davinci: Add LCD Graphics support for DA830/OMAP-L137 EVM

Add graphics support for the Sharp LCD035Q3DG01 graphical
LCD that's on the User Interface (UI) daughter card of the
DA830/OMAP-L137 EVM.

The LCD shares EMIFA lines with the NAND and NOR devices that
are also on the UI card so those lines are shared via a couple
of muxes.  The muxes are controlled by the 'MUX_MODE' line on
the UI card.  The 'MUX_MODE' line is controlled by pin P6 of
a pcf8574 i2c expander that's at i2c address 0x3f on UI card.
The i2c expander is controlled using the gpio infrastructure
from the board code using the 'setup()' and 'teardown()'
routines.

Signed-off-by: Steve Chen <schen@mvista.com>
Signed-off-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 43 insertions, 1 deletions

diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
index fe86afa7ea2e..fb941eb1f4da 100644
--- a/arch/arm/mach-davinci/board-da830-evm.c
+++ b/arch/arm/mach-davinci/board-da830-evm.c
@@ -13,7 +13,9 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/console.h>
+#include <linux/gpio.h>
 #include <linux/i2c.h>
+#include <linux/i2c/pcf857x.h>
 #include <linux/i2c/at24.h>
 
 #include <asm/mach-types.h>
@@ -38,6 +40,31 @@ static struct at24_platform_data da830_evm_i2c_eeprom_info = {
         .context        = (void *)0x7f00,
 };
 
+static int da830_evm_ui_expander_setup(struct i2c_client *client, int gpio,
+                unsigned ngpio, void *context)
+{
+        gpio_request(gpio + 6, "MUX_MODE");
+#ifdef CONFIG_DA830_UI_LCD
+        gpio_direction_output(gpio + 6, 0);
+#else /* Must be NAND or NOR */
+        gpio_direction_output(gpio + 6, 1);
+#endif
+        return 0;
+}
+
+static int da830_evm_ui_expander_teardown(struct i2c_client *client, int gpio,
+                unsigned ngpio, void *context)
+{
+        gpio_free(gpio + 6);
+        return 0;
+}
+
+static struct pcf857x_platform_data da830_evm_ui_expander_info = {
+        .gpio_base      = DAVINCI_N_GPIO,
+        .setup          = da830_evm_ui_expander_setup,
+        .teardown       = da830_evm_ui_expander_teardown,
+};
+
 static struct i2c_board_info __initdata da830_evm_i2c_devices[] = {
         {
                 I2C_BOARD_INFO("24c256", 0x50),
@@ -45,7 +72,11 @@ static struct i2c_board_info __initdata da830_evm_i2c_devices[] = {
         },
         {
                 I2C_BOARD_INFO("tlv320aic3x", 0x18),
-        }
+        },
+        {
+                I2C_BOARD_INFO("pcf8574", 0x3f),
+                .platform_data  = &da830_evm_ui_expander_info,
+        },
 };
 
 static struct davinci_i2c_platform_data da830_evm_i2c_0_pdata = {
@@ -186,6 +217,17 @@ static __init void da830_evm_init(void)
         da8xx_register_mcasp(1, &da830_evm_snd_data);
 
         da830_evm_init_mmc();
+
+#ifdef CONFIG_DA830_UI_LCD
+        ret = da8xx_pinmux_setup(da830_lcdcntl_pins);
+        if (ret)
+                pr_warning("da830_evm_init: lcdcntl mux setup failed: %d\n",
+                                ret);
+
+        ret = da8xx_register_lcdc(&sharp_lcd035q3dg01_pdata);
+        if (ret)
+                pr_warning("da830_evm_init: lcd setup failed: %d\n", ret);
+#endif
 }
 
 #ifdef CONFIG_SERIAL_8250_CONSOLE