How to use ESP32 SPI in 4 bit using esp-idf?

[lalitahuja33]

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1. I'm want to use ESP32 SPI in 4 bit mode to drive P10 displays. In my previous code I was driving one P10 tile/display using 1 bit SPI. Now, I want to drive 2 P10 tile/display using the same SPI in 4 bit mode and then 4 P10 tile/display using the same SPI in 4 bit mode.
2. I have enabled (SPI_TRANS_MODE_QIO) flag in spi_transaction_t structure, and SPICOMMON_BUSFLAG_QUAD flag in spi_bus_config_t flag. Now how to change the data arrangement?
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4. Can anyone tell what changes I need to make in SPI functions for this?

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