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Date:   Thu, 31 Aug 2017 01:07:20 +0700
From:   s.abhisit@...il.com
To:     lee.jones@...aro.org
Cc:     linux-kernel@...r.kernel.org, Abhisit Sangjan <s.abhisit@...il.com>
Subject: [PATCH 1/5] lmp92001: mfd: Add support TI LMP92001

From: Abhisit Sangjan <s.abhisit@...il.com>

TI LMP92001 Analog System Monitor and Controller

8-bit GPIOs.
12 DACs with 12-bit resolution.

The GPIOs and DACs are shared port function with Cy function pin to
take control the pin suddenly from external hardware.
DAC's referance voltage selectable for Internal/External.

16 + 1 ADCs with 12-bit resolution.

Built-in internal Temperature Sensor on channel 17.
Window Comparator Function is supported on channel 1-3 and 9-11 for
monitoring with interrupt signal (pending to implement for interrupt).
ADC's referance voltage selectable for Internal/External.

Signed-off-by: Abhisit Sangjan <s.abhisit@...il.com>
---
 drivers/mfd/Kconfig                |  12 ++
 drivers/mfd/Makefile               |   4 +
 drivers/mfd/lmp92001-core.c        | 307 +++++++++++++++++++++++++++++++++++++
 drivers/mfd/lmp92001-debug.c       |  64 ++++++++
 drivers/mfd/lmp92001-i2c.c         | 211 +++++++++++++++++++++++++
 include/linux/mfd/lmp92001/core.h  | 135 ++++++++++++++++
 include/linux/mfd/lmp92001/debug.h |  27 ++++
 7 files changed, 760 insertions(+)
 create mode 100644 drivers/mfd/lmp92001-core.c
 create mode 100644 drivers/mfd/lmp92001-debug.c
 create mode 100644 drivers/mfd/lmp92001-i2c.c
 create mode 100644 include/linux/mfd/lmp92001/core.h
 create mode 100644 include/linux/mfd/lmp92001/debug.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 94ad2c1c3d90..a20389a30cf8 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1528,6 +1528,18 @@ config MFD_LM3533
 	  additional drivers must be enabled in order to use the LED,
 	  backlight or ambient-light-sensor functionality of the device.
 
+config MFD_LMP92001
+       tristate "TI LMP92001 Analog System Monitor and Controller"
+       depends on I2C
+       select MFD_CORE
+       select REGMAP_I2C
+       help
+         Say yes here to enable support for TI LMP92001 Analog System
+         Monitor and Controller
+
+         This driver provide support for 16 ADC, 12 DAC, Voltage Reference,
+         Analog Temperature Sensor and 8-bit GPIO Port.
+
 config MFD_TIMBERDALE
 	tristate "Timberdale FPGA"
 	select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 080793b3fd0e..20d2e65d503a 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -199,6 +199,10 @@ obj-$(CONFIG_MFD_RN5T618)	+= rn5t618.o
 obj-$(CONFIG_MFD_SEC_CORE)	+= sec-core.o sec-irq.o
 obj-$(CONFIG_MFD_SYSCON)	+= syscon.o
 obj-$(CONFIG_MFD_LM3533)	+= lm3533-core.o lm3533-ctrlbank.o
+
+lmp92001-objs			:= lmp92001-core.o lmp92001-i2c.o lmp92001-debug.o
