Import the flags supported by the Linux spi controller implementation to
make it easier to port driver from Linux.
Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
---
include/spi/spi.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/include/spi/spi.h b/include/spi/spi.h
index 2b441e934d12..8354b7d8baa6 100644
--- a/include/spi/spi.h
+++ b/include/spi/spi.h
@@ -173,6 +173,7 @@ static inline void spi_set_ctldata(struct spi_device *spi, void *state)
* unsupported bits_per_word. If not set, this value is simply ignored,
* and it's up to the individual driver to perform any validation.
* @max_speed_hz: Highest supported transfer speed
+ * @flags: other constraints relevant to this driver
* @setup: updates the device mode and clocking records used by a
* device's SPI controller; protocol code may call this. This
* must fail if an unrecognized or unsupported mode is requested.
@@ -232,6 +233,16 @@ struct spi_controller {
/* limits on transfer speed */
u32 max_speed_hz;
+ /* Other constraints relevant to this driver */
+ u16 flags;
+#define SPI_CONTROLLER_HALF_DUPLEX BIT(0) /* Can't do full duplex */
+#define SPI_CONTROLLER_NO_RX BIT(1) /* Can't do buffer read */
+#define SPI_CONTROLLER_NO_TX BIT(2) /* Can't do buffer write */
+#define SPI_CONTROLLER_MUST_RX BIT(3) /* Requires rx */
+#define SPI_CONTROLLER_MUST_TX BIT(4) /* Requires tx */
+#define SPI_CONTROLLER_GPIO_SS BIT(5) /* GPIO CS must select slave */
+#define SPI_CONTROLLER_SUSPENDED BIT(6) /* Currently suspended */
+
/* setup mode and clock, etc (spi driver may call many times) */
int (*setup)(struct spi_device *spi);
--
2.39.5
