power: Add support for TPS65090 PMU chip.

This adds driver support for the TPS65090 PMU. Support includes
hooking into the pmic infrastructure  so that the pmic commands
can be used on the console. The TPS65090 supports the following
functionality:

- fet enable/disable/querying
- getting and setting of charge state

Even though it is connected to the pmic infrastructure it does
not hook into the pmic charging charging infrastructure.

The device tree binding is from Linux, but only a small subset of
functionality is supported.

Signed-off-by: Tom Wai-Hong Tam <waihong@chromium.org>
Signed-off-by: Hatim Ali <hatim.rv@samsung.com>
Signed-off-by: Katie Roberts-Hoffman <katierh@chromium.org>
Signed-off-by: Rong Chang <rongchang@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

doc/device-tree-bindings/power/tps65090.txt

@@ -0,0 +1,17 @@
+TPS65090 Frontend PMU with Switchmode Charger
+
+Required Properties:
+-compatible: "ti,tps65090-charger"
+
+Optional Properties:
+-ti,enable-low-current-chrg: Enables charging when a low current is detected
+ while the default logic is to stop charging.
+
+This node is a subnode of the tps65090 PMIC.
+
+Example:
+
+	tps65090-charger {
+		compatible = "ti,tps65090-charger";
+		ti,enable-low-current-chrg;
+	};

doc/device-tree-bindings/regulator/tps65090.txt

@@ -0,0 +1,122 @@
+TPS65090 regulators
+
+Required properties:
+- compatible: "ti,tps65090"
+- reg: I2C slave address
+- interrupts: the interrupt outputs of the controller
+- regulators: A node that houses a sub-node for each regulator within the
+  device. Each sub-node is identified using the node's name, with valid
+  values listed below. The content of each sub-node is defined by the
+  standard binding for regulators; see regulator.txt.
+  dcdc[1-3], fet[1-7] and ldo[1-2] respectively.
+- vsys[1-3]-supply: The input supply for DCDC[1-3] respectively.
+- infet[1-7]-supply: The input supply for FET[1-7] respectively.
+- vsys-l[1-2]-supply: The input supply for LDO[1-2] respectively.
+
+Optional properties:
+- ti,enable-ext-control: This is applicable for DCDC1, DCDC2 and DCDC3.
+  If DCDCs are externally controlled then this property should be there.
+- "dcdc-ext-control-gpios: This is applicable for DCDC1, DCDC2 and DCDC3.
+  If DCDCs are externally controlled and if it is from GPIO then GPIO
+  number should be provided. If it is externally controlled and no GPIO
+  entry then driver will just configure this rails as external control
+  and will not provide any enable/disable APIs.
+
+Each regulator is defined using the standard binding for regulators.
+
+Example:
+
+	tps65090@48 {
+		compatible = "ti,tps65090";
+		reg = <0x48>;
+		interrupts = <0 88 0x4>;
+
+		vsys1-supply = <&some_reg>;
+		vsys2-supply = <&some_reg>;
+		vsys3-supply = <&some_reg>;
+		infet1-supply = <&some_reg>;
+		infet2-supply = <&some_reg>;
+		infet3-supply = <&some_reg>;
+		infet4-supply = <&some_reg>;
+		infet5-supply = <&some_reg>;
+		infet6-supply = <&some_reg>;
+		infet7-supply = <&some_reg>;
+		vsys_l1-supply = <&some_reg>;
+		vsys_l2-supply = <&some_reg>;
+
+		regulators {
+			dcdc1 {
+				regulator-name = "dcdc1";
+				regulator-boot-on;
+				regulator-always-on;
+				ti,enable-ext-control;
+				dcdc-ext-control-gpios = <&gpio 10 0>;
+			};
+
+			dcdc2 {
+				regulator-name = "dcdc2";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			dcdc3 {
+				regulator-name = "dcdc3";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			fet1 {
+				regulator-name = "fet1";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			fet2 {
+				regulator-name = "fet2";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			fet3 {
+				regulator-name = "fet3";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			fet4 {
+				regulator-name = "fet4";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			fet5 {
+				regulator-name = "fet5";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			fet6 {
+				regulator-name = "fet6";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			fet7 {
+				regulator-name = "fet7";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			ldo1 {
+				regulator-name = "ldo1";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			ldo2 {
+				regulator-name = "ldo2";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+		};
+	};

