#define _SPI_H_
#include <common.h>
+#include <linux/bitops.h>
/* SPI mode flags */
#define SPI_CPHA BIT(0) /* clock phase */
#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
#define SPI_DEFAULT_WORDLEN 8
-#ifdef CONFIG_DM_SPI
+#if CONFIG_IS_ENABLED(DM_SPI)
/* TODO(sjg@chromium.org): Remove this and use max_hz from struct spi_slave */
struct dm_spi_bus {
uint max_hz;
#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
*
* For driver model this is the per-child data used by the SPI bus. It can
* @flags: Indication of SPI flags.
*/
struct spi_slave {
-#ifdef CONFIG_DM_SPI
+#if CONFIG_IS_ENABLED(DM_SPI)
struct udevice *dev; /* struct spi_slave is dev->parentdata */
uint max_hz;
uint speed;
*/
int spi_cs_is_valid(unsigned int bus, unsigned int cs);
-#ifndef CONFIG_DM_SPI
+#if !CONFIG_IS_ENABLED(DM_SPI)
/**
* Activate a SPI chipselect.
* This function is provided by the board code when using a driver
return ret < 0 ? ret : din[1];
}
-#ifdef CONFIG_DM_SPI
+#if CONFIG_IS_ENABLED(DM_SPI)
/**
* struct spi_cs_info - Information about a bus chip select
* @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);