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From 46c7fc0ed1ad0e5da431d15a4333a4fb5bb0ff0e Mon Sep 17 00:00:00 2001
From: Koen Kooi <koen@dominion.thruhere.net>
Date: Tue, 31 Jan 2012 17:02:10 +0100
Subject: [PATCH 15/26] beaglebone: enable PWM for lcd backlight <- backlight
is inverted
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
---
arch/arm/mach-omap2/board-am335xevm.c | 51 +++++++++++++++++++++++++++------
1 file changed, 42 insertions(+), 9 deletions(-)
diff --git a/arch/arm/mach-omap2/board-am335xevm.c b/arch/arm/mach-omap2/board-am335xevm.c
index 3c67e94..23b59c2 100644
--- a/arch/arm/mach-omap2/board-am335xevm.c
+++ b/arch/arm/mach-omap2/board-am335xevm.c
@@ -179,6 +179,16 @@ static const struct display_panel bbtoys7_panel = {
COLOR_ACTIVE,
};
+#define BBTOYS7LCD_PWM_DEVICE_ID "ehrpwm.1:0"
+
+static struct platform_pwm_backlight_data bbtoys7lcd_backlight_data = {
+ .pwm_id = BBTOYS7LCD_PWM_DEVICE_ID,
+ .ch = -1,
+ .max_brightness = AM335X_BACKLIGHT_MAX_BRIGHTNESS,
+ .dft_brightness = AM335X_BACKLIGHT_DEFAULT_BRIGHTNESS,
+ .pwm_period_ns = AM335X_PWM_PERIOD_NANO_SECONDS,
+};
+
static struct lcd_ctrl_config bbtoys7_cfg = {
&bbtoys7_panel,
.ac_bias = 255,
@@ -599,9 +609,9 @@ static struct pinmux_config bbtoys7_pin_mux[] = {
{"lcd_vsync.lcd_vsync", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
{"lcd_hsync.lcd_hsync", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
{"lcd_pclk.lcd_pclk", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
- {"lcd_ac_bias_en.lcd_ac_bias_en", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
- {"gpmc_a2.gpio1_18", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT}, // Backlight
+ {"lcd_ac_bias_en.lcd_ac_bias_en", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
{"ecap0_in_pwm0_out.gpio0_7", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT}, // AVDD_EN
+ {"gpmc_a2.ehrpwm1A", OMAP_MUX_MODE6 | AM33XX_PIN_OUTPUT}, // Backlight
{NULL, 0},
};
@@ -1134,6 +1144,7 @@ static struct pinmux_config ecap0_pin_mux[] = {
{NULL, 0},
};
+static int ehrpwm_backlight_enable;
static int backlight_enable;
#define AM335XEVM_WLAN_PMENA_GPIO GPIO_TO_PIN(1, 30)
@@ -1216,6 +1227,30 @@ static int __init ecap0_init(void)
}
late_initcall(ecap0_init);
+static void enable_ehrpwm1(int evm_id, int profile)
+{
+ ehrpwm_backlight_enable = true;
+}
+
+/* Setup pwm-backlight for bbtoys7lcd */
+static struct platform_device bbtoys7lcd_backlight = {
+ .name = "pwm-backlight",
+ .id = -1,
+ .dev = {
+ .platform_data = &bbtoys7lcd_backlight_data,
+ }
+};
+
+static int __init ehrpwm1_init(void)
+{
+ int status = 0;
+ if (ehrpwm_backlight_enable) {
+ platform_device_register(&bbtoys7lcd_backlight);
+ }
+ return status;
+}
+late_initcall(ehrpwm1_init);
+
static int __init conf_disp_pll(int rate)
{
struct clk *disp_pll;
@@ -1250,11 +1285,12 @@ static void lcdc_init(int evm_id, int profile)
}
#define BEAGLEBONE_LCD_AVDD_EN GPIO_TO_PIN(0, 7)
-#define BEAGLEBONE_LCD_BL GPIO_TO_PIN(1, 18)
static void bbtoys7lcd_init(int evm_id, int profile)
{
setup_pin_mux(bbtoys7_pin_mux);
+ gpio_request(BEAGLEBONE_LCD_AVDD_EN, "BONE_LCD_AVDD_EN");
+ gpio_direction_output(BEAGLEBONE_LCD_AVDD_EN, 1);
// we are being stupid and setting pixclock from here instead of da8xx-fb.c
if (conf_disp_pll(300000000)) {
@@ -1265,12 +1301,7 @@ static void bbtoys7lcd_init(int evm_id, int profile)
if (am33xx_register_lcdc(&bbtoys7_pdata))
pr_info("Failed to register Beagleboardtoys 7\" LCD cape device\n");
-
- gpio_request(BEAGLEBONE_LCD_BL, "BONE_LCD_BL");
- gpio_direction_output(BEAGLEBONE_LCD_BL, 1);
- gpio_request(BEAGLEBONE_LCD_AVDD_EN, "BONE_LCD_AVDD_EN");
- gpio_direction_output(BEAGLEBONE_LCD_AVDD_EN, 1);
-
+
return;
}
@@ -1831,6 +1862,8 @@ static void beaglebone_cape_setup(struct memory_accessor *mem_acc, void *context
bbtoys7lcd_init(0,0);
pr_info("BeagleBone cape: initializing LCD cape touchscreen\n");
tsc_init(0,0);
+ pr_info("BeagleBone cape: Registering PWM backlight for LCD cape\n");
+ enable_ehrpwm1(0,0);
beaglebone_tsadcpins_free = 0;
}
--
1.7.9.5
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