drivers/power/pmic/Makefile

@@ -10,5 +10,6 @@ obj-$(CONFIG_POWER_MAX8997) += pmic_max8997.o
 obj-$(CONFIG_POWER_MUIC_MAX8997) += muic_max8997.o
 obj-$(CONFIG_POWER_MAX77686) += pmic_max77686.o
 obj-$(CONFIG_POWER_PFUZE100) += pmic_pfuze100.o
+obj-$(CONFIG_POWER_TPS65090) += pmic_tps65090.o
 obj-$(CONFIG_POWER_TPS65217) += pmic_tps65217.o
 obj-$(CONFIG_POWER_TPS65910) += pmic_tps65910.o

drivers/power/pmic/pmic_tps65090.c

@@ -0,0 +1,310 @@
+/*
+ * Copyright (c) 2012 The Chromium OS Authors.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/tps65090_pmic.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define TPS65090_NAME "TPS65090_PMIC"
+
+/* TPS65090 register addresses */
+enum {
+	REG_IRQ1 = 0,
+	REG_CG_CTRL0 = 4,
+	REG_CG_STATUS1 = 0xa,
+	REG_FET1_CTRL = 0x0f,
+	REG_FET2_CTRL,
+	REG_FET3_CTRL,
+	REG_FET4_CTRL,
+	REG_FET5_CTRL,
+	REG_FET6_CTRL,
+	REG_FET7_CTRL,
+	TPS65090_NUM_REGS,
+};
+
+enum {
+	IRQ1_VBATG = 1 << 3,
+	CG_CTRL0_ENC_MASK	= 0x01,
+
+	MAX_FET_NUM	= 7,
+	MAX_CTRL_READ_TRIES = 5,
+
+	/* TPS65090 FET_CTRL register values */
+	FET_CTRL_TOFET		= 1 << 7,  /* Timeout, startup, overload */
+	FET_CTRL_PGFET		= 1 << 4,  /* Power good for FET status */
+	FET_CTRL_WAIT		= 3 << 2,  /* Overcurrent timeout max */
+	FET_CTRL_ADENFET	= 1 << 1,  /* Enable output auto discharge */
+	FET_CTRL_ENFET		= 1 << 0,  /* Enable FET */
+};
+
+/**
+ * Checks for a valid FET number
+ *
+ * @param fet_id	FET number to check
+ * @return 0 if ok, -EINVAL if FET value is out of range
+ */
+static int tps65090_check_fet(unsigned int fet_id)
+{
+	if (fet_id == 0 || fet_id > MAX_FET_NUM) {
+		debug("parameter fet_id is out of range, %u not in 1 ~ %u\n",
+		      fet_id, MAX_FET_NUM);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/**
+ * Set the power state for a FET
+ *
+ * @param pmic		pmic structure for the tps65090
+ * @param fet_id	Fet number to set (1..MAX_FET_NUM)
+ * @param set		1 to power on FET, 0 to power off
+ * @return -EIO if we got a comms error, -EAGAIN if the FET failed to
+ * change state. If all is ok, returns 0.
+ */
+static int tps65090_fet_set(struct pmic *pmic, int fet_id, bool set)
+{
+	int retry;
+	u32 reg, value;
+
+	value = FET_CTRL_ADENFET | FET_CTRL_WAIT;
+	if (set)
+		value |= FET_CTRL_ENFET;
+
+	if (pmic_reg_write(pmic, REG_FET1_CTRL + fet_id - 1, value))
+		return -EIO;
+
+	/* Try reading until we get a result */
+	for (retry = 0; retry < MAX_CTRL_READ_TRIES; retry++) {
+		if (pmic_reg_read(pmic, REG_FET1_CTRL + fet_id - 1, &reg))
+			return -EIO;
+
+		/* Check that the fet went into the expected state */
+		if (!!(reg & FET_CTRL_PGFET) == set)
+			return 0;
+
+		/* If we got a timeout, there is no point in waiting longer */
+		if (reg & FET_CTRL_TOFET)
+			break;
+
+		mdelay(1);
+	}
+
+	debug("FET %d: Power good should have set to %d but reg=%#02x\n",
+	      fet_id, set, reg);
+	return -EAGAIN;
+}
+
+int tps65090_fet_enable(unsigned int fet_id)
+{
+	struct pmic *pmic;
+	ulong start;
+	int loops;
+	int ret;
+
+	ret = tps65090_check_fet(fet_id);
+	if (ret)
+		return ret;
+
+	pmic = pmic_get(TPS65090_NAME);
+	if (!pmic)
+		return -EACCES;
+
+	start = get_timer(0);
+	for (loops = 0;; loops++) {
+		ret = tps65090_fet_set(pmic, fet_id, true);
+		if (!ret)
+			break;
+
+		if (get_timer(start) > 100)
+			break;
+
+		/* Turn it off and try again until we time out */
+		tps65090_fet_set(pmic, fet_id, false);
+	}
+
+	if (ret)
+		debug("%s: FET%d failed to power on: time=%lums, loops=%d\n",
