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authorSowjanya Komatineni <skomatineni@nvidia.com>2020-12-22 00:17:35 +0300
committerMark Brown <broonie@kernel.org>2021-01-06 16:09:31 +0300
commit98621ed011c57ba6e52e01a5982b221c9943b6d9 (patch)
tree505e60214ccdf5bd51918cf52730416bee2de05f /include/linux/spi
parent921fc1838fb036f690b8ba52e6a6d3644b475cbb (diff)
downloadlinux-98621ed011c57ba6e52e01a5982b221c9943b6d9.tar.xz
spi: spi-mem: Mark dummy transfers by setting dummy_data bit
This patch marks dummy transfer by setting dummy_data bit to 1. Controllers supporting dummy transfer by hardware use this bit field to skip software transfer of dummy bytes and use hardware dummy bytes transfer. Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com> Link: https://lore.kernel.org/r/1608585459-17250-6-git-send-email-skomatineni@nvidia.com Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/linux/spi')
-rw-r--r--include/linux/spi/spi.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 9bfdfaf286eb..797ef28fa7d5 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -825,6 +825,7 @@ extern void spi_res_release(struct spi_controller *ctlr,
* transfer. If 0 the default (from @spi_device) is used.
* @bits_per_word: select a bits_per_word other than the device default
* for this transfer. If 0 the default (from @spi_device) is used.
+ * @dummy_data: indicates transfer is dummy bytes transfer.
* @cs_change: affects chipselect after this transfer completes
* @cs_change_delay: delay between cs deassert and assert when
* @cs_change is set and @spi_transfer is not the last in @spi_message
@@ -937,6 +938,7 @@ struct spi_transfer {
struct sg_table tx_sg;
struct sg_table rx_sg;
+ unsigned dummy_data:1;
unsigned cs_change:1;
unsigned tx_nbits:3;
unsigned rx_nbits:3;