regulator: Add SpacemiT K1-X regulator driver

Regulator is an important dependecy for other hardware. Port it from the
vendor kernel [1].

[1] - https://github.com/BPI-SINOVOIP/pi-linux.git

Change-Id: I8537925fbc9b31a4dab8d70f107e80bc16033f6f
Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com>

3 files changed, 120 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 965d4f0c18a6..0028e4c0086c 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -1663,4 +1663,13 @@ config REGULATOR_QCOM_LABIBB
 	  boost regulator and IBB can be used as a negative boost regulator
 	  for LCD display panel.
 
+config REGULATOR_SPACEMIT
+	tristate "Spacemit regulator support"
+	depends on MFD_SPACEMIT_PMIC
+	select REGULATOR_FIXED_VOLTAGE
+	help
+	  This driver provides support for the voltage regulators on the
+	   spacemit pmic.
+
+
 endif
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 23074714a81a..2a8cf2152e89 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -196,4 +196,6 @@ obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o
 obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o
 obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o
 
+obj-$(CONFIG_REGULATOR_SPACEMIT) += spacemit-regulator.o
+
 ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/spacemit-regulator.c b/drivers/regulator/spacemit-regulator.c
new file mode 100644
index 000000000000..b96323366cf0
--- /dev/null
+++ b/drivers/regulator/spacemit-regulator.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Regulator driver for Spacemit PMIC
+ *
+ * Copyright (c) 2023, SPACEMIT Co., Ltd
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mfd/spacemit/spacemit_pmic.h>
+
+static const struct regulator_ops pmic_dcdc_ldo_ops = {
+	.list_voltage		= regulator_list_voltage_linear_range,
+	.map_voltage		= regulator_map_voltage_linear_range,
+	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
+	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
+	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
+	.enable			= regulator_enable_regmap,
+	.disable		= regulator_disable_regmap,
+	.is_enabled		= regulator_is_enabled_regmap,
+};
+
+static const struct regulator_ops pmic_switch_ops = {
+	.enable			= regulator_enable_regmap,
+	.disable		= regulator_disable_regmap,
+	.is_enabled		= regulator_is_enabled_regmap,
+};
+
+SPM8821_BUCK_LINER_RANGE;SPM8821_LDO_LINER_RANGE;SPM8821_REGULATOR_DESC;
+SPM8821_REGULATOR_MATCH_DATA;
+
+PM853_BUCK_LINER_RANGE1;PM853_BUCK_LINER_RANGE2;PM853_LDO_LINER_RANGE1;
+PM853_LDO_LINER_RANGE2;PM853_LDO_LINER_RANGE3;PM853_LDO_LINER_RANGE4;
+PM853_REGULATOR_DESC;PM853_REGULATOR_MATCH_DATA;
+
+SY8810L_BUCK_LINER_RANGE;SY8810L_REGULATOR_DESC;SY8810L_REGULATOR_MATCH_DATA;
+
+static const struct of_device_id spacemit_regulator_of_match[] = {
+	{ .compatible = "pmic,regulator,spm8821", .data = (void *)&spm8821_regulator_match_data },
+	{ .compatible = "pmic,regulator,pm853", .data = (void *)&pm853_regulator_match_data },
+	{ .compatible = "pmic,regulator,sy8810l", .data = (void *)&sy8810l_regulator_match_data },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, spacemit_regulator_of_match);
+
+static int spacemit_regulator_probe(struct platform_device *pdev)
+{
+	struct regulator_config config = {};
+	struct spacemit_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
+	struct i2c_client *client;
+	const struct of_device_id *of_id;
+	struct regulator_match_data *match_data;
+	struct regulator_dev *regulator_dev;
+	int i;
+
+	of_id = of_match_device(spacemit_regulator_of_match, &pdev->dev);
+	if (!of_id) {
+		pr_err("Unable to match OF ID\n");
+		return -ENODEV;
+	}
+
+	match_data = (struct regulator_match_data *)of_id->data;
+
+	client = pmic->i2c;
+	config.dev = &client->dev;
+	config.regmap = pmic->regmap;
+
+	if (strcmp(match_data->name, "pm853") == 0) {
+		client = pmic->sub->power_page;
+		config.dev = &pmic->i2c->dev;
+		config.regmap = pmic->sub->power_regmap;	
+	}
+
+	for (i = 0; i < match_data->nr_desc; ++i) {
+		regulator_dev = devm_regulator_register(&pdev->dev,
+				match_data->desc + i, &config);
+		if (IS_ERR(regulator_dev)) {
+			pr_err("failed to register %d regulator\n", i);
+			return PTR_ERR(regulator_dev);
+		}
+	}
+
+	return 0;
+}
+
+static struct platform_driver spacemit_regulator_driver = {
+	.probe = spacemit_regulator_probe,
+	.driver = {
+		.name = "spacemit-regulator",
+		.of_match_table = spacemit_regulator_of_match,
+	},
+};
+
+static int spacemit_regulator_init(void)
+{
+	return platform_driver_register(&spacemit_regulator_driver);
+}
+subsys_initcall(spacemit_regulator_init);
+
+MODULE_DESCRIPTION("regulator drivers for the Spacemit series PMICs");
+