+obj-$(CONFIG_MFD_LMP92001)	+= lmp92001.o
+
 obj-$(CONFIG_MFD_VEXPRESS_SYSREG)	+= vexpress-sysreg.o
 obj-$(CONFIG_MFD_RETU)		+= retu-mfd.o
 obj-$(CONFIG_MFD_AS3711)	+= as3711.o
diff --git a/drivers/mfd/lmp92001-core.c b/drivers/mfd/lmp92001-core.c
new file mode 100644
index 000000000000..5ee315ce61bb
--- /dev/null
+++ b/drivers/mfd/lmp92001-core.c
@@ -0,0 +1,307 @@
+/*
+ * lmp92001-core.c - Device access for TI LMP92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@...il.com>
+ *
+ * Inspired by wm831x driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/mfd/lmp92001/core.h>
+#include <linux/mfd/lmp92001/debug.h>
+
+static const struct mfd_cell lmp92001_devs[] = {
+	{
+		.name = "lmp92001-gpio",
+		.of_compatible = "ti,lmp92001-gpio",
+	},
+	{
+		.name = "lmp92001-adc",
+		.of_compatible = "ti,lmp92001-adc",
+	},
+	{
+		.name = "lmp92001-dac",
+		.of_compatible = "ti,lmp92001-dac",
+	},
+};
+
+static struct reg_default lmp92001_defaults[] = {
+	{ LMP92001_SGEN,  0x40   },
+	{ LMP92001_SHIL,  0x00   },
+	{ LMP92001_SLOL,  0x00   },
+	{ LMP92001_CGEN,  0x00   },
+	{ LMP92001_CDAC,  0x03   },
+	{ LMP92001_CGPO,  0xFF   },
+	{ LMP92001_CINH,  0x00   },
+	{ LMP92001_CINL,  0x00   },
+	{ LMP92001_CAD1,  0x00   },
+	{ LMP92001_CAD2,  0x00   },
+	{ LMP92001_CAD3,  0x00   },
+	{ LMP92001_CTRIG, 0x00   },
+	{ LMP92001_CREF,  0x07   },
+	{ LMP92001_ADC1,  0x0000 },
+	{ LMP92001_ADC2,  0x0000 },
+	{ LMP92001_ADC3,  0x0000 },
+	{ LMP92001_ADC4,  0x0000 },
+	{ LMP92001_ADC5,  0x0000 },
+	{ LMP92001_ADC6,  0x0000 },
+	{ LMP92001_ADC7,  0x0000 },
+	{ LMP92001_ADC8,  0x0000 },
+	{ LMP92001_ADC9,  0x0000 },
+	{ LMP92001_ADC10, 0x0000 },
+	{ LMP92001_ADC11, 0x0000 },
+	{ LMP92001_ADC12, 0x0000 },
+	{ LMP92001_ADC13, 0x0000 },
+	{ LMP92001_ADC14, 0x0000 },
+	{ LMP92001_ADC15, 0x0000 },
+	{ LMP92001_ADC16, 0x0000 },
+	{ LMP92001_LIH1,  0x0FFF },
+	{ LMP92001_LIH2,  0x0FFF },
+	{ LMP92001_LIH3,  0x0FFF },
+	{ LMP92001_LIH9,  0x0FFF },
+	{ LMP92001_LIH10, 0x0FFF },
+	{ LMP92001_LIH11, 0x0FFF },
+	{ LMP92001_LIL1,  0x0000 },
+	{ LMP92001_LIL2,  0x0000 },
+	{ LMP92001_LIL3,  0x0000 },
+	{ LMP92001_LIL9,  0x0000 },
+	{ LMP92001_LIL10, 0x0000 },
+	{ LMP92001_LIL11, 0x0000 },
+	{ LMP92001_DAC1,  0x0000 },
+	{ LMP92001_DAC2,  0x0000 },
+	{ LMP92001_DAC3,  0x0000 },
+	{ LMP92001_DAC4,  0x0000 },
+	{ LMP92001_DAC5,  0x0000 },
+	{ LMP92001_DAC6,  0x0000 },
+	{ LMP92001_DAC7,  0x0000 },
+	{ LMP92001_DAC8,  0x0000 },
+	{ LMP92001_DAC9,  0x0000 },
+	{ LMP92001_DAC10, 0x0000 },
+	{ LMP92001_DAC11, 0x0000 },
+	{ LMP92001_DAC12, 0x0000 },
+	{ LMP92001_DALL,  0x0000 },
+};
+
+static bool lmp92001_reg_readable(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case LMP92001_ID:
+	case LMP92001_VER:
+	case LMP92001_SGEN:
+	case LMP92001_SGPI:
+	case LMP92001_SHIL:
+	case LMP92001_SLOL:
+	case LMP92001_CGEN:
+	case LMP92001_CDAC:
