memory: Add TI GPMC driver

The GPMC is a unified memory controller dedicated for interfacing
with external memory devices like
 - Asynchronous SRAM-like memories and ASICs
 - Asynchronous, synchronous, and page mode burst NOR flash
 - NAND flash
 - Pseudo-SRAM devices

This driver will take care of setting up the GPMC based on
the settings specified in the Device tree and then
probe its children.

Signed-off-by: Roger Quadros <rogerq@kernel.org>

drivers/memory/Kconfig

@@ -41,4 +41,23 @@ config TI_AEMIF
 	  of 256M bytes of any of these memories can be accessed at a given
 	  time via four chip selects with 64M byte access per chip select.
 
+config TI_GPMC
+	bool "Texas Instruments GPMC driver"
+	depends on ARCH_OMAP2PLUS || ARCH_KEYSTONE || ARCH_K3
+	depends on MEMORY && CLK && OF_CONTROL
+	help
+	  This driver is for the General Purpose Memory Controller (GPMC)
+          present on Texas Instruments SoCs (e.g. OMAP2+). GPMC allows
+          interfacing to a variety of asynchronous as well as synchronous
+          memory drives like NOR, NAND, OneNAND, SRAM.
+
+if TI_GPMC
+config TI_GPMC_DEBUG
+	bool "Debug Texas Instruments GPMC timings"
+	default n
+	help
+	  Enable this to print GPMC timings before and after the GPMC registers
+	  are programmed. This should not be left enabled on production systems.
+endif
+
 endmenu