ARM: OMAP2+: ads7846_init: put gpio_pendown into pdata if it's provided

If platform data is provided by the caller gpio_pendown is put into
unused static ads7846_config structure and effectively has no effect.
Of course caller can set gpio_pendown field in platform data himself
but it seems natural to do this in ads7846_init to remove duplication.
Signed-off-by: NIgor Grinberg <grinberg@compulab.co.il>
Signed-off-by: NIlya Yanok <yanok@emcraft.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/common-board-devices.c

@@ -76,13 +76,15 @@ void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
 			gpio_set_debounce(gpio_pendown, gpio_debounce);
 	}
 
-	ads7846_config.gpio_pendown = gpio_pendown;
-
 	spi_bi->bus_num	= bus_num;
 	spi_bi->irq	= OMAP_GPIO_IRQ(gpio_pendown);
 
-	if (board_pdata)
+	if (board_pdata) {
+		board_pdata->gpio_pendown = gpio_pendown;
 		spi_bi->platform_data = board_pdata;
+	} else {
+		ads7846_config.gpio_pendown = gpio_pendown;
+	}
 
 	spi_register_board_info(&ads7846_spi_board_info, 1);
 }