On Sat, Jun 01, 2019 at 12:37:56AM +0200, Linus Walleij wrote: > The IOP3xx has some elaborate code to directly slam the > GPIO lines multiplexed with I2C down low before enablement, > apparently a workaround for a hardware bug found in the > early chips. > > After consulting the developer documentation for IOP80321 > and IOP80331 I can clearly see that this may be useful for > IOP80321 family (mach-iop32x) but it is highly dubious for > any 80331 series or later chip: in these chips the lines > are not multiplexed for UARTs. > > We convert the code to pass optional GPIO descriptors > and register these only on the 80321-based boards where > it makes sense, optionally obtain them in the driver and > use the gpiod_set_raw_value() to ascertain the line gets > driven low when needed. > > The GPIO driver does not give the GPIO chip a reasonable > label so the patch also adds that so that these machine > descriptor tables can be used. > > Cc: arm@xxxxxxxxxx > Cc: Dan Williams <dan.j.williams@xxxxxxxxx> > Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Added Dan's ack, too, and applied to for-next, thanks!
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