spi: add spi_master flag word

[deliverable/linux.git] / include / linux / spi / spi.h

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 9c4cd27f4685250c274c375951ec695615dbe8ea..c47c4b4da97e5a606ab2823d3126a32f42e446f0 100644 (file)
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -80,6 +80,8 @@ struct spi_device {
 #define        SPI_LSB_FIRST   0x08                    /* per-word bits-on-wire */
 #define        SPI_3WIRE       0x10                    /* SI/SO signals shared */
 #define        SPI_LOOP        0x20                    /* loopback mode */
+#define        SPI_NO_CS       0x40                    /* 1 dev/bus, no chipselect */
+#define        SPI_READY       0x80                    /* slave pulls low to pause */
        u8                      bits_per_word;
        int                     irq;
        void                    *controller_state;
@@ -248,6 +250,10 @@ struct spi_master {
        /* spi_device.mode flags understood by this controller driver */
        u16                     mode_bits;
 
+       /* other constraints relevant to this driver */
+       u16                     flags;
+#define SPI_MASTER_HALF_DUPLEX BIT(0)          /* can't do full duplex */
+
        /* Setup mode and clock, etc (spi driver may call many times).
         *
         * IMPORTANT:  this may be called when transfers to another