04868b407b
Qualcom processors use proprietary bus to talk with PMIC devices - SPMI (System Power Management Interface). On wiring level it is similar to I2C, but on protocol level, it's multi-master and has simple autodetection capabilities. This commit adds simple uclass that provides bus read/write interface. Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
#ifndef _SPMI_SPMI_H
|
|
#define _SPMI_SPMI_H
|
|
|
|
/**
|
|
* struct dm_spmi_ops - SPMI device I/O interface
|
|
*
|
|
* Should be implemented by UCLASS_SPMI device drivers. The standard
|
|
* device operations provides the I/O interface for it's childs.
|
|
*
|
|
* @read: read register 'reg' of slave 'usid' and peripheral 'pid'
|
|
* @write: write register 'reg' of slave 'usid' and peripheral 'pid'
|
|
*
|
|
* Each register is 8-bit, both read and write can return negative values
|
|
* on error.
|
|
*/
|
|
struct dm_spmi_ops {
|
|
int (*read)(struct udevice *dev, int usid, int pid, int reg);
|
|
int (*write)(struct udevice *dev, int usid, int pid, int reg,
|
|
uint8_t value);
|
|
};
|
|
|
|
/**
|
|
* spmi_reg_read() - read a register from specific slave/peripheral
|
|
*
|
|
* @dev: SPMI bus to read
|
|
* @usid SlaveID
|
|
* @pid Peripheral ID
|
|
* @reg: Register to read
|
|
* @return value read on success or negative value of errno.
|
|
*/
|
|
int spmi_reg_read(struct udevice *dev, int usid, int pid, int reg);
|
|
|
|
/**
|
|
* spmi_reg_write() - write a register of specific slave/peripheral
|
|
*
|
|
* @dev: SPMI bus to write
|
|
* @usid SlaveID
|
|
* @pid Peripheral ID
|
|
* @reg: Register to write
|
|
* @value: Value to write
|
|
* @return 0 on success or negative value of errno.
|
|
*/
|
|
int spmi_reg_write(struct udevice *dev, int usid, int pid, int reg,
|
|
uint8_t value);
|
|
|
|
#endif
|