From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/regulator/wm831x-dcdc.c | 854 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 854 insertions(+)
 create mode 100644 drivers/regulator/wm831x-dcdc.c

(limited to 'drivers/regulator/wm831x-dcdc.c')

diff --git a/drivers/regulator/wm831x-dcdc.c b/drivers/regulator/wm831x-dcdc.c
new file mode 100644
index 000000000..e43ed4d93
--- /dev/null
+++ b/drivers/regulator/wm831x-dcdc.c
@@ -0,0 +1,854 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// wm831x-dcdc.c  --  DC-DC buck converter driver for the WM831x series
+//
+// Copyright 2009 Wolfson Microelectronics PLC.
+//
+// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/gpio/consumer.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/wm831x/core.h>
+#include <linux/mfd/wm831x/regulator.h>
+#include <linux/mfd/wm831x/pdata.h>
+
+#define WM831X_BUCKV_MAX_SELECTOR 0x68
+#define WM831X_BUCKP_MAX_SELECTOR 0x66
+
+#define WM831X_DCDC_MODE_FAST    0
+#define WM831X_DCDC_MODE_NORMAL  1
+#define WM831X_DCDC_MODE_IDLE    2
+#define WM831X_DCDC_MODE_STANDBY 3
+
+#define WM831X_DCDC_MAX_NAME 9
+
+/* Register offsets in control block */
+#define WM831X_DCDC_CONTROL_1     0
+#define WM831X_DCDC_CONTROL_2     1
+#define WM831X_DCDC_ON_CONFIG     2
+#define WM831X_DCDC_SLEEP_CONTROL 3
+#define WM831X_DCDC_DVS_CONTROL   4
+
+/*
+ * Shared
+ */
+
+struct wm831x_dcdc {
+	char name[WM831X_DCDC_MAX_NAME];
+	char supply_name[WM831X_DCDC_MAX_NAME];
+	struct regulator_desc desc;
+	int base;
+	struct wm831x *wm831x;
+	struct regulator_dev *regulator;
+	struct gpio_desc *dvs_gpiod;
+	int dvs_gpio_state;
+	int on_vsel;
+	int dvs_vsel;
+};
+
+static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
+
+{
+	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+	struct wm831x *wm831x = dcdc->wm831x;
+	u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
+	int val;
+
+	val = wm831x_reg_read(wm831x, reg);
+	if (val < 0)
+		return val;
+
+	val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
+
+	switch (val) {
+	case WM831X_DCDC_MODE_FAST:
+		return REGULATOR_MODE_FAST;
+	case WM831X_DCDC_MODE_NORMAL:
+		return REGULATOR_MODE_NORMAL;
+	case WM831X_DCDC_MODE_STANDBY:
+		return REGULATOR_MODE_STANDBY;
+	case WM831X_DCDC_MODE_IDLE:
+		return REGULATOR_MODE_IDLE;
+	default:
+		BUG();
+		return -EINVAL;
+	}
+}
+
+static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
+				    unsigned int mode)
+{
+	int val;
+
+	switch (mode) {
+	case REGULATOR_MODE_FAST:
+		val = WM831X_DCDC_MODE_FAST;
+		break;
+	case REGULATOR_MODE_NORMAL:
+		val = WM831X_DCDC_MODE_NORMAL;
+		break;
+	case REGULATOR_MODE_STANDBY:
+		val = WM831X_DCDC_MODE_STANDBY;
+		break;
+	case REGULATOR_MODE_IDLE:
+		val = WM831X_DCDC_MODE_IDLE;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
+			       val << WM831X_DC1_ON_MODE_SHIFT);
+}
+
+static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+	struct wm831x *wm831x = dcdc->wm831x;
+	u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
+
+	return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
+}
+
+static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
+					unsigned int mode)
+{
+	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+	struct wm831x *wm831x = dcdc->wm831x;
+	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
+
+	return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
+}
+
+static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
