arm: omap: board-sdp3430: use sharp panel's gpio handling

The omap3430sdp board file currently requests gpios required by the sharp_ls dpi
panel, and provides platform_enable/disable callbacks to configure them.

These tasks have been moved to the sharp_ls panel driver itself and shouldn't
be done in the board files.

Remove the gpio requests and the platform callbacks from the board file.
Add the gpio information to panel_sharp_ls037v7dw01_data so that it's
passed to the panel driver.

Out of sharp panel's configurable pins, all apart from resb_gpio are managed by
a CPLD on the display and set to a default value. Only the configurable pin is
passed to platform data.

The backlight GPIO doesn't go directly to the sharp panel, it is used to set up
a voltage supply which goes to the LED+ pin of the panel, hence it isn't passed
to panel as platform data, and configured in the board file itself. The
backlight used to previously toggle through the platform_enable/disable
callbacks, but now it is always on. This needs to be revisited.

Signed-off-by: Archit Taneja <archit@ti.com>
Cc: Tony Lindgren <tony@atomide.com>

1 files changed, 18 insertions, 24 deletions

diff --git a/arch/arm/mach-omap2/board-3430sdp.c b/arch/arm/mach-omap2/board-3430sdp.c
index 2612eeaa5889..66cfcca0a707 100644
--- a/arch/arm/mach-omap2/board-3430sdp.c
+++ b/arch/arm/mach-omap2/board-3430sdp.c
@@ -108,34 +108,22 @@ static struct twl4030_keypad_data sdp3430_kp_data = {
 #define SDP3430_LCD_PANEL_BACKLIGHT_GPIO        8
 #define SDP3430_LCD_PANEL_ENABLE_GPIO           5
 
-static struct gpio sdp3430_dss_gpios[] __initdata = {
-        {SDP3430_LCD_PANEL_ENABLE_GPIO,    GPIOF_OUT_INIT_LOW, "LCD reset"    },
-        {SDP3430_LCD_PANEL_BACKLIGHT_GPIO, GPIOF_OUT_INIT_LOW, "LCD Backlight"},
-};
-
 static void __init sdp3430_display_init(void)
 {
         int r;
 
-        r = gpio_request_array(sdp3430_dss_gpios,
-                               ARRAY_SIZE(sdp3430_dss_gpios));
+        /*
+         * the backlight GPIO doesn't directly go to the panel, it enables
+         * an internal circuit on 3430sdp to create the signal V_BKL_28V,
+         * this is connected to LED+ pin of the sharp panel. This GPIO
+         * is left enabled in the board file, and not passed to the panel
+         * as platform_data.
+         */
+        r = gpio_request_one(SDP3430_LCD_PANEL_BACKLIGHT_GPIO,
+                                GPIOF_OUT_INIT_HIGH, "LCD Backlight");
         if (r)
-                printk(KERN_ERR "failed to get LCD control GPIOs\n");
-
-}
-
-static int sdp3430_panel_enable_lcd(struct omap_dss_device *dssdev)
-{
-        gpio_direction_output(SDP3430_LCD_PANEL_ENABLE_GPIO, 1);
-        gpio_direction_output(SDP3430_LCD_PANEL_BACKLIGHT_GPIO, 1);
-
-        return 0;
-}
+                pr_err("failed to get LCD Backlight GPIO\n");
 
-static void sdp3430_panel_disable_lcd(struct omap_dss_device *dssdev)
-{
-        gpio_direction_output(SDP3430_LCD_PANEL_ENABLE_GPIO, 0);
-        gpio_direction_output(SDP3430_LCD_PANEL_BACKLIGHT_GPIO, 0);
 }
 
 static int sdp3430_panel_enable_tv(struct omap_dss_device *dssdev)
@@ -147,14 +135,20 @@ static void sdp3430_panel_disable_tv(struct omap_dss_device *dssdev)
 {
 }
 
+static struct panel_sharp_ls037v7dw01_data sdp3430_lcd_data = {
+        .resb_gpio = SDP3430_LCD_PANEL_ENABLE_GPIO,
+        .ini_gpio = -1,
+        .mo_gpio = -1,
+        .lr_gpio = -1,
+        .ud_gpio = -1,
+};
 
 static struct omap_dss_device sdp3430_lcd_device = {
         .name                   = "lcd",
         .driver_name            = "sharp_ls_panel",
         .type                   = OMAP_DISPLAY_TYPE_DPI,
         .phy.dpi.data_lines     = 16,
-        .platform_enable        = sdp3430_panel_enable_lcd,
-        .platform_disable       = sdp3430_panel_disable_lcd,
+        .data                   = &sdp3430_lcd_data,
 };
 
 static struct tfp410_platform_data dvi_panel = {