recipes-kernel/linux/linux-ti33x-psp-3.2/beaglebone/0015-beaglebone-enable-PWM-for-lcd-backlight-backlight-is.patch

   1 From 46c7fc0ed1ad0e5da431d15a4333a4fb5bb0ff0e Mon Sep 17 00:00:00 2001
   2 From: Koen Kooi <koen@dominion.thruhere.net>
   3 Date: Tue, 31 Jan 2012 17:02:10 +0100
   4 Subject: [PATCH 15/26] beaglebone: enable PWM for lcd backlight <- backlight
   5  is inverted
   6
   7 Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
   8 ---
   9  arch/arm/mach-omap2/board-am335xevm.c |   51 +++++++++++++++++++++++++++------
  10  1 file changed, 42 insertions(+), 9 deletions(-)
  11
  12 diff --git a/arch/arm/mach-omap2/board-am335xevm.c b/arch/arm/mach-omap2/board-am335xevm.c
  13 index 3c67e94..23b59c2 100644
  14 --- a/arch/arm/mach-omap2/board-am335xevm.c
  15 +++ b/arch/arm/mach-omap2/board-am335xevm.c
  16 @@ -179,6 +179,16 @@ static const struct display_panel bbtoys7_panel = {
  17         COLOR_ACTIVE,
  18  };
  19
  20 +#define BBTOYS7LCD_PWM_DEVICE_ID   "ehrpwm.1:0"
  21 +
  22 +static struct platform_pwm_backlight_data bbtoys7lcd_backlight_data = {
  23 +       .pwm_id         = BBTOYS7LCD_PWM_DEVICE_ID,
  24 +       .ch             = -1,
  25 +       .max_brightness = AM335X_BACKLIGHT_MAX_BRIGHTNESS,
  26 +       .dft_brightness = AM335X_BACKLIGHT_DEFAULT_BRIGHTNESS,
  27 +       .pwm_period_ns  = AM335X_PWM_PERIOD_NANO_SECONDS,
  28 +};
  29 +
  30  static struct lcd_ctrl_config bbtoys7_cfg = {
  31         &bbtoys7_panel,
  32         .ac_bias                = 255,
  33 @@ -599,9 +609,9 @@ static struct pinmux_config bbtoys7_pin_mux[] = {
  34         {"lcd_vsync.lcd_vsync",         OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
  35         {"lcd_hsync.lcd_hsync",         OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
  36         {"lcd_pclk.lcd_pclk",           OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
  37 -       {"lcd_ac_bias_en.lcd_ac_bias_en", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
  38 -       {"gpmc_a2.gpio1_18", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT}, // Backlight
  39 +       {"lcd_ac_bias_en.lcd_ac_bias_en", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
  40         {"ecap0_in_pwm0_out.gpio0_7", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT}, // AVDD_EN
  41 +       {"gpmc_a2.ehrpwm1A", OMAP_MUX_MODE6 | AM33XX_PIN_OUTPUT}, // Backlight
  42         {NULL, 0},
  43  };
  44
  45 @@ -1134,6 +1144,7 @@ static struct pinmux_config ecap0_pin_mux[] = {
  46         {NULL, 0},
  47  };
  48
  49 +static int ehrpwm_backlight_enable;
  50  static int backlight_enable;
  51
  52  #define AM335XEVM_WLAN_PMENA_GPIO      GPIO_TO_PIN(1, 30)
  53 @@ -1216,6 +1227,30 @@ static int __init ecap0_init(void)
  54  }
  55  late_initcall(ecap0_init);
  56
  57 +static void enable_ehrpwm1(int evm_id, int profile)
  58 +{
  59 +       ehrpwm_backlight_enable = true;
  60 +}
  61 +
  62 +/* Setup pwm-backlight for bbtoys7lcd */
  63 +static struct platform_device bbtoys7lcd_backlight = {
  64 +       .name           = "pwm-backlight",
  65 +       .id             = -1,
  66 +       .dev            = {
  67 +               .platform_data  = &bbtoys7lcd_backlight_data,
  68 +       }
  69 +};
  70 +
  71 +static int __init ehrpwm1_init(void)
  72 +{
  73 +       int status = 0;
  74 +       if (ehrpwm_backlight_enable) {
  75 +               platform_device_register(&bbtoys7lcd_backlight);
  76 +       }
  77 +       return status;
  78 +}
  79 +late_initcall(ehrpwm1_init);
  80 +
  81  static int __init conf_disp_pll(int rate)
  82  {
  83         struct clk *disp_pll;
  84 @@ -1250,11 +1285,12 @@ static void lcdc_init(int evm_id, int profile)
  85  }
  86
  87  #define BEAGLEBONE_LCD_AVDD_EN GPIO_TO_PIN(0, 7)
  88 -#define BEAGLEBONE_LCD_BL GPIO_TO_PIN(1, 18)
  89
  90  static void bbtoys7lcd_init(int evm_id, int profile)
  91  {
  92         setup_pin_mux(bbtoys7_pin_mux);
  93 +       gpio_request(BEAGLEBONE_LCD_AVDD_EN, "BONE_LCD_AVDD_EN");
  94 +       gpio_direction_output(BEAGLEBONE_LCD_AVDD_EN, 1);
  95
  96         // we are being stupid and setting pixclock from here instead of da8xx-fb.c
  97         if (conf_disp_pll(300000000)) {
  98 @@ -1265,12 +1301,7 @@ static void bbtoys7lcd_init(int evm_id, int profile)
  99
 100         if (am33xx_register_lcdc(&bbtoys7_pdata))
 101                 pr_info("Failed to register Beagleboardtoys 7\" LCD cape device\n");
 102 -
 103 -       gpio_request(BEAGLEBONE_LCD_BL, "BONE_LCD_BL");
 104 -       gpio_direction_output(BEAGLEBONE_LCD_BL, 1);
 105 -       gpio_request(BEAGLEBONE_LCD_AVDD_EN, "BONE_LCD_AVDD_EN");
 106 -       gpio_direction_output(BEAGLEBONE_LCD_AVDD_EN, 1);
 107 -
 108 +
 109         return;
 110  }
 111
 112 @@ -1831,6 +1862,8 @@ static void beaglebone_cape_setup(struct memory_accessor *mem_acc, void *context
 113                 bbtoys7lcd_init(0,0);
 114                 pr_info("BeagleBone cape: initializing LCD cape touchscreen\n");
 115                 tsc_init(0,0);
 116 +               pr_info("BeagleBone cape: Registering PWM backlight for LCD cape\n");
 117 +               enable_ehrpwm1(0,0);
 118                 beaglebone_tsadcpins_free = 0;
 119         }
 120
 121 --
 122 1.7.9.5
 123