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

[Tobias Klauser <tklauser@distanz.ch>]

On 2011-02-18 at 09:08:53 +0100, Grant Likely <grant.likely@secretlab.ca> wrote:
> On Thu, Feb 17, 2011 at 6:28 PM, Thomas Chou <thomas@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.

Thanks Grant and Thomas for the explanation. I was just wondering. I'll
send an updated patch including the changes suggested by Thomas.

Tobias