+	case LMP92001_CGPO:
+	case LMP92001_CINH:
+	case LMP92001_CINL:
+	case LMP92001_CAD1:
+	case LMP92001_CAD2:
+	case LMP92001_CAD3:
+	case LMP92001_ADC1:
+	case LMP92001_ADC2:
+	case LMP92001_ADC3:
+	case LMP92001_ADC4:
+	case LMP92001_ADC5:
+	case LMP92001_ADC6:
+	case LMP92001_ADC7:
+	case LMP92001_ADC8:
+	case LMP92001_ADC9:
+	case LMP92001_ADC10:
+	case LMP92001_ADC11:
+	case LMP92001_ADC12:
+	case LMP92001_ADC13:
+	case LMP92001_ADC14:
+	case LMP92001_ADC15:
+	case LMP92001_ADC16:
+	case LMP92001_ADC17:
+	case LMP92001_LIH1:
+	case LMP92001_LIH2:
+	case LMP92001_LIH3:
+	case LMP92001_LIH9:
+	case LMP92001_LIH10:
+	case LMP92001_LIH11:
+	case LMP92001_LIL1:
+	case LMP92001_LIL2:
+	case LMP92001_LIL3:
+	case LMP92001_LIL9:
+	case LMP92001_LIL10:
+	case LMP92001_LIL11:
+	case LMP92001_CREF:
+	case LMP92001_DAC1:
+	case LMP92001_DAC2:
+	case LMP92001_DAC3:
+	case LMP92001_DAC4:
+	case LMP92001_DAC5:
+	case LMP92001_DAC6:
+	case LMP92001_DAC7:
+	case LMP92001_DAC8:
+	case LMP92001_DAC9:
+	case LMP92001_DAC10:
+	case LMP92001_DAC11:
+	case LMP92001_DAC12:
+	case LMP92001_BLK0:
+	case LMP92001_BLK1:
+	case LMP92001_BLK2:
+	case LMP92001_BLK3:
+	case LMP92001_BLK4:
+	case LMP92001_BLK5:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool lmp92001_reg_writeable(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case LMP92001_CGEN:
+	case LMP92001_CDAC:
+	case LMP92001_CGPO:
+	case LMP92001_CINH:
+	case LMP92001_CINL:
+	case LMP92001_CAD1:
+	case LMP92001_CAD2:
+	case LMP92001_CAD3:
+	case LMP92001_CTRIG:
+	case LMP92001_LIH1:
+	case LMP92001_LIH2:
+	case LMP92001_LIH3:
+	case LMP92001_LIH9:
+	case LMP92001_LIH10:
+	case LMP92001_LIH11:
+	case LMP92001_LIL1:
+	case LMP92001_LIL2:
+	case LMP92001_LIL3:
+	case LMP92001_LIL9:
+	case LMP92001_LIL10:
+	case LMP92001_LIL11:
+	case LMP92001_CREF:
+	case LMP92001_DAC1:
+	case LMP92001_DAC2:
+	case LMP92001_DAC3:
+	case LMP92001_DAC4:
+	case LMP92001_DAC5:
+	case LMP92001_DAC6:
+	case LMP92001_DAC7:
+	case LMP92001_DAC8:
+	case LMP92001_DAC9:
+	case LMP92001_DAC10:
+	case LMP92001_DAC11:
+	case LMP92001_DAC12:
+	case LMP92001_DALL:
+	case LMP92001_BLK0:
+	case LMP92001_BLK1:
+	case LMP92001_BLK4:
+	case LMP92001_BLK5:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool lmp92001_reg_volatile(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case LMP92001_SGEN:
+	case LMP92001_SGPI:
+	case LMP92001_SHIL:
+	case LMP92001_SLOL:
+	case LMP92001_CGEN:
+	case LMP92001_ADC1:
+	case LMP92001_ADC2:
+	case LMP92001_ADC3:
+	case LMP92001_ADC4:
+	case LMP92001_ADC5:
+	case LMP92001_ADC6:
+	case LMP92001_ADC7:
+	case LMP92001_ADC8:
+	case LMP92001_ADC9:
+	case LMP92001_ADC10:
+	case LMP92001_ADC11:
+	case LMP92001_ADC12:
+	case LMP92001_ADC13:
+	case LMP92001_ADC14:
+	case LMP92001_ADC15:
+	case LMP92001_ADC16:
+	case LMP92001_ADC17:
+	case LMP92001_BLK2:
+	case LMP92001_BLK3:
+		return true;
+	default:
+		return false;
+	}
+}
+
+struct regmap_config lmp92001_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 16,
+
+	.cache_type = REGCACHE_RBTREE,
+
+	.reg_defaults = lmp92001_defaults,
+	.num_reg_defaults = ARRAY_SIZE(lmp92001_defaults),
+
+	.max_register = LMP92001_BLK5,
+	.readable_reg = lmp92001_reg_readable,
+	.writeable_reg = lmp92001_reg_writeable,
+	.volatile_reg = lmp92001_reg_volatile,
+};
+
+int lmp92001_device_init(struct lmp92001 *lmp92001, unsigned long id, int irq)
+{
+	int ret;
+	unsigned int comid, ver;
+
+	dev_set_drvdata(lmp92001->dev, lmp92001);
+
+	ret = regmap_read(lmp92001->regmap, LMP92001_ID, &comid);
+	if (ret < 0) {
+		dev_err(lmp92001->dev, "failed to read Company ID: %d\n", ret);
+		goto exit;
+	}
+
+	ret = regmap_read(lmp92001->regmap, LMP92001_VER, &ver);
+	if (ret < 0) {
+		dev_err(lmp92001->dev, "failed to read Version: %d\n", ret);
+		goto exit;
+	}
+
+	dev_info(lmp92001->dev, "Company ID 0x%.2x, Version 0x%.2x\n",
+			comid, ver);
+
+	ret = mfd_add_devices(lmp92001->dev, PLATFORM_DEVID_AUTO,
+				lmp92001_devs, ARRAY_SIZE(lmp92001_devs),
+				NULL, 0, NULL);
+	if (ret != 0) {
+		dev_err(lmp92001->dev, "failed to add children\n");
+		goto exit;
+	}
+
+	ret = lmp92001_debug_init(lmp92001);
+	if (ret < 0) {
+		dev_err(lmp92001->dev, "failed to initial debug fs.\n");
+		goto exit;
+	}
+
+exit:
+	return ret;
+}
+
+void lmp92001_device_exit(struct lmp92001 *lmp92001)
+{
+	lmp92001_debug_exit(lmp92001);
+	mfd_remove_devices(lmp92001->dev);
+}
diff --git a/drivers/mfd/lmp92001-debug.c b/drivers/mfd/lmp92001-debug.c
new file mode 100644
index 000000000000..b1746dc810b3
--- /dev/null
+++ b/drivers/mfd/lmp92001-debug.c
@@ -0,0 +1,64 @@
+/*
+ * lmp92001-debug.c - Debug file system for TI LMP92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@...il.com>
+ *
+ * Inspired by wm831x driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+
+#include <linux/mfd/lmp92001/core.h>
+
+static ssize_t lmp92001_id_ver_show(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct lmp92001 *lmp92001 = dev_get_drvdata(dev);
+	int ret;
+	unsigned int comid, ver;
+
+	ret = regmap_read(lmp92001->regmap, LMP92001_ID, &comid);
+	if (ret < 0) {
+		dev_err(lmp92001->dev, "failed to read Company ID: %d\n", ret);
+		return ret;
+	}
+
+	ret = regmap_read(lmp92001->regmap, LMP92001_VER, &ver);
+	if (ret < 0) {
+		dev_err(lmp92001->dev, "failed to read Version: %d\n", ret);
+		return ret;
+	}
+
+	return sprintf(buf, "Company ID 0x%02x (%d), Version 0x%02x (%d)\n",
+			comid, comid, ver, ver);
+}
+static DEVICE_ATTR(lmp92001_id_ver, 0444, lmp92001_id_ver_show, NULL);
+
+int lmp92001_debug_init(struct lmp92001 *lmp92001)
+{
+	int ret;
+
+	ret = device_create_file(lmp92001->dev, &dev_attr_lmp92001_id_ver);
+	if (ret != 0)
+		dev_err(lmp92001->dev,
+			"unique ID attribute is not created: %d\n", ret);
+
+	return ret;
+}
+
+void lmp92001_debug_exit(struct lmp92001 *lmp92001)
+{
+	device_remove_file(lmp92001->dev, &dev_attr_lmp92001_id_ver);
+}
diff --git a/drivers/mfd/lmp92001-i2c.c b/drivers/mfd/lmp92001-i2c.c
new file mode 100644
index 000000000000..e22ea88f5820
--- /dev/null
+++ b/drivers/mfd/lmp92001-i2c.c
@@ -0,0 +1,211 @@
+/*
+ * lmp92001-i2c.c - I2C access for TI LMP92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@...il.com>
+ *
+ * Inspired by wm831x driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/lmp92001/core.h>
+
+static const unsigned short lmp92001_i2c_addresses[] = {
+	0x40, 0x42, 0x44, 0x46, 0x48, 0x4A, 0x4C, 0x4E, 0x50, I2C_CLIENT_END
+};
+
+/* TODO: To read/write block access, it may need to re-ordering endianness! */
+static int lmp92001_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+	struct device *dev = context;
+	struct i2c_client *i2c = to_i2c_client(dev);
+	int ret;
+
+	if (reg > 0xff)
+		return -EINVAL;
+
+	switch (reg) {
+	case LMP92001_ID ... LMP92001_CTRIG:
+	case LMP92001_CREF:
+		*val = ret = i2c_smbus_read_byte_data(i2c, reg);
+		break;
+	case LMP92001_ADC1 ... LMP92001_LIL11:
+	case LMP92001_DAC1 ... LMP92001_DALL:
+		*val = ret = i2c_smbus_read_word_swapped(i2c, reg);
+		break;
+	case LMP92001_BLK0 ... LMP92001_BLK5:
+		ret = i2c_smbus_read_block_data(i2c, reg,
+						(u8 *)((uintptr_t)*val));
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int lmp92001_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+	struct device *dev = context;
+	struct i2c_client *i2c = to_i2c_client(dev);
+	int ret;
+
+	if (reg > 0xff)
+		return -EINVAL;
+
+	switch (reg) {
+	case LMP92001_ID ... LMP92001_CTRIG:
+	case LMP92001_CREF:
+		ret = i2c_smbus_write_byte_data(i2c, reg, val);
+		break;
+	case LMP92001_ADC1 ... LMP92001_LIL11:
+	case LMP92001_DAC1 ... LMP92001_DALL:
+		ret = i2c_smbus_write_word_swapped(i2c, reg, val);
+		break;
+	/* To call this function/case, must be passed val as pointer */
+	case LMP92001_BLK0:
+	case LMP92001_BLK4:
+		ret = i2c_smbus_write_block_data(i2c, reg, 24,
+						(u8 *)((uintptr_t)val));
+		break;
+	case LMP92001_BLK1:
+	case LMP92001_BLK5:
+		ret = i2c_smbus_write_block_data(i2c, reg, 12,
+						(u8 *)((uintptr_t)val));
+		break;
+	case LMP92001_BLK2:
+		ret = i2c_smbus_write_block_data(i2c, reg, 34,
+						(u8 *)((uintptr_t)val));
+		break;
+	case LMP92001_BLK3:
+		ret = i2c_smbus_write_block_data(i2c, reg, 18,
+						(u8 *)((uintptr_t)val));
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return ret;
+}
+
+static int lmp92001_i2c_probe(struct i2c_client *i2c,
+	const struct i2c_device_id *id)
+{
+	struct lmp92001 *lmp92001;
+	int ret;
+
+	lmp92001 = devm_kzalloc(&i2c->dev, sizeof(struct lmp92001), GFP_KERNEL);
+	if (!lmp92001)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, lmp92001);
