pmic: add stpmu1 support

This driver implements register read/write operations for STPMU1.

The STPMU1 PMIC provides 4 BUCKs, 6 LDOs, 1 VREF
and 2 power switches. It is accessed via an I2C interface.
This device is used with STM32MP1 SoCs.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

drivers/power/pmic/Kconfig

@@ -209,3 +209,11 @@ config DM_PMIC_TPS65910
 	The TPS65910 is a PMIC containing 3 buck DC-DC converters, one boost
 	DC-DC converter, 8 LDOs and a RTC. This driver binds the SMPS and LDO
 	pmic children.
+
+config PMIC_STPMU1
+	bool "Enable support for STMicroelectronics STPMU1 PMIC"
+	depends on DM_PMIC && DM_I2C
+	---help---
+	The STPMU1 PMIC provides 4 BUCKs, 6 LDOs, 1 VREF and 2 power switches.
+	It is accessed via an I2C interface. The device is used with STM32MP1
+	SoCs. This driver implements register read/write operations.

drivers/power/pmic/Makefile

@@ -23,6 +23,7 @@ obj-$(CONFIG_DM_PMIC_TPS65910) += pmic_tps65910_dm.o
 obj-$(CONFIG_$(SPL_)PMIC_PALMAS) += palmas.o
 obj-$(CONFIG_$(SPL_)PMIC_LP873X) += lp873x.o
 obj-$(CONFIG_$(SPL_)PMIC_LP87565) += lp87565.o
+obj-$(CONFIG_PMIC_STPMU1) += stpmu1.o
 
 obj-$(CONFIG_POWER_LTC3676) += pmic_ltc3676.o
 obj-$(CONFIG_POWER_MAX77696) += pmic_max77696.o

drivers/power/pmic/stpmu1.c

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/stpmu1.h>
+
+#define STMPU1_NUM_OF_REGS 0x100
+
+static int stpmu1_reg_count(struct udevice *dev)
+{
+	return STMPU1_NUM_OF_REGS;
+}
+
+static int stpmu1_write(struct udevice *dev, uint reg, const uint8_t *buff,
+			int len)
+{
+	int ret;
+
+	ret = dm_i2c_write(dev, reg, buff, len);
+	if (ret)
+		dev_err(dev, "%s: failed to write register %#x :%d",
+			__func__, reg, ret);
+
+	return ret;
+}
+
+static int stpmu1_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
+{
+	int ret;
+
+	ret = dm_i2c_read(dev, reg, buff, len);
+	if (ret)
+		dev_err(dev, "%s: failed to read register %#x : %d",
+			__func__, reg, ret);
+
+	return ret;
+}
+
+static struct dm_pmic_ops stpmu1_ops = {
+	.reg_count = stpmu1_reg_count,
+	.read = stpmu1_read,
+	.write = stpmu1_write,
+};
+
+static const struct udevice_id stpmu1_ids[] = {
+	{ .compatible = "st,stpmu1" },
+	{ }
+};
+
+U_BOOT_DRIVER(pmic_stpmu1) = {
+	.name = "stpmu1_pmic",
+	.id = UCLASS_PMIC,
+	.of_match = stpmu1_ids,
+	.ops = &stpmu1_ops,
+};

include/power/stpmu1.h

@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
+ */
+
+#ifndef __PMIC_STPMU1_H_
+#define __PMIC_STPMU1_H_
+
+#define STPMU1_MASK_RESET_BUCK		0x18
+#define STPMU1_BUCKX_CTRL_REG(buck)	(0x20 + (buck))
+#define STPMU1_VREF_CTRL_REG		0x24
+#define STPMU1_LDOX_CTRL_REG(ldo)	(0x25 + (ldo))
+#define STPMU1_USB_CTRL_REG		0x40
+#define STPMU1_NVM_USER_STATUS_REG	0xb8
+#define STPMU1_NVM_USER_CONTROL_REG	0xb9
+
+#define STPMU1_MASK_RESET_BUCK3		BIT(2)
+
+#define STPMU1_BUCK_EN			BIT(0)
+#define STPMU1_BUCK_MODE		BIT(1)
+#define STPMU1_BUCK_OUTPUT_MASK		GENMASK(7, 2)
+#define STPMU1_BUCK_OUTPUT_SHIFT	2
+#define STPMU1_BUCK2_1200000V		(24 << STPMU1_BUCK_OUTPUT_SHIFT)
+#define STPMU1_BUCK2_1350000V		(30 << STPMU1_BUCK_OUTPUT_SHIFT)
+#define STPMU1_BUCK3_1800000V		(39 << STPMU1_BUCK_OUTPUT_SHIFT)
+
+#define STPMU1_VREF_EN			BIT(0)
+
+#define STPMU1_LDO_EN			BIT(0)
+#define STPMU1_LDO12356_OUTPUT_MASK	GENMASK(6, 2)
+#define STPMU1_LDO12356_OUTPUT_SHIFT	2
+#define STPMU1_LDO3_MODE		BIT(7)
+#define STPMU1_LDO3_DDR_SEL		31
+#define STPMU1_LDO3_1800000		(9 << STPMU1_LDO12356_OUTPUT_SHIFT)
+#define STPMU1_LDO4_UV			3300000
+
+#define STPMU1_USB_BOOST_EN		BIT(0)
+#define STPMU1_USB_PWR_SW_EN		GENMASK(2, 1)
+
+#define STPMU1_NVM_USER_CONTROL_PROGRAM	BIT(0)
+#define STPMU1_NVM_USER_CONTROL_READ	BIT(1)
+
+#define STPMU1_NVM_USER_STATUS_BUSY	BIT(0)
+#define STPMU1_NVM_USER_STATUS_ERROR	BIT(1)
+
+#define STPMU1_DEFAULT_START_UP_DELAY_MS	1
+#define STPMU1_USB_BOOST_START_UP_DELAY_MS	10
+
+enum {
+	STPMU1_BUCK1,
+	STPMU1_BUCK2,
+	STPMU1_BUCK3,
+	STPMU1_BUCK4,
+	STPMU1_MAX_BUCK,
+};
+
+enum {
+	STPMU1_BUCK_MODE_HP,
+	STPMU1_BUCK_MODE_LP,
+};
+
+enum {
+	STPMU1_LDO1,
+	STPMU1_LDO2,
+	STPMU1_LDO3,
+	STPMU1_LDO4,
+	STPMU1_LDO5,
+	STPMU1_LDO6,
+	STPMU1_MAX_LDO,
+};
+
+enum {
+	STPMU1_LDO_MODE_NORMAL,
+	STPMU1_LDO_MODE_BYPASS,
+	STPMU1_LDO_MODE_SINK_SOURCE,
+};
+
+enum {
+	STPMU1_PWR_SW1,
+	STPMU1_PWR_SW2,
+	STPMU1_MAX_PWR_SW,
+};
+
+#endif