regulator: qcom-rpm: Regulator driver for the Qualcomm RPM
authorBjorn Andersson <bjorn.andersson@sonymobile.com>
Mon, 22 Sep 2014 23:25:29 +0000 (16:25 -0700)
committerMark Brown <broonie@kernel.org>
Wed, 24 Sep 2014 08:35:10 +0000 (09:35 +0100)
Driver for regulators exposed by the Resource Power Manager (RPM) found
in Qualcomm 8660, 8960 and 8064 based devices.

Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
drivers/regulator/Kconfig
drivers/regulator/Makefile
drivers/regulator/qcom_rpm-regulator.c [new file with mode: 0644]

index 2dc8289e5dba772be498e084505c72d89491b3fb..0e59754d8df29ed51a841fafcf63c35c746805e0 100644 (file)
@@ -449,6 +449,18 @@ config REGULATOR_PFUZE100
          Say y here to support the regulators found on the Freescale
          PFUZE100/PFUZE200 PMIC.
 
+config REGULATOR_QCOM_RPM
+       tristate "Qualcomm RPM regulator driver"
+       depends on MFD_QCOM_RPM
+       help
+         If you say yes to this option, support will be included for the
+         regulators exposed by the Resource Power Manager found in Qualcomm
+         8660, 8960 and 8064 based devices.
+
+         Say M here if you want to include support for the regulators on the
+         Qualcomm RPM as a module. The module will be named
+         "qcom_rpm-regulator".
+
 config REGULATOR_RC5T583
        tristate "RICOH RC5T583 Power regulators"
        depends on MFD_RC5T583
index aa4a6aa7b55827b4dab12789e40b97c5443ee8a0..9c50dc61d92754be22e4ae936b7d77dd493a0ba5 100644 (file)
@@ -55,6 +55,7 @@ obj-$(CONFIG_REGULATOR_MAX77693) += max77693.o
 obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
 obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
 obj-$(CONFIG_REGULATOR_MC13XXX_CORE) +=  mc13xxx-regulator-core.o
+obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o
 obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o
 obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o
 obj-$(CONFIG_REGULATOR_TPS51632) += tps51632-regulator.o
diff --git a/drivers/regulator/qcom_rpm-regulator.c b/drivers/regulator/qcom_rpm-regulator.c
new file mode 100644 (file)
index 0000000..8f28309
--- /dev/null
@@ -0,0 +1,798 @@
+/*
+ * Copyright (c) 2014, Sony Mobile Communications AB.
+ * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/mfd/qcom_rpm.h>
+
+#include <dt-bindings/mfd/qcom-rpm.h>
+
+#define MAX_REQUEST_LEN 2
+
+struct request_member {
+       int             word;
+       unsigned int    mask;
+       int             shift;
+};
+
+struct rpm_reg_parts {
+       struct request_member mV;               /* used if voltage is in mV */
+       struct request_member uV;               /* used if voltage is in uV */
+       struct request_member ip;               /* peak current in mA */
+       struct request_member pd;               /* pull down enable */
+       struct request_member ia;               /* average current in mA */
+       struct request_member fm;               /* force mode */
+       struct request_member pm;               /* power mode */
+       struct request_member pc;               /* pin control */
+       struct request_member pf;               /* pin function */
+       struct request_member enable_state;     /* NCP and switch */
+       struct request_member comp_mode;        /* NCP */
+       struct request_member freq;             /* frequency: NCP and SMPS */
+       struct request_member freq_clk_src;     /* clock source: SMPS */
+       struct request_member hpm;              /* switch: control OCP and SS */
