linux-kernel - Re: [Nios2-dev] [PATHV v2] tty: serial: altera

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Date:	Fri, 18 Feb 2011 01:08:53 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Thomas Chou <thomas@...ron.com.tw>
Cc:	Tobias Klauser <tklauser@...tanz.ch>,
	nios2-dev@...c.et.ntust.edu.tw,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-serial@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Nios2-dev] [PATHV v2] tty: serial: altera_uart: Add devicetree support

On Thu, Feb 17, 2011 at 6:28 PM, Thomas Chou <thomas@...ron.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.
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