ARM: 6163/1: at91sam9g20ek: add fixed-value regulator for wm8731

If CONFIG_REGULATOR is enabled, wm8731 fails on AT91SAM9G20EK board,
since codec driver requires several voltage supplies and none are
provided currently. As requires voltages are hardwired to 3V3, use fixed
voltage regulator for this chip.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Acked-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-at91/board-sam9g20ek-2slot-mmc.c

@@ -26,6 +26,9 @@
 #include <linux/spi/spi.h>
 #include <linux/spi/at73c213.h>
 #include <linux/clk.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/fixed.h>
+#include <linux/regulator/consumer.h>
 
 #include <mach/hardware.h>
 #include <asm/setup.h>
@@ -235,6 +238,46 @@ static struct gpio_led ek_leds[] = {
 	}
 };
 
+#if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
+static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
+	REGULATOR_SUPPLY("AVDD", "0-001b"),
+	REGULATOR_SUPPLY("HPVDD", "0-001b"),
+	REGULATOR_SUPPLY("DBVDD", "0-001b"),
+	REGULATOR_SUPPLY("DCVDD", "0-001b"),
+};
+
+static struct regulator_init_data ek_avdd_reg_init_data = {
+	.constraints	= {
+		.name	= "3V3",
+		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
+	},
+	.consumer_supplies = ek_audio_consumer_supplies,
+	.num_consumer_supplies = ARRAY_SIZE(ek_audio_consumer_supplies),
+};
+
+static struct fixed_voltage_config ek_vdd_pdata = {
+	.supply_name	= "board-3V3",
+	.microvolts	= 3300000,
+	.gpio		= -EINVAL,
+	.enabled_at_boot = 0,
+	.init_data	= &ek_avdd_reg_init_data,
+};
+static struct platform_device ek_voltage_regulator = {
+	.name		= "reg-fixed-voltage",
+	.id		= -1,
+	.num_resources	= 0,
+	.dev		= {
+		.platform_data	= &ek_vdd_pdata,
+	},
+};
+static void __init ek_add_regulators(void)
+{
+	platform_device_register(&ek_voltage_regulator);
+}
+#else
+static void __init ek_add_regulators(void) {}
+#endif
+
 static struct i2c_board_info __initdata ek_i2c_devices[] = {
 	{
 		I2C_BOARD_INFO("24c512", 0x50),
@@ -256,6 +299,8 @@ static void __init ek_board_init(void)
 	ek_add_device_nand();
 	/* Ethernet */
 	at91_add_device_eth(&ek_macb_data);
+	/* Regulators */
+	ek_add_regulators();
 	/* MMC */
 #if defined(CONFIG_MMC_ATMELMCI) || defined(CONFIG_MMC_ATMELMCI_MODULE)
 	at91_add_device_mci(0, &ek_mmc_data);