+       int request_len;
+};
+
+#define FORCE_MODE_IS_2_BITS(reg) \
+       ((vreg->parts->fm.mask >> vreg->parts->fm.shift) == 3)
+
+struct qcom_rpm_reg {
+       struct qcom_rpm *rpm;
+
+       struct mutex lock;
+       struct device *dev;
+       struct regulator_desc desc;
+       const struct rpm_reg_parts *parts;
+
+       int resource;
+       u32 val[MAX_REQUEST_LEN];
+
+       int uV;
+       int is_enabled;
+
+       bool supports_force_mode_auto;
+       bool supports_force_mode_bypass;
+};
+
+static const struct rpm_reg_parts rpm8660_ldo_parts = {
+       .request_len    = 2,
+       .mV             = { 0, 0x00000FFF,  0 },
+       .ip             = { 0, 0x00FFF000, 12 },
+       .fm             = { 0, 0x03000000, 24 },
+       .pc             = { 0, 0x3C000000, 26 },
+       .pf             = { 0, 0xC0000000, 30 },
+       .pd             = { 1, 0x00000001,  0 },
+       .ia             = { 1, 0x00001FFE,  1 },
+};
+
+static const struct rpm_reg_parts rpm8660_smps_parts = {
+       .request_len    = 2,
+       .mV             = { 0, 0x00000FFF,  0 },
+       .ip             = { 0, 0x00FFF000, 12 },
+       .fm             = { 0, 0x03000000, 24 },
+       .pc             = { 0, 0x3C000000, 26 },
+       .pf             = { 0, 0xC0000000, 30 },
+       .pd             = { 1, 0x00000001,  0 },
+       .ia             = { 1, 0x00001FFE,  1 },
+       .freq           = { 1, 0x001FE000, 13 },
+       .freq_clk_src   = { 1, 0x00600000, 21 },
+};
+
+static const struct rpm_reg_parts rpm8660_switch_parts = {
+       .request_len    = 1,
+       .enable_state   = { 0, 0x00000001,  0 },
+       .pd             = { 0, 0x00000002,  1 },
+       .pc             = { 0, 0x0000003C,  2 },
+       .pf             = { 0, 0x000000C0,  6 },
+       .hpm            = { 0, 0x00000300,  8 },
+};
+
+static const struct rpm_reg_parts rpm8660_ncp_parts = {
+       .request_len    = 1,
+       .mV             = { 0, 0x00000FFF,  0 },
+       .enable_state   = { 0, 0x00001000, 12 },
+       .comp_mode      = { 0, 0x00002000, 13 },
+       .freq           = { 0, 0x003FC000, 14 },
+};
+
+static const struct rpm_reg_parts rpm8960_ldo_parts = {
+       .request_len    = 2,
+       .uV             = { 0, 0x007FFFFF,  0 },
+       .pd             = { 0, 0x00800000, 23 },
+       .pc             = { 0, 0x0F000000, 24 },
+       .pf             = { 0, 0xF0000000, 28 },
+       .ip             = { 1, 0x000003FF,  0 },
+       .ia             = { 1, 0x000FFC00, 10 },
+       .fm             = { 1, 0x00700000, 20 },
+};
+
+static const struct rpm_reg_parts rpm8960_smps_parts = {
+       .request_len    = 2,
+       .uV             = { 0, 0x007FFFFF,  0 },
+       .pd             = { 0, 0x00800000, 23 },
+       .pc             = { 0, 0x0F000000, 24 },
+       .pf             = { 0, 0xF0000000, 28 },
+       .ip             = { 1, 0x000003FF,  0 },
+       .ia             = { 1, 0x000FFC00, 10 },
+       .fm             = { 1, 0x00700000, 20 },
+       .pm             = { 1, 0x00800000, 23 },
+       .freq           = { 1, 0x1F000000, 24 },
+       .freq_clk_src   = { 1, 0x60000000, 29 },
+};
+
+static const struct rpm_reg_parts rpm8960_switch_parts = {
+       .request_len    = 1,
+       .enable_state   = { 0, 0x00000001,  0 },
+       .pd             = { 0, 0x00000002,  1 },
+       .pc             = { 0, 0x0000003C,  2 },
+       .pf             = { 0, 0x000003C0,  6 },
+       .hpm            = { 0, 0x00000C00, 10 },
+};
+
