Lines Matching +full:pins +full:- +full:sda +full:- +full:scl

1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
32  * Helper code to recover a hung i2c bus by bit-banging a recovery sequence.
35  * The most common cause is a partially-completed transaction such as rebooting
44  * embedded i2c controllers, the i2c pins can be temporarily reassigned as gpio
45  * pins to do the bus recovery, then can be assigned back to the i2c hardware.
58 iic_recover_bus(struct iicrb_pin_access *pins)  in iic_recover_bus()  argument
67 	pins->setsda(pins->ctx, 1);  in iic_recover_bus()
68 	pins->setscl(pins->ctx, 1);  in iic_recover_bus()
71 	 * At this point, SCL should be high.  If it's not, some slave on the  in iic_recover_bus()
72 	 * bus is doing clock-stretching and we should wait a while.  If that  in iic_recover_bus()
75 	 * cheap eeprom has a max post-write delay of only 10ms), and also long  in iic_recover_bus()
79 		if (pins->getscl(pins->ctx))  in iic_recover_bus()
96 		if (pins->getsda(pins->ctx))  in iic_recover_bus()
100 		pins->setscl(pins->ctx, 0);  in iic_recover_bus()
102 		pins->setscl(pins->ctx, 1);  in iic_recover_bus()
111 	 *  - START: SDA transitions high->low while SCL remains high.  in iic_recover_bus()
112 	 *  - STOP:  SDA transitions low->high while SCL remains high.  in iic_recover_bus()
116 	pins->setsda(pins->ctx, 0);  in iic_recover_bus()
118 	pins->setsda(pins->ctx, 1);  in iic_recover_bus()