beagle: two more GPIOs

Request two more GPIOs on Beagle:  MMC write protect, DVI enable.

Also define the first OMAP3 GPIO mux config symbols, with a new
naming convention.  Examples:

  - GPIO42 is bidirectional, and uses external pull up/down (if any);
  - GPIO42_UP is bidirectional, with an internal pullup;
  - GPIO42_DOWN is bidirectional, with an internal pulldown.
  - GPIO42_OUT is output-only, and needs no pullup or pulldown.

All of those would be fully functional through the standard GPIO
interface as well as the legacy OMAP-only one, except GPIO42_OUT
which won't let you read the actual pin value after setting it.

There's no special off-mode support for these particular pins;
on Beagle they have external pullups or pulldowns.

(OMAP2 can use this naming convention too, except that since it
has no input-enable the "_OUT" convention can't be used there.)
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/board-omap3beagle.c

@@ -43,6 +43,7 @@
 #include <mach/common.h>
 #include <mach/gpmc.h>
 #include <mach/nand.h>
+#include <mach/mux.h>
 
 
 #define GPMC_CS0_BASE  0x60
@@ -291,7 +292,17 @@ static void __init omap3_beagle_init(void)
 	omap_board_config = omap3_beagle_config;
 	omap_board_config_size = ARRAY_SIZE(omap3_beagle_config);
 	omap_serial_init();
+
+	omap_cfg_reg(AH8_34XX_GPIO29);
+	gpio_request(29, "mmc0_wp");
+	gpio_direction_input(29);
 	hsmmc_init();
+
+	omap_cfg_reg(J25_34XX_GPIO170);
+	gpio_request(170, "DVI_nPD");
+	/* REVISIT leave DVI powered down until it's needed ... */
+	gpio_direction_output(170, true);
+
 	usb_musb_init();
 	usb_ehci_init();
 	omap3beagle_flash_init();

arch/arm/mach-omap2/mux.c

@@ -416,6 +416,14 @@ MUX_CFG_34XX("AD2_3430_USB3FS_PHY_MM3_TXDAT", 0x188,
 MUX_CFG_34XX("AC1_3430_USB3FS_PHY_MM3_TXEN_N", 0x18a,
 		OMAP34XX_MUX_MODE6 | OMAP34XX_PIN_OUTPUT)
 
+
+/* 34XX GPIO - bidirectional, unless the name has an "_OUT" suffix.
+ * No internal pullup/pulldown without "_UP" or "_DOWN" suffix.
+ */
+MUX_CFG_34XX("AH8_34XX_GPIO29", 0x5fa,
+		OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_INPUT)
+MUX_CFG_34XX("J25_34XX_GPIO170", 0x1c6,
+		OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_INPUT)
 };
 
 #define OMAP34XX_PINS_SZ	ARRAY_SIZE(omap34xx_pins)

arch/arm/plat-omap/include/mach/mux.h

@@ -749,6 +749,14 @@ enum omap34xx_index {
 	AD2_3430_USB3FS_PHY_MM3_TXDAT,
 	AC1_3430_USB3FS_PHY_MM3_TXEN_N,
 
+	/* 34xx GPIO
+	 *  - normally these are bidirectional, no internal pullup/pulldown
+	 *  - "_UP" suffix (GPIO3_UP) if internal pullup is configured
+	 *  - "_DOWN" suffix (GPIO3_DOWN) with internal pulldown
+	 *  - "_OUT" suffix (GPIO3_OUT) for output-only pins (unlike 24xx)
+	 */
+	AH8_34XX_GPIO29,
+	J25_34XX_GPIO170,
 };
 
 struct omap_mux_cfg {