+{
+	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+	struct wm831x *wm831x = dcdc->wm831x;
+	int ret;
+
+	/* First, check for errors */
+	ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
+	if (ret < 0)
+		return ret;
+
+	if (ret & (1 << rdev_get_id(rdev))) {
+		dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
+			rdev_get_id(rdev) + 1);
+		return REGULATOR_STATUS_ERROR;
+	}
+
+	/* DCDC1 and DCDC2 can additionally detect high voltage/current */
+	if (rdev_get_id(rdev) < 2) {
+		if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
+			dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
+				rdev_get_id(rdev) + 1);
+			return REGULATOR_STATUS_ERROR;
+		}
+
+		if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
+			dev_dbg(wm831x->dev, "DCDC%d over current\n",
+				rdev_get_id(rdev) + 1);
+			return REGULATOR_STATUS_ERROR;
+		}
+	}
+
+	/* Is the regulator on? */
+	ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
+	if (ret < 0)
+		return ret;
+	if (!(ret & (1 << rdev_get_id(rdev))))
+		return REGULATOR_STATUS_OFF;
+
+	/* TODO: When we handle hardware control modes so we can report the
+	 * current mode. */
+	return REGULATOR_STATUS_ON;
+}
+
+static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
+{
+	struct wm831x_dcdc *dcdc = data;
+
+	regulator_notifier_call_chain(dcdc->regulator,
+				      REGULATOR_EVENT_UNDER_VOLTAGE,
+				      NULL);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
+{
+	struct wm831x_dcdc *dcdc = data;
+
+	regulator_notifier_call_chain(dcdc->regulator,
+				      REGULATOR_EVENT_OVER_CURRENT,
+				      NULL);
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * BUCKV specifics
+ */
+
+static const struct linear_range wm831x_buckv_ranges[] = {
+	REGULATOR_LINEAR_RANGE(600000, 0, 0x7, 0),
+	REGULATOR_LINEAR_RANGE(600000, 0x8, 0x68, 12500),
+};
+
+static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
+{
+	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+
+	if (state == dcdc->dvs_gpio_state)
+		return 0;
+
+	dcdc->dvs_gpio_state = state;
+	gpiod_set_value(dcdc->dvs_gpiod, state);
+
+	/* Should wait for DVS state change to be asserted if we have
+	 * a GPIO for it, for now assume the device is configured
+	 * for the fastest possible transition.
+	 */
+
+	return 0;
+}
+
+static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev,
+					unsigned vsel)
+{
+	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+	struct wm831x *wm831x = dcdc->wm831x;
+	int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
+	int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
+	int ret;
+
+	/* If this value is already set then do a GPIO update if we can */
+	if (dcdc->dvs_gpiod && dcdc->on_vsel == vsel)
+		return wm831x_buckv_set_dvs(rdev, 0);
+
+	if (dcdc->dvs_gpiod && dcdc->dvs_vsel == vsel)
+		return wm831x_buckv_set_dvs(rdev, 1);
+
+	/* Always set the ON status to the minimum voltage */
+	ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
+	if (ret < 0)
+		return ret;
+	dcdc->on_vsel = vsel;
+
+	if (!dcdc->dvs_gpiod)
+		return ret;
+
+	/* Kick the voltage transition now */
+	ret = wm831x_buckv_set_dvs(rdev, 0);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * If this VSEL is higher than the last one we've seen then
+	 * remember it as the DVS VSEL.  This is optimised for CPUfreq
+	 * usage where we want to get to the highest voltage very
+	 * quickly.