+	lmp92001->dev = &i2c->dev;
+
+	lmp92001_regmap_config.reg_read = lmp92001_reg_read;
+	lmp92001_regmap_config.reg_write = lmp92001_reg_write;
+
+	lmp92001->regmap = devm_regmap_init(&i2c->dev, NULL, &i2c->dev,
+						&lmp92001_regmap_config);
+	if (IS_ERR(lmp92001->regmap)) {
+		ret = PTR_ERR(lmp92001->regmap);
+		dev_err(lmp92001->dev, "failed to allocate register map: %d\n",
+				ret);
+		return ret;
+	}
+
+	return lmp92001_device_init(lmp92001, id->driver_data, i2c->irq);
+}
+
+static int lmp92001_i2c_remove(struct i2c_client *i2c)
+{
+	struct lmp92001 *lmp92001 = i2c_get_clientdata(i2c);
+
+	lmp92001_device_exit(lmp92001);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id lmp92001_dt_ids[] = {
+	{ .compatible = "ti,lmp92001", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, lmp92001_dt_ids);
+#endif
+
+static const struct i2c_device_id lmp92001_i2c_ids[] = {
+	{ "lmp92001" },
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, lmp92001_i2c_ids);
+
+static int lmp92001_i2c_detect(struct i2c_client *i2c,
+	struct i2c_board_info *info)
+{
+	struct i2c_adapter *adapter = i2c->adapter;
+	s32 comid, ver;
+
+	if (!i2c_check_functionality(adapter,
+					I2C_FUNC_SMBUS_BYTE_DATA |
+					I2C_FUNC_SMBUS_WORD_DATA |
+					I2C_FUNC_SMBUS_BLOCK_DATA))
+		return -ENODEV;
+
+	comid = i2c_smbus_read_byte_data(i2c, LMP92001_ID);
+	ver = i2c_smbus_read_byte_data(i2c, LMP92001_VER);
+
+	if (comid != 0x01 || ver != 0x10)
+		return -ENODEV;
+
+	return 0;
+}
+
+static struct i2c_driver lmp92001_i2c_driver = {
+	.driver = {
+		.name = "lmp92001",
+		.of_match_table = of_match_ptr(lmp92001_dt_ids),
+	},
+	.probe		= lmp92001_i2c_probe,
+	.remove		= lmp92001_i2c_remove,
+	.id_table	= lmp92001_i2c_ids,
+	.detect		= lmp92001_i2c_detect,
+	.address_list	= lmp92001_i2c_addresses,
+};
+
+static int __init lmp92001_i2c_init(void)
+{
+	return i2c_add_driver(&lmp92001_i2c_driver);
+}
+subsys_initcall(lmp92001_i2c_init);
+
+static void __exit lmp92001_i2c_exit(void)
+{
+	i2c_del_driver(&lmp92001_i2c_driver);
+}
+module_exit(lmp92001_i2c_exit);
+
+MODULE_DESCRIPTION("i2c driver for TI LMP92001");
+MODULE_AUTHOR("Abhisit Sangjan <s.abhisit@...il.com>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/lmp92001/core.h b/include/linux/mfd/lmp92001/core.h
new file mode 100644
index 000000000000..81aabf8b8e7a
--- /dev/null
+++ b/include/linux/mfd/lmp92001/core.h
@@ -0,0 +1,135 @@
+/*
+ * include/linux/mfd/lmp92001/core.h - Core interface for TI LMP92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@...il.com>
+ *
+ * Inspired by wm831x driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __MFD_LMP92001_CORE_H__
+#define __MFD_LMP92001_CORE_H__
+
+#include <linux/device.h>
+#include <linux/mfd/core.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+
+/*
+ * Register values.
