1 files changed, 9 insertions, 6 deletions

diff --git a/include/linux/spi/mcp23s08.h b/include/linux/spi/mcp23s08.h
index 22ef107d770..c42cff8ca19 100644
--- a/include/linux/spi/mcp23s08.h
+++ b/include/linux/spi/mcp23s08.h
@@ -2,21 +2,24 @@
 /* FIXME driver should be able to handle IRQs...  */
 
 struct mcp23s08_chip_info {
-        bool    is_present;             /* true iff populated */
-        u8      pullups;                /* BIT(x) means enable pullup x */
+        bool            is_present;     /* true if populated */
+        unsigned        pullups;        /* BIT(x) means enable pullup x */
 };
 
 struct mcp23s08_platform_data {
-        /* Four slaves (numbered 0..3) can share one SPI chipselect, and
-         * will provide 8..32 GPIOs using 1..4 gpio_chip instances.
+        /* For mcp23s08, up to 4 slaves (numbered 0..3) can share one SPI
+         * chipselect, each providing 1 gpio_chip instance with 8 gpios.
+         * For mpc23s17, up to 8 slaves (numbered 0..7) can share one SPI
+         * chipselect, each providing 1 gpio_chip (port A + port B) with
+         * 16 gpios.
          */
-        struct mcp23s08_chip_info       chip[4];
+        struct mcp23s08_chip_info       chip[8];
 
         /* "base" is the number of the first GPIO.  Dynamic assignment is
          * not currently supported, and even if there are gaps in chip
          * addressing the GPIO numbers are sequential .. so for example
          * if only slaves 0 and 3 are present, their GPIOs range from
-         * base to base+15.
+         * base to base+15 (or base+31 for s17 variant).
          */
         unsigned        base;