+	 */
+	if (vsel > dcdc->dvs_vsel) {
+		ret = wm831x_set_bits(wm831x, dvs_reg,
+				      WM831X_DC1_DVS_VSEL_MASK,
+				      vsel);
+		if (ret == 0)
+			dcdc->dvs_vsel = vsel;
+		else
+			dev_warn(wm831x->dev,
+				 "Failed to set DCDC DVS VSEL: %d\n", ret);
+	}
+
+	return 0;
+}
+
+static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
+					    int uV)
+{
+	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+	struct wm831x *wm831x = dcdc->wm831x;
+	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
+	int vsel;
+
+	vsel = regulator_map_voltage_linear_range(rdev, uV, uV);
+	if (vsel < 0)
+		return vsel;
+
+	return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
+}
+
+static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
+{
+	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+
+	if (dcdc->dvs_gpiod && dcdc->dvs_gpio_state)
+		return dcdc->dvs_vsel;
+	else
+		return dcdc->on_vsel;
+}
+
+/* Current limit options */
+static const unsigned int wm831x_dcdc_ilim[] = {
+	125000, 250000, 375000, 500000, 625000, 750000, 875000, 1000000
+};
+
+static const struct regulator_ops wm831x_buckv_ops = {
+	.set_voltage_sel = wm831x_buckv_set_voltage_sel,
+	.get_voltage_sel = wm831x_buckv_get_voltage_sel,
+	.list_voltage = regulator_list_voltage_linear_range,
+	.map_voltage = regulator_map_voltage_linear_range,
+	.set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
+	.set_current_limit = regulator_set_current_limit_regmap,
+	.get_current_limit = regulator_get_current_limit_regmap,
+
+	.is_enabled = regulator_is_enabled_regmap,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.get_status = wm831x_dcdc_get_status,
+	.get_mode = wm831x_dcdc_get_mode,
+	.set_mode = wm831x_dcdc_set_mode,
+	.set_suspend_mode = wm831x_dcdc_set_suspend_mode,
+};
+
+/*
+ * Set up DVS control.  We just log errors since we can still run
+ * (with reduced performance) if we fail.
+ */
+static void wm831x_buckv_dvs_init(struct platform_device *pdev,
+				  struct wm831x_dcdc *dcdc,
+				  struct wm831x_buckv_pdata *pdata)
+{
+	struct wm831x *wm831x = dcdc->wm831x;
+	int ret;
+	u16 ctrl;
+
+	if (!pdata)
+		return;
+
+	/* gpiolib won't let us read the GPIO status so pick the higher
+	 * of the two existing voltages so we take it as platform data.
+	 */
+	dcdc->dvs_gpio_state = pdata->dvs_init_state;
+
+	dcdc->dvs_gpiod = devm_gpiod_get(&pdev->dev, "dvs",
+			dcdc->dvs_gpio_state ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW);
+	if (IS_ERR(dcdc->dvs_gpiod)) {
+		dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %ld\n",
+			dcdc->name, PTR_ERR(dcdc->dvs_gpiod));
+		return;
+	}
+
+	switch (pdata->dvs_control_src) {
+	case 1:
+		ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
+		break;
+	case 2:
+		ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
+		break;
+	default:
+		dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
+			pdata->dvs_control_src, dcdc->name);
+		return;
+	}
+
+	/* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
+	 * to make bootstrapping a bit smoother.
