summaryrefslogtreecommitdiffstats
path: root/include/uapi/linux/spi/spi.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/uapi/linux/spi/spi.h')
-rw-r--r--include/uapi/linux/spi/spi.h43
1 files changed, 43 insertions, 0 deletions
diff --git a/include/uapi/linux/spi/spi.h b/include/uapi/linux/spi/spi.h
new file mode 100644
index 0000000000..ca56e477d1
--- /dev/null
+++ b/include/uapi/linux/spi/spi.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
+#ifndef _UAPI_SPI_H
+#define _UAPI_SPI_H
+
+#include <linux/const.h>
+
+#define SPI_CPHA _BITUL(0) /* clock phase */
+#define SPI_CPOL _BITUL(1) /* clock polarity */
+
+#define SPI_MODE_0 (0|0) /* (original MicroWire) */
+#define SPI_MODE_1 (0|SPI_CPHA)
+#define SPI_MODE_2 (SPI_CPOL|0)
+#define SPI_MODE_3 (SPI_CPOL|SPI_CPHA)
+#define SPI_MODE_X_MASK (SPI_CPOL|SPI_CPHA)
+
+#define SPI_CS_HIGH _BITUL(2) /* chipselect active high? */
+#define SPI_LSB_FIRST _BITUL(3) /* per-word bits-on-wire */
+#define SPI_3WIRE _BITUL(4) /* SI/SO signals shared */
+#define SPI_LOOP _BITUL(5) /* loopback mode */
+#define SPI_NO_CS _BITUL(6) /* 1 dev/bus, no chipselect */
+#define SPI_READY _BITUL(7) /* slave pulls low to pause */
+#define SPI_TX_DUAL _BITUL(8) /* transmit with 2 wires */
+#define SPI_TX_QUAD _BITUL(9) /* transmit with 4 wires */
+#define SPI_RX_DUAL _BITUL(10) /* receive with 2 wires */
+#define SPI_RX_QUAD _BITUL(11) /* receive with 4 wires */
+#define SPI_CS_WORD _BITUL(12) /* toggle cs after each word */
+#define SPI_TX_OCTAL _BITUL(13) /* transmit with 8 wires */
+#define SPI_RX_OCTAL _BITUL(14) /* receive with 8 wires */
+#define SPI_3WIRE_HIZ _BITUL(15) /* high impedance turnaround */
+#define SPI_RX_CPHA_FLIP _BITUL(16) /* flip CPHA on Rx only xfer */
+#define SPI_MOSI_IDLE_LOW _BITUL(17) /* leave mosi line low when idle */
+
+/*
+ * All the bits defined above should be covered by SPI_MODE_USER_MASK.
+ * The SPI_MODE_USER_MASK has the SPI_MODE_KERNEL_MASK counterpart in
+ * 'include/linux/spi/spi.h'. The bits defined here are from bit 0 upwards
+ * while in SPI_MODE_KERNEL_MASK they are from the other end downwards.
+ * These bits must not overlap. A static assert check should make sure of that.
+ * If adding extra bits, make sure to increase the bit index below as well.
+ */
+#define SPI_MODE_USER_MASK (_BITUL(18) - 1)
+
+#endif /* _UAPI_SPI_H */