diff options
Diffstat (limited to 'include/spi.h')
| -rw-r--r-- | include/spi.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/spi.h b/include/spi.h index ad9248b..e2563c9 100644 --- a/include/spi.h +++ b/include/spi.h @@ -29,10 +29,13 @@ #define SPI_XFER_END 0x02 /* Deassert CS after transfer */ #define SPI_XFER_MMAP 0x08 /* Memory Mapped start */ #define SPI_XFER_MMAP_END 0x10 /* Memory Mapped End */ +#define SPI_XFER_ONCE (SPI_XFER_BEGIN | SPI_XFER_END) /* Header byte that marks the start of the message */ #define SPI_PREAMBLE_END_BYTE 0xec +#define SPI_DEFAULT_WORDLEN 8 + /** * struct spi_slave - Representation of a SPI slave * @@ -40,6 +43,7 @@ * * @bus: ID of the bus that the slave is attached to. * @cs: ID of the chip select connected to the slave. + * @wordlen: Size of SPI word in number of bits * @max_write_size: If non-zero, the maximum number of bytes which can * be written at once, excluding command bytes. * @memory_map: Address of read-only SPI flash access. @@ -47,6 +51,7 @@ struct spi_slave { unsigned int bus; unsigned int cs; + unsigned int wordlen; unsigned int max_write_size; void *memory_map; }; @@ -153,6 +158,18 @@ int spi_claim_bus(struct spi_slave *slave); void spi_release_bus(struct spi_slave *slave); /** + * Set the word length for SPI transactions + * + * Set the word length (number of bits per word) for SPI transactions. + * + * @slave: The SPI slave + * @wordlen: The number of bits in a word + * + * Returns: 0 on success, -1 on failure. + */ +int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen); + +/** * SPI transfer * * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks |