mfd: Add ROHM BD9571MWV-M MFD PMIC driver

Add the MFD part of the ROHM BD9571MWV-M PMIC driver and MAINTAINERS
entry. The MFD part only specifies the regmap bits for the PMIC and
binds the subdevs together.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 245 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 42fb90ae3345..79e4ec6f19a8 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -133,6 +133,20 @@ config MFD_BCM590XX
         help
           Support for the BCM590xx PMUs from Broadcom
 
+config MFD_BD9571MWV
+        tristate "ROHM BD9571MWV PMIC"
+        select MFD_CORE
+        select REGMAP_I2C
+        select REGMAP_IRQ
+        depends on I2C
+        help
+          Support for the ROHM BD9571MWV PMIC, which contains single
+          voltage regulator, voltage sampling units, GPIO block and
+          watchdog block.
+
+          This driver can also be built as a module. If so, the module
+          will be called bd9571mwv.
+
 config MFD_AC100
         tristate "X-Powers AC100"
         select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index b80b1a314ca5..21e19a5f3f3c 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_MFD_ACT8945A)	+= act8945a.o
 obj-$(CONFIG_MFD_SM501)         += sm501.o
 obj-$(CONFIG_MFD_ASIC3)         += asic3.o tmio_core.o
 obj-$(CONFIG_MFD_BCM590XX)      += bcm590xx.o
+obj-$(CONFIG_MFD_BD9571MWV)     += bd9571mwv.o
 cros_ec_core-objs               := cros_ec.o
 cros_ec_core-$(CONFIG_ACPI)     += cros_ec_acpi_gpe.o
 obj-$(CONFIG_MFD_CROS_EC)       += cros_ec_core.o
diff --git a/drivers/mfd/bd9571mwv.c b/drivers/mfd/bd9571mwv.c
new file mode 100644
index 000000000000..64e088dfe7b0
--- /dev/null
+++ b/drivers/mfd/bd9571mwv.c
@@ -0,0 +1,230 @@
+/*
+ * ROHM BD9571MWV-M MFD driver
+ *
+ * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether expressed or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License version 2 for more details.
+ *
+ * Based on the TPS65086 driver
+ */
+
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+
+#include <linux/mfd/bd9571mwv.h>
+
+static const struct mfd_cell bd9571mwv_cells[] = {
+        { .name = "bd9571mwv-regulator", },
+        { .name = "bd9571mwv-gpio", },
+};
+
+static const struct regmap_range bd9571mwv_readable_yes_ranges[] = {
+        regmap_reg_range(BD9571MWV_VENDOR_CODE, BD9571MWV_PRODUCT_REVISION),
+        regmap_reg_range(BD9571MWV_AVS_SET_MONI, BD9571MWV_AVS_DVFS_VID(3)),
+        regmap_reg_range(BD9571MWV_VD18_VID, BD9571MWV_VD33_VID),
+        regmap_reg_range(BD9571MWV_DVFS_VINIT, BD9571MWV_DVFS_VINIT),
+        regmap_reg_range(BD9571MWV_DVFS_SETVMAX, BD9571MWV_DVFS_MONIVDAC),
+        regmap_reg_range(BD9571MWV_GPIO_IN, BD9571MWV_GPIO_IN),
+        regmap_reg_range(BD9571MWV_GPIO_INT, BD9571MWV_GPIO_INTMASK),
+        regmap_reg_range(BD9571MWV_INT_INTREQ, BD9571MWV_INT_INTMASK),
+};
+
+static const struct regmap_access_table bd9571mwv_readable_table = {
+        .yes_ranges     = bd9571mwv_readable_yes_ranges,
+        .n_yes_ranges   = ARRAY_SIZE(bd9571mwv_readable_yes_ranges),
+};
+
+static const struct regmap_range bd9571mwv_writable_yes_ranges[] = {
+        regmap_reg_range(BD9571MWV_AVS_VD09_VID(0), BD9571MWV_AVS_VD09_VID(3)),
