This patch adds a regulator driver for the MCP16502 PMIC.
This drivers supports basic operations through the
regulator interface such as:
- setting/reading voltage
- setting/reading operating mode
- reading current status
- transitioning to/from suspend-to-ram and standby
power states
Signed-off-by: Andrei Stefanescu
---
drivers/regulator/Kconfig| 9 +
drivers/regulator/Makefile | 1 +
drivers/regulator/mcp16502.c | 542 +++
3 files changed, 552 insertions(+)
create mode 100644 drivers/regulator/mcp16502.c
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 926cee0..719d9d6 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -567,6 +567,15 @@ config REGULATOR_MC13892
Say y here to support the regulators found on the Freescale MC13892
PMIC.
+config REGULATOR_MCP16502
+ tristate "Microchip MCP16502 PMIC"
+ depends on I2C && OF
+ help
+ Say y here to support the MCP16502 PMIC. This driver supports
+ basic operations (get/set voltage, get/set operating mode)
+ through the regulator interface. In addition it enables
+ suspend-to-ram/standby transition.
+
config REGULATOR_MT6311
tristate "MediaTek MT6311 PMIC"
depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 72488ef..b12e1c9 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -74,6 +74,7 @@ obj-$(CONFIG_REGULATOR_MAX77802) += max77802-regulator.o
obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
obj-$(CONFIG_REGULATOR_MC13XXX_CORE) += mc13xxx-regulator-core.o
+obj-$(CONFIG_REGULATOR_MCP16502) += mcp16502.o
obj-$(CONFIG_REGULATOR_MT6311) += mt6311-regulator.o
obj-$(CONFIG_REGULATOR_MT6323) += mt6323-regulator.o
obj-$(CONFIG_REGULATOR_MT6380) += mt6380-regulator.o
diff --git a/drivers/regulator/mcp16502.c b/drivers/regulator/mcp16502.c
new file mode 100644
index 000..b623fb0
--- /dev/null
+++ b/drivers/regulator/mcp16502.c
@@ -0,0 +1,542 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * MCP16502 PMIC driver
+ *
+ * Copyright (C) 2018 Microchip Technology Inc. and its subsidiaries
+ *
+ * Author: Andrei Stefanescu
+ *
+ * Inspired from tps65086-regulator.c
+ */
+
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+
+#define VDD_LOW_SEL 0x0D
+#define VDD_HIGH_SEL 0x3F
+
+#define MCP16502_FLT BIT(7)
+#define MCP16502_ENS BIT(0)
+
+/*
+ *
+ * The PMIC has four sets of registers corresponding to four power modes:
+ * Performance, Active, Low-power, Hibernate.
+ *
+ * Registers:
+ * Each regulator has a register for each power mode. To access a register
+ * for a specific regulator and mode BASE_* and OFFSET_* need to be added.
+ *
+ * Operating modes:
+ * In order for the PMIC to transition to operating modes it has to be
+ * controlled via GPIO lines called LPM and HPM.
+ *
+ * The registers are fully configurable such that you can put all regulators in
+ * a low-power state while the PMIC is in Active mode. They are supposed to be
+ * configured at startup and then simply transition to/from a global low-power
+ * state by setting the GPIO lpm pin high/low.
+ *
+ * This driver keeps the PMIC in Active mode, Low-power state is set for the
+ * regulators by enabling/disabling operating mode (FPWM or Auto PFM).
+ *
+ * The PMIC's Low-power and Hibernate modes are used during standby/suspend.
+ * To enter standby/suspend the PMIC will go to Low-power mode. From there, it
+ * will transition to Hibernate when the PWRHLD line is set to low by the MPU.
+ */
+
+/*
+ * This function is useful for iterating over all regulators and accessing
their
+ * registers in a generic way or accessing a regulator device by its id.
+ */
+#define MCP16502_BASE(i) (((i) + 1) << 4)
+#define MCP16502_STAT_BASE(i) ((i) + 5)
+
+#define MCP16502_OFFSET_MODE_A 0
+#define MCP16502_OFFSET_MODE_LPM 1
+#define MCP16502_OFFSET_MODE_HIB 2
+
+#define MCP16502_OPMODE_ACTIVE REGULATOR_MODE_NORMAL
+#define MCP16502_OPMODE_LPM REGULATOR_MODE_IDLE
+#define MCP16502_OPMODE_HIB REGULATOR_MODE_STANDBY
+
+#define MCP16502_MODE_AUTO_PFM 0
+#define MCP16502_MODE_FPWM BIT(6)
+
+#define MCP16502_VSEL 0x3F
+#define MCP16502_EN BIT(7)
+#define MCP16502_MODE BIT(6)
+
+#define MCP16502_MIN_REG 0x0
+#define MCP16502_MAX_REG 0x65
+
+static unsigned int mcp16502_of_map_mode(unsigned int mode)
+{
+ if (mode == REGULATOR_MODE_NORMAL || mode == REGULATOR_MODE_IDLE)
+ return mode;
+
+ return REGULATOR_MODE_INVALID;
+}
+
+#define MCP16502_REGULATOR(_name, _id, _ranges, _ops) \
+ [_id] = { \
+ .name = _name,\
+ .regulators_node= of_match_ptr("regulators"), \
+ .id
