ARM: OMAP1: osk5912: Mistral eeprom support

List the 4 Kbit I2C EEPROM included on the Mistral board.

Also add a comment about the hardware workaround needed to
properly support the WAKE button.  More info at

  http://elinux.org/OSK_Mistral_wakeup_button_mod

Still no support for the (optional) camera sensor.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 27 insertions, 2 deletions

diff --git a/arch/arm/mach-omap1/board-osk.c b/arch/arm/mach-omap1/board-osk.c
index 2f880958b83..4b7c1bcbed6 100644
--- a/arch/arm/mach-omap1/board-osk.c
+++ b/arch/arm/mach-omap1/board-osk.c
@@ -260,7 +260,6 @@ static struct i2c_board_info __initdata osk_i2c_board_info[] = {
         },
         /* TODO when driver support is ready:
          *  - aic23 audio chip at 0x1a
-         *  - on Mistral, 24c04 eeprom at 0x50
          *  - optionally on Mistral, ov9640 camera sensor at 0x30
          */
 };
@@ -337,11 +336,28 @@ static struct omap_board_config_kernel osk_config[] __initdata = {
 #ifdef  CONFIG_OMAP_OSK_MISTRAL
 
 #include <linux/input.h>
+#include <linux/i2c/at24.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/ads7846.h>
 
 #include <mach/keypad.h>
 
+static struct at24_platform_data at24c04 = {
+        .byte_len       = SZ_4K / 8,
+        .page_size      = 16,
+};
+
+static struct i2c_board_info __initdata mistral_i2c_board_info[] = {
+        {
+                /* NOTE:  powered from LCD supply */
+                I2C_BOARD_INFO("24c04", 0x50),
+                .platform_data  = &at24c04,
+        },
+        /* TODO when driver support is ready:
+         *  - optionally ov9640 camera sensor at 0x30
+         */
+};
+
 static const int osk_keymap[] = {
         /* KEY(col, row, code) */
         KEY(0, 0, KEY_F1),              /* SW4 */
@@ -488,7 +504,13 @@ static void __init osk_mistral_init(void)
         spi_register_board_info(mistral_boardinfo,
                         ARRAY_SIZE(mistral_boardinfo));
 
-        /* the sideways button (SW1) is for use as a "wakeup" button */
+        /* the sideways button (SW1) is for use as a "wakeup" button
+         *
+         * NOTE:  The Mistral board has the wakeup button (SW1) wired
+         * to the LCD 3.3V rail, which is powered down during suspend.
+         * To allow this button to wake up the omap, work around this
+         * HW bug by rewiring SW1 to use the main 3.3V rail.
+         */
         omap_cfg_reg(N15_1610_MPUIO2);
         if (gpio_request(OMAP_MPUIO(2), "wakeup") == 0) {
                 int ret = 0;
@@ -521,6 +543,9 @@ static void __init osk_mistral_init(void)
         if (gpio_request(2, "lcd_pwr") == 0)
                 gpio_direction_output(2, 1);
 
+        i2c_register_board_info(1, mistral_i2c_board_info,
+                        ARRAY_SIZE(mistral_i2c_board_info));
+
         platform_add_devices(mistral_devices, ARRAY_SIZE(mistral_devices));
 }
 #else