+	 */
+	if (!dcdc->dvs_vsel) {
+		ret = wm831x_set_bits(wm831x,
+				      dcdc->base + WM831X_DCDC_DVS_CONTROL,
+				      WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
+		if (ret == 0)
+			dcdc->dvs_vsel = dcdc->on_vsel;
+		else
+			dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
+				 ret);
+	}
+
+	ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
+			      WM831X_DC1_DVS_SRC_MASK, ctrl);
+	if (ret < 0) {
+		dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
+			dcdc->name, ret);
+	}
+}
+
+static int wm831x_buckv_probe(struct platform_device *pdev)
+{
+	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
+	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
+	struct regulator_config config = { };
+	int id;
+	struct wm831x_dcdc *dcdc;
+	struct resource *res;
+	int ret, irq;
+
+	if (pdata && pdata->wm831x_num)
+		id = (pdata->wm831x_num * 10) + 1;
+	else
+		id = 0;
+	id = pdev->id - id;
+
+	dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
+
+	dcdc = devm_kzalloc(&pdev->dev,  sizeof(struct wm831x_dcdc),
+			    GFP_KERNEL);
+	if (!dcdc)
+		return -ENOMEM;
+
+	dcdc->wm831x = wm831x;
+
+	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "No REG resource\n");
+		ret = -EINVAL;
+		goto err;
+	}
+	dcdc->base = res->start;
+
+	snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
+	dcdc->desc.name = dcdc->name;
+
+	snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
+		 "DC%dVDD", id + 1);
+	dcdc->desc.supply_name = dcdc->supply_name;
+
+	dcdc->desc.id = id;
+	dcdc->desc.type = REGULATOR_VOLTAGE;
+	dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
+	dcdc->desc.linear_ranges = wm831x_buckv_ranges;
+	dcdc->desc.n_linear_ranges = ARRAY_SIZE(wm831x_buckv_ranges);
+	dcdc->desc.ops = &wm831x_buckv_ops;
+	dcdc->desc.owner = THIS_MODULE;
+	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
+	dcdc->desc.enable_mask = 1 << id;
+	dcdc->desc.csel_reg = dcdc->base + WM831X_DCDC_CONTROL_2;
+	dcdc->desc.csel_mask = WM831X_DC1_HC_THR_MASK;
+	dcdc->desc.n_current_limits = ARRAY_SIZE(wm831x_dcdc_ilim);
+	dcdc->desc.curr_table = wm831x_dcdc_ilim;
+
+	ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
+	if (ret < 0) {
+		dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
+		goto err;
+	}
+	dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
+
+	ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
+	if (ret < 0) {
+		dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
+		goto err;
+	}
+	dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
+
+	if (pdata && pdata->dcdc[id])
+		wm831x_buckv_dvs_init(pdev, dcdc,
+				      pdata->dcdc[id]->driver_data);
+
+	config.dev = pdev->dev.parent;
+	if (pdata)
+		config.init_data = pdata->dcdc[id];
+	config.driver_data = dcdc;
+	config.regmap = wm831x->regmap;
+
+	dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
+						  &config);
+	if (IS_ERR(dcdc->regulator)) {
+		ret = PTR_ERR(dcdc->regulator);
+		dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
+			id + 1, ret);
+		goto err;
+	}
+
+	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
+	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+					wm831x_dcdc_uv_irq,
+					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+					dcdc->name, dcdc);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
+			irq, ret);
+		goto err;
+	}
+
+	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
+	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+					wm831x_dcdc_oc_irq,
+					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+					dcdc->name, dcdc);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
+			irq, ret);
+		goto err;
+	}
+
+	platform_set_drvdata(pdev, dcdc);
+
+	return 0;
+
+err:
+	return ret;
+}
+
+static struct platform_driver wm831x_buckv_driver = {
+	.probe = wm831x_buckv_probe,
+	.driver		= {
+		.name	= "wm831x-buckv",
+	},
+};
+
+/*
+ * BUCKP specifics
+ */
+
+static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
+{
+	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+	struct wm831x *wm831x = dcdc->wm831x;
+	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
+	int sel;
+
+	sel = regulator_map_voltage_linear(rdev, uV, uV);
+	if (sel < 0)
+		return sel;
+
