power: pmic: add the base TPS80031 PMIC support

Add support to bind the regulators/child nodes with the pmic.
Also adds the pmic i2c based read/write functions to access pmic
registers.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

5 files changed, 215 insertions, 0 deletions

diff --git a/doc/device-tree-bindings/pmic/tps80031.txt b/doc/device-tree-bindings/pmic/tps80031.txt
new file mode 100644
index 0000000..577e6de
--- /dev/null
+++ b/doc/device-tree-bindings/pmic/tps80031.txt
@@ -0,0 +1,76 @@
+Texas Instruments, TPS80031/TPS80032 PMIC
+
+This device uses two drivers:
+- drivers/power/pmic/tps80031.c (for parent device)
+- drivers/power/regulator/tps80031_regulator.c (for child regulators)
+
+This chapter describes the binding info for the PMIC driver and regulators.
+
+Required properties for PMIC:
+- compatible: "ti,tps80031" or "ti,tps80032"
+- reg: 0x48
+
+With those two properties, the pmic device can be used for read/write only.
+To bind each regulator, the optional regulators subnode should exists.
+
+Optional subnode:
+- name: regulators (subnode list of each device's regulator)
+
+Regulators subnode contains set on supported regulators.
+
+Required properties:
+- regulator-name: used for regulator uclass platform data '.name',
+
+List of supported regulator nodes names for tps80031/tps80032:
+- smps1, smps2, smps3, smps4, smps5
+- ldo1, ldo2, ldo3, ldo4, ldo5, ldo6, ldo7, ldoln, ldousb
+
+SMPS5 in Linux 3.1.10 is referred as vio, but datasheet clearly names it SMPS5.
+
+Optional:
+- regulator-min-microvolt: minimum allowed Voltage to set
+- regulator-max-microvolt: minimum allowed Voltage to set
+- regulator-always-on: regulator should be never disabled
+- regulator-boot-on: regulator should be enabled by the bootloader
+
+Example:
+
+tps80032@48 {
+	compatible = "ti,tps80032";
+	reg = <0x48>;
+
+	regulators {
+		smps1 {
+			regulator-name = "vdd_cpu";
+			regulator-min-microvolt = <800000>;
+			regulator-max-microvolt = <1250000>;
+			regulator-always-on;
+			regulator-boot-on;
+		};
+
+		...
+
+		smps5 {
+			regulator-name = "vdd_1v8_gen";
+			regulator-min-microvolt = <1800000>;
+			regulator-max-microvolt = <1800000>;
+			regulator-always-on;
+			regulator-boot-on;
+		};
+
+		ldo1 {
+			regulator-name = "avdd_dsi_csi";
+			regulator-min-microvolt = <1200000>;
+			regulator-max-microvolt = <1200000>;
+			regulator-boot-on;
+		};
+
+		...
+
+		ldousb {
+			regulator-name = "avdd_usb";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+		};
+	};
+};
diff --git a/drivers/power/pmic/Kconfig b/drivers/power/pmic/Kconfig
index 54665d7..454a6e0 100644
--- a/drivers/power/pmic/Kconfig
+++ b/drivers/power/pmic/Kconfig
@@ -351,6 +351,17 @@ config DM_PMIC_TPS65910
 	DC-DC converter, 8 LDOs and a RTC. This driver binds the SMPS and LDO
 	pmic children.
 
