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video: exynos_fb: configure backlight GPIOs if specified in DT

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Add support to configure PWM_OUT(PWM output) GPIO and
BL_EN(backlight enable) GPIO, if provided in FIMD DT node.

Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Ajay Kumar 2015-03-04 19:05:26 +05:30 committed by Minkyu Kang
parent 6102560891
commit 9018efa7e2
2 changed files with 23 additions and 0 deletions
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2
doc/device-tree-bindings/video/exynos-fb.txt
View file

@ -61,6 +61,8 @@ Board(panel specific):
disabled with compatible string
"samsung,sysmmu-v3.3", with a "reg" property
holding the register address of FIMD sysmmu.
samsung,pwm-out-gpio: PWM output GPIO.
samsung,bl-en-gpio: backlight enable GPIO.
Example:
SOC specific part:

21
drivers/video/exynos_fb.c
View file

@ -19,6 +19,7 @@
#include <asm/arch/mipi_dsim.h>
#include <asm/arch/dp_info.h>
#include <asm/arch/system.h>
#include <asm/gpio.h>
#include <asm-generic/errno.h>
#include "exynos_fb.h"
@ -102,6 +103,10 @@ __weak int exynos_lcd_misc_init(vidinfo_t *vid)
static void lcd_panel_on(vidinfo_t *vid)
{
struct gpio_desc pwm_out_gpio;
struct gpio_desc bl_en_gpio;
unsigned int node;
udelay(vid->init_delay);
exynos_backlight_reset();
@ -121,6 +126,22 @@ static void lcd_panel_on(vidinfo_t *vid)
exynos_backlight_on(1);
#ifdef CONFIG_OF_CONTROL
node = fdtdec_next_compatible(gd->fdt_blob, 0,
COMPAT_SAMSUNG_EXYNOS_FIMD);
if (node <= 0) {
debug("FIMD: Can't get device node for FIMD\n");
return;
}
gpio_request_by_name_nodev(gd->fdt_blob, node, "samsung,pwm-out-gpio",
0, &pwm_out_gpio,
GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
gpio_request_by_name_nodev(gd->fdt_blob, node, "samsung,bl-en-gpio", 0,
&bl_en_gpio,
GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
#endif
exynos_cfg_ldo();
exynos_enable_ldo(1);