T210: P2571: Turn CPU fan on

CPU board (E2530) has a fan - turn it on via GPIO to keep
the SoC cool.

Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>

arch/arm/mach-tegra/board2.c

@@ -60,6 +60,7 @@ __weak void pin_mux_usb(void) {}
 __weak void pin_mux_spi(void) {}
 __weak void gpio_early_init_uart(void) {}
 __weak void pin_mux_display(void) {}
+__weak void start_cpu_fan(void) {}
 
 #if defined(CONFIG_TEGRA_NAND)
 __weak void pin_mux_nand(void)
@@ -230,6 +231,8 @@ int board_late_init(void)
 		setenv("cpu_ns_mode", "");
 	}
 #endif
+	start_cpu_fan();
+
 	return 0;
 }
 

board/nvidia/p2571/p2571.c

@@ -9,6 +9,7 @@
 #include <i2c.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/pinmux.h>
+#include <asm/gpio.h>
 #include "max77620_init.h"
 #include "pinmux-config-p2571.h"
 
@@ -49,3 +50,14 @@ void pinmux_init(void)
 	pinmux_config_drvgrp_table(p2571_drvgrps,
 				   ARRAY_SIZE(p2571_drvgrps));
 }
+
+/*
+ * Routine: start_cpu_fan
+ * Description: Enable/start PWM CPU fan on P2571
+ */
+void start_cpu_fan(void)
+{
+	/* GPIO_PE4 is PS_VDD_FAN_ENABLE */
+	gpio_request(GPIO_PE4, "FAN_VDD");
+	gpio_direction_output(GPIO_PE4, 1);
+}