soc: imx: gpcv2: wait for ADB400 handshake

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New reference manuals show that there is actually a status bit for
the ADB400 handshake. Add a poll loop to wait for the ADB400 to
acknowledge our request.

[Peng Fan: i.MX8MM has blk ctl module, the handshake can only finish
 after setting blk ctl. The blk ctl driver will set the bus clk bit and
 the handshake will finish there. we just add a delay and suppose the
 handshake will finish after that.]

Tested-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

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Lucas Stach 2021-05-10 12:00:37 +08:00 • committed by Shawn Guo

parent 256f07edbd

commit 58d268619a

1 changed files with 39 additions and 8 deletions

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drivers/soc/imx/gpcv2.c

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