i2c: Add TPS6586X driver

This power management chip supports battery charging and a large number
of power supplies. This initial driver only provides the ability to adjust
the two synchronous buck converters SM0 and SM1 in a stepwise manner.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/include/tps6586x.h b/include/tps6586x.h
new file mode 100644
index 0000000000..ab880823a3
--- /dev/null
+++ b/include/tps6586x.h
@@ -0,0 +1,68 @@
+/*
+ *  (C) Copyright 2010,2011
+ *  NVIDIA Corporation <www.nvidia.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __H_
+#define _TPS6586X_H_
+
+enum {
+	/* SM0-2 PWM/PFM Mode Selection */
+	TPS6586X_PWM_SM0	= 1 << 0,
+	TPS6586X_PWM_SM1	= 1 << 1,
+	TPS6586X_PWM_SM2	= 1 << 2,
+};
+
+/**
+ * Enable PWM mode for selected SM0-2
+ *
+ * @param mask	Mask of synchronous converter to enable (TPS6586X_PWM_...)
+ * @return 0 if ok, -1 on error
+ */
+int tps6586x_set_pwm_mode(int mask);
+
+/**
+ * Adjust SM0 and SM1 voltages to the given targets in incremental steps.
+ *
+ * @param sm0_target	Target voltage for SM0 in 25mW units, 0=725mV, 31=1.5V
+ * @param sm1_target	Target voltage for SM1 in 25mW units, 0=725mV, 31=1.5V
+ * @param step		Amount to change voltage in each step, in 25mW units
+ * @param rate		Slew ratein mV/us: 0=instantly, 1=0.11, 2=0.22,
+ *			3=0.44, 4=0.88, 5=1.76, 6=3.52, 7=7.04
+ * @param min_sm0_over_sm1	Minimum amount by which sm0 must exceed sm1.
+ *			If this condition is not met, no adjustment will be
+ *			done and an error will be reported. Use -1 to skip
+ *			this check.
+ * @return 0 if ok, -1 on error
+ */
+int tps6586x_adjust_sm0_sm1(int sm0_target, int sm1_target, int step, int rate,
+			    int min_sm0_over_sm1);
+
+/**
+ * Set up the TPS6586X I2C bus number. This will be used for all operations
+ * on the device. This function must be called before using other functions.
+ *
+ * @param bus	I2C bus number containing the TPS6586X chip
+ * @return 0 (always succeeds)
+ */
+int tps6586x_init(int bus);
+
+#endif	/* _TPS6586X_H_ */