ARM: shmobile: armadillo800eva: Add backlight support

The flat panel backlight on the Armadillo 800 EVA board is driven by the
TPU PWM output.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/arch/arm/mach-shmobile/board-armadillo800eva.c b/arch/arm/mach-shmobile/board-armadillo800eva.c
index e115f67..9457c76 100644 (file)
--- a/arch/arm/mach-shmobile/board-armadillo800eva.c
+++ b/arch/arm/mach-shmobile/board-armadillo800eva.c
@@ -31,6 +31,8 @@
 #include <linux/gpio_keys.h>
 #include <linux/regulator/driver.h>
 #include <linux/pinctrl/machine.h>
+#include <linux/platform_data/pwm-renesas-tpu.h>
+#include <linux/pwm_backlight.h>
 #include <linux/regulator/fixed.h>
 #include <linux/regulator/gpio-regulator.h>
 #include <linux/regulator/machine.h>
@@ -387,7 +389,50 @@ static struct platform_device sh_eth_device = {
        .num_resources = ARRAY_SIZE(sh_eth_resources),
 };
 
-/* LCDC */
+/* PWM */
+static struct resource pwm_resources[] = {
+       [0] = {
+               .start = 0xe6600000,
+               .end = 0xe66000ff,
+               .flags = IORESOURCE_MEM,
+       },
+};
+
+static struct tpu_pwm_platform_data pwm_device_data = {
+       .channels[2] = {
+               .polarity = PWM_POLARITY_INVERSED,
+       }
+};
+
+static struct platform_device pwm_device = {
+       .name = "renesas-tpu-pwm",
+       .id = -1,
+       .dev = {
+               .platform_data = &pwm_device_data,
+       },
+       .num_resources = ARRAY_SIZE(pwm_resources),
+       .resource = pwm_resources,
+};
+
+static struct pwm_lookup pwm_lookup[] = {
+       PWM_LOOKUP("renesas-tpu-pwm", 2, "pwm-backlight.0", NULL),
+};
+
+/* LCDC and backlight */
+static struct platform_pwm_backlight_data pwm_backlight_data = {
+       .lth_brightness = 50,
+       .max_brightness = 255,
+       .dft_brightness = 255,
+       .pwm_period_ns = 33333, /* 30kHz */
+};
+
+static struct platform_device pwm_backlight_device = {
+       .name = "pwm-backlight",
+       .dev = {
+               .platform_data = &pwm_backlight_data,
+       },
+};
+
 static struct fb_videomode lcdc0_mode = {
        .name           = "AMPIER/AM-800480",
        .xres           = 800,
@@ -1030,6 +1075,8 @@ static struct i2c_board_info i2c2_devices[] = {
  */
 static struct platform_device *eva_devices[] __initdata = {
        &lcdc0_device,
+       &pwm_device,
+       &pwm_backlight_device,
        &gpio_keys_device,
        &sh_eth_device,
        &vcc_sdhi0,
@@ -1101,6 +1148,9 @@ static const struct pinctrl_map eva_pinctrl_map[] = {
        /* ST1232 */
        PIN_MAP_MUX_GROUP_DEFAULT("0-0055", "pfc-r8a7740",
                                  "intc_irq10", "intc"),
+       /* TPU0 */
+       PIN_MAP_MUX_GROUP_DEFAULT("renesas-tpu-pwm", "pfc-r8a7740",
+                                 "tpu0_to2_1", "tpu0"),
        /* USBHS */
        PIN_MAP_MUX_GROUP_DEFAULT("renesas_usbhs", "pfc-r8a7740",
                                  "intc_irq7_1", "intc"),
@@ -1154,13 +1204,13 @@ static void __init eva_init(void)
                                     ARRAY_SIZE(fixed3v3_power_consumers), 3300000);
 
        pinctrl_register_mappings(eva_pinctrl_map, ARRAY_SIZE(eva_pinctrl_map));
+       pwm_add_table(pwm_lookup, ARRAY_SIZE(pwm_lookup));
 
        r8a7740_pinmux_init();
        r8a7740_meram_workaround();
 
        /* LCDC0 */
        gpio_request_one(61, GPIOF_OUT_INIT_HIGH, NULL); /* LCDDON */
-       gpio_request_one(202, GPIOF_OUT_INIT_LOW, NULL); /* LCD0_LED_CONT */
 
        /* Touchscreen */
        gpio_request_one(166, GPIOF_OUT_INIT_HIGH, NULL); /* TP_RST_B */