USB: pxa2xx_udc understands GPIO based VBUS sensing

This updates the PXA 25x UDC board-independent infrastructure for VBUS sensing
and the D+ pullup.  The original code evolved from rather bizarre support on
Intel's "Lubbock" reference hardware, so that on more sensible hardware it
doesn't work as well as it could/should.

The change is just to teach the UDC driver how to use built-in PXA GPIO pins
directly.  This reduces the amount of board-specfic object code needed, and
enables the use of a VBUS sensing IRQ on boards (like Gumstix) that have one.
With VBUS sensing, the UDC is unclocked until a host is actually connected.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/asm-arm/arch-pxa/udc.h b/include/asm-arm/arch-pxa/udc.h
index 30548a30c773..121cd241115d 100644
--- a/include/asm-arm/arch-pxa/udc.h
+++ b/include/asm-arm/arch-pxa/udc.h
@@ -12,6 +12,14 @@ struct pxa2xx_udc_mach_info {
         void (*udc_command)(int cmd);
 #define PXA2XX_UDC_CMD_CONNECT          0       /* let host see us */
 #define PXA2XX_UDC_CMD_DISCONNECT       1       /* so host won't see us */
+
+        /* Boards following the design guidelines in the developer's manual,
+         * with on-chip GPIOs not Lubbock's wierd hardware, can have a sane
+         * VBUS IRQ and omit the methods above.  Store the GPIO number
+         * here; for GPIO 0, also mask in one of the pxa_gpio_mode() bits.
+         */
+        u16     gpio_vbus;                      /* high == vbus present */
+        u16     gpio_pullup;                    /* high == pullup activated */
 };
 
 extern void pxa_set_udc_info(struct pxa2xx_udc_mach_info *info);