Re: [PATCH 1/2 v2] spi: add SPI_MOSI_IDLE_LOW support from device tree

[Couret Charles-Antoine <charles-antoine.couret@mind.be>]

Hi Marcelo,
Le 29/03/26 à 21:29, Marcelo Schmitt a écrit :
>> For example we used that to communicate with TI DAC161P997 device, where
>> "IDLE low" setting can be used to detect when the device is really powered
>> or not. But this is an optional setting, this option does not affect the
>> rest of the driver.
> Can't that be done with the existing support for idle modes? E.g.
> 		spi->mode |= SPI_MOSI_IDLE_LOW;
> 		ret = spi_setup(spi);
> 		if (ret < 0) {
> 			/* No controller MOSI idle low support. */
> 			/* Can't verify device is powered on. Return or do something else. */
> 		}
> 		/* MOSI idle low support. Verify the device is powered on. */
>
This means we need to hardcode the behaviour in the driver or to add an 
extra setting if we don't especially want to enable this.

I agree with you: there is always a way to deal with it without this 
property in the device tree. However, I don't think this means the 
property in the device tree is irrelevant.

Regards,

-- 

Charles-Antoine Couret

Embedded Software Developer

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