i.MX Framebuffer: Use readl/writel instead of direct pointer deref
This patch prepares the current i.MX1 framebuffer driver for usage in the whole i.MX family. It switches to readl/writel for register accesses. Also it moves the register definitions to the driver where they belong. Acked-by: NKrzysztof Helt <krzysztof.h1@poczta.fm> Signed-off-by: NJuergen Beisert <j.beisert@pengutronix.de> Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>
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