regulator: max8973: add regulator driver support

The MAXIM MAX8973 high-efficiency, three phase, DC-DC step-down
switching regulator delievers up to 9A of output current. Each
phase operates at a 2MHz fixed frequency with a 120 deg shift
from the adjacent phase, allowing the use of small magnetic
component.

Add regulator driver for this device.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/include/linux/regulator/max8973-regulator.h b/include/linux/regulator/max8973-regulator.h
new file mode 100644
index 000000000000..f8acc052e353
--- /dev/null
+++ b/include/linux/regulator/max8973-regulator.h
@@ -0,0 +1,72 @@
+/*
+ * max8973-regulator.h -- MAXIM 8973 regulator
+ *
+ * Interface for regulator driver for MAXIM 8973 DC-DC step-down
+ * switching regulator.
+ *
+ * Copyright (C) 2012 NVIDIA Corporation
+
+ * Author: Laxman Dewangan <ldewangan@nvidia.com>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ */
+
+#ifndef __LINUX_REGULATOR_MAX8973_H
+#define __LINUX_REGULATOR_MAX8973_H
+
+/*
+ * Control flags for configuration of the device.
+ * Client need to pass this information with ORed
+ */
+#define MAX8973_CONTROL_REMOTE_SENSE_ENABLE                     0x00000001
+#define MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE                0x00000002
+#define MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE              0x00000004
+#define MAX8973_CONTROL_BIAS_ENABLE                             0x00000008
+#define MAX8973_CONTROL_PULL_DOWN_ENABLE                        0x00000010
+#define MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE                  0x00000020
+
+#define MAX8973_CONTROL_CLKADV_TRIP_DISABLED                    0x00000000
+#define MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US                 0x00010000
+#define MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US                0x00020000
+#define MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS        0x00030000
+
+#define MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL                  0x00000000
+#define MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER             0x00100000
+#define MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER              0x00200000
+#define MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER              0x00300000
+
+/*
+ * struct max8973_regulator_platform_data - max8973 regulator platform data.
+ *
+ * @reg_init_data: The regulator init data.
+ * @control_flags: Control flags which are ORed value of above flags to
+ *              configure device.
+ * @enable_ext_control: Enable the voltage enable/disable through external
+ *              control signal from EN input pin. If it is false then
+ *              voltage output will be enabled/disabled through EN bit of
+ *              device register.
+ * @dvs_gpio: GPIO for dvs. It should be -1 if this is tied with fixed logic.
+ * @dvs_def_state: Default state of dvs. 1 if it is high else 0.
+ */
+struct max8973_regulator_platform_data {
+        struct regulator_init_data *reg_init_data;
+        unsigned long control_flags;
+        bool enable_ext_control;
+        int dvs_gpio;
+        unsigned dvs_def_state:1;
+};
+
+#endif /* __LINUX_REGULATOR_MAX8973_H */