1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (C) 2014-2015 Samsung Electronics
4 * Przemyslaw Marczak <p.marczak@samsung.com>
6 * Copyright (C) 2011-2012 Samsung Electronics
7 * Lukasz Majewski <l.majewski@samsung.com>
10 #ifndef __CORE_PMIC_H_
11 #define __CORE_PMIC_H_
13 #include <dm/ofnode.h>
15 #include <linux/list.h>
16 #include <power/power_chrg.h>
18 enum { PMIC_I2C, PMIC_SPI, PMIC_NONE};
20 /* TODO: Change to !CONFIG_IS_ENABLED(DM_PMIC) when SPL_DM_PMIC exists */
21 #if CONFIG_IS_ENABLED(POWER_LEGACY)
22 enum { I2C_PMIC, I2C_NUM, };
23 enum { PMIC_READ, PMIC_WRITE, };
24 enum { PMIC_SENSOR_BYTE_ORDER_LITTLE, PMIC_SENSOR_BYTE_ORDER_BIG, };
43 u32 (*prepare_tx)(u32 reg, u32 *val, u32 write);
48 int (*fg_battery_check) (struct pmic *p, struct pmic *bat);
49 int (*fg_battery_update) (struct pmic *p, struct pmic *bat);
53 int (*chrg_type) (struct pmic *p);
54 int (*chrg_bat_present) (struct pmic *p);
55 int (*chrg_state) (struct pmic *p, int state, int current);
58 struct power_battery {
60 int (*battery_init) (struct pmic *bat, struct pmic *p1,
61 struct pmic *p2, struct pmic *p3);
62 int (*battery_charge) (struct pmic *bat);
63 /* Keep info about power devices involved with battery operation */
64 struct pmic *chrg, *fg, *muic;
70 unsigned char interface;
71 unsigned char sensor_byte_order;
72 unsigned int number_of_regs;
78 void (*low_power_mode) (void);
79 struct power_battery *pbat;
80 struct power_chrg *chrg;
84 struct list_head list;
86 #endif /* CONFIG_IS_ENABLED(POWER_LEGACY) */
88 /* TODO: Change to CONFIG_IS_ENABLED(DM_PMIC) when SPL_DM_PMIC exists */
91 * U-Boot PMIC Framework
92 * =====================
94 * UCLASS_PMIC - This is designed to provide an I/O interface for PMIC devices.
96 * For the multi-function PMIC devices, this can be used as parent I/O device
97 * for each IC's interface. Then, each child uses its parent for read/write.
99 * The driver model tree could look like this:
102 * |_ BUS 0 device (e.g. I2C0) - UCLASS_I2C/SPI/...
103 * | |_ PMIC device (READ/WRITE ops) - UCLASS_PMIC
104 * | |_ REGULATOR device (ldo/buck/... ops) - UCLASS_REGULATOR
105 * | |_ CHARGER device (charger ops) - UCLASS_CHARGER (in the future)
106 * | |_ MUIC device (microUSB connector ops) - UCLASS_MUIC (in the future)
109 * |_ BUS 1 device (e.g. I2C1) - UCLASS_I2C/SPI/...
110 * |_ PMIC device (READ/WRITE ops) - UCLASS_PMIC
111 * |_ RTC device (rtc ops) - UCLASS_RTC (in the future)
113 * We can find two PMIC cases in boards design:
114 * - single I/O interface
115 * - multiple I/O interfaces
116 * We bind a single PMIC device for each interface, to provide an I/O for
117 * its child devices. And each child usually implements a different function,
118 * controlled by the same interface.
120 * The binding should be done automatically. If device tree nodes/subnodes are
121 * proper defined, then:
123 * |_ the ROOT driver will bind the device for I2C/SPI node:
124 * |_ the I2C/SPI driver should bind a device for pmic node:
125 * |_ the PMIC driver should bind devices for its childs:
126 * |_ regulator (child)
130 * The same for other device nodes, for multi-interface PMIC.
133 * Each PMIC interface driver should use a different compatible string.
135 * If a PMIC child device driver needs access the PMIC-specific registers,
136 * it need know only the register address and the access can be done through
137 * the parent pmic driver. Like in the example:
140 * |_ dev: bus I2C0 - UCLASS_I2C
141 * | |_ dev: my_pmic (read/write) (is parent) - UCLASS_PMIC
142 * | |_ dev: my_regulator (set value/etc..) (is child) - UCLASS_REGULATOR
144 * To ensure such device relationship, the pmic device driver should also bind
145 * all its child devices, like in the example below. It can be done by calling
146 * the 'pmic_bind_children()' - please refer to the function description, which
147 * can be found in this header file. This function, should be called inside the
148 * driver's bind() method.
150 * For the example driver, please refer the MAX77686 driver:
151 * - 'drivers/power/pmic/max77686.c'
155 * struct dm_pmic_ops - PMIC device I/O interface
157 * Should be implemented by UCLASS_PMIC device drivers. The standard
158 * device operations provides the I/O interface for it's childs.
160 * @reg_count: device's register count
161 * @read: read 'len' bytes at "reg" and store it into the 'buffer'
162 * @write: write 'len' bytes from the 'buffer' to the register at 'reg' address
165 int (*reg_count)(struct udevice *dev);
166 int (*read)(struct udevice *dev, uint reg, uint8_t *buffer, int len);
167 int (*write)(struct udevice *dev, uint reg, const uint8_t *buffer,
172 * enum pmic_op_type - used for various pmic devices operation calls,
173 * for reduce a number of lines with the same code for read/write or get/set.
