regulator: Fairchild fan53555 support

This driver supports Fairchild FAN53555 Digitally Programmable
TinyBuck Regulator. The FAN53555 is a step-down switching voltage
regulator that delivers a digitally programmable output from an
input voltage supply of 2.5V to 5.5V. The output voltage is
programmed through an I2C interface.

Signed-off-by: Yunfan Zhang <yfzhang@marvell.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/include/linux/regulator/fan53555.h b/include/linux/regulator/fan53555.h
new file mode 100644
index 000000000000..5c45c85d52ca
--- /dev/null
+++ b/include/linux/regulator/fan53555.h
@@ -0,0 +1,60 @@
+/*
+ * fan53555.h - Fairchild Regulator FAN53555 Driver
+ *
+ * Copyright (C) 2012 Marvell Technology Ltd.
+ * Yunfan Zhang <yfzhang@marvell.com>
+ *
+ * This package 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.
+ *
+ */
+
+#ifndef __FAN53555_H__
+
+/* VSEL ID */
+enum {
+        FAN53555_VSEL_ID_0 = 0,
+        FAN53555_VSEL_ID_1,
+};
+
+/* Transition slew rate limiting from a low to high voltage.
+ * -----------------------
+ *   Bin |Slew Rate(mV/uS)
+ * ------|----------------
+ *   000 |    64.00
+ * ------|----------------
+ *   001 |    32.00
+ * ------|----------------
+ *   010 |    16.00
+ * ------|----------------
+ *   011 |     8.00
+ * ------|----------------
+ *   100 |     4.00
+ * ------|----------------
+ *   101 |     2.00
+ * ------|----------------
+ *   110 |     1.00
+ * ------|----------------
+ *   111 |     0.50
+ * -----------------------
+ */
+enum {
+        FAN53555_SLEW_RATE_64MV = 0,
+        FAN53555_SLEW_RATE_32MV,
+        FAN53555_SLEW_RATE_16MV,
+        FAN53555_SLEW_RATE_8MV,
+        FAN53555_SLEW_RATE_4MV,
+        FAN53555_SLEW_RATE_2MV,
+        FAN53555_SLEW_RATE_1MV,
+        FAN53555_SLEW_RATE_0_5MV,
+};
+
+struct fan53555_platform_data {
+        struct regulator_init_data *regulator;
+        unsigned int slew_rate;
+        /* Sleep VSEL ID */
+        unsigned int sleep_vsel_id;
+};
+
+#endif /* __FAN53555_H__ */