+	return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
+}
+
+static const struct regulator_ops wm831x_buckp_ops = {
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.list_voltage = regulator_list_voltage_linear,
+	.map_voltage = regulator_map_voltage_linear,
+	.set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
+
+	.is_enabled = regulator_is_enabled_regmap,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.get_status = wm831x_dcdc_get_status,
+	.get_mode = wm831x_dcdc_get_mode,
+	.set_mode = wm831x_dcdc_set_mode,
+	.set_suspend_mode = wm831x_dcdc_set_suspend_mode,
+};
+
+static int wm831x_buckp_probe(struct platform_device *pdev)
+{
+	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
+	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
+	struct regulator_config config = { };
+	int id;
+	struct wm831x_dcdc *dcdc;
+	struct resource *res;
+	int ret, irq;
+
+	if (pdata && pdata->wm831x_num)
+		id = (pdata->wm831x_num * 10) + 1;
+	else
+		id = 0;
+	id = pdev->id - id;
+
+	dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
+
+	dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
+			    GFP_KERNEL);
+	if (!dcdc)
+		return -ENOMEM;
+
+	dcdc->wm831x = wm831x;
+
+	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "No REG resource\n");
+		ret = -EINVAL;
+		goto err;
+	}
+	dcdc->base = res->start;
+
+	snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
+	dcdc->desc.name = dcdc->name;
+
+	snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
+		 "DC%dVDD", id + 1);
+	dcdc->desc.supply_name = dcdc->supply_name;
+
+	dcdc->desc.id = id;
+	dcdc->desc.type = REGULATOR_VOLTAGE;
+	dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
+	dcdc->desc.ops = &wm831x_buckp_ops;
+	dcdc->desc.owner = THIS_MODULE;
+	dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
+	dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
+	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
+	dcdc->desc.enable_mask = 1 << id;
+	dcdc->desc.min_uV = 850000;
+	dcdc->desc.uV_step = 25000;
+
+	config.dev = pdev->dev.parent;
+	if (pdata)
+		config.init_data = pdata->dcdc[id];
+	config.driver_data = dcdc;
+	config.regmap = wm831x->regmap;
+
+	dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
+						  &config);
+	if (IS_ERR(dcdc->regulator)) {
+		ret = PTR_ERR(dcdc->regulator);
+		dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
+			id + 1, ret);
+		goto err;
+	}
+
+	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
+	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+					wm831x_dcdc_uv_irq,
+					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+					dcdc->name, dcdc);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
+			irq, ret);
+		goto err;
+	}
+
+	platform_set_drvdata(pdev, dcdc);
+
+	return 0;
+
+err:
+	return ret;
+}
+
+static struct platform_driver wm831x_buckp_driver = {
+	.probe = wm831x_buckp_probe,
+	.driver		= {
+		.name	= "wm831x-buckp",
+	},
+};
+
+/*
+ * DCDC boost convertors
+ */
+
+static int wm831x_boostp_get_status(struct regulator_dev *rdev)
+{
+	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
+	struct wm831x *wm831x = dcdc->wm831x;
+	int ret;
+
+	/* First, check for errors */
+	ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
+	if (ret < 0)
+		return ret;
+
+	if (ret & (1 << rdev_get_id(rdev))) {
+		dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
+			rdev_get_id(rdev) + 1);
+		return REGULATOR_STATUS_ERROR;
+	}
+
+	/* Is the regulator on? */
+	ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
+	if (ret < 0)
+		return ret;
+	if (ret & (1 << rdev_get_id(rdev)))
+		return REGULATOR_STATUS_ON;
+	else
+		return REGULATOR_STATUS_OFF;
+}
+
+static const struct regulator_ops wm831x_boostp_ops = {
+	.get_status = wm831x_boostp_get_status,
+
+	.is_enabled = regulator_is_enabled_regmap,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+};
+
+static int wm831x_boostp_probe(struct platform_device *pdev)
+{
+	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
+	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
+	struct regulator_config config = { };
+	int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
+	struct wm831x_dcdc *dcdc;
+	struct resource *res;
+	int ret, irq;
+