+config DM_PMIC_TPS80031
+	bool "Enable driver for Texas Instruments TPS80031/TPS80032 PMIC"
+	---help---
+	This config enables implementation of driver-model pmic uclass features
+	for TPS80031/TPS80032 PMICs. The driver implements read/write operations.
+	This is a Power Management IC with a decent set of peripherals from which
+	5 Buck Converters refered as Switched-mode power supply (SMPS), 11 General-
+	Purpose Low-Dropout Voltage Regulators (LDO), USB OTG Module, Real-Time
+	Clock (RTC) with Timer and Alarm Wake-Up, Two Digital PWM Outputs and more
+	with I2C Compatible Interface. PMIC occupies 4 I2C addresses.
+
 config PMIC_STPMIC1
 	bool "Enable support for STMicroelectronics STPMIC1 PMIC"
 	depends on DM_I2C
diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index 414a9d8..55ee614 100644
--- a/drivers/power/pmic/Makefile
+++ b/drivers/power/pmic/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_$(SPL_)PMIC_RN5T567) += rn5t567.o
 obj-$(CONFIG_PMIC_TPS65090) += tps65090.o
 obj-$(CONFIG_PMIC_S5M8767) += s5m8767.o
 obj-$(CONFIG_DM_PMIC_TPS65910) += pmic_tps65910_dm.o
+obj-$(CONFIG_$(SPL_)DM_PMIC_TPS80031) += tps80031.o
 obj-$(CONFIG_$(SPL_)PMIC_PALMAS) += palmas.o
 obj-$(CONFIG_$(SPL_)PMIC_LP873X) += lp873x.o
 obj-$(CONFIG_$(SPL_)PMIC_LP87565) += lp87565.o
diff --git a/drivers/power/pmic/tps80031.c b/drivers/power/pmic/tps80031.c
new file mode 100644
index 0000000..6b36ebb
--- /dev/null
+++ b/drivers/power/pmic/tps80031.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Copyright(C) 2023 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#include <dm.h>
+#include <dm/lists.h>
+#include <power/pmic.h>
+#include <power/tps80031.h>
+
+static const struct pmic_child_info pmic_children_info[] = {
+	{ .prefix = "ldo", .driver = TPS80031_LDO_DRIVER },
+	{ .prefix = "smps", .driver = TPS80031_SMPS_DRIVER },
+	{ },
+};
+
+static int tps80031_write(struct udevice *dev, uint reg, const uint8_t *buff,
+			  int len)
+{
+	int ret;
+
+	ret = dm_i2c_write(dev, reg, buff, len);
+	if (ret) {
+		log_debug("write error to device: %p register: %#x!\n", dev, reg);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int tps80031_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
+{
+	int ret;
+
+	ret = dm_i2c_read(dev, reg, buff, len);
+	if (ret) {
+		log_debug("read error from device: %p register: %#x!\n", dev, reg);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int tps80031_bind(struct udevice *dev)
+{
+	ofnode regulators_node;
+	int children;
+
+	regulators_node = dev_read_subnode(dev, "regulators");
+	if (!ofnode_valid(regulators_node)) {
+		log_err("%s regulators subnode not found!\n", dev->name);
+		return -ENXIO;
+	}
+
+	debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
+
+	children = pmic_bind_children(dev, regulators_node, pmic_children_info);
+	if (!children)
+		log_err("%s - no child found\n", dev->name);
+
+	/* Always return success for this device */
+	return 0;
+}
+
+static struct dm_pmic_ops tps80031_ops = {
+	.read = tps80031_read,
+	.write = tps80031_write,
+};
+
+static const struct udevice_id tps80031_ids[] = {
+	{ .compatible = "ti,tps80031" },
+	{ .compatible = "ti,tps80032" },
+	{ }
+};
+
+U_BOOT_DRIVER(pmic_tps80031) = {
+	.name = "tps80031_pmic",
+	.id = UCLASS_PMIC,
+	.of_match = tps80031_ids,
+	.bind = tps80031_bind,
+	.ops = &tps80031_ops,
+};
diff --git a/include/power/tps80031.h b/include/power/tps80031.h
new file mode 100644
index 0000000..c80692a
--- /dev/null
+++ b/include/power/tps80031.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ *  Copyright(C) 2023 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#ifndef _TPS80031_H_
+#define _TPS80031_H_
+
+#define TPS80031_LDO_NUM		9
+#define TPS80031_SMPS_NUM		5
+
+/* Drivers name */
+#define TPS80031_LDO_DRIVER		"tps80031_ldo"
+#define TPS80031_SMPS_DRIVER		"tps80031_smps"
+
+#define TPS80031_SMPS_OFFSET		0xe0
+#define TPS80031_OFFSET_FLAG		BIT(0)
+
+#define REGULATOR_STATUS_MASK		0x3
+#define REGULATOR_MODE_ON		0x1
+
+/* Switched-Mode Power Supply Regulator calculations */
+#define SMPS_VOLT_MASK			0x3f
+#define SMPS_VOLT_LINEAR_HEX		0x39
+#define SMPS_VOLT_NLINEAR_HEX		0x3a
+#define SMPS_VOLT_LINEAR		1300000
+#define SMPS_VOLT_BASE			600000
+#define SMPS_VOLT_BASE_OFFSET		700000
+
+/* Low-Dropout Linear (LDO) Regulator calculations */
+#define LDO_VOLT_MASK			0x3f
+#define LDO_VOLT_MAX_HEX		0x18
+#define LDO_VOLT_MIN_HEX		0x01
+#define LDO_VOLT_MAX			3360000
+#define LDO_VOLT_MIN			1018000
+#define LDO_VOLT_BASE			916000
+
+/* register groups */
+enum {
+	CTRL,
+	VOLT,
+	OFFSET,
+};
+
+#endif /* _TPS80031_H_ */