mfd: Add STw481x driver

This adds a driver for the STw481x PMICs found in the Nomadik
family of platforms. This one uses pure device tree probing.
Print some of the OTP registers on boot and register a regulator
MFD child.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/include/linux/mfd/stw481x.h b/include/linux/mfd/stw481x.h
new file mode 100644
index 000000000000..eda121556e5d
--- /dev/null
+++ b/include/linux/mfd/stw481x.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2011 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+#ifndef MFD_STW481X_H
+#define MFD_STW481X_H
+
+#include <linux/i2c.h>
+#include <linux/regulator/machine.h>
+#include <linux/regmap.h>
+#include <linux/bitops.h>
+
+/* These registers are accessed from more than one driver */
+#define STW_CONF1                       0x11U
+#define STW_CONF1_PDN_VMMC              0x01U
+#define STW_CONF1_VMMC_MASK             0x0eU
+#define STW_CONF1_VMMC_1_8V             0x02U
+#define STW_CONF1_VMMC_2_85V            0x04U
+#define STW_CONF1_VMMC_3V               0x06U
+#define STW_CONF1_VMMC_1_85V            0x08U
+#define STW_CONF1_VMMC_2_6V             0x0aU
+#define STW_CONF1_VMMC_2_7V             0x0cU
+#define STW_CONF1_VMMC_3_3V             0x0eU
+#define STW_CONF1_MMC_LS_STATUS         0x10U
+#define STW_PCTL_REG_LO                 0x1eU
+#define STW_PCTL_REG_HI                 0x1fU
+#define STW_CONF1_V_MONITORING          0x20U
+#define STW_CONF1_IT_WARN               0x40U
+#define STW_CONF1_PDN_VAUX              0x80U
+#define STW_CONF2                       0x20U
+#define STW_CONF2_MASK_TWARN            0x01U
+#define STW_CONF2_VMMC_EXT              0x02U
+#define STW_CONF2_MASK_IT_WAKE_UP       0x04U
+#define STW_CONF2_GPO1                  0x08U
+#define STW_CONF2_GPO2                  0x10U
+#define STW_VCORE_SLEEP                 0x21U
+
+/**
+ * struct stw481x - state holder for the Stw481x drivers
+ * @mutex: mutex to serialize I2C accesses
+ * @i2c_client: corresponding I2C client
+ * @regulator: regulator device for regulator children
+ * @map: regmap handle to access device registers
+ */
+struct stw481x {
+        struct mutex            lock;
+        struct i2c_client       *client;
+        struct regulator_dev    *vmmc_regulator;
+        struct regmap           *map;
+};
+
+#endif