This patch adds machine specific support for LCD controller like setting power to LCD
and adding LCD platform device.
Signed-off-by: Prathyush K <prathyush.k@xxxxxxxxxxx>
Signed-off-by: Leela Krishna Amudala <l.krishna@xxxxxxxxxxx>
---
arch/arm/mach-exynos/mach-exynos5-dt.c | 57 ++++++++++++++++++++++++++++++++
1 files changed, 57 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-exynos/mach-exynos5-dt.c b/arch/arm/mach-exynos/mach-exynos5-dt.c
index 0a200fd..652a537 100644
--- a/arch/arm/mach-exynos/mach-exynos5-dt.c
+++ b/arch/arm/mach-exynos/mach-exynos5-dt.c
@@ -13,6 +13,7 @@
#include <linux/serial_core.h>
#include <linux/pwm_backlight.h>
#include <linux/gpio.h>
+#include <linux/delay.h>
#include <asm/mach/arch.h>
#include <asm/hardware/gic.h>
@@ -25,6 +26,8 @@
#include "common.h"
+#include <video/platform_lcd.h>
+
static int smdk5250_bl_notify(struct device *unused, int brightness)
{
@@ -48,6 +51,55 @@ static struct platform_pwm_backlight_data smdk5250_bl_data = {
.notify = smdk5250_bl_notify,
};
+static void lcd_set_power(struct plat_lcd_data *pd,
+ unsigned int power)
+{
+
+ /* reset */
+ gpio_request_one(EXYNOS5_GPX1(5), GPIOF_OUT_INIT_HIGH, "GPX1");
+
+ mdelay(20);
+ if (power) {
+ /* fire nRESET on power up */
+ gpio_set_value(EXYNOS5_GPX1(5), 0);
+ mdelay(20);
+ gpio_set_value(EXYNOS5_GPX1(5), 1);
+ mdelay(20);
+ gpio_free(EXYNOS5_GPX1(5));
+ } else {
+ /* fire nRESET on power off */
+ gpio_set_value(EXYNOS5_GPX1(5), 0);
+ mdelay(20);
+ gpio_set_value(EXYNOS5_GPX1(5), 1);
+ mdelay(20);
+ gpio_free(EXYNOS5_GPX1(5));
+ }
+ mdelay(20);
+
+ /*
+ * Request lcd_bl_en GPIO for smdk5250_bl_notify().
+ * TODO: Fix this so we are not at risk of requesting the GPIO
+ * multiple times, this should be done with device tree, and
+ * likely integrated into the plat-samsung/dev-backlight.c init.
+ */
+ gpio_request_one(EXYNOS5_GPX3(0), GPIOF_OUT_INIT_LOW, "GPX3");
+}
+
+static int smdk5250_match_fb(struct plat_lcd_data *pd, struct fb_info *info)
+{
+ /* Don't call .set_power callback while unblanking */
+ return 0;
+}
+
+static struct plat_lcd_data smdk5250_lcd_data = {
+ .set_power = lcd_set_power,
+ .match_fb = smdk5250_match_fb,
+};
+
+static struct platform_device smdk5250_lcd = {
+ .name = "platform-lcd",
+ .dev.platform_data = &smdk5250_lcd_data,
+};
/*
* The following lookup table is used to override device names when devices
* are registered from device tree. This is temporarily added to enable
@@ -80,6 +132,10 @@ static const struct of_dev_auxdata exynos5250_auxdata_lookup[] __initconst = {
{},
};
+static struct platform_device *smdk5250_devices[] __initdata = {
+ &smdk5250_lcd, /* for platform_lcd device */
+};
+
static void __init exynos5250_dt_map_io(void)
{
exynos_init_io(NULL, 0);
@@ -91,6 +147,7 @@ static void __init exynos5250_dt_machine_init(void)
samsung_bl_set(&smdk5250_bl_gpio_info, &smdk5250_bl_data);
of_platform_populate(NULL, of_default_bus_match_table,
exynos5250_auxdata_lookup, NULL);
+ platform_add_devices(smdk5250_devices, ARRAY_SIZE(smdk5250_devices));
}
static char const *exynos5250_dt_compat[] __initdata = {
--
1.7.0.4
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