+static const struct rpm_reg_parts rpm8960_ncp_parts = {
+       .request_len    = 1,
+       .uV             = { 0, 0x007FFFFF,  0 },
+       .enable_state   = { 0, 0x00800000, 23 },
+       .comp_mode      = { 0, 0x01000000, 24 },
+       .freq           = { 0, 0x3E000000, 25 },
+};
+
+/*
+ * Physically available PMIC regulator voltage ranges
+ */
+static const struct regulator_linear_range pldo_ranges[] = {
+       REGULATOR_LINEAR_RANGE( 750000,   0,  59, 12500),
+       REGULATOR_LINEAR_RANGE(1500000,  60, 123, 25000),
+       REGULATOR_LINEAR_RANGE(3100000, 124, 160, 50000),
+};
+
+static const struct regulator_linear_range nldo_ranges[] = {
+       REGULATOR_LINEAR_RANGE( 750000,   0,  63, 12500),
+};
+
+static const struct regulator_linear_range nldo1200_ranges[] = {
+       REGULATOR_LINEAR_RANGE( 375000,   0,  59,  6250),
+       REGULATOR_LINEAR_RANGE( 750000,  60, 123, 12500),
+};
+
+static const struct regulator_linear_range smps_ranges[] = {
+       REGULATOR_LINEAR_RANGE( 375000,   0,  29, 12500),
+       REGULATOR_LINEAR_RANGE( 750000,  30,  89, 12500),
+       REGULATOR_LINEAR_RANGE(1500000,  90, 153, 25000),
+};
+
+static const struct regulator_linear_range ftsmps_ranges[] = {
+       REGULATOR_LINEAR_RANGE( 350000,   0,   6, 50000),
+       REGULATOR_LINEAR_RANGE( 700000,   7,  63, 12500),
+       REGULATOR_LINEAR_RANGE(1500000,  64, 100, 50000),
+};
+
+static const struct regulator_linear_range ncp_ranges[] = {
+       REGULATOR_LINEAR_RANGE(1500000,   0,  31, 50000),
+};
+
+static int rpm_reg_write(struct qcom_rpm_reg *vreg,
+                        const struct request_member *req,
+                        const int value)
+{
+       if (WARN_ON((value << req->shift) & ~req->mask))
+               return -EINVAL;
+
+       vreg->val[req->word] &= ~req->mask;
+       vreg->val[req->word] |= value << req->shift;
+
+       return qcom_rpm_write(vreg->rpm,
+                             vreg->resource,
+                             vreg->val,
+                             vreg->parts->request_len);
+}
+
+static int rpm_reg_set_mV_sel(struct regulator_dev *rdev,
+                             unsigned selector)
+{
+       struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+       const struct rpm_reg_parts *parts = vreg->parts;
+       const struct request_member *req = &parts->mV;
+       int ret = 0;
+       int uV;
+
+       if (req->mask == 0)
+               return -EINVAL;
+
+       uV = regulator_list_voltage_linear_range(rdev, selector);
+       if (uV < 0)
+               return uV;
+
+       mutex_lock(&vreg->lock);
+       vreg->uV = uV;
+       if (vreg->is_enabled)
+               ret = rpm_reg_write(vreg, req, vreg->uV / 1000);
+       mutex_unlock(&vreg->lock);
+
+       return ret;
+}
+
+static int rpm_reg_set_uV_sel(struct regulator_dev *rdev,
+                             unsigned selector)
+{
+       struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+       const struct rpm_reg_parts *parts = vreg->parts;
+       const struct request_member *req = &parts->uV;
+       int ret = 0;
+       int uV;
+
+       if (req->mask == 0)
+               return -EINVAL;
+
+       uV = regulator_list_voltage_linear_range(rdev, selector);
+       if (uV < 0)
+               return uV;
+
+       mutex_lock(&vreg->lock);
+       vreg->uV = uV;
+       if (vreg->is_enabled)
+               ret = rpm_reg_write(vreg, req, vreg->uV);
+       mutex_unlock(&vreg->lock);
+
+       return ret;
+}
+
+static int rpm_reg_get_voltage(struct regulator_dev *rdev)
