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Merge tag 'spi-cs-word' into spi-4.20

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spi: Provide SPI_CS_WORD

This provides a SPI operation mode which changes chip select after every
word, used by some devices such as ADCs and DACs.
This commit is contained in:
Mark Brown
2018-09-17 14:17:30 -07:00
parent 3356d9f4cb cbaa62e009
commit 9263696677
2 changed files with 31 additions and 2 deletions
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2
include/linux/spi/spi.h
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@@ -163,6 +163,7 @@ struct spi_device {
#define SPI_TX_QUAD 0x200 /* transmit with 4 wires */
#define SPI_RX_DUAL 0x400 /* receive with 2 wires */
#define SPI_RX_QUAD 0x800 /* receive with 4 wires */
#define SPI_CS_WORD 0x1000 /* toggle cs after each word */
int irq;
void *controller_state;
void *controller_data;
@@ -177,7 +178,6 @@ struct spi_device {
* the controller talks to each chip, like:
* - memory packing (12 bit samples into low bits, others zeroed)
* - priority
* - drop chipselect after each word
* - chipselect delays
* - ...
*/