+		      __func__, fet_id, get_timer(start), loops);
+	else if (loops)
+		debug("%s: FET%d powered on after %lums, loops=%d\n",
+		      __func__, fet_id, get_timer(start), loops);
+
+	/*
+	 * Unfortunately, there are some conditions where the power
+	 * good bit will be 0, but the fet still comes up. One such
+	 * case occurs with the lcd backlight. We'll just return 0 here
+	 * and assume that the fet will eventually come up.
+	 */
+	if (ret == -EAGAIN)
+		ret = 0;
+
+	return ret;
+}
+
+int tps65090_fet_disable(unsigned int fet_id)
+{
+	struct pmic *pmic;
+	int ret;
+
+	ret = tps65090_check_fet(fet_id);
+	if (ret)
+		return ret;
+
+	pmic = pmic_get(TPS65090_NAME);
+	if (!pmic)
+		return -EACCES;
+	ret = tps65090_fet_set(pmic, fet_id, false);
+
+	return ret;
+}
+
+int tps65090_fet_is_enabled(unsigned int fet_id)
+{
+	struct pmic *pmic;
+	u32 reg;
+	int ret;
+
+	ret = tps65090_check_fet(fet_id);
+	if (ret)
+		return ret;
+
+	pmic = pmic_get(TPS65090_NAME);
+	if (!pmic)
+		return -ENODEV;
+	ret = pmic_reg_read(pmic, REG_FET1_CTRL + fet_id - 1, &reg);
+	if (ret) {
+		debug("fail to read FET%u_CTRL register over I2C", fet_id);
+		return -EIO;
+	}
+
+	return reg & FET_CTRL_ENFET;
+}
+
+int tps65090_get_charging(void)
+{
+	struct pmic *pmic;
+	u32 val;
+	int ret;
+
+	pmic = pmic_get(TPS65090_NAME);
+	if (!pmic)
+		return -EACCES;
+
+	ret = pmic_reg_read(pmic, REG_CG_CTRL0, &val);
+	if (ret)
+		return ret;
+
+	return !!(val & CG_CTRL0_ENC_MASK);
+}
+
+static int tps65090_charger_state(struct pmic *pmic, int state,
+				  int current)
+{
+	u32 val;
+	int ret;
+
+	ret = pmic_reg_read(pmic, REG_CG_CTRL0, &val);
+	if (!ret) {
+		if (state == PMIC_CHARGER_ENABLE)
+			val |= CG_CTRL0_ENC_MASK;
+		else
+			val &= ~CG_CTRL0_ENC_MASK;
+		ret = pmic_reg_write(pmic, REG_CG_CTRL0, val);
+	}
+	if (ret) {
+		debug("%s: Failed to read/write register\n", __func__);
+		return ret;
+	}
+
+	return 0;
+}
+
+int tps65090_get_status(void)
+{
+	struct pmic *pmic;
+	u32 val;
+	int ret;
+
+	pmic = pmic_get(TPS65090_NAME);
+	if (!pmic)
+		return -EACCES;
+
+	ret = pmic_reg_read(pmic, REG_CG_STATUS1, &val);
+	if (ret)
+		return ret;
+
+	return val;
+}
+
+static int tps65090_charger_bat_present(struct pmic *pmic)
+{
+	u32 val;
+	int ret;
+
+	ret = pmic_reg_read(pmic, REG_IRQ1, &val);
+	if (ret)
+		return ret;
+
+	return !!(val & IRQ1_VBATG);
+}
+
+static struct power_chrg power_chrg_pmic_ops = {
+	.chrg_bat_present = tps65090_charger_bat_present,
+	.chrg_state = tps65090_charger_state,
+};
+
+int tps65090_init(void)
+{
+	struct pmic *p;
+	int bus;
+	int addr;
+	const void *blob = gd->fdt_blob;
+	int node, parent;
+
+	node = fdtdec_next_compatible(blob, 0, COMPAT_TI_TPS65090);
+	if (node < 0) {
+		debug("PMIC: No node for PMIC Chip in device tree\n");
+		debug("node = %d\n", node);
+		return -ENODEV;
+	}
+
+	parent = fdt_parent_offset(blob, node);
+	if (parent < 0) {
+		debug("%s: Cannot find node parent\n", __func__);
+		return -EINVAL;
+	}
+
+	bus = i2c_get_bus_num_fdt(parent);
+	if (p->bus < 0) {
+		debug("%s: Cannot find I2C bus\n", __func__);
+		return -ENOENT;
+	}
+	addr = fdtdec_get_int(blob, node, "reg", TPS65090_I2C_ADDR);
+	p = pmic_alloc();
+	if (!p) {
+		printf("%s: POWER allocation error!\n", __func__);
+		return -ENOMEM;
+	}
+
+	p->name = TPS65090_NAME;
+	p->bus = bus;
+	p->interface = PMIC_I2C;
+	p->number_of_regs = TPS65090_NUM_REGS;
+	p->hw.i2c.addr = addr;
+	p->hw.i2c.tx_num = 1;
+	p->chrg = &power_chrg_pmic_ops;
+
+	puts("TPS65090 PMIC init\n");
+
+	return 0;
+}

