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Support for displays without DC pin? #79

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@Rajssss

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@Rajssss

In menuconfig, there is a option to enable or disable the DC. However I beleive none of the drivers implemented it. Having such functionality will improve the usability of the driver, saving one more pin, and support Displays modules with no DC pin exposed.
Even though, I had hard time finding a driver which works without a DC pin, but found some hints to a 9-Bit SPI mode?

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