Setup the LCD backlight brightness control pin to use PWM
Signed-off-by: Akshay Bhat <[email protected]>
Cc: Stefano Babic <[email protected]>
---
board/ge/bx50v3/bx50v3.c | 11 +++++++++++
include/configs/ge_bx50v3.h | 3 +++
2 files changed, 14 insertions(+)
diff --git a/board/ge/bx50v3/bx50v3.c b/board/ge/bx50v3/bx50v3.c
index bbecc3b..b6db91b 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 UART_PAD_CTRL (PAD_CTL_PUS_100K_UP | \
@@ -324,6 +325,8 @@ 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)
@@ -585,9 +588,17 @@ 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;
}
diff --git a/include/configs/ge_bx50v3.h b/include/configs/ge_bx50v3.h
index 6fa4a9a..e37cd33 100644
--- a/include/configs/ge_bx50v3.h
+++ b/include/configs/ge_bx50v3.h
@@ -327,6 +327,9 @@
#define CONFIG_IMX_HDMI
#define CONFIG_IMX_VIDEO_SKIP
+#define CONFIG_PWM_IMX
+#define CONFIG_IMX6_PWM_PER_CLK 66000000
+
#undef CONFIG_CMD_PCI
#ifdef CONFIG_CMD_PCI
#define CONFIG_PCI
--
2.8.1
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