imx6ul ECSPI Word Delay in Linux SPI API

ibrahimbb — Tue, 21 May 2024 07:42:09 GMT

Hi, I'm trying to write a Linux module for an accel with SPI with imx6ul applications processor. For some reason, I needed to use word_delay of SPI API.

I'm setting word length to 8 bits, and setting word delay to 25 usecs. As a fact, I do not expect word delay to be exactly 25 usecs because of the scheduling but I want it to be at least 25 usecs. Still, this seems to have absolutely no effect on anything and delay between words is generally ~5 usecs (1MHz SCLK). So this made me wonder if there is such implementation in spi-imx driver.

The code:

spi->word_delay.value = 25;

spi->word_delay.unit = SPI_DELAY_UNIT_USECS;

spi->bits_per_word = 8;

spi_setup(spi);

I'm using lf-6.1.y. Have anyone has any such experience? Thanks.

Re: imx6ul ECSPI Word Delay in Linux SPI API

Zhiming_Liu — Thu, 23 May 2024 05:36:29 GMT

There is no such function in spi-imx driver, you can try to use lower speed in device tree.

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imx6ul ECSPI Word Delay in Linux SPI API

Re: imx6ul ECSPI Word Delay in Linux SPI API