+	dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
+
+	if (pdata == NULL || pdata->dcdc[id] == NULL)
+		return -ENODEV;
+
+	dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
+	if (!dcdc)
+		return -ENOMEM;
+
+	dcdc->wm831x = wm831x;
+
+	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "No REG resource\n");
+		return -EINVAL;
+	}
+	dcdc->base = res->start;
+
+	snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
+	dcdc->desc.name = dcdc->name;
+	dcdc->desc.id = id;
+	dcdc->desc.type = REGULATOR_VOLTAGE;
+	dcdc->desc.ops = &wm831x_boostp_ops;
+	dcdc->desc.owner = THIS_MODULE;
+	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
+	dcdc->desc.enable_mask = 1 << id;
+
+	config.dev = pdev->dev.parent;
+	if (pdata)
+		config.init_data = pdata->dcdc[id];
+	config.driver_data = dcdc;
+	config.regmap = wm831x->regmap;
+
+	dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
+						  &config);
+	if (IS_ERR(dcdc->regulator)) {
+		ret = PTR_ERR(dcdc->regulator);
+		dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
+			id + 1, ret);
+		return ret;
+	}
+
+	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
+	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+					wm831x_dcdc_uv_irq,
+					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+					dcdc->name,
+					dcdc);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
+			irq, ret);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, dcdc);
+
+	return 0;
+}
+
+static struct platform_driver wm831x_boostp_driver = {
+	.probe = wm831x_boostp_probe,
+	.driver		= {
+		.name	= "wm831x-boostp",
+	},
+};
+
+/*
+ * External Power Enable
+ *
+ * These aren't actually DCDCs but look like them in hardware so share
+ * code.
+ */
+
+#define WM831X_EPE_BASE 6
+
+static const struct regulator_ops wm831x_epe_ops = {
+	.is_enabled = regulator_is_enabled_regmap,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.get_status = wm831x_dcdc_get_status,
+};
+
+static int wm831x_epe_probe(struct platform_device *pdev)
+{
+	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
+	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
+	struct regulator_config config = { };
+	int id = pdev->id % ARRAY_SIZE(pdata->epe);
+	struct wm831x_dcdc *dcdc;
+	int ret;
+
+	dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
+
+	dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
+	if (!dcdc)
+		return -ENOMEM;
+
+	dcdc->wm831x = wm831x;
+
+	/* For current parts this is correct; probably need to revisit
+	 * in future.
+	 */
+	snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
+	dcdc->desc.name = dcdc->name;
+	dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
+	dcdc->desc.ops = &wm831x_epe_ops;
+	dcdc->desc.type = REGULATOR_VOLTAGE;
+	dcdc->desc.owner = THIS_MODULE;
+	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
+	dcdc->desc.enable_mask = 1 << dcdc->desc.id;
+
+	config.dev = pdev->dev.parent;
+	if (pdata)
+		config.init_data = pdata->epe[id];
+	config.driver_data = dcdc;
+	config.regmap = wm831x->regmap;
+
+	dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
+						  &config);
+	if (IS_ERR(dcdc->regulator)) {
+		ret = PTR_ERR(dcdc->regulator);
+		dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
+			id + 1, ret);
+		goto err;
+	}
+
+	platform_set_drvdata(pdev, dcdc);
+
+	return 0;
+
+err:
+	return ret;
+}
+
+static struct platform_driver wm831x_epe_driver = {
+	.probe = wm831x_epe_probe,
+	.driver		= {
+		.name	= "wm831x-epe",
+	},
+};
+
+static struct platform_driver * const drivers[] = {
+	&wm831x_buckv_driver,
+	&wm831x_buckp_driver,
+	&wm831x_boostp_driver,
+	&wm831x_epe_driver,
+};
+
+static int __init wm831x_dcdc_init(void)
+{
+	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
+}
+subsys_initcall(wm831x_dcdc_init);
+
+static void __exit wm831x_dcdc_exit(void)
+{
+	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
+}
+module_exit(wm831x_dcdc_exit);
+
+/* Module information */
+MODULE_AUTHOR("Mark Brown");
+MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm831x-buckv");
+MODULE_ALIAS("platform:wm831x-buckp");
+MODULE_ALIAS("platform:wm831x-boostp");
+MODULE_ALIAS("platform:wm831x-epe");
-- 
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