i2c: at91: implement i2c bus recovery

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Implement i2c bus recovery when slaves devices might hold SDA low.
In this case re-assign SCL/SDA to gpios and issue 9 dummy clock pulses
until the slave release SDA.

Signed-off-by: Kamel Bouhara <kamel.bouhara@bootlin.com>
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

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Kamel Bouhara 2020-01-15 13:54:18 +02:00 • committed by Wolfram Sang

parent 19e5cef058

commit d3d3fdcc4c

2 changed files with 82 additions and 0 deletions

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78

drivers/i2c/busses/i2c-at91-master.c

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4

drivers/i2c/busses/i2c-at91.h

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