Re: [PATCH v2 2/2] spi: omap2-mcspi: Add FIFO buffer support

From: Mark Brown
Date: Wed Jun 12 2013 - 11:48:35 EST

On Tue, Jun 11, 2013 at 08:09:15PM +0300, Illia Smyrnov wrote:
> The MCSPI controller has a built-in FIFO buffer to unload the DMA or interrupt
> handler and improve data throughput. This patch adds FIFO buffer support for SPI
> transfers in DMA mode.

> The FIFO could be enabled for SPI module by setting up the "ti,spi-fifo-enabled"
> configuration parameter in DT.
> If FIFO enabled, the largest possible FIFO buffer size will be calculated and
> setup for each SPI transfer. Even if the FIFO is enabled in DT, it won't be used
> for the SPI transfers when: calculated FIFO buffer size is less then 2 bytes or
> the FIFO buffer size isn't multiple of the SPI word length.

Why is the default to disable the FIFO?

Attachment: signature.asc
Description: Digital signature