Add core driver for the ROHM BD79124 ADC / GPO.
The core driver launches the sub-drivers for the pinmux/GPO and for the
IIO ADC. It also provides the regmap, and forwards the IRQ resource to
the ADC.
Signed-off-by: Matti Vaittinen <mazziesaccount@xxxxxxxxx>
---
drivers/mfd/Kconfig | 12 +++
drivers/mfd/Makefile | 1 +
drivers/mfd/rohm-bd79124.c | 165 +++++++++++++++++++++++++++++++
include/linux/mfd/rohm-bd79124.h | 32 ++++++
4 files changed, 210 insertions(+)
create mode 100644 drivers/mfd/rohm-bd79124.c
create mode 100644 include/linux/mfd/rohm-bd79124.h
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index ae23b317a64e..f024256fb180 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -2113,6 +2113,18 @@ config MFD_ROHM_BD71828
also a single-cell linear charger, a Coulomb counter, a real-time
clock (RTC), GPIOs and a 32.768 kHz clock gate.
+config MFD_ROHM_BD79124
+ tristate "Rohm BD79124 core driver"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ Say yes here to build support for the ROHM BD79124 ADC core. The
+ ROHM BD79124 is a 12-bit, 8-channel, SAR ADC. The ADC supports
+ also an automatic measurement mode, with an alarm interrupt for
+ out-of-window measurements. The window is configurable for each
+ channel. The ADC inputs can optionally be used as general purpose
+ outputs.
+
config MFD_ROHM_BD957XMUF
tristate "ROHM BD9576MUF and BD9573MUF Power Management ICs"
depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index e057d6d6faef..c7d64e933a7d 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -270,6 +270,7 @@ obj-$(CONFIG_MFD_SC27XX_PMIC) += sprd-sc27xx-spi.o
obj-$(CONFIG_RAVE_SP_CORE) += rave-sp.o
obj-$(CONFIG_MFD_ROHM_BD71828) += rohm-bd71828.o
obj-$(CONFIG_MFD_ROHM_BD718XX) += rohm-bd718x7.o
+obj-$(CONFIG_MFD_ROHM_BD79124) += rohm-bd79124.o
obj-$(CONFIG_MFD_ROHM_BD957XMUF) += rohm-bd9576.o
obj-$(CONFIG_MFD_ROHM_BD96801) += rohm-bd96801.o
obj-$(CONFIG_MFD_STMFX) += stmfx.o
diff --git a/drivers/mfd/rohm-bd79124.c b/drivers/mfd/rohm-bd79124.c
new file mode 100644
index 000000000000..c35ab0e03b0b
--- /dev/null
+++ b/drivers/mfd/rohm-bd79124.c
@@ -0,0 +1,165 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Copyright (C) 2025 ROHM Semiconductors
+//
+// ROHM BD79124 ADC / GPO driver
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/rohm-bd79124.h>
+
+static struct resource adc_alert;
+
+enum {
+ CELL_PINMUX,
+ CELL_ADC,
+};
+
+static struct mfd_cell bd79124_cells[] = {
+ [CELL_PINMUX] = { .name = "bd79124-pinmux", },
+ [CELL_ADC] = { .name = "bd79124-adc", },
+};
+
+/* Read-only regs */
+static const struct regmap_range bd79124_ro_ranges[] = {
+ {
+ .range_min = BD79124_REG_EVENT_FLAG,
+ .range_max = BD79124_REG_EVENT_FLAG,
+ }, {
+ .range_min = BD79124_REG_RECENT_CH0_LSB,
+ .range_max = BD79124_REG_RECENT_CH7_MSB,
+ },
+};
+
+static const struct regmap_access_table bd79124_ro_regs = {
+ .no_ranges = &bd79124_ro_ranges[0],
+ .n_no_ranges = ARRAY_SIZE(bd79124_ro_ranges),
+};
+
+static const struct regmap_range bd79124_volatile_ranges[] = {
+ {
+ .range_min = BD79124_REG_RECENT_CH0_LSB,
+ .range_max = BD79124_REG_RECENT_CH7_MSB,
+ }, {
+ .range_min = BD79124_REG_EVENT_FLAG,
+ .range_max = BD79124_REG_EVENT_FLAG,
+ }, {
+ .range_min = BD79124_REG_EVENT_FLAG_HI,
+ .range_max = BD79124_REG_EVENT_FLAG_HI,
+ }, {
+ .range_min = BD79124_REG_EVENT_FLAG_LO,
+ .range_max = BD79124_REG_EVENT_FLAG_LO,
+ }, {
+ .range_min = BD79124_REG_SYSTEM_STATUS,
+ .range_max = BD79124_REG_SYSTEM_STATUS,
+ },
+};
+
+static const struct regmap_access_table bd79124_volatile_regs = {
+ .yes_ranges = &bd79124_volatile_ranges[0],
+ .n_yes_ranges = ARRAY_SIZE(bd79124_volatile_ranges),
+};
+
+static const struct regmap_range bd79124_precious_ranges[] = {
+ {
+ .range_min = BD79124_REG_EVENT_FLAG_HI,
+ .range_max = BD79124_REG_EVENT_FLAG_HI,
+ }, {
+ .range_min = BD79124_REG_EVENT_FLAG_LO,
+ .range_max = BD79124_REG_EVENT_FLAG_LO,
+ },
+};
+
+static const struct regmap_access_table bd79124_precious_regs = {
+ .yes_ranges = &bd79124_precious_ranges[0],
+ .n_yes_ranges = ARRAY_SIZE(bd79124_precious_ranges),
+};
+
+static const struct regmap_config bd79124_regmap = {
+ .reg_bits = 16,
+ .val_bits = 8,
+ .read_flag_mask = BD79124_I2C_MULTI_READ,
+ .write_flag_mask = BD79124_I2C_MULTI_WRITE,
+ .max_register = BD79124_REG_MAX,
+ .cache_type = REGCACHE_MAPLE,
+ .volatile_table = &bd79124_volatile_regs,
+ .wr_table = &bd79124_ro_regs,
+ .precious_table = &bd79124_precious_regs,
+};
+
+static int bd79124_probe(struct i2c_client *i2c)
+{
+ int ret;
+ struct regmap *map;
+ struct device *dev = &i2c->dev;
+ int *adc_vref;
+
+ adc_vref = devm_kzalloc(dev, sizeof(*adc_vref), GFP_KERNEL);
+ if (!adc_vref)
+ return -ENOMEM;
+
+ /*
+ * Better to enable regulators here so we don't need to worry about the
+ * order of sub-device instantiation. We also need to deliver the
+ * reference voltage value to the ADC driver. This is done via
+ * the MFD driver's drvdata.
