[PATCH 06/12] ARM: davinci: da850-evm: model the backlight GPIO as an actual device

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszew...@baylibre.com>

Instead of enabling the panel backlight in a callback defined in board
file using deprecated legacy GPIO API calls, model the line as a GPIO
backlight device.

Signed-off-by: Bartosz Golaszewski <bgolaszew...@baylibre.com>
---
 arch/arm/mach-davinci/board-da850-evm.c | 40 +++++++++++++++++--------
 1 file changed, 28 insertions(+), 12 deletions(-)

diff --git a/arch/arm/mach-davinci/board-da850-evm.c 
b/arch/arm/mach-davinci/board-da850-evm.c
index 31ae3be5741d..ffda623bb543 100644
--- a/arch/arm/mach-davinci/board-da850-evm.c
+++ b/arch/arm/mach-davinci/board-da850-evm.c
@@ -36,6 +36,7 @@
 #include <linux/platform_data/ti-aemif.h>
 #include <linux/platform_data/spi-davinci.h>
 #include <linux/platform_data/uio_pruss.h>
+#include <linux/property.h>
 #include <linux/regulator/machine.h>
 #include <linux/regulator/tps6507x.h>
 #include <linux/regulator/fixed.h>
@@ -803,34 +804,49 @@ static const short da850_evm_mmcsd0_pins[] __initconst = {
 
 static void da850_panel_power_ctrl(int val)
 {
-       /* lcd backlight */
-       gpio_set_value(DA850_LCD_BL_PIN, val);
-
        /* lcd power */
        gpio_set_value(DA850_LCD_PWR_PIN, val);
 }
 
+static struct property_entry da850_lcd_backlight_props[] = {
+       PROPERTY_ENTRY_BOOL("default-on"),
+       { }
+};
+
+static struct gpiod_lookup_table da850_lcd_backlight_gpio_table = {
+       .dev_id         = "gpio-backlight",
+       .table = {
+               GPIO_LOOKUP("davinci_gpio", DA850_LCD_BL_PIN, NULL, 0),
+               { }
+       },
+};
+
+static const struct platform_device_info da850_lcd_backlight_info = {
+       .name           = "gpio-backlight",
+       .id             = PLATFORM_DEVID_NONE,
+       .properties     = da850_lcd_backlight_props,
+};
+
 static int da850_lcd_hw_init(void)
 {
+       struct platform_device *backlight;
        int status;
 
-       status = gpio_request(DA850_LCD_BL_PIN, "lcd bl");
-       if (status < 0)
-               return status;
+       gpiod_add_lookup_table(&da850_lcd_backlight_gpio_table);
+       backlight = platform_device_register_full(&da850_lcd_backlight_info);
+       if (IS_ERR(backlight))
+               return PTR_ERR(backlight);
 
        status = gpio_request(DA850_LCD_PWR_PIN, "lcd pwr");
-       if (status < 0) {
-               gpio_free(DA850_LCD_BL_PIN);
+       if (status < 0)
                return status;
-       }
 
-       gpio_direction_output(DA850_LCD_BL_PIN, 0);
        gpio_direction_output(DA850_LCD_PWR_PIN, 0);
 
-       /* Switch off panel power and backlight */
+       /* Switch off panel power */
        da850_panel_power_ctrl(0);
 
-       /* Switch on panel power and backlight */
+       /* Switch on panel power */
        da850_panel_power_ctrl(1);
 
        return 0;
-- 
2.21.0