ARM: ux500: Use the GPIO regulator framework for SDI0's 'en' and 'vsel'

To prevent lots of unnecessary call-backs into platform code, we're
now using the GPIO regulator framework to control the 'enable' (en)
and 'voltage select' (vsel) GPIO pins which in turn control the
MMCI's secondary regulator settings. This already works with Device
Tree, but when booting with ATAGs we need to register it as a
platform device.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 60 insertions, 0 deletions

diff --git a/arch/arm/mach-ux500/board-mop500-regulators.c b/arch/arm/mach-ux500/board-mop500-regulators.c
index 2a17bc506cff..cb7540573a85 100644
--- a/arch/arm/mach-ux500/board-mop500-regulators.c
+++ b/arch/arm/mach-ux500/board-mop500-regulators.c
@@ -28,6 +28,20 @@ struct regulator_init_data gpio_en_3v3_regulator = {
        .consumer_supplies = gpio_en_3v3_consumers,
 };
 
+static struct regulator_consumer_supply sdi0_reg_consumers[] = {
+        REGULATOR_SUPPLY("vqmmc", "sdi0"),
+};
+
+struct regulator_init_data sdi0_reg_init_data = {
+        .constraints = {
+                .min_uV         = 1800000,
+                .max_uV         = 2900000,
+                .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE|REGULATOR_CHANGE_STATUS,
+        },
+        .num_consumer_supplies  = ARRAY_SIZE(sdi0_reg_consumers),
+        .consumer_supplies      = sdi0_reg_consumers,
+};
+
 /*
  * TPS61052 regulator
  */
diff --git a/arch/arm/mach-ux500/board-mop500-regulators.h b/arch/arm/mach-ux500/board-mop500-regulators.h
index 78a0642a2206..0c79d902f904 100644
--- a/arch/arm/mach-ux500/board-mop500-regulators.h
+++ b/arch/arm/mach-ux500/board-mop500-regulators.h
@@ -19,5 +19,6 @@ ab8500_regulator_reg_init[AB8500_NUM_REGULATOR_REGISTERS];
 extern struct regulator_init_data ab8500_regulators[AB8500_NUM_REGULATORS];
 extern struct regulator_init_data tps61052_regulator;
 extern struct regulator_init_data gpio_en_3v3_regulator;
+extern struct regulator_init_data sdi0_reg_init_data;
 
 #endif
diff --git a/arch/arm/mach-ux500/board-mop500.c b/arch/arm/mach-ux500/board-mop500.c
index b03457881c4b..cd100d569f4d 100644
--- a/arch/arm/mach-ux500/board-mop500.c
+++ b/arch/arm/mach-ux500/board-mop500.c
@@ -24,6 +24,8 @@
 #include <linux/mfd/abx500/ab8500.h>
 #include <linux/regulator/ab8500.h>
 #include <linux/regulator/fixed.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/gpio-regulator.h>
 #include <linux/mfd/tc3589x.h>
 #include <linux/mfd/tps6105x.h>
 #include <linux/mfd/abx500/ab8500-gpio.h>
@@ -89,6 +91,37 @@ static struct platform_device snowball_gpio_en_3v3_regulator_dev = {
        },
 };
 
+/* Dynamically populated. */
+static struct gpio sdi0_reg_gpios[] = {
+        { 0, GPIOF_OUT_INIT_LOW, "mmci_vsel" },
+};
+
+static struct gpio_regulator_state sdi0_reg_states[] = {
+        { .value = 2900000, .gpios = (0 << 0) },
+        { .value = 1800000, .gpios = (1 << 0) },
+};
+
+static struct gpio_regulator_config sdi0_reg_info = {
+        .supply_name            = "ext-mmc-level-shifter",
+        .gpios                  = sdi0_reg_gpios,
+        .nr_gpios               = ARRAY_SIZE(sdi0_reg_gpios),
+        .states                 = sdi0_reg_states,
+        .nr_states              = ARRAY_SIZE(sdi0_reg_states),
+        .type                   = REGULATOR_VOLTAGE,
+        .enable_high            = 1,
+        .enabled_at_boot        = 0,
+        .init_data              = &sdi0_reg_init_data,
+        .startup_delay          = 100,
+};
+
+static struct platform_device sdi0_regulator = {
+        .name = "gpio-regulator",
+        .id   = -1,
+        .dev  = {
+                .platform_data = &sdi0_reg_info,
+        },
+};
+
 static struct abx500_gpio_platform_data ab8500_gpio_pdata = {
         .gpio_base              = MOP500_AB8500_PIN_GPIO(1),
 };
@@ -481,6 +514,7 @@ static struct hash_platform_data u8500_hash1_platform_data = {
 /* add any platform devices here - TODO */
 static struct platform_device *mop500_platform_devs[] __initdata = {
         &mop500_gpio_keys_device,
+        &sdi0_regulator,
 };
 
 #ifdef CONFIG_STE_DMA40
@@ -624,6 +658,7 @@ static struct platform_device *snowball_platform_devs[] __initdata = {
         &snowball_gpio_en_3v3_regulator_dev,
         &u8500_thsens_device,
         &u8500_cpufreq_cooling_device,
+        &sdi0_regulator,
 };
 
 static void __init mop500_init_machine(void)
@@ -635,6 +670,9 @@ static void __init mop500_init_machine(void)
         platform_device_register(&db8500_prcmu_device);
         mop500_gpio_keys[0].gpio = GPIO_PROX_SENSOR;
 
+        sdi0_reg_info.enable_gpio = GPIO_SDMMC_EN;
+        sdi0_reg_info.gpios[0].gpio = GPIO_SDMMC_1V8_3V_SEL;
+
         mop500_pinmaps_init();
         parent = u8500_init_devices(&ab8500_platdata);
 
@@ -668,6 +706,10 @@ static void __init snowball_init_machine(void)
         int i;
 
         platform_device_register(&db8500_prcmu_device);
+
+        sdi0_reg_info.enable_gpio = SNOWBALL_SDMMC_EN_GPIO;
+        sdi0_reg_info.gpios[0].gpio = SNOWBALL_SDMMC_1V8_3V_GPIO;
+
         snowball_pinmaps_init();
         parent = u8500_init_devices(&ab8500_platdata);
 
@@ -701,6 +743,9 @@ static void __init hrefv60_init_machine(void)
          */
         mop500_gpio_keys[0].gpio = HREFV60_PROX_SENSE_GPIO;
 
+        sdi0_reg_info.enable_gpio = HREFV60_SDMMC_EN_GPIO;
+        sdi0_reg_info.gpios[0].gpio = HREFV60_SDMMC_1V8_3V_GPIO;
+
         hrefv60_pinmaps_init();
         parent = u8500_init_devices(&ab8500_platdata);