diff options
Diffstat (limited to 'include/power')
| -rw-r--r-- | include/power/pmic.h | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/include/power/pmic.h b/include/power/pmic.h index afbc5aab7e..f7ae78162d 100644 --- a/include/power/pmic.h +++ b/include/power/pmic.h @@ -1,4 +1,7 @@ /* + * Copyright (C) 2014-2015 Samsung Electronics + * Przemyslaw Marczak <p.marczak@samsung.com> + * * Copyright (C) 2011-2012 Samsung Electronics * Lukasz Majewski <l.majewski@samsung.com> * @@ -9,10 +12,13 @@ #define __CORE_PMIC_H_ #include <linux/list.h> +#include <spi.h> #include <i2c.h> #include <power/power_chrg.h> enum { PMIC_I2C, PMIC_SPI, PMIC_NONE}; + +#ifdef CONFIG_POWER enum { I2C_PMIC, I2C_NUM, }; enum { PMIC_READ, PMIC_WRITE, }; enum { PMIC_SENSOR_BYTE_ORDER_LITTLE, PMIC_SENSOR_BYTE_ORDER_BIG, }; @@ -77,7 +83,189 @@ struct pmic { struct pmic *parent; struct list_head list; }; +#endif /* CONFIG_POWER */ + +#ifdef CONFIG_DM_PMIC +/** + * U-Boot PMIC Framework + * ===================== + * + * UCLASS_PMIC - The is designed to provide an I/O interface for PMIC devices. + * + * For the multi-function PMIC devices, this can be used as parent I/O device + * for each IC's interface. Then, each children uses its parent for read/write. + * + * The driver model tree could look like this: + * + *_ root device + * |_ BUS 0 device (e.g. I2C0) - UCLASS_I2C/SPI/... + * | |_ PMIC device (READ/WRITE ops) - UCLASS_PMIC + * | |_ REGULATOR device (ldo/buck/... ops) - UCLASS_REGULATOR + * | |_ CHARGER device (charger ops) - UCLASS_CHARGER (in the future) + * | |_ MUIC device (microUSB connector ops) - UCLASS_MUIC (in the future) + * | |_ ... + * | + * |_ BUS 1 device (e.g. I2C1) - UCLASS_I2C/SPI/... + * |_ PMIC device (READ/WRITE ops) - UCLASS_PMIC + * |_ RTC device (rtc ops) - UCLASS_RTC (in the future) + * + * We can find two PMIC cases in boards design: + * - single I/O interface + * - multiple I/O interfaces + * We bind single PMIC device for each interface, to provide an I/O as a parent, + * of proper child devices. Each child usually implements a different function, + * controlled by the same interface. + * + * The binding should be done automatically. If device tree nodes/subnodes are + * proper defined, then: + * + * |_ the ROOT driver will bind the device for I2C/SPI node: + * |_ the I2C/SPI driver should bind a device for pmic node: + * |_ the PMIC driver should bind devices for its childs: + * |_ regulator (child) + * |_ charger (child) + * |_ other (child) + * + * The same for other device nodes, for multi-interface PMIC. + * + * Note: + * Each PMIC interface driver should use a different compatible string. + * + * If each pmic child device driver need access the PMIC-specific registers, + * it need know only the register address and the access can be done through + * the parent pmic driver. Like in the example: + * + *_ root driver + * |_ dev: bus I2C0 - UCLASS_I2C + * | |_ dev: my_pmic (read/write) (is parent) - UCLASS_PMIC + * | |_ dev: my_regulator (set value/etc..) (is child) - UCLASS_REGULATOR + * + * To ensure such device relationship, the pmic device driver should also bind + * all its child devices, like in the example below. It should be done by call + * the 'pmic_bind_childs()' - please refer to the description of this function + * in this header file. This function, should be called in the driver's '.bind' + * method. + * + * For the example driver, please refer the MAX77686 driver: + * - 'drivers/power/pmic/max77686.c' + */ + +/** + * struct dm_pmic_ops - PMIC device I/O interface + * + * Should be implemented by UCLASS_PMIC device drivers. The standard + * device operations provides the I/O interface for it's childs. + * + * @reg_count: devices register count + * @read: read 'len' bytes at "reg" and store it into the 'buffer' + * @write: write 'len' bytes from the 'buffer' to the register at 'reg' address + */ +struct dm_pmic_ops { + int reg_count; + int (*read)(struct udevice *dev, uint reg, uint8_t *buffer, int len); + int (*write)(struct udevice *dev, uint reg, const uint8_t *buffer, + int len); +}; + +/* enum pmic_op_type - used for various pmic devices operation calls, + * for reduce a number of lines with the same code for read/write or get/set. + * + * @PMIC_OP_GET - get operation + * @PMIC_OP_SET - set operation +*/ +enum pmic_op_type { + PMIC_OP_GET, + PMIC_OP_SET, +}; + +/** + * struct pmic_child_info - basic device's child info for bind child nodes with + * the driver by the node name prefix and driver name. This is a helper struct + * for function: pmic_bind_childs(). + * + * @prefix - child node name prefix (or its name if is unique or single) + * @driver - driver name for the sub-node with prefix + */ +struct pmic_child_info { + const char *prefix; + const char *driver; +}; + +/* drivers/power/pmic-uclass.c */ + +/** + * pmic_bind_childs() - bind drivers for given parent pmic, using child info + * found in 'child_info' array. + * + * @pmic - pmic device - the parent of found child's + * @child_info - N-childs info array + * @return a positive number of childs, or 0 if no child found (error) + * + * Note: For N-childs the child_info array should have N+1 entries and the last + * entry prefix should be NULL - the same as for drivers compatible. + * + * For example, a single prefix info (N=1): + * static const struct pmic_child_info bind_info[] = { + * { .prefix = "ldo", .driver = "ldo_driver" }, + * { }, + * }; + * + * This function is useful for regulator sub-nodes: + * my_regulator@0xa { + * reg = <0xa>; + * (pmic - bind automatically by compatible) + * compatible = "my_pmic"; + * ... + * (pmic's childs - bind by pmic_bind_childs()) + * (nodes prefix: "ldo", driver: "my_regulator_ldo") + * ldo1 { ... }; + * ldo2 { ... }; + * + * (nodes prefix: "buck", driver: "my_regulator_buck") + * buck1 { ... }; + * buck2 { ... }; + * }; + */ +int pmic_bind_childs(struct udevice *pmic, int offset, + const struct pmic_child_info *child_info); + +/** + * pmic_get: get the pmic device using its name + * + * @name - device name + * @devp - returned pointer to the pmic device + * @return 0 on success or negative value of errno. + * + * The returned devp device can be used with pmic_read/write calls + */ +int pmic_get(const char *name, struct udevice **devp); + +/** + * pmic_reg_count: get the pmic register count + * + * The required pmic device can be obtained by 'pmic_get()' + * + * @dev - pointer to the UCLASS_PMIC device + * @return register count value on success or negative value of errno. + */ +int pmic_reg_count(struct udevice *dev); + +/** + * pmic_read/write: read/write to the UCLASS_PMIC device + * + * The required pmic device can be obtained by 'pmic_get()' + * + * @pmic - pointer to the UCLASS_PMIC device + * @reg - device register offset + * @buffer - pointer to read/write buffer + * @len - byte count for read/write + * @return 0 on success or negative value of errno. + */ +int pmic_read(struct udevice *dev, uint reg, uint8_t *buffer, int len); +int pmic_write(struct udevice *dev, uint reg, const uint8_t *buffer, int len); +#endif /* CONFIG_DM_PMIC */ +#ifdef CONFIG_POWER int pmic_init(unsigned char bus); int power_init_board(void); int pmic_dialog_init(unsigned char bus); @@ -88,6 +276,7 @@ int pmic_probe(struct pmic *p); int pmic_reg_read(struct pmic *p, u32 reg, u32 *val); int pmic_reg_write(struct pmic *p, u32 reg, u32 val); int pmic_set_output(struct pmic *p, u32 reg, int ldo, int on); +#endif #define pmic_i2c_addr (p->hw.i2c.addr) #define pmic_i2c_tx_num (p->hw.i2c.tx_num) |