+ */
+ *adc_vref = devm_regulator_get_enable_read_voltage(dev, "vdd");
+ if (*adc_vref < 0)
+ return dev_err_probe(dev, ret, "Failed to get the Vdd\n");
+
+ dev_set_drvdata(dev, adc_vref);
+
+ ret = devm_regulator_get_enable(dev, "iovdd");
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "Failed to enable I/O voltage\n");
+
+ map = devm_regmap_init_i2c(i2c, &bd79124_regmap);
+ if (IS_ERR(map))
+ return dev_err_probe(dev, PTR_ERR(map),
+ "Failed to initialize Regmap\n");
+
+ if (i2c->irq) {
+ adc_alert = DEFINE_RES_IRQ_NAMED(i2c->irq, "thresh-alert");
+ bd79124_cells[CELL_ADC].resources = &adc_alert;
+ bd79124_cells[CELL_ADC].num_resources = 1;
+ }
+
+ ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, bd79124_cells,
+ ARRAY_SIZE(bd79124_cells), NULL, 0, NULL);
+ if (ret)
+ dev_err_probe(dev, ret, "Failed to create subdevices\n");
+
+ return ret;
+}
+
+static const struct of_device_id bd79124_of_match[] = {
+ { .compatible = "rohm,bd79124" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, bd79124_of_match);
+
+static const struct i2c_device_id bd79124_id[] = {
+ { "bd79124", },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, bd79124_id);
+
+static struct i2c_driver bd79124_driver = {
+ .driver = {
+ .name = "bd79124",
+ .of_match_table = bd79124_of_match,
+ },
+ .probe = bd79124_probe,
+ .id_table = bd79124_id,
+};
+module_i2c_driver(bd79124_driver);
+
+MODULE_AUTHOR("Matti Vaittinen <mazziesaccount@xxxxxxxxx>");
+MODULE_DESCRIPTION("Core Driver for ROHM BD79124");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/rohm-bd79124.h b/include/linux/mfd/rohm-bd79124.h
new file mode 100644
index 000000000000..505faeb6f135
--- /dev/null
+++ b/include/linux/mfd/rohm-bd79124.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright 2021 ROHM Semiconductors.
+ *
+ * Author: Matti Vaittinen <matti.vaittinen@xxxxxxxxxxxxxxxxx>
+ */
+
+#ifndef _MFD_BD79124_H
+#define _MFD_BD79124_H
+
+#define BD79124_I2C_MULTI_READ 0x30
+#define BD79124_I2C_MULTI_WRITE 0x28
+#define BD79124_REG_MAX 0xaf
+
+#define BD79124_REG_SYSTEM_STATUS 0x0
+#define BD79124_REG_GEN_CFG 0x01
+#define BD79124_REG_OPMODE_CFG 0x04
+#define BD79124_REG_PINCFG 0x05
+#define BD79124_REG_GPO_VAL 0x06
+#define BD79124_REG_SEQUENCE_CFG 0x10
+#define BD79124_REG_MANUAL_CHANNELS 0x11
+#define BD79124_REG_AUTO_CHANNELS 0x12
+#define BD79124_REG_ALERT_CH_SEL 0x14
+#define BD79124_REG_EVENT_FLAG 0x18
+#define BD79124_REG_EVENT_FLAG_HI 0x1a
+#define BD79124_REG_EVENT_FLAG_LO 0x1c
+#define BD79124_REG_HYSTERESIS_CH0 0x20
+#define BD79124_REG_EVENTCOUNT_CH0 0x22
+#define BD79124_REG_RECENT_CH0_LSB 0xa0
+#define BD79124_REG_RECENT_CH7_MSB 0xaf
+
+#endif
--
2.48.1
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