+{
+       struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+
+       return vreg->uV;
+}
+
+static int rpm_reg_mV_enable(struct regulator_dev *rdev)
+{
+       struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+       const struct rpm_reg_parts *parts = vreg->parts;
+       const struct request_member *req = &parts->mV;
+       int ret;
+
+       if (req->mask == 0)
+               return -EINVAL;
+
+       mutex_lock(&vreg->lock);
+       ret = rpm_reg_write(vreg, req, vreg->uV / 1000);
+       if (!ret)
+               vreg->is_enabled = 1;
+       mutex_unlock(&vreg->lock);
+
+       return ret;
+}
+
+static int rpm_reg_uV_enable(struct regulator_dev *rdev)
+{
+       struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+       const struct rpm_reg_parts *parts = vreg->parts;
+       const struct request_member *req = &parts->uV;
+       int ret;
+
+       if (req->mask == 0)
+               return -EINVAL;
+
+       mutex_lock(&vreg->lock);
+       ret = rpm_reg_write(vreg, req, vreg->uV);
+       if (!ret)
+               vreg->is_enabled = 1;
+       mutex_unlock(&vreg->lock);
+
+       return ret;
+}
+
+static int rpm_reg_switch_enable(struct regulator_dev *rdev)
+{
+       struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+       const struct rpm_reg_parts *parts = vreg->parts;
+       const struct request_member *req = &parts->enable_state;
+       int ret;
+
+       if (req->mask == 0)
+               return -EINVAL;
+
+       mutex_lock(&vreg->lock);
+       ret = rpm_reg_write(vreg, req, 1);
+       if (!ret)
+               vreg->is_enabled = 1;
+       mutex_unlock(&vreg->lock);
+
+       return ret;
+}
+
+static int rpm_reg_mV_disable(struct regulator_dev *rdev)
+{
+       struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+       const struct rpm_reg_parts *parts = vreg->parts;
+       const struct request_member *req = &parts->mV;
+       int ret;
+
+       if (req->mask == 0)
+               return -EINVAL;
+
+       mutex_lock(&vreg->lock);
+       ret = rpm_reg_write(vreg, req, 0);
+       if (!ret)
+               vreg->is_enabled = 0;
+       mutex_unlock(&vreg->lock);
+
+       return ret;
+}
+
+static int rpm_reg_uV_disable(struct regulator_dev *rdev)
+{
+       struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+       const struct rpm_reg_parts *parts = vreg->parts;
+       const struct request_member *req = &parts->uV;
+       int ret;
+
+       if (req->mask == 0)
+               return -EINVAL;
+
+       mutex_lock(&vreg->lock);
+       ret = rpm_reg_write(vreg, req, 0);
+       if (!ret)
+               vreg->is_enabled = 0;
+       mutex_unlock(&vreg->lock);
+
+       return ret;
+}
+
+static int rpm_reg_switch_disable(struct regulator_dev *rdev)
+{
+       struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+       const struct rpm_reg_parts *parts = vreg->parts;
+       const struct request_member *req = &parts->enable_state;
+       int ret;
+
+       if (req->mask == 0)
+               return -EINVAL;
+
+       mutex_lock(&vreg->lock);
+       ret = rpm_reg_write(vreg, req, 0);
+       if (!ret)
+               vreg->is_enabled = 0;
+       mutex_unlock(&vreg->lock);
+
+       return ret;
+}
+
+static int rpm_reg_is_enabled(struct regulator_dev *rdev)
+{
+       struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+
+       return vreg->is_enabled;
+}
+
+static struct regulator_ops uV_ops = {
