arm: tegra: enterprise: Add support to externel pwm.

Bug 995402

Change-Id: I53e9f1801d3b37626abb89c67b4e63662dab8c65
Reviewed-on: http://git-master/r/111306
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>

4 files changed, 41 insertions, 2 deletions

diff --git a/arch/arm/mach-tegra/board-enterprise-panel.c b/arch/arm/mach-tegra/board-enterprise-panel.c
index 97a2294e6f5b..9561e5ad0406 100644
--- a/arch/arm/mach-tegra/board-enterprise-panel.c
+++ b/arch/arm/mach-tegra/board-enterprise-panel.c
@@ -26,6 +26,7 @@
 #include <linux/platform_device.h>
 #include <linux/earlysuspend.h>
 #include <linux/tegra_pwm_bl.h>
+#include <linux/pwm_backlight.h>
 #include <asm/atomic.h>
 #include <linux/nvhost.h>
 #include <linux/nvmap.h>
@@ -62,6 +63,8 @@
 
 #define enterprise_lcd_te		TEGRA_GPIO_PJ1
 
+#define enterprise_bl_pwm		TEGRA_GPIO_PH3
+
 #ifdef CONFIG_TEGRA_DC
 static struct regulator *enterprise_dsi_reg;
 static bool dsi_regulator_status;
@@ -166,6 +169,17 @@ static int enterprise_backlight_notify(struct device *unused, int brightness)
 
 static int enterprise_disp1_check_fb(struct device *dev, struct fb_info *info);
 
+#if IS_EXTERNAL_PWM
+static struct platform_pwm_backlight_data enterprise_disp1_backlight_data = {
+	.pwm_id		= 3,
+	.max_brightness	= 255,
+	.dft_brightness	= 224,
+	.pwm_period_ns	= 1000000,
+	.notify		= enterprise_backlight_notify,
+	/* Only toggle backlight on fb blank notifications for disp1 */
+	.check_fb	= enterprise_disp1_check_fb,
+};
+#else
 /*
  * In case which_pwm is TEGRA_PWM_PM0,
  * gpio_conf_to_sfio should be TEGRA_GPIO_PW0: set LCD_CS1_N pin to SFIO
@@ -186,9 +200,15 @@ static struct platform_tegra_pwm_backlight_data enterprise_disp1_backlight_data
 	/* Only toggle backlight on fb blank notifications for disp1 */
 	.check_fb	= enterprise_disp1_check_fb,
 };
+#endif
+
 
 static struct platform_device enterprise_disp1_backlight_device = {
+#if IS_EXTERNAL_PWM
+	.name	= "pwm-backlight",
+#else
 	.name	= "tegra-pwm-bl",
+#endif
 	.id	= -1,
 	.dev	= {
 		.platform_data = &enterprise_disp1_backlight_data,
@@ -511,8 +531,11 @@ static int enterprise_dsi_panel_enable(void)
 	if (ret)
 		return ret;
 
-#if DSI_PANEL_RESET
+#if IS_EXTERNAL_PWM
+	tegra_gpio_disable(enterprise_bl_pwm);
+#endif
 
+#if DSI_PANEL_RESET
 	if (board_info.fab >= BOARD_FAB_A03) {
 		if (enterprise_lcd_reg == NULL) {
 			enterprise_lcd_reg = regulator_get(NULL, "lcd_vddio_en");
@@ -795,7 +818,11 @@ static struct platform_device *enterprise_gfx_devices[] __initdata = {
 #if defined(CONFIG_TEGRA_NVMAP)
 	&enterprise_nvmap_device,
 #endif
+#if IS_EXTERNAL_PWM
+	&tegra_pwfm3_device,
+#else
 	&tegra_pwfm0_device,
+#endif
 };
 
 static struct platform_device *enterprise_bl_devices[]  = {
@@ -846,7 +873,9 @@ int __init enterprise_panel_init(void)
 	BUILD_BUG_ON(ARRAY_SIZE(enterprise_bl_output_measured_a02) != 256);
 
