[Nios2-dev] [PATHV v2] tty: serial: altera_uart: Add devicetree support

[Grant Likely]

On Thu, Feb 17, 2011 at 6:28 PM, Thomas Chou <thomas at wytron.com.tw> wrote:
> On 02/17/2011 03:48 PM, Tobias Klauser wrote:
>>>>
>>>> +       ret = altera_uart_get_of_uartclk(pdev, port);
>>>> +       if (ret&&   platp)
>>>> +               port->uartclk = platp->uartclk;
>>>> +       else if (ret)
>>>> +               return ret;
>>>> +
>>>
>>> Better reverse the priority, with platform data checked first.
>>>
>>>        if (platp)
>>>                port->uartclk = platp->uartclk;
>>>        else {
>>>                ret = altera_uart_get_of_uartclk(pdev, port);
>>>                if (ret)
>>>                        return ret;
>>>        }
>>
>> Do you have a specific reasoning for this? I thought it might make sense
>> to do it in the same order as with the resources above, but I have no
>> problem changing it to the way you suggest.
>
> Not quite sure. But I see some drivers follow this order, and I just
> followed, too.

The reason to check for platform_data first is that if a device has
*both* platform data and a device node pointer, then more than likely
the platform_data is indented to override the device node data.

g.