+        regmap_reg_range(BD9571MWV_DVFS_SETVID, BD9571MWV_DVFS_SETVID),
+        regmap_reg_range(BD9571MWV_GPIO_DIR, BD9571MWV_GPIO_OUT),
+        regmap_reg_range(BD9571MWV_GPIO_INT_SET, BD9571MWV_GPIO_INTMASK),
+        regmap_reg_range(BD9571MWV_INT_INTREQ, BD9571MWV_INT_INTMASK),
+};
+
+static const struct regmap_access_table bd9571mwv_writable_table = {
+        .yes_ranges     = bd9571mwv_writable_yes_ranges,
+        .n_yes_ranges   = ARRAY_SIZE(bd9571mwv_writable_yes_ranges),
+};
+
+static const struct regmap_range bd9571mwv_volatile_yes_ranges[] = {
+        regmap_reg_range(BD9571MWV_GPIO_IN, BD9571MWV_GPIO_IN),
+        regmap_reg_range(BD9571MWV_GPIO_INT, BD9571MWV_GPIO_INT),
+        regmap_reg_range(BD9571MWV_INT_INTREQ, BD9571MWV_INT_INTREQ),
+};
+
+static const struct regmap_access_table bd9571mwv_volatile_table = {
+        .yes_ranges     = bd9571mwv_volatile_yes_ranges,
+        .n_yes_ranges   = ARRAY_SIZE(bd9571mwv_volatile_yes_ranges),
+};
+
+static const struct regmap_config bd9571mwv_regmap_config = {
+        .reg_bits       = 8,
+        .val_bits       = 8,
+        .cache_type     = REGCACHE_RBTREE,
+        .rd_table       = &bd9571mwv_readable_table,
+        .wr_table       = &bd9571mwv_writable_table,
+        .volatile_table = &bd9571mwv_volatile_table,
+        .max_register   = 0xff,
+};
+
+static const struct regmap_irq bd9571mwv_irqs[] = {
+        REGMAP_IRQ_REG(BD9571MWV_IRQ_MD1, 0,
+                       BD9571MWV_INT_INTREQ_MD1_INT),
+        REGMAP_IRQ_REG(BD9571MWV_IRQ_MD2_E1, 0,
+                       BD9571MWV_INT_INTREQ_MD2_E1_INT),
+        REGMAP_IRQ_REG(BD9571MWV_IRQ_MD2_E2, 0,
+                       BD9571MWV_INT_INTREQ_MD2_E2_INT),
+        REGMAP_IRQ_REG(BD9571MWV_IRQ_PROT_ERR, 0,
+                       BD9571MWV_INT_INTREQ_PROT_ERR_INT),
+        REGMAP_IRQ_REG(BD9571MWV_IRQ_GP, 0,
+                       BD9571MWV_INT_INTREQ_GP_INT),
+        REGMAP_IRQ_REG(BD9571MWV_IRQ_128H_OF, 0,
+                       BD9571MWV_INT_INTREQ_128H_OF_INT),
+        REGMAP_IRQ_REG(BD9571MWV_IRQ_WDT_OF, 0,
+                       BD9571MWV_INT_INTREQ_WDT_OF_INT),
+        REGMAP_IRQ_REG(BD9571MWV_IRQ_BKUP_TRG, 0,
+                       BD9571MWV_INT_INTREQ_BKUP_TRG_INT),
+};
+
+static struct regmap_irq_chip bd9571mwv_irq_chip = {
+        .name           = "bd9571mwv",
+        .status_base    = BD9571MWV_INT_INTREQ,
+        .mask_base      = BD9571MWV_INT_INTMASK,
+        .ack_base       = BD9571MWV_INT_INTREQ,
+        .init_ack_masked = true,
+        .num_regs       = 1,
+        .irqs           = bd9571mwv_irqs,
+        .num_irqs       = ARRAY_SIZE(bd9571mwv_irqs),
+};
+
+static int bd9571mwv_identify(struct bd9571mwv *bd)
+{
+        struct device *dev = bd->dev;
+        unsigned int value;
+        int ret;
+
+        ret = regmap_read(bd->regmap, BD9571MWV_VENDOR_CODE, &value);
+        if (ret) {
+                dev_err(dev, "Failed to read vendor code register (ret=%i)\n",
+                        ret);
+                return ret;
+        }
+
+        if (value != BD9571MWV_VENDOR_CODE_VAL) {
+                dev_err(dev, "Invalid vendor code ID %02x (expected %02x)\n",
+                        value, BD9571MWV_VENDOR_CODE_VAL);
+                return -EINVAL;
+        }
