[Letux-kernel] [PATCH] drivers: gpio: pca953x: add compatibility for pcal6524 and pcal9555a

Andy Shevchenko andy.shevchenko at gmail.com
Fri Mar 30 23:39:44 CEST 2018

On Thu, Mar 29, 2018 at 10:29 PM, H. Nikolaus Schaller
<hns at goldelico.com> wrote:

> Another issue I have fixed is that the pcal6524 has 4 registers per
> bank while the pcal9555a has only 2.

So, you mean it's still in non-working case in Linus' tree?
Please, send patches!

> This is encoded in the address
> constants for the new "L"-registers and has to be taken care of in
> pca953x_read_regs_24() and pca953x_write_regs_24().
> But I still have another problem:
> [    4.808823] pca953x 4-0022: irq 186: unsupported type 8
> [    4.814303] genirq: Setting trigger mode 8 for irq 186 failed (pca953x_irq_set_type+0x0/0xa8)
> This comes from https://elixir.bootlin.com/linux/v4.16-rc7/source/sound/soc/codecs/ts3a227e.c#L314
> It appears that the pca953x driver/interrupt-controller can't handle
> IRQF_TRIGGER_LOW, but that is hard coded into the ts3a227 driver.
> Anyone with knowledge and help about this issue?

This is easy to fix (not read datasheet for better solution though):
emulate it via FALLING (LOW) and RISING (HIGH).

With Best Regards,
Andy Shevchenko

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