From: Andrew Victor <linux@maxim.org.za>
Date: Sun, 21 Sep 2008 20:31:16 +0000 (+0100)
Subject: [ARM] 5259/2: [AT91] PWM LEDs on AT91SAM9263-EK
X-Git-Tag: firefly_0821_release~17401^2~7^2~7
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a7307bf22557e1e029df0ea6f2a2973de4d9c135;p=firefly-linux-kernel-4.4.55.git

[ARM] 5259/2: [AT91] PWM LEDs on AT91SAM9263-EK

Use the PWM controller and leds-atmel-pwm.c driver to drive a LED on
the Atmel AT91SAM9263-EK board.

Signed-off-by: Sedji Gaouaou <sedji.gaouaou@atmel.com>
Signed-off-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/arch/arm/mach-at91/board-sam9263ek.c b/arch/arm/mach-at91/board-sam9263ek.c
index ad71f4a71451..2924b6884fe2 100644
--- a/arch/arm/mach-at91/board-sam9263ek.c
+++ b/arch/arm/mach-at91/board-sam9263ek.c
@@ -30,6 +30,7 @@
 #include <linux/fb.h>
 #include <linux/gpio_keys.h>
 #include <linux/input.h>
+#include <linux/leds.h>
 
 #include <video/atmel_lcdc.h>
 
@@ -339,25 +340,32 @@ static struct atmel_ac97_data ek_ac97_data = {
  * LEDs ... these could all be PWM-driven, for variable brightness
  */
 static struct gpio_led ek_leds[] = {
-	{	/* "left" led, green, userled1, pwm1 */
-		.name			= "ds1",
-		.gpio			= AT91_PIN_PB8,
-		.active_low		= 1,
-		.default_trigger	= "mmc0",
-	},
-	{	/* "right" led, green, userled2, pwm2 */
+	{	/* "right" led, green, userled2 (could be driven by pwm2) */
 		.name			= "ds2",
 		.gpio			= AT91_PIN_PC29,
 		.active_low		= 1,
 		.default_trigger	= "nand-disk",
 	},
-	{	/* "power" led, yellow, pwm0 */
+	{	/* "power" led, yellow (could be driven by pwm0) */
 		.name			= "ds3",
 		.gpio			= AT91_PIN_PB7,
 		.default_trigger	= "heartbeat",
 	}
 };
 
+/*
+ * PWM Leds
+ */
+static struct gpio_led ek_pwm_led[] = {
+	/* For now only DS1 is PWM-driven (by pwm1) */
+	{
+		.name			= "ds1",
+		.gpio			= 1,	/* is PWM channel number */
+		.active_low		= 1,
+		.default_trigger	= "none",
+	}
+};
+
 
 static void __init ek_board_init(void)
 {
@@ -388,6 +396,7 @@ static void __init ek_board_init(void)
 	at91_add_device_ac97(&ek_ac97_data);
 	/* LEDs */
 	at91_gpio_leds(ek_leds, ARRAY_SIZE(ek_leds));
+	at91_pwm_leds(ek_pwm_led, ARRAY_SIZE(ek_pwm_led));
 }
 
 MACHINE_START(AT91SAM9263EK, "Atmel AT91SAM9263-EK")
diff --git a/arch/arm/mach-at91/include/mach/board.h b/arch/arm/mach-at91/include/mach/board.h
index 9df4608b5f6a..e852609d802f 100644
--- a/arch/arm/mach-at91/include/mach/board.h
+++ b/arch/arm/mach-at91/include/mach/board.h
@@ -175,6 +175,7 @@ extern void __init at91_add_device_isi(void);
  /* LEDs */
 extern void __init at91_init_leds(u8 cpu_led, u8 timer_led);
 extern void __init at91_gpio_leds(struct gpio_led *leds, int nr);
+extern void __init at91_pwm_leds(struct gpio_led *leds, int nr);
 
 /* FIXME: this needs a better location, but gets stuff building again */
 extern int at91_suspend_entering_slow_clock(void);
diff --git a/arch/arm/mach-at91/leds.c b/arch/arm/mach-at91/leds.c
index fec03c59ff94..ff76d59392cc 100644
--- a/arch/arm/mach-at91/leds.c
+++ b/arch/arm/mach-at91/leds.c
@@ -12,6 +12,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/platform_device.h>
 
 #include <mach/board.h>
 #include <mach/gpio.h>
@@ -21,8 +22,6 @@
 
 #if defined(CONFIG_NEW_LEDS)
 
-#include <linux/platform_device.h>
-
 /*
  * New cross-platform LED support.
  */
@@ -55,6 +54,44 @@ void __init at91_gpio_leds(struct gpio_led *leds, int nr) {}
 #endif
 
 
+/* ------------------------------------------------------------------------- */
+
+#if defined (CONFIG_LEDS_ATMEL_PWM)
+
+/*
+ * PWM Leds
+ */
+
+static struct gpio_led_platform_data pwm_led_data;
+
+static struct platform_device at91_pwm_leds = {
+	.name			= "leds-atmel-pwm",
+	.id			= -1,
+	.dev.platform_data	= &pwm_led_data,
+};
+
+void __init at91_pwm_leds(struct gpio_led *leds, int nr)
+{
+	int i;
+	u32 pwm_mask = 0;
+
+	if (!nr)
+		return;
+
+	for (i = 0; i < nr; i++)
+		pwm_mask |= (1 << leds[i].gpio);
+
+	pwm_led_data.leds = leds;
+	pwm_led_data.num_leds = nr;
+
+	at91_add_device_pwm(pwm_mask);
+	platform_device_register(&at91_pwm_leds);
+}
+#else
+void __init at91_pwm_leds(struct gpio_led *leds, int nr){}
+#endif
+
+
 /* ------------------------------------------------------------------------- */
 
 #if defined(CONFIG_LEDS)