Re: [PATCH v2] spi: New driver for Altera SPI

[Grant Likely]

On Sun, Jan 16, 2011 at 11:22 PM, Thomas Chou <thomas@xxxxxxxxxxxxx> wrote:
> On 01/17/2011 01:59 PM, Stephen Rothwell wrote:
>>>
>>> +/*
>>> + * struct altera_spi_platform_data - platform data of the Altera SPI
>>> + * @interrupt: use intrrupt driven data transfer.
>>> + */
>>> +struct altera_spi_platform_data {
>>> +       int interrupt;
>>> +};
>>
>> Is there some reason that this struct definition cannot just be placed
>> in spi_altera.c and so save a whole extra file (and its inclusion)?
>>
>
> Hi Stephen,
>
> It is needed for board configuration file to attach this platform data,
> which is used to choose between interrupt driven data transfer or polling
> method. The data transfer rate is usually faster for polling, as interrupt
> overhead is higher.

In this case, that decision could simply be made based on whether or
not the device has an irq resource.  No irq == polled mode.

g.
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