mfd: Add TI LMU driver

TI LMU (Lighting Management Unit) driver supports lighting devices below.

  LM3532, LM3631, LM3632, LM3633, LM3695 and LM3697.

LMU devices have common features.
  - I2C interface for accessing device registers
  - Hardware enable pin control
  - Backlight brightness control
  - Notifier for hardware fault monitoring
  - Regulators for LCD display bias

It contains fault monitor, backlight, LED and regulator driver.

LMU fault monitor
-----------------
  LM3633 and LM3697 provide hardware monitoring feature.
  It enables open or short circuit detection.
  After monitoring is done, each device should be re-initialized.
  Notifier is used for this case.
  Separate patch for 'ti-lmu-fault-monitor' will be sent later.

Backlight
---------
  It's handled by TI LMU backlight consolidated driver and
  chip dependent data. Separate patchset will be sent later.

LED indicator
-------------
  LM3633 has 6 indicator LEDs. Programmable dimming pattern is also
  supported. Separate patch for 'leds-lm3633' will be sent later.

Regulator
---------
  LM3631 has 5 regulators for the display bias.
  LM3632 supports 3 regulators. One consolidated driver enables it.
  The lm363x regulator driver is already upstreamed.

Signed-off-by: Milo Kim <milo.kim@ti.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 87 insertions, 0 deletions

diff --git a/include/linux/mfd/ti-lmu.h b/include/linux/mfd/ti-lmu.h
new file mode 100644
index 000000000000..09d5f30384e5
--- /dev/null
+++ b/include/linux/mfd/ti-lmu.h
@@ -0,0 +1,87 @@
+/*
+ * TI LMU (Lighting Management Unit) Devices
+ *
+ * Copyright 2017 Texas Instruments
+ *
+ * Author: Milo Kim <milo.kim@ti.com>
+ *
+ * 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.
+ */
+
+#ifndef __MFD_TI_LMU_H__
+#define __MFD_TI_LMU_H__
+
+#include <linux/gpio.h>
+#include <linux/notifier.h>
+#include <linux/regmap.h>
+
+/* Notifier event */
+#define LMU_EVENT_MONITOR_DONE		0x01
+
+enum ti_lmu_id {
+	LM3532,
+	LM3631,
+	LM3632,
+	LM3633,
+	LM3695,
+	LM3697,
+	LMU_MAX_ID,
+};
+
+enum ti_lmu_max_current {
+	LMU_IMAX_5mA,
+	LMU_IMAX_6mA,
+	LMU_IMAX_7mA = 0x03,
+	LMU_IMAX_8mA,
+	LMU_IMAX_9mA,
+	LMU_IMAX_10mA = 0x07,
+	LMU_IMAX_11mA,
+	LMU_IMAX_12mA,
+	LMU_IMAX_13mA,
+	LMU_IMAX_14mA,
+	LMU_IMAX_15mA = 0x0D,
+	LMU_IMAX_16mA,
+	LMU_IMAX_17mA,
+	LMU_IMAX_18mA,
+	LMU_IMAX_19mA,
+	LMU_IMAX_20mA = 0x13,
+	LMU_IMAX_21mA,
+	LMU_IMAX_22mA,
+	LMU_IMAX_23mA = 0x17,
+	LMU_IMAX_24mA,
+	LMU_IMAX_25mA,
+	LMU_IMAX_26mA,
+	LMU_IMAX_27mA = 0x1C,
+	LMU_IMAX_28mA,
+	LMU_IMAX_29mA,
+	LMU_IMAX_30mA,
+};
+
+enum lm363x_regulator_id {
+	LM3631_BOOST,		/* Boost output */
+	LM3631_LDO_CONT,	/* Display panel controller */
+	LM3631_LDO_OREF,	/* Gamma reference */
+	LM3631_LDO_POS,		/* Positive display bias output */
+	LM3631_LDO_NEG,		/* Negative display bias output */
+	LM3632_BOOST,		/* Boost output */
+	LM3632_LDO_POS,		/* Positive display bias output */
+	LM3632_LDO_NEG,		/* Negative display bias output */
+};
+
+/**
+ * struct ti_lmu
+ *
+ * @dev:	Parent device pointer
+ * @regmap:	Used for i2c communcation on accessing registers
+ * @en_gpio:	GPIO for HWEN pin [Optional]
+ * @notifier:	Notifier for reporting hwmon event
+ */
+struct ti_lmu {
+	struct device *dev;
+	struct regmap *regmap;
+	int en_gpio;
+	struct blocking_notifier_head notifier;
+};
+#endif