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authorAkshay Bhat <akshay.bhat@timesys.com>2016-04-12 18:13:59 -0400
committerStefano Babic <sbabic@denx.de>2016-04-19 16:05:51 +0200
commit54971ac6de20b8834882efb69dc6ad5c1d4a9915 (patch)
treedfdc80dee546d27e632cb120d7352ee1945700da /board
parent494d43ec35ff3d27926ed9d668e0df4b7e6ae6d3 (diff)
downloadtalos-obmc-uboot-54971ac6de20b8834882efb69dc6ad5c1d4a9915.tar.gz
talos-obmc-uboot-54971ac6de20b8834882efb69dc6ad5c1d4a9915.zip
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>
Diffstat (limited to 'board')
-rw-r--r--board/ge/bx50v3/bx50v3.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/board/ge/bx50v3/bx50v3.c b/board/ge/bx50v3/bx50v3.c
index 3acd4fa2d8..dcf51dd7d0 100644
--- a/board/ge/bx50v3/bx50v3.c
+++ b/board/ge/bx50v3/bx50v3.c
@@ -25,6 +25,7 @@
#include <asm/io.h>
#include <asm/arch/sys_proto.h>
#include <i2c.h>
+#include <pwm.h>
DECLARE_GLOBAL_DATA_PTR;
#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 */
MX6_PAD_GPIO_0__GPIO1_IO00 | MUX_PAD_CTRL(NO_PAD_CTRL),
#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)
@@ -595,9 +598,17 @@ int board_late_init(void)
* as per specifications from CHI MEI */
mdelay(250);
+ /* enable backlight PWM 1 */
+ pwm_init(0, 0, 0);
+
+ /* duty cycle 5000000ns, period: 5000000ns */
+ pwm_config(0, 5000000, 5000000);
+
/* Backlight Power */
gpio_direction_output(LVDS_BACKLIGHT_GP, 1);
+ pwm_enable(0);
+
return 0;
}
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