+       .list_voltage = regulator_list_voltage_linear_range,
+
+       .set_voltage_sel = rpm_reg_set_uV_sel,
+       .get_voltage = rpm_reg_get_voltage,
+
+       .enable = rpm_reg_uV_enable,
+       .disable = rpm_reg_uV_disable,
+       .is_enabled = rpm_reg_is_enabled,
+};
+
+static struct regulator_ops mV_ops = {
+       .list_voltage = regulator_list_voltage_linear_range,
+
+       .set_voltage_sel = rpm_reg_set_mV_sel,
+       .get_voltage = rpm_reg_get_voltage,
+
+       .enable = rpm_reg_mV_enable,
+       .disable = rpm_reg_mV_disable,
+       .is_enabled = rpm_reg_is_enabled,
+};
+
+static struct regulator_ops switch_ops = {
+       .enable = rpm_reg_switch_enable,
+       .disable = rpm_reg_switch_disable,
+       .is_enabled = rpm_reg_is_enabled,
+};
+
+/*
+ * PM8058 regulators
+ */
+static const struct qcom_rpm_reg pm8058_pldo = {
+       .desc.linear_ranges = pldo_ranges,
+       .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
+       .desc.n_voltages = 161,
+       .desc.ops = &mV_ops,
+       .parts = &rpm8660_ldo_parts,
+       .supports_force_mode_auto = false,
+       .supports_force_mode_bypass = false,
+};
+
+static const struct qcom_rpm_reg pm8058_nldo = {
+       .desc.linear_ranges = nldo_ranges,
+       .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
+       .desc.n_voltages = 64,
+       .desc.ops = &mV_ops,
+       .parts = &rpm8660_ldo_parts,
+       .supports_force_mode_auto = false,
+       .supports_force_mode_bypass = false,
+};
+
+static const struct qcom_rpm_reg pm8058_smps = {
+       .desc.linear_ranges = smps_ranges,
+       .desc.n_linear_ranges = ARRAY_SIZE(smps_ranges),
+       .desc.n_voltages = 154,
+       .desc.ops = &mV_ops,
+       .parts = &rpm8660_smps_parts,
+       .supports_force_mode_auto = false,
+       .supports_force_mode_bypass = false,
+};
+
+static const struct qcom_rpm_reg pm8058_ncp = {
+       .desc.linear_ranges = ncp_ranges,
+       .desc.n_linear_ranges = ARRAY_SIZE(ncp_ranges),
+       .desc.n_voltages = 32,
+       .desc.ops = &mV_ops,
+       .parts = &rpm8660_ncp_parts,
+};
+
+static const struct qcom_rpm_reg pm8058_switch = {
+       .desc.ops = &switch_ops,
+       .parts = &rpm8660_switch_parts,
+};
+
+/*
+ * PM8901 regulators
+ */
+static const struct qcom_rpm_reg pm8901_pldo = {
+       .desc.linear_ranges = pldo_ranges,
+       .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
+       .desc.n_voltages = 161,
+       .desc.ops = &mV_ops,
+       .parts = &rpm8660_ldo_parts,
+       .supports_force_mode_auto = false,
+       .supports_force_mode_bypass = true,
+};
+
+static const struct qcom_rpm_reg pm8901_nldo = {
+       .desc.linear_ranges = nldo_ranges,
+       .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
+       .desc.n_voltages = 64,
+       .desc.ops = &mV_ops,
+       .parts = &rpm8660_ldo_parts,
+       .supports_force_mode_auto = false,
+       .supports_force_mode_bypass = true,
+};
+
+static const struct qcom_rpm_reg pm8901_ftsmps = {
+       .desc.linear_ranges = ftsmps_ranges,
+       .desc.n_linear_ranges = ARRAY_SIZE(ftsmps_ranges),
+       .desc.n_voltages = 101,
+       .desc.ops = &mV_ops,
+       .parts = &rpm8660_smps_parts,
+       .supports_force_mode_auto = true,
+       .supports_force_mode_bypass = false,
+};
+
+static const struct qcom_rpm_reg pm8901_switch = {
+       .desc.ops = &switch_ops,
+       .parts = &rpm8660_switch_parts,
+};
+
+/*
+ * PM8921 regulators
+ */
+static const struct qcom_rpm_reg pm8921_pldo = {
