regulator: qcom: Add labibb driver

Qualcomm platforms have LAB(LCD AMOLED Boost)/IBB(Inverting Buck Boost)
regulators, labibb for short, which are used as power supply for
LCD Mode displays.

This patch adds labibb regulator driver for pmi8998 PMIC, found on
SDM845 platforms.

  [sumits: reworked the driver design as per upstream review]

Signed-off-by: Nisha Kumari <nishakumari@codeaurora.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://lore.kernel.org/r/20200622124110.20971-5-sumit.semwal@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Nisha Kumari 2020-06-22 18:11:10 +05:30 committed by Mark Brown
parent f7d7ad42a9
commit 498ab2fdf8
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
3 changed files with 186 additions and 0 deletions

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@ -1223,5 +1223,15 @@ config REGULATOR_WM8994
This driver provides support for the voltage regulators on the
WM8994 CODEC.
config REGULATOR_QCOM_LABIBB
tristate "QCOM LAB/IBB regulator support"
depends on SPMI || COMPILE_TEST
help
This driver supports Qualcomm's LAB/IBB regulators present on the
Qualcomm's PMIC chip pmi8998. QCOM LAB and IBB are SPMI
based PMIC implementations. LAB can be used as positive
boost regulator and IBB can be used as a negative boost regulator
for LCD display panel.
endif

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@ -90,6 +90,7 @@ obj-$(CONFIG_REGULATOR_MT6323) += mt6323-regulator.o
obj-$(CONFIG_REGULATOR_MT6358) += mt6358-regulator.o
obj-$(CONFIG_REGULATOR_MT6380) += mt6380-regulator.o
obj-$(CONFIG_REGULATOR_MT6397) += mt6397-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_LABIBB) += qcom-labibb-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_RPMH) += qcom-rpmh-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_SMD_RPM) += qcom_smd-regulator.o

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@ -0,0 +1,175 @@
// SPDX-License-Identifier: GPL-2.0-only
// Copyright (c) 2020, The Linux Foundation. All rights reserved.
#include <linux/module.h>
#include <linux/of_irq.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#define REG_PERPH_TYPE 0x04
#define QCOM_LAB_TYPE 0x24
#define QCOM_IBB_TYPE 0x20
#define PMI8998_LAB_REG_BASE 0xde00
#define PMI8998_IBB_REG_BASE 0xdc00
#define REG_LABIBB_STATUS1 0x08
#define REG_LABIBB_ENABLE_CTL 0x46
#define LABIBB_STATUS1_VREG_OK_BIT BIT(7)
#define LABIBB_CONTROL_ENABLE BIT(7)
#define LAB_ENABLE_CTL_MASK BIT(7)
#define IBB_ENABLE_CTL_MASK (BIT(7) | BIT(6))
#define LABIBB_OFF_ON_DELAY 1000
#define LAB_ENABLE_TIME (LABIBB_OFF_ON_DELAY * 2)
#define IBB_ENABLE_TIME (LABIBB_OFF_ON_DELAY * 10)
#define LABIBB_POLL_ENABLED_TIME 1000
struct labibb_regulator {
struct regulator_desc desc;
struct device *dev;
struct regmap *regmap;
struct regulator_dev *rdev;
u16 base;
u8 type;
};
struct labibb_regulator_data {
const char *name;
u8 type;
u16 base;
struct regulator_desc *desc;
};
static struct regulator_ops qcom_labibb_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
};
static struct regulator_desc pmi8998_lab_desc = {
.enable_mask = LAB_ENABLE_CTL_MASK,
.enable_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_ENABLE_CTL),
.enable_val = LABIBB_CONTROL_ENABLE,
.enable_time = LAB_ENABLE_TIME,
.poll_enabled_time = LABIBB_POLL_ENABLED_TIME,
.off_on_delay = LABIBB_OFF_ON_DELAY,
.owner = THIS_MODULE,
.type = REGULATOR_VOLTAGE,
.ops = &qcom_labibb_ops,
};
static struct regulator_desc pmi8998_ibb_desc = {
.enable_mask = IBB_ENABLE_CTL_MASK,
.enable_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_ENABLE_CTL),
.enable_val = LABIBB_CONTROL_ENABLE,
.enable_time = IBB_ENABLE_TIME,
.poll_enabled_time = LABIBB_POLL_ENABLED_TIME,
.off_on_delay = LABIBB_OFF_ON_DELAY,
.owner = THIS_MODULE,
.type = REGULATOR_VOLTAGE,
.ops = &qcom_labibb_ops,
};
static const struct labibb_regulator_data pmi8998_labibb_data[] = {
{"lab", QCOM_LAB_TYPE, PMI8998_LAB_REG_BASE, &pmi8998_lab_desc},
{"ibb", QCOM_IBB_TYPE, PMI8998_IBB_REG_BASE, &pmi8998_ibb_desc},
{ },
};
static const struct of_device_id qcom_labibb_match[] = {
{ .compatible = "qcom,pmi8998-lab-ibb", .data = &pmi8998_labibb_data},
{ },
};
MODULE_DEVICE_TABLE(of, qcom_labibb_match);
static int qcom_labibb_regulator_probe(struct platform_device *pdev)
{
struct labibb_regulator *vreg;
struct device *dev = &pdev->dev;
struct regulator_config cfg = {};
const struct of_device_id *match;
const struct labibb_regulator_data *reg_data;
struct regmap *reg_regmap;
unsigned int type;
int ret;
reg_regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!reg_regmap) {
dev_err(&pdev->dev, "Couldn't get parent's regmap\n");
return -ENODEV;
}
match = of_match_device(qcom_labibb_match, &pdev->dev);
if (!match)
return -ENODEV;
for (reg_data = match->data; reg_data->name; reg_data++) {
/* Validate if the type of regulator is indeed
* what's mentioned in DT.
*/
ret = regmap_read(reg_regmap, reg_data->base + REG_PERPH_TYPE,
&type);
if (ret < 0) {
dev_err(dev,
"Peripheral type read failed ret=%d\n",
ret);
return -EINVAL;
}
if (WARN_ON((type != QCOM_LAB_TYPE) && (type != QCOM_IBB_TYPE)) ||
WARN_ON(type != reg_data->type))
return -EINVAL;
vreg = devm_kzalloc(&pdev->dev, sizeof(*vreg),
GFP_KERNEL);
if (!vreg)
return -ENOMEM;
vreg->regmap = reg_regmap;
vreg->dev = dev;
vreg->base = reg_data->base;
vreg->type = reg_data->type;
memcpy(&vreg->desc, reg_data->desc, sizeof(vreg->desc));
vreg->desc.of_match = reg_data->name;
vreg->desc.name = reg_data->name;
cfg.dev = vreg->dev;
cfg.driver_data = vreg;
cfg.regmap = vreg->regmap;
vreg->rdev = devm_regulator_register(vreg->dev, &vreg->desc,
&cfg);
if (IS_ERR(vreg->rdev)) {
dev_err(dev, "qcom_labibb: error registering %s : %d\n",
reg_data->name, ret);
return PTR_ERR(vreg->rdev);
}
}
return 0;
}
static struct platform_driver qcom_labibb_regulator_driver = {
.driver = {
.name = "qcom-lab-ibb-regulator",
.of_match_table = qcom_labibb_match,
},
.probe = qcom_labibb_regulator_probe,
};
module_platform_driver(qcom_labibb_regulator_driver);
MODULE_DESCRIPTION("Qualcomm labibb driver");
MODULE_AUTHOR("Nisha Kumari <nishakumari@codeaurora.org>");
MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
MODULE_LICENSE("GPL v2");