i2c: imx: Synthesize end of transaction events without idle interrupts

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Only the Layerscape SoCs have interrupts on bus idle, which facilitate
sending events which complete slave bus transactions.

Add support for synthesizing missing events. If we see a master request,
or a newly addressed slave request, if the last event sent to the backend
was I2C_SLAVE_READ_REQUESTED, send the backend a I2C_SLAVE_READ_PROCESSED
followed by I2C_SLAVE_STOP. For all other events, send an I2C_SLAVE_STOP.

Signed-off-by: Kevin Paul Herbert <kph@platinasystems.com>
Tested-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

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Kevin Paul Herbert 2020-12-22 11:48:50 -08:00 • committed by Wolfram Sang

parent e0371298dd

commit 05ae60bc24

1 changed files with 52 additions and 7 deletions

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drivers/i2c/busses/i2c-imx.c

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