+       .desc.linear_ranges = pldo_ranges,
+       .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
+       .desc.n_voltages = 161,
+       .desc.ops = &uV_ops,
+       .parts = &rpm8960_ldo_parts,
+       .supports_force_mode_auto = false,
+       .supports_force_mode_bypass = true,
+};
+
+static const struct qcom_rpm_reg pm8921_nldo = {
+       .desc.linear_ranges = nldo_ranges,
+       .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
+       .desc.n_voltages = 64,
+       .desc.ops = &uV_ops,
+       .parts = &rpm8960_ldo_parts,
+       .supports_force_mode_auto = false,
+       .supports_force_mode_bypass = true,
+};
+
+static const struct qcom_rpm_reg pm8921_nldo1200 = {
+       .desc.linear_ranges = nldo1200_ranges,
+       .desc.n_linear_ranges = ARRAY_SIZE(nldo1200_ranges),
+       .desc.n_voltages = 124,
+       .desc.ops = &uV_ops,
+       .parts = &rpm8960_ldo_parts,
+       .supports_force_mode_auto = false,
+       .supports_force_mode_bypass = true,
+};
+
+static const struct qcom_rpm_reg pm8921_smps = {
+       .desc.linear_ranges = smps_ranges,
+       .desc.n_linear_ranges = ARRAY_SIZE(smps_ranges),
+       .desc.n_voltages = 154,
+       .desc.ops = &uV_ops,
+       .parts = &rpm8960_smps_parts,
+       .supports_force_mode_auto = true,
+       .supports_force_mode_bypass = false,
+};
+
+static const struct qcom_rpm_reg pm8921_ftsmps = {
+       .desc.linear_ranges = ftsmps_ranges,
+       .desc.n_linear_ranges = ARRAY_SIZE(ftsmps_ranges),
+       .desc.n_voltages = 101,
+       .desc.ops = &uV_ops,
+       .parts = &rpm8960_smps_parts,
+       .supports_force_mode_auto = true,
+       .supports_force_mode_bypass = false,
+};
+
+static const struct qcom_rpm_reg pm8921_ncp = {
+       .desc.linear_ranges = ncp_ranges,
+       .desc.n_linear_ranges = ARRAY_SIZE(ncp_ranges),
+       .desc.n_voltages = 32,
+       .desc.ops = &uV_ops,
+       .parts = &rpm8960_ncp_parts,
+};
+
+static const struct qcom_rpm_reg pm8921_switch = {
+       .desc.ops = &switch_ops,
+       .parts = &rpm8960_switch_parts,
+};
+
+static const struct of_device_id rpm_of_match[] = {
+       { .compatible = "qcom,rpm-pm8058-pldo",     .data = &pm8058_pldo },
+       { .compatible = "qcom,rpm-pm8058-nldo",     .data = &pm8058_nldo },
+       { .compatible = "qcom,rpm-pm8058-smps",     .data = &pm8058_smps },
+       { .compatible = "qcom,rpm-pm8058-ncp",      .data = &pm8058_ncp },
+       { .compatible = "qcom,rpm-pm8058-switch",   .data = &pm8058_switch },
+
+       { .compatible = "qcom,rpm-pm8901-pldo",     .data = &pm8901_pldo },
+       { .compatible = "qcom,rpm-pm8901-nldo",     .data = &pm8901_nldo },
+       { .compatible = "qcom,rpm-pm8901-ftsmps",   .data = &pm8901_ftsmps },
+       { .compatible = "qcom,rpm-pm8901-switch",   .data = &pm8901_switch },
+
+       { .compatible = "qcom,rpm-pm8921-pldo",     .data = &pm8921_pldo },
+       { .compatible = "qcom,rpm-pm8921-nldo",     .data = &pm8921_nldo },
+       { .compatible = "qcom,rpm-pm8921-nldo1200", .data = &pm8921_nldo1200 },
+       { .compatible = "qcom,rpm-pm8921-smps",     .data = &pm8921_smps },
+       { .compatible = "qcom,rpm-pm8921-ftsmps",   .data = &pm8921_ftsmps },
+       { .compatible = "qcom,rpm-pm8921-ncp",      .data = &pm8921_ncp },
+       { .compatible = "qcom,rpm-pm8921-switch",   .data = &pm8921_switch },
+       { }
+};
+MODULE_DEVICE_TABLE(of, rpm_of_match);
+
+static int rpm_reg_set(struct qcom_rpm_reg *vreg,
+                      const struct request_member *req,
