i2c: stm32f7: Add atomic_xfer method to driver

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commit 470a662688 upstream.

Add an atomic_xfer method to the driver so that it behaves correctly
when controlling a PMIC that is responsible for device shutdown.

The atomic_xfer method added is similar to the one from the i2c-mv64xxx
driver. When running an atomic_xfer a bool flag in the driver data is
set, the interrupt is not unmasked on transfer start, and the IRQ
handler is manually invoked while waiting for pending transfers to
complete.

Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Acked-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Cc: Christoph Niedermaier <cniedermaier@dh-electronics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Sean Nyekjaer 2023-08-16 10:05:52 +02:00 • committed by Greg Kroah-Hartman

parent 2ff51719ec

commit e84f4400bf

1 changed files with 47 additions and 4 deletions

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drivers/i2c/busses/i2c-stm32f7.c

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