 	if (board_info.fab >= BOARD_FAB_A03) {
+#if !(IS_EXTERNAL_PWM)
 		enterprise_disp1_backlight_data.clk_div = 0x1D;
+#endif
 		bl_output = enterprise_bl_output_measured_a03;
 	} else
 		bl_output = enterprise_bl_output_measured_a02;
diff --git a/arch/arm/mach-tegra/board-enterprise-pinmux.c b/arch/arm/mach-tegra/board-enterprise-pinmux.c
index e64d65b84153..721eb0d27576 100644
--- a/arch/arm/mach-tegra/board-enterprise-pinmux.c
+++ b/arch/arm/mach-tegra/board-enterprise-pinmux.c
@@ -265,6 +265,9 @@ static __initdata struct tegra_pingroup_config enterprise_pinmux_common[] = {
 	DEFAULT_PINMUX(GMI_AD8,         PWM0,            NORMAL,    NORMAL,     OUTPUT),
 	DEFAULT_PINMUX(GMI_AD9,         NAND,            NORMAL,    NORMAL,     OUTPUT),
 	DEFAULT_PINMUX(GMI_AD10,        NAND,            NORMAL,    NORMAL,     OUTPUT),
+#if IS_EXTERNAL_PWM
+	DEFAULT_PINMUX(GMI_AD11,        PWM3,            NORMAL,    NORMAL,	OUTPUT),
+#endif
 	DEFAULT_PINMUX(GMI_A16,         UARTD,           NORMAL,    NORMAL,     OUTPUT),
 	DEFAULT_PINMUX(GMI_A17,         UARTD,           NORMAL,    NORMAL,     INPUT),
 	DEFAULT_PINMUX(GMI_A18,         UARTD,           NORMAL,    NORMAL,     INPUT),
@@ -379,7 +382,9 @@ static __initdata struct tegra_pingroup_config enterprise_unused_pinmux_common[]
 	DEFAULT_PINMUX(GMI_AD5,         GMI,             NORMAL,       TRISTATE,  OUTPUT),
 	DEFAULT_PINMUX(GMI_AD6,         GMI,             NORMAL,       TRISTATE,  OUTPUT),
 	DEFAULT_PINMUX(GMI_AD7,         GMI,             NORMAL,       TRISTATE,  OUTPUT),
+#if !(IS_EXTERNAL_PWM)
 	DEFAULT_PINMUX(GMI_AD11,        GMI,             PULL_DOWN,    TRISTATE,  OUTPUT),
+#endif
 	DEFAULT_PINMUX(GMI_CS0_N,       GMI,             PULL_DOWN,    TRISTATE,  OUTPUT),
 	DEFAULT_PINMUX(GMI_CS2_N,       GMI,             PULL_DOWN,    TRISTATE,  OUTPUT),
 	DEFAULT_PINMUX(GMI_CS3_N,       GMI,             PULL_DOWN,    TRISTATE,  OUTPUT),
@@ -460,7 +465,9 @@ static __initdata struct pin_info_low_power_mode enterprise_unused_gpio_pins_com
 	PIN_GPIO_LPM("GMI_AD5",      TEGRA_GPIO_PG5,  0, 0),
 	PIN_GPIO_LPM("GMI_AD6",      TEGRA_GPIO_PG6,  0, 0),
 	PIN_GPIO_LPM("GMI_AD7",      TEGRA_GPIO_PG7,  0, 0),
+#if !(IS_EXTERNAL_PWM)
 	PIN_GPIO_LPM("GMI_AD11",     TEGRA_GPIO_PH3,  0, 0),
+#endif
 	PIN_GPIO_LPM("GMI_CS0_N",    TEGRA_GPIO_PJ0,  0, 0),
 	PIN_GPIO_LPM("GMI_CS2_N",    TEGRA_GPIO_PK3,  0, 0),
 	PIN_GPIO_LPM("GMI_CS3_N",    TEGRA_GPIO_PK4,  0, 0),
diff --git a/arch/arm/mach-tegra/board-enterprise.c b/arch/arm/mach-tegra/board-enterprise.c
index 06acb18f68db..2bf5356f512a 100644
--- a/arch/arm/mach-tegra/board-enterprise.c
+++ b/arch/arm/mach-tegra/board-enterprise.c
@@ -136,7 +136,7 @@ static __initdata struct tegra_clk_init_table enterprise_clk_init_table[] = {
 	{ "pll_m",	NULL,		0,		false},
 	{ "hda",	"pll_p",	108000000,	false},
 	{ "hda2codec_2x","pll_p",	48000000,	false},
-	{ "pwm",	"clk_32k",	32768,		false},
+	{ "pwm",	"pll_p",	3187500,	false},
 	{ "blink",	"clk_32k",	32768,		true},
 	{ "i2s0",	"pll_a_out0",	0,		false},
 	{ "i2s1",	"pll_a_out0",	0,		false},
diff --git a/arch/arm/mach-tegra/board-enterprise.h b/arch/arm/mach-tegra/board-enterprise.h
index f47672091bf8..3c6d149abdff 100644
--- a/arch/arm/mach-tegra/board-enterprise.h
+++ b/arch/arm/mach-tegra/board-enterprise.h
@@ -158,4 +158,7 @@ enum tegra_bb_type {
 	TEGRA_BB_M7400,
 };
 
+/* Indicate the pwm of backlight, DC pwm or external pwm3. */
+#define IS_EXTERNAL_PWM		0
+
 #endif /*_MACH_TEGRA_BOARD_ENTERPRISE_H */