+                      const int value)
+{
+       if (req->mask == 0 || (value << req->shift) & ~req->mask)
+               return -EINVAL;
+
+       vreg->val[req->word] &= ~req->mask;
+       vreg->val[req->word] |= value << req->shift;
+
+       return 0;
+}
+
+static int rpm_reg_of_parse_freq(struct device *dev, struct qcom_rpm_reg *vreg)
+{
+       static const int freq_table[] = {
+               19200000, 9600000, 6400000, 4800000, 3840000, 3200000, 2740000,
+               2400000, 2130000, 1920000, 1750000, 1600000, 1480000, 1370000,
+               1280000, 1200000,
+
+       };
+       const char *key;
+       u32 freq;
+       int ret;
+       int i;
+
+       key = "qcom,switch-mode-frequency";
+       ret = of_property_read_u32(dev->of_node, key, &freq);
+       if (ret) {
+               dev_err(dev, "regulator requires %s property\n", key);
+               return -EINVAL;
+       }
+
+       for (i = 0; i < ARRAY_SIZE(freq_table); i++) {
+               if (freq == freq_table[i]) {
+                       rpm_reg_set(vreg, &vreg->parts->freq, i + 1);
+                       return 0;
+               }
+       }
+
+       dev_err(dev, "invalid frequency %d\n", freq);
+       return -EINVAL;
+}
+
+static int rpm_reg_probe(struct platform_device *pdev)
+{
+       struct regulator_init_data *initdata;
+       const struct qcom_rpm_reg *template;
+       const struct of_device_id *match;
+       struct regulator_config config = { 0 };
+       struct regulator_dev *rdev;
+       struct qcom_rpm_reg *vreg;
+       const char *key;
+       u32 force_mode;
+       bool pwm;
+       u32 val;
+       int ret;
+
+       match = of_match_device(rpm_of_match, &pdev->dev);
+       template = match->data;
+
+       initdata = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node);
+       if (!initdata)
+               return -EINVAL;
+
+       vreg = devm_kmalloc(&pdev->dev, sizeof(*vreg), GFP_KERNEL);
+       if (!vreg) {
+               dev_err(&pdev->dev, "failed to allocate vreg\n");
+               return -ENOMEM;
+       }
+       memcpy(vreg, template, sizeof(*vreg));
+       mutex_init(&vreg->lock);
+       vreg->dev = &pdev->dev;
+       vreg->desc.id = -1;
+       vreg->desc.owner = THIS_MODULE;
+       vreg->desc.type = REGULATOR_VOLTAGE;
+       vreg->desc.name = pdev->dev.of_node->name;
+
+       vreg->rpm = dev_get_drvdata(pdev->dev.parent);
+       if (!vreg->rpm) {
+               dev_err(&pdev->dev, "unable to retrieve handle to rpm\n");
+               return -ENODEV;
+       }
+
+       key = "reg";
+       ret = of_property_read_u32(pdev->dev.of_node, key, &val);
+       if (ret) {
+               dev_err(&pdev->dev, "failed to read %s\n", key);
+               return ret;
+       }
+       vreg->resource = val;
+
+       if ((vreg->parts->uV.mask || vreg->parts->mV.mask) &&
+           (!initdata->constraints.min_uV || !initdata->constraints.max_uV)) {
+               dev_err(&pdev->dev, "no voltage specified for regulator\n");
+               return -EINVAL;
+       }
+
+       key = "bias-pull-down";
+       if (of_property_read_bool(pdev->dev.of_node, key)) {
+               ret = rpm_reg_set(vreg, &vreg->parts->pd, 1);
+               if (ret) {
+                       dev_err(&pdev->dev, "%s is invalid", key);
+                       return ret;
+               }
+       }
+
+       if (vreg->parts->freq.mask) {
+               ret = rpm_reg_of_parse_freq(&pdev->dev, vreg);
+               if (ret < 0)
