SPI Slave Mode GPIO Synchronization

[s.n.3]

I’ll use SPI as slave.
I have found that the title topic is described in the SoC Technical Reference Manual.
Do you have something sample codes to realize GPIO synchronization ?

[KevinFFF]

Hi s.n.3,

Are you asking about how to configure SPI as slave?

@s.n.3

to realize GPIO synchronization

What do you mean about the GPIO synchronization?

[s.n.3]

It’s described in the document as follows.
I’m looking for the sample code to realize this sequence.
Currently, when the SPI write ioctl is done, this is blocking the process.
So I can’t toggle GPIO at the suitable timing.

[KevinFFF]

I’m checking this request with internal and will let you know once there’s any result.

[KevinFFF]

You could refer to nvidia,spi-slave-tegra124.txt document in kernel source for GPIO synchronization.

- nvidia,slave-ready-gpio: OUT GPIO from slave to report slave status. This
 	GPIO, when asserted, implies slave controller is ready for transaction.
 	When this GPIO is de-asserted, the master cannot initiate transaction
 	with this slave.