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How can I use ECSPI SS1-2?

Question asked by neale buckland on Oct 30, 2018
Latest reply on Oct 31, 2018 by neale buckland

The iMX8m has ECSPI peripherals that according to the reference manual support up to four SS lines. However, in the reference manual I can only find information about how to use SS0 (e.g. via the IOMUXC_SW_MUX_CTL_PAD_ECSPI1_SS0 register for ECSPI1).

Where can I find information about how to use the SS1-SS2 signals?

I have found an example (DART-MX8M SPI - Variscite Wiki ) which suggests that I can use GPIO1_IO12 and GPIO1_IO15, but this doesn't seem to be documented (in the IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO12 and IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO15 registers).