[U-Boot] [PATCH 02/20] dm: i2c: sandbox: Add debugging to the speed limit

[Simon Glass]

Hi Heiko,

On 20 April 2015 at 23:04, Heiko Schocher <hs at denx.de> wrote:
> Hello Simon,
>
>
> Am 20.04.2015 20:37, schrieb Simon Glass:
>>
>> Print a debug() message with the I2C speed is exceeded.
>>
>> Signed-off-by: Simon Glass <sjg at chromium.org>
>> ---
>>
>>   drivers/i2c/sandbox_i2c.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/i2c/sandbox_i2c.c b/drivers/i2c/sandbox_i2c.c
>> index d6adc0f..621caec 100644
>> --- a/drivers/i2c/sandbox_i2c.c
>> +++ b/drivers/i2c/sandbox_i2c.c
>> @@ -73,8 +73,10 @@ static int sandbox_i2c_xfer(struct udevice *bus, struct
>> i2c_msg *msg,
>>          * 400KHz for reads
>>          */
>>         is_read = nmsgs > 1;
>> -       if (i2c->speed_hz > (is_read ? 400000 : 100000))
>> +       if (i2c->speed_hz > (is_read ? 400000 : 100000)) {
>> +               debug("%s: Max speed exceeded\n", __func__);
>>                 return -EINVAL;
>> +       }
>
>
> Why different speeds for reading/writing?

This is just test code - in fact a later patch adds a flag to enable
it only when running tests. See test/dm/i2c.c.

Regards,
Simon