+ */
+/* ID */
+#define LMP92001_ID	0x0E
+#define LMP92001_VER	0x0F
+/* STATUS */
+#define LMP92001_SGEN	0x10
+#define LMP92001_SGPI	0x11
+#define LMP92001_SHIL	0x12
+#define LMP92001_SLOL	0x13
+/* CONTROL */
+#define LMP92001_CGEN	0x14
+#define LMP92001_CDAC	0x15
+#define LMP92001_CGPO	0x16
+#define LMP92001_CINH	0x17
+#define LMP92001_CINL	0x18
+#define LMP92001_CAD1	0x19
+#define LMP92001_CAD2	0x1A
+#define LMP92001_CAD3	0x1B
+#define LMP92001_CTRIG	0x1C
+/* ADC OUTPUT DATA */
+#define LMP92001_ADC1	0x20
+#define LMP92001_ADC2	0x21
+#define LMP92001_ADC3	0x22
+#define LMP92001_ADC4	0x23
+#define LMP92001_ADC5	0x24
+#define LMP92001_ADC6	0x25
+#define LMP92001_ADC7	0x26
+#define LMP92001_ADC8	0x27
+#define LMP92001_ADC9	0x28
+#define LMP92001_ADC10	0x29
+#define LMP92001_ADC11	0x2A
+#define LMP92001_ADC12	0x2B
+#define LMP92001_ADC13	0x2C
+#define LMP92001_ADC14	0x2D
+#define LMP92001_ADC15	0x2E
+#define LMP92001_ADC16	0x2F
+#define LMP92001_ADC17	0x30
+/* ADC WINDOW COMPARATOR LIMITS */
+#define LMP92001_LIH1	0x40
+#define LMP92001_LIH2	0x41
+#define LMP92001_LIH3	0x42
+#define LMP92001_LIH9	0x43
+#define LMP92001_LIH10	0x44
+#define LMP92001_LIH11	0x45
+#define LMP92001_LIL1	0x46
+#define LMP92001_LIL2	0x47
+#define LMP92001_LIL3	0x48
+#define LMP92001_LIL9	0x49
+#define LMP92001_LIL10	0x4A
+#define LMP92001_LIL11	0x4B
+/* INTERNAL REFERENCE CONTROL */
+#define LMP92001_CREF	0x66
+/* DAC INPUT DATA */
+#define LMP92001_DAC1	0x80
+#define LMP92001_DAC2	0x81
+#define LMP92001_DAC3	0x82
+#define LMP92001_DAC4	0x83
+#define LMP92001_DAC5	0x84
+#define LMP92001_DAC6	0x85
+#define LMP92001_DAC7	0x86
+#define LMP92001_DAC8	0x87
+#define LMP92001_DAC9	0x88
+#define LMP92001_DAC10	0x89
+#define LMP92001_DAC11	0x8A
+#define LMP92001_DAC12	0x8B
+#define LMP92001_DALL	0x90
+/* MEMORY MAPPED BLOCK COMMANDS */
+#define LMP92001_BLK0	0xF0
+#define LMP92001_BLK1	0xF1
+#define LMP92001_BLK2	0xF2
+#define LMP92001_BLK3	0xF3
+#define LMP92001_BLK4	0xF4
+#define LMP92001_BLK5	0xF5
+
+/*
+ * Helpful macros
+ */
+/* DAC */
+#define CDAC_OFF	BIT(0)
+#define CDAC_OLVL	BIT(1)
+#define CDAC_GANG	BIT(2)
+/* INT. REFERANCE ENABLE */
+#define CREF_DEXT	BIT(0)
+#define CREF_AEXT	BIT(1)
+/* GENERAL */
+#define CGEN_STRT	BIT(0)
+#define CGEN_LCK	BIT(1)
+#define CGEN_RST	BIT(7)
+/* STATUS: GENERNAL */
+#define SGEN_GPI	BIT(0)
+
+struct lmp92001 {
+	struct device *dev;
+	struct regmap *regmap;
+
+	struct mutex adc_lock;
+	struct mutex dac_lock;
+};
+
+extern struct regmap_config lmp92001_regmap_config;
+
+int lmp92001_device_init(struct lmp92001 *lmp92001, unsigned long id, int irq);
+void lmp92001_device_exit(struct lmp92001 *lmp92001);
+
+#endif /* __MFD_LMP92001_CORE_H__ */
diff --git a/include/linux/mfd/lmp92001/debug.h b/include/linux/mfd/lmp92001/debug.h
new file mode 100644
index 000000000000..e6fda7efc917
--- /dev/null
+++ b/include/linux/mfd/lmp92001/debug.h
@@ -0,0 +1,27 @@
+/*
+ * include/linux/mfd/lmp92001/debug.h - Debug interface for TI 92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@...il.com>
+ *
+ * Inspired by wm831x driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __MFD_LMP92001_DEBUG_H__
+#define __MFD_LMP92001_DEBUG_H__
+
+int lmp92001_debug_init(struct lmp92001 *lmp92001);
+void lmp92001_debug_exit(struct lmp92001 *lmp92001);
+
+#endif /* __MFD_LMP92001_DEBUG_H__ */
-- 
2.13.0

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