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board: ge: bx50v3: Use pwm for display backlight 

Setup the LCD backlight brightness control pin to use PWM

Signed-off-by: Akshay Bhat <akshay.bhat@timesys.com>
Cc: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Akshay Bhat 2016-04-12 18:13:59 -04:00 committed by Stefano Babic
parent 494d43ec35
commit 54971ac6de
2 changed files with 14 additions and 0 deletions
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11
board/ge/bx50v3/bx50v3.c
View File

@ -25,6 +25,7 @@
#include <asm/io.h> #include <asm/io.h>
#include <asm/arch/sys_proto.h> #include <asm/arch/sys_proto.h>
#include <i2c.h> #include <i2c.h>
#include <pwm.h>
DECLARE_GLOBAL_DATA_PTR; DECLARE_GLOBAL_DATA_PTR;
#define NC_PAD_CTRL (PAD_CTL_PUS_100K_UP | \ #define NC_PAD_CTRL (PAD_CTL_PUS_100K_UP | \
@ -328,6 +329,8 @@ static iomux_v3_cfg_t const backlight_pads[] = {
/* Backlight enable for LVDS display */ /* Backlight enable for LVDS display */
MX6_PAD_GPIO_0__GPIO1_IO00 | MUX_PAD_CTRL(NO_PAD_CTRL), MX6_PAD_GPIO_0__GPIO1_IO00 | MUX_PAD_CTRL(NO_PAD_CTRL),
#define LVDS_BACKLIGHT_GP IMX_GPIO_NR(1, 0) #define LVDS_BACKLIGHT_GP IMX_GPIO_NR(1, 0)
/* backlight PWM brightness control */
MX6_PAD_SD1_DAT3__PWM1_OUT | MUX_PAD_CTRL(NO_PAD_CTRL),
}; };
static void do_enable_hdmi(struct display_info_t const *dev) static void do_enable_hdmi(struct display_info_t const *dev)
@ -595,9 +598,17 @@ int board_late_init(void)
* as per specifications from CHI MEI */ * as per specifications from CHI MEI */
mdelay(250); mdelay(250);
/* enable backlight PWM 1 */
pwm_init(0, 0, 0);
/* duty cycle 5000000ns, period: 5000000ns */
pwm_config(0, 5000000, 5000000);
/* Backlight Power */ /* Backlight Power */
gpio_direction_output(LVDS_BACKLIGHT_GP, 1); gpio_direction_output(LVDS_BACKLIGHT_GP, 1);
pwm_enable(0);
return 0; return 0;
} }

3
include/configs/ge_bx50v3.h
View File

@ -327,6 +327,9 @@
#define CONFIG_IMX_HDMI #define CONFIG_IMX_HDMI
#define CONFIG_IMX_VIDEO_SKIP #define CONFIG_IMX_VIDEO_SKIP
#define CONFIG_PWM_IMX
#define CONFIG_IMX6_PWM_PER_CLK 66000000
#undef CONFIG_CMD_PCI #undef CONFIG_CMD_PCI
#ifdef CONFIG_CMD_PCI #ifdef CONFIG_CMD_PCI
#define CONFIG_PCI #define CONFIG_PCI