+                       return ret;
+       }
+
+       if (vreg->parts->pm.mask) {
+               key = "qcom,power-mode-hysteretic";
+               pwm = !of_property_read_bool(pdev->dev.of_node, key);
+
+               ret = rpm_reg_set(vreg, &vreg->parts->pm, pwm);
+               if (ret) {
+                       dev_err(&pdev->dev, "failed to set power mode\n");
+                       return ret;
+               }
+       }
+
+       if (vreg->parts->fm.mask) {
+               force_mode = -1;
+
+               key = "qcom,force-mode";
+               ret = of_property_read_u32(pdev->dev.of_node, key, &val);
+               if (ret == -EINVAL) {
+                       val = QCOM_RPM_FORCE_MODE_NONE;
+               } else if (ret < 0) {
+                       dev_err(&pdev->dev, "failed to read %s\n", key);
+                       return ret;
+               }
+
+               /*
+                * If force-mode is encoded as 2 bits then the
+                * possible register values are:
+                * NONE, LPM, HPM
+                * otherwise:
+                * NONE, LPM, AUTO, HPM, BYPASS
+                */
+               switch (val) {
+               case QCOM_RPM_FORCE_MODE_NONE:
+                       force_mode = 0;
+                       break;
+               case QCOM_RPM_FORCE_MODE_LPM:
+                       force_mode = 1;
+                       break;
+               case QCOM_RPM_FORCE_MODE_HPM:
+                       if (FORCE_MODE_IS_2_BITS(vreg))
+                               force_mode = 2;
+                       else
+                               force_mode = 3;
+                       break;
+               case QCOM_RPM_FORCE_MODE_AUTO:
+                       if (vreg->supports_force_mode_auto)
+                               force_mode = 2;
+                       break;
+               case QCOM_RPM_FORCE_MODE_BYPASS:
+                       if (vreg->supports_force_mode_bypass)
+                               force_mode = 4;
+                       break;
+               }
+
+               if (force_mode < 0) {
+                       dev_err(&pdev->dev, "invalid force mode\n");
+                       return -EINVAL;
+               }
+
+               ret = rpm_reg_set(vreg, &vreg->parts->fm, force_mode);
+               if (ret) {
+                       dev_err(&pdev->dev, "failed to set force mode\n");
+                       return ret;
+               }
+       }
+
+       config.dev = &pdev->dev;
+       config.init_data = initdata;
+       config.driver_data = vreg;
+       config.of_node = pdev->dev.of_node;
+       rdev = devm_regulator_register(&pdev->dev, &vreg->desc, &config);
+       if (IS_ERR(rdev)) {
+               dev_err(&pdev->dev, "can't register regulator\n");
+               return PTR_ERR(rdev);
+       }
+
+       return 0;
+}
+
+static struct platform_driver rpm_reg_driver = {
+       .probe          = rpm_reg_probe,
+       .driver  = {
+               .name  = "qcom_rpm_reg",
+               .owner = THIS_MODULE,
+               .of_match_table = of_match_ptr(rpm_of_match),
+       },
+};
+
+static int __init rpm_reg_init(void)
+{
+       return platform_driver_register(&rpm_reg_driver);
+}
+subsys_initcall(rpm_reg_init);
+
+static void __exit rpm_reg_exit(void)
+{
+       platform_driver_unregister(&rpm_reg_driver);
+}
+module_exit(rpm_reg_exit)
+
+MODULE_DESCRIPTION("Qualcomm RPM regulator driver");
+MODULE_LICENSE("GPL v2");