qspi.c
>>>> index 834c5bd..e57e63e 100644
>>>> --- a/drivers/spi/cf_qspi.c
>>>> +++ b/drivers/spi/cf_qspi.c
>>>> @@ -19,7 +19,6 @@
>>>>
>>>>    DECLARE_GLOBAL_DATA_PTR;
>>>>
>>>> -#define clamp(x, low, high) (min(max(low, x), high))
>>>>    #define to_cf_qspi_slave(s) container_of(s, struct cf_qspi_slave,
>>>> slave)
>>>>
>>>>    struct cf_qspi_slave {
>>>> @@ -120,7 +119,7 @@ struct spi_slave *spi_setup_slave(unsigned int bus,
>>>> unsigned int cs,
>>>>                   dev->qmr = 2u;
>>>>           else /* Get the closest baud rate */
>>>>                   dev->qmr = clamp(((gd->bus_clk >> 2) + max_hz -
>>>> 1)/max_hz,
>>>> -                                       2u, 255u);
>>>> +                                       2lu, 255lu);
>
> replacing u with lu - any reason?

Compiling this file you will get compilation warnings.
The reason is that the "unnecessary type check" throws the warnings 
since clamp (and so included min max) uses different types.

u is unsigned int
lu uniforms types to  gd->bus_clk, that is unsigned long.


Best regards
Angelo Dureghello

>
>>>
>>>
>>> Any Tested-by ?
>>>
>>
>> Hi Jagan,
>>
>> i am supposing there are no issues here, since 2 and 255 are inside the
>> 8-bit range, and they was unsigned int instead of unsigned long so the
>> change gives no effect to the clamp.
>>
>> I am still waiting the hardware here for proper mcf / qspi-testing. Will
>> test it then.
>
> thanks!
>