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| author | Stefan Lengfeld <contact@stefanchrist.eu> | 2020-12-08 20:53:38 +0200 |
|---|---|---|
| committer | Igor Opaniuk <igor.opaniuk@toradex.com> | 2020-12-08 21:05:25 +0200 |
| commit | 5817454449802e0b55f914e4fa21049cbfe780d0 (patch) | |
| tree | 79affa00b528dd63d22f5ea0637a648183f0cbc4 /samples | |
| parent | d0cdd508dba642622990f3ca9c01a0b6521ec1fd (diff) | |
i2c: imx: implement master_xfer_atomic callback
Rework the read and write code paths in the driver to support operation
in atomic contexts. To achieve this, the driver must not rely on IRQs
and not call schedule(), e.g. via a sleep routine, in these cases.
With this patch the driver supports normal operation, DMA transfers and
now the polling mode or also called sleep-free or IRQ-less operation. It
makes the code not simpler or easier to read, but atomic I2C transfers
are needed on some hardware configurations, e.g. to trigger reboots on
an external PMIC chip.
Related-to: ELB-3308
Related-to: ELB-1403
Signed-off-by: Stefan Lengfeld <contact@stefanchrist.eu>
[m.felsch@pengutronix.de: integrate https://patchwork.ozlabs.org/patch/1085943/ review feedback]
[m.felsch@pengutronix.de: adapt commit message]
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Stefan Agner <stefan@agner.ch>
Tested-by: Stefan Lengfeld <contact@stefanchrist.eu>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
(cherry picked from commit 3a5ee18d2a32bda6b9a1260136f6805848e3839d)
Diffstat (limited to 'samples')
0 files changed, 0 insertions, 0 deletions