include/fdtdec.h

@@ -92,6 +92,7 @@ enum fdt_compat_id {
 	COMPAT_SAMSUNG_EXYNOS5_I2C,	/* Exynos5 High Speed I2C Controller */
 	COMPAT_SANDBOX_HOST_EMULATION,	/* Sandbox emulation of a function */
 	COMPAT_SANDBOX_LCD_SDL,		/* Sandbox LCD emulation with SDL */
+	COMPAT_TI_TPS65090,		/* Texas Instrument TPS65090 */
 
 	COMPAT_COUNT,
 };

include/power/tps65090_pmic.h

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2012 The Chromium OS Authors.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __TPS65090_PMIC_H_
+#define __TPS65090_PMIC_H_
+
+/* I2C device address for TPS65090 PMU */
+#define TPS65090_I2C_ADDR	0x48
+
+enum {
+	/* Status register fields */
+	TPS65090_ST1_OTC	= 1 << 0,
+	TPS65090_ST1_OCC	= 1 << 1,
+	TPS65090_ST1_STATE_SHIFT = 4,
+	TPS65090_ST1_STATE_MASK	= 0xf << TPS65090_ST1_STATE_SHIFT,
+};
+
+/**
+ * Enable FET
+ *
+ * @param	fet_id	FET ID, value between 1 and 7
+ * @return	0 on success, non-0 on failure
+ */
+int tps65090_fet_enable(unsigned int fet_id);
+
+/**
+ * Disable FET
+ *
+ * @param	fet_id	FET ID, value between 1 and 7
+ * @return	0 on success, non-0 on failure
+ */
+int tps65090_fet_disable(unsigned int fet_id);
+
+/**
+ * Is FET enabled?
+ *
+ * @param	fet_id	FET ID, value between 1 and 7
+ * @return	1 enabled, 0 disabled, negative value on failure
+ */
+int tps65090_fet_is_enabled(unsigned int fet_id);
+
+/**
+ * Enable / disable the battery charger
+ *
+ * @param enable	0 to disable charging, non-zero to enable
+ */
+int tps65090_set_charge_enable(int enable);
+
+/**
+ * Check whether we have enabled battery charging
+ *
+ * @return 1 if enabled, 0 if disabled
+ */
+int tps65090_get_charging(void);
+
+/**
+ * Return the value of the status register
+ *
+ * @return status register value, or -1 on error
+ */
+int tps65090_get_status(void);
+
+/**
+ * Initialize the TPS65090 PMU.
+ *
+ * @return	0 on success, non-0 on failure
+ */
+int tps65090_init(void);
+
+#endif /* __TPS65090_PMIC_H_ */

lib/fdtdec.c

@@ -66,6 +66,7 @@ static const char * const compat_names[COMPAT_COUNT] = {
 	COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"),
 	COMPAT(SANDBOX_HOST_EMULATION, "sandbox,host-emulation"),
 	COMPAT(SANDBOX_LCD_SDL, "sandbox,lcd-sdl"),
+	COMPAT(TI_TPS65090, "ti,tps65090"),
 };
 
 const char *fdtdec_get_compatible(enum fdt_compat_id id)