mfd: axp20x: Add support for RSB based AXP223 PMIC

The AXP223 is a new PMIC commonly paired with Allwinner A23/A33 SoCs.
It is functionally identical to AXP221; only the regulator default
voltage/status and the external host interface are different.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

5 files changed, 95 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 0037b9c933d9..ae3990b5a2bf 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -107,6 +107,17 @@ config MFD_AXP20X_I2C
           components like regulators or the PEK (Power Enable Key) under the
           corresponding menus.
 
+config MFD_AXP20X_RSB
+        tristate "X-Powers AXP series PMICs with RSB"
+        select MFD_AXP20X
+        depends on SUNXI_RSB
+        help
+          If you say Y here you get support for the X-Powers AXP series power
+          management ICs (PMICs) controlled with RSB.
+          This driver include only the core APIs. You have to select individual
+          components like regulators or the PEK (Power Enable Key) under the
+          corresponding menus.
+
 config MFD_CROS_EC
         tristate "ChromeOS Embedded Controller"
         select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index dba4f99d9044..c69ea744fd1a 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -112,6 +112,7 @@ obj-$(CONFIG_MFD_DA9052_SPI)	+= da9052-spi.o
 obj-$(CONFIG_MFD_DA9052_I2C)    += da9052-i2c.o
 obj-$(CONFIG_MFD_AXP20X)        += axp20x.o
 obj-$(CONFIG_MFD_AXP20X_I2C)    += axp20x-i2c.o
+obj-$(CONFIG_MFD_AXP20X_RSB)    += axp20x-rsb.o
 
 obj-$(CONFIG_MFD_LP3943)        += lp3943.o
 obj-$(CONFIG_MFD_LP8788)        += lp8788.o lp8788-irq.o
diff --git a/drivers/mfd/axp20x-rsb.c b/drivers/mfd/axp20x-rsb.c
new file mode 100644
index 000000000000..28c20247c112
--- /dev/null
+++ b/drivers/mfd/axp20x-rsb.c
@@ -0,0 +1,80 @@
+/*
+ * RSB driver for the X-Powers' Power Management ICs
+ *
+ * AXP20x typically comprises an adaptive USB-Compatible PWM charger, BUCK DC-DC
+ * converters, LDOs, multiple 12-bit ADCs of voltage, current and temperature
+ * as well as configurable GPIOs.
+ *
+ * This driver supports the RSB variants.
+ *
+ * Copyright (C) 2015 Chen-Yu Tsai
+ *
+ * Author: Chen-Yu Tsai <wens@csie.org>
+ *
+ * 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.
+ */
+
+#include <linux/acpi.h>
+#include <linux/err.h>
+#include <linux/mfd/axp20x.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/sunxi-rsb.h>
+
+static int axp20x_rsb_probe(struct sunxi_rsb_device *rdev)
+{
+        struct axp20x_dev *axp20x;
+        int ret;
+
+        axp20x = devm_kzalloc(&rdev->dev, sizeof(*axp20x), GFP_KERNEL);
+        if (!axp20x)
+                return -ENOMEM;
+
+        axp20x->dev = &rdev->dev;
+        axp20x->irq = rdev->irq;
+        dev_set_drvdata(&rdev->dev, axp20x);
+
+        ret = axp20x_match_device(axp20x);
+        if (ret)
+                return ret;
+
+        axp20x->regmap = devm_regmap_init_sunxi_rsb(rdev, axp20x->regmap_cfg);
+        if (IS_ERR(axp20x->regmap)) {
+                ret = PTR_ERR(axp20x->regmap);
+                dev_err(&rdev->dev, "regmap init failed: %d\n", ret);
+                return ret;
+        }
+
+        return axp20x_device_probe(axp20x);
+}
+
+static int axp20x_rsb_remove(struct sunxi_rsb_device *rdev)
+{
+        struct axp20x_dev *axp20x = sunxi_rsb_device_get_drvdata(rdev);
+
+        return axp20x_device_remove(axp20x);
+}
+
+static const struct of_device_id axp20x_rsb_of_match[] = {
+        { .compatible = "x-powers,axp223", .data = (void *)AXP223_ID },
+        { },
+};
+MODULE_DEVICE_TABLE(of, axp20x_rsb_of_match);
+
+static struct sunxi_rsb_driver axp20x_rsb_driver = {
+        .driver = {
+                .name   = "axp20x-rsb",
+                .of_match_table = of_match_ptr(axp20x_rsb_of_match),
+        },
+        .probe  = axp20x_rsb_probe,
+        .remove = axp20x_rsb_remove,
+};
+module_sunxi_rsb_driver(axp20x_rsb_driver);
+
+MODULE_DESCRIPTION("PMIC MFD sunXi RSB driver for AXP20X");
+MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/mfd/axp20x.c b/drivers/mfd/axp20x.c
index 3054ea4b95e8..a57d6e940610 100644
--- a/drivers/mfd/axp20x.c
+++ b/drivers/mfd/axp20x.c
@@ -35,6 +35,7 @@ static const char * const axp20x_model_names[] = {
         "AXP202",
         "AXP209",
         "AXP221",
+        "AXP223",
         "AXP288",
 };
 
@@ -618,6 +619,7 @@ int axp20x_match_device(struct axp20x_dev *axp20x)
                 axp20x->regmap_irq_chip = &axp20x_regmap_irq_chip;
                 break;
         case AXP221_ID:
+        case AXP223_ID:
                 axp20x->nr_cells = ARRAY_SIZE(axp22x_cells);
                 axp20x->cells = axp22x_cells;
                 axp20x->regmap_cfg = &axp22x_regmap_config;
diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h
index 00697c6ad8b0..d82e7d51372b 100644
--- a/include/linux/mfd/axp20x.h
+++ b/include/linux/mfd/axp20x.h
@@ -18,6 +18,7 @@ enum {
         AXP202_ID,
         AXP209_ID,
         AXP221_ID,
+        AXP223_ID,
         AXP288_ID,
         NR_AXP20X_VARIANTS,
 };