[U-Boot] [PATCH] board: ge: bx50v3: Use pwm for display backlight

[Akshay Bhat]

On Tue, Mar 15, 2016 at 2:24 PM, Akshay Bhat <akshay.bhat at timesys.com>
wrote:

> Setup the LCD backlight brightness control pin to use PWM
>
> Signed-off-by: Akshay Bhat <akshay.bhat at timesys.com>
> Cc: Stefano Babic <sbabic at denx.de>
> ---
>

Hi Stefano,

Can this be applied if there are no review comments?

Thanks,
Akshay


>  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 cf2cd1a..8e55acf 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)
> @@ -676,9 +679,17 @@ 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
> --
> 2.7.3
>
>