+
+        ret = regmap_read(bd->regmap, BD9571MWV_PRODUCT_CODE, &value);
+        if (ret) {
+                dev_err(dev, "Failed to read product code register (ret=%i)\n",
+                        ret);
+                return ret;
+        }
+
+        if (value != BD9571MWV_PRODUCT_CODE_VAL) {
+                dev_err(dev, "Invalid product code ID %02x (expected %02x)\n",
+                        value, BD9571MWV_PRODUCT_CODE_VAL);
+                return -EINVAL;
+        }
+
+        ret = regmap_read(bd->regmap, BD9571MWV_PRODUCT_REVISION, &value);
+        if (ret) {
+                dev_err(dev, "Failed to read revision register (ret=%i)\n",
+                        ret);
+                return ret;
+        }
+
+        dev_info(dev, "Device: BD9571MWV rev. %d\n", value & 0xff);
+
+        return 0;
+}
+
+static int bd9571mwv_probe(struct i2c_client *client,
+                          const struct i2c_device_id *ids)
+{
+        struct bd9571mwv *bd;
+        int ret;
+
+        bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);
+        if (!bd)
+                return -ENOMEM;
+
+        i2c_set_clientdata(client, bd);
+        bd->dev = &client->dev;
+        bd->irq = client->irq;
+
+        bd->regmap = devm_regmap_init_i2c(client, &bd9571mwv_regmap_config);
+        if (IS_ERR(bd->regmap)) {
+                dev_err(bd->dev, "Failed to initialize register map\n");
+                return PTR_ERR(bd->regmap);
+        }
+
+        ret = bd9571mwv_identify(bd);
+        if (ret)
+                return ret;
+
+        ret = regmap_add_irq_chip(bd->regmap, bd->irq, IRQF_ONESHOT, 0,
+                                  &bd9571mwv_irq_chip, &bd->irq_data);
+        if (ret) {
+                dev_err(bd->dev, "Failed to register IRQ chip\n");
+                return ret;
+        }
+
+        ret = mfd_add_devices(bd->dev, PLATFORM_DEVID_AUTO, bd9571mwv_cells,
+                              ARRAY_SIZE(bd9571mwv_cells), NULL, 0,
+                              regmap_irq_get_domain(bd->irq_data));
+        if (ret) {
+                regmap_del_irq_chip(bd->irq, bd->irq_data);
+                return ret;
+        }
+
+        return 0;
+}
+
+static int bd9571mwv_remove(struct i2c_client *client)
+{
+        struct bd9571mwv *bd = i2c_get_clientdata(client);
+
+        regmap_del_irq_chip(bd->irq, bd->irq_data);
+
+        return 0;
+}
+
+static const struct of_device_id bd9571mwv_of_match_table[] = {
+        { .compatible = "rohm,bd9571mwv", },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bd9571mwv_of_match_table);
+
+static const struct i2c_device_id bd9571mwv_id_table[] = {
+        { "bd9571mwv", 0 },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, bd9571mwv_id_table);
+
+static struct i2c_driver bd9571mwv_driver = {
+        .driver         = {
+                .name   = "bd9571mwv",
+                .of_match_table = bd9571mwv_of_match_table,
+        },
+        .probe          = bd9571mwv_probe,
+        .remove         = bd9571mwv_remove,
+        .id_table       = bd9571mwv_id_table,
+};
+module_i2c_driver(bd9571mwv_driver);
+
+MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
+MODULE_DESCRIPTION("BD9571MWV PMIC Driver");
+MODULE_LICENSE("GPL v2");