175 * @PMIC_OP_GET - get operation
176 * @PMIC_OP_SET - set operation
184 * struct pmic_child_info - basic device's child info for bind child nodes with
185 * the driver by the node name prefix and driver name. This is a helper struct
186 * for function: pmic_bind_children().
188 * @prefix - child node name prefix (or its name if is unique or single)
189 * @driver - driver name for the sub-node with prefix
191 struct pmic_child_info {
196 /* drivers/power/pmic-uclass.c */
199 * pmic_bind_children() - bind drivers for given parent pmic, using child info
200 * found in 'child_info' array.
202 * @pmic - pmic device - the parent of found child's
203 * @child_info - N-childs info array
204 * Return: a positive number of childs, or 0 if no child found (error)
206 * Note: For N-childs the child_info array should have N+1 entries and the last
207 * entry prefix should be NULL - the same as for drivers compatible.
209 * For example, a single prefix info (N=1):
210 * static const struct pmic_child_info bind_info[] = {
211 * { .prefix = "ldo", .driver = "ldo_driver" },
215 * This function is useful for regulator sub-nodes:
218 * (pmic - bind automatically by compatible)
219 * compatible = "my_pmic";
221 * (pmic's childs - bind by pmic_bind_children())
222 * (nodes prefix: "ldo", driver: "my_regulator_ldo")
226 * (nodes prefix: "buck", driver: "my_regulator_buck")
231 int pmic_bind_children(struct udevice *pmic, ofnode parent,
232 const struct pmic_child_info *child_info);
235 * pmic_get: get the pmic device using its name
237 * @name - device name
238 * @devp - returned pointer to the pmic device
239 * Return: 0 on success or negative value of errno.
241 * The returned devp device can be used with pmic_read/write calls
243 int pmic_get(const char *name, struct udevice **devp);
246 * pmic_reg_count: get the pmic register count
248 * The required pmic device can be obtained by 'pmic_get()'
250 * @dev - pointer to the UCLASS_PMIC device
251 * Return: register count value on success or negative value of errno.
253 int pmic_reg_count(struct udevice *dev);
256 * pmic_read/write: read/write to the UCLASS_PMIC device
258 * The required pmic device can be obtained by 'pmic_get()'
260 * @pmic - pointer to the UCLASS_PMIC device
261 * @reg - device register offset
262 * @buffer - pointer to read/write buffer
263 * @len - byte count for read/write
264 * Return: 0 on success or negative value of errno.
266 int pmic_read(struct udevice *dev, uint reg, uint8_t *buffer, int len);
267 int pmic_write(struct udevice *dev, uint reg, const uint8_t *buffer, int len);
270 * pmic_reg_read() - read a PMIC register value
272 * @dev: PMIC device to read
273 * @reg: Register to read
274 * Return: value read on success or negative value of errno.
276 int pmic_reg_read(struct udevice *dev, uint reg);
279 * pmic_reg_write() - write a PMIC register value
281 * @dev: PMIC device to write
282 * @reg: Register to write
283 * @value: Value to write
284 * Return: 0 on success or negative value of errno.
286 int pmic_reg_write(struct udevice *dev, uint reg, uint value);
289 * pmic_clrsetbits() - clear and set bits in a PMIC register
291 * This reads a register, optionally clears some bits, optionally sets some
292 * bits, then writes the register.
294 * @dev: PMIC device to update
295 * @reg: Register to update
296 * @clr: Bit mask to clear (set those bits that you want cleared)
297 * @set: Bit mask to set (set those bits that you want set)
298 * Return: 0 on success or negative value of errno.
300 int pmic_clrsetbits(struct udevice *dev, uint reg, uint clr, uint set);
303 * This structure holds the private data for PMIC uclass
304 * For now we store information about the number of bytes
305 * being sent at once to the device.
307 struct uc_pmic_priv {
313 /* TODO: Change to CONFIG_IS_ENABLED(DM_PMIC) when SPL_DM_PMIC exists */
314 #if CONFIG_IS_ENABLED(POWER_LEGACY)
316 /* Legacy API, do not use */
317 int pmic_init(unsigned char bus);
318 int power_init_board(void);
319 int pmic_dialog_init(unsigned char bus);
320 int check_reg(struct pmic *p, u32 reg);
321 struct pmic *pmic_alloc(void);
322 struct pmic *pmic_get(const char *s);
323 int pmic_probe(struct pmic *p);
324 int pmic_reg_read(struct pmic *p, u32 reg, u32 *val);
325 int pmic_reg_write(struct pmic *p, u32 reg, u32 val);
326 int pmic_set_output(struct pmic *p, u32 reg, int ldo, int on);
327 #endif /* CONFIG_IS_ENABLED(POWER_LEGACY) */
329 #define pmic_i2c_addr (p->hw.i2c.addr)
330 #define pmic_i2c_tx_num (p->hw.i2c.tx_num)
332 #define pmic_spi_bitlen (p->hw.spi.bitlen)
333 #define pmic_spi_flags (p->hw.spi.flags)
335 #endif /* __CORE_PMIC_H_ */