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spi: spi-omap2-mcspi: Handle DMA size restriction on AM65x

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On AM654, McSPI can only support 4K - 1 bytes per transfer when DMA is
enabled. Therefore populate master->max_transfer_size callback to
inform client drivers of this restriction when DMA channels are
available.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20200204124816.16735-2-vigneshr@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Vignesh Raghavendra 2020-02-04 18:18:15 +05:30 • committed by Mark Brown
parent a5362b84bd
commit e4e8276a4f
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2 changed files with 27 additions and 0 deletions
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1
include/linux/platform_data/spi-omap2-mcspi.h
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@ -11,6 +11,7 @@ struct omap2_mcspi_platform_config {
unsigned short num_cs;
unsigned int regs_offset;
unsigned int pin_dir:1;
size_t max_xfer_len;
};
struct omap2_mcspi_device_config {