net: sun8i_emac: Add support for the H6 variant

[oweals/u-boot.git] / include / spi.h

diff --git a/include/spi.h b/include/spi.h
index 6fbb4336ce381f9fa9a38e72546983102baf1e79..5cc6d6e0087fa5b00eff5d9489ff4838cf2e0a6a 100644 (file)
--- a/include/spi.h
+++ b/include/spi.h
@@ -10,6 +10,7 @@
 #define _SPI_H_
 
 #include <common.h>
+#include <linux/bitops.h>
 
 /* SPI mode flags */
 #define SPI_CPHA       BIT(0)                  /* clock phase */
@@ -30,6 +31,8 @@
 #define SPI_RX_SLOW    BIT(11)                 /* receive with 1 wire slow */
 #define SPI_RX_DUAL    BIT(12)                 /* receive with 2 wires */
 #define SPI_RX_QUAD    BIT(13)                 /* receive with 4 wires */
+#define SPI_TX_OCTAL   BIT(14)                 /* transmit with 8 wires */
+#define SPI_RX_OCTAL   BIT(15)                 /* receive with 8 wires */
 
 /* Header byte that marks the start of the message */
 #define SPI_PREAMBLE_END_BYTE  0xec
@@ -64,6 +67,39 @@ struct dm_spi_slave_platdata {
 
 #endif /* CONFIG_DM_SPI */
 
+/**
+ * enum spi_clock_phase - indicates  the clock phase to use for SPI (CPHA)
+ *
+ * @SPI_CLOCK_PHASE_FIRST: Data sampled on the first phase
+ * @SPI_CLOCK_PHASE_SECOND: Data sampled on the second phase
+ */
+enum spi_clock_phase {
+       SPI_CLOCK_PHASE_FIRST,
+       SPI_CLOCK_PHASE_SECOND,
+};
+
+/**
+ * enum spi_wire_mode - indicates the number of wires used for SPI
+ *
+ * @SPI_4_WIRE_MODE: Normal bidirectional mode with MOSI and MISO
+ * @SPI_3_WIRE_MODE: Unidirectional version with a single data line SISO
+ */
+enum spi_wire_mode {
+       SPI_4_WIRE_MODE,
+       SPI_3_WIRE_MODE,
+};
+
+/**
+ * enum spi_polarity - indicates the polarity of the SPI bus (CPOL)
+ *
+ * @SPI_POLARITY_LOW: Clock is low in idle state
+ * @SPI_POLARITY_HIGH: Clock is high in idle state
+ */
+enum spi_polarity {
+       SPI_POLARITY_LOW,
+       SPI_POLARITY_HIGH,
+};
+
 /**
  * struct spi_slave - Representation of a SPI slave
  *
@@ -224,7 +260,7 @@ void spi_release_bus(struct spi_slave *slave);
 int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen);
 
 /**
- * SPI transfer
+ * SPI transfer (optional if mem_ops is used)
  *
  * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
  * "bitlen" bits in the SPI MISO port.  That's just the way SPI works.
@@ -561,7 +597,8 @@ int spi_chip_select(struct udevice *slave);
  * @bus:       SPI bus to search
  * @cs:                Chip select to look for
  * @devp:      Returns the slave device if found
- * @return 0 if found, -ENODEV on error
+ * @return 0 if found, -EINVAL if cs is invalid, -ENODEV if no device attached,
+ *        other -ve value on error
  */
 int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp);