spi: new spi->mode bits

Add two new spi_device.mode bits to accomodate more protocol options, and
pass them through to usermode drivers:

 * SPI_NO_CS ... a second 3-wire variant, where the chipselect
   line is removed instead of a data line; transfers are still
   full duplex.

   This obviously has STRONG protocol implications since the
   chipselect transitions can't be used to synchronize state
   transitions with the SPI master.

 * SPI_READY ... defines open drain signal that's pulled low
   to pause the clock.  This defines a 5-wire variant (normal
   4-wire SPI plus READY) and two 4-wire variants (READY plus
   each of the 3-wire flavors).

   Such hardware flow control can be a big win.  There are ADC
   converters and flash chips that expose READY signals, but not
   many host controllers support it today.

The spi_bitbang code should be changed to use SPI_NO_CS instead of its
current nonportable hack.  That's a mode most hardware can easily support
(unlike SPI_READY).

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: "Paulraj, Sandeep" <s-paulraj@ti.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/spi/spidev_test.c b/Documentation/spi/spidev_test.c
index cf0e3ce..c1a5aad 100644 (file)
--- a/Documentation/spi/spidev_test.c
+++ b/Documentation/spi/spidev_test.c
@@ -99,11 +99,13 @@ void parse_opts(int argc, char *argv[])
                        { "lsb",     0, 0, 'L' },
                        { "cs-high", 0, 0, 'C' },
                        { "3wire",   0, 0, '3' },
+                       { "no-cs",   0, 0, 'N' },
+                       { "ready",   0, 0, 'R' },
                        { NULL, 0, 0, 0 },
                };
                int c;
 
-               c = getopt_long(argc, argv, "D:s:d:b:lHOLC3", lopts, NULL);
+               c = getopt_long(argc, argv, "D:s:d:b:lHOLC3NR", lopts, NULL);
 
                if (c == -1)
                        break;
@@ -139,6 +141,12 @@ void parse_opts(int argc, char *argv[])
                case '3':
                        mode |= SPI_3WIRE;
                        break;
+               case 'N':
+                       mode |= SPI_NO_CS;
+                       break;
+               case 'R':
+                       mode |= SPI_READY;
+                       break;
                default:
                        print_usage(argv[0]);
                        break;

diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index 5d869c4..606e7a4 100644 (file)
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -58,15 +58,20 @@ static unsigned long        minors[N_SPI_MINORS / BITS_PER_LONG];
 
 
 /* Bit masks for spi_device.mode management.  Note that incorrect
- * settings for CS_HIGH and 3WIRE can cause *lots* of trouble for other
- * devices on a shared bus:  CS_HIGH, because this device will be
- * active when it shouldn't be;  3WIRE, because when active it won't
- * behave as it should.
+ * settings for some settings can cause *lots* of trouble for other
+ * devices on a shared bus:
  *
- * REVISIT should changing those two modes be privileged?
+ *  - CS_HIGH ... this device will be active when it shouldn't be
+ *  - 3WIRE ... when active, it won't behave as it should
+ *  - NO_CS ... there will be no explicit message boundaries; this
+ *     is completely incompatible with the shared bus model
+ *  - READY ... transfers may proceed when they shouldn't.
+ *
+ * REVISIT should changing those flags be privileged?
  */
 #define SPI_MODE_MASK          (SPI_CPHA | SPI_CPOL | SPI_CS_HIGH \
-                               | SPI_LSB_FIRST | SPI_3WIRE | SPI_LOOP)
+                               | SPI_LSB_FIRST | SPI_3WIRE | SPI_LOOP \
+                               | SPI_NO_CS | SPI_READY)
 
 struct spidev_data {
        dev_t                   devt;

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 9c4cd27..743c933 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;

diff --git a/include/linux/spi/spidev.h b/include/linux/spi/spidev.h
index 95251cc..bf0570a 100644 (file)
--- a/include/linux/spi/spidev.h
+++ b/include/linux/spi/spidev.h
@@ -40,6 +40,8 @@
 #define SPI_LSB_FIRST          0x08
 #define SPI_3WIRE              0x10
 #define SPI_LOOP               0x20
+#define SPI_NO_CS              0x40
+#define SPI_READY              0x80
 
 /*---------------------------------------------------------------------------*/