@@ -0,0 +1,134 @@
+Qualcomm External Bus Interface 2 (EBI2)
+
+The EBI2 contains two peripheral blocks: XMEM and LCDC. The XMEM handles any
+external memory (such as NAND or other memory-mapped peripherals) whereas
+LCDC handles LCD displays.
+
+As it says it connects devices to an external bus interface, meaning address
+lines (up to 9 address lines so can only address 1KiB external memory space),
+data lines (16 bits), OE (output enable), ADV (address valid, used on some
+NOR flash memories), WE (write enable). This on top of 6 different chip selects
+(CS0 thru CS5) so that in theory 6 different devices can be connected.
+
+Apparently this bus is clocked at 64MHz. It has dedicated pins on the package
+and the bus can only come out on these pins, however if some of the pins are
+unused they can be left unconnected or remuxed to be used as GPIO or in some
+cases other orthogonal functions as well.
+
+Also CS1 and CS2 has -A and -B signals. Why they have that is unclear to me.
+
+The chip selects have the following memory range assignments. This region of
+memory is referred to as "Chip Peripheral SS FPB0" and is 168MB big.
+
+Chip Select                     Physical address base
+CS0 GPIO134                     0x1a800000-0x1b000000 (8MB)
+CS1 GPIO39 (A) / GPIO123 (B)    0x1b000000-0x1b800000 (8MB)
+CS2 GPIO40 (A) / GPIO124 (B)    0x1b800000-0x1c000000 (8MB)
+CS3 GPIO133                     0x1d000000-0x25000000 (128 MB)
+CS4 GPIO132                     0x1c800000-0x1d000000 (8MB)
+CS5 GPIO131                     0x1c000000-0x1c800000 (8MB)
+
+The APQ8060 Qualcomm Application Processor User Guide, 80-N7150-14 Rev. A,
+August 6, 2012 contains some incomplete documentation of the EBI2.
+
+FIXME: the manual mentions "write precharge cycles" and "precharge cycles".
+We have not been able to figure out which bit fields these correspond to
+in the hardware, or what valid values exist. The current hypothesis is that
+this is something just used on the FAST chip selects and that the SLOW
+chip selects are understood fully. There is also a "byte device enable"
+flag somewhere for 8bit memories.
+
+FIXME: The chipselects have SLOW and FAST configuration registers. It's a bit
+unclear what this means, if they are mutually exclusive or can be used
+together, or if some chip selects are hardwired to be FAST and others are SLOW
+by design.
+
+The XMEM registers are totally undocumented but could be partially decoded
+because the Cypress AN49576 Antioch Westbridge apparently has suspiciously
+similar register layout, see: http://www.cypress.com/file/105771/download
+
+Required properties:
+- compatible: should be "qcom,ebi2"
+- #address-cells: shoule be <1>
+- #size-cells: should be <1>
+- ranges: boolean should be present
+- reg: two ranges of registers: EBI2 config and XMEM config areas
+- reg-names: should be "ebi2", "xmem"
+- clocks: two clocks, EBI_2X and EBI
+- clock-names: shoule be "ebi2x", "ebi2"
+
+Optional subnodes:
+- Nodes inside the EBI2 will be considered chipselect nodes. For each
+  chipselect under the EBI2 node you should have the following required
+  properties:
+
+Required subnode properties:
+- chipselect: <N> where N is the chipselect configured in this node
+- address-cells: should be <1>
+- size-cells: should be <1>
+- ranges: bool should be present
+
+Optional subnode properties for SLOW chip selects:
+- xmem-recovery-cycles: recovery cycles is the time the memory continues to
+  drive the data bus after OE is de-asserted, in order to avoid contention on
+  the data bus. They are inserted when reading one CS and switching to another
+  CS or read followed by write on the same CS. Valid values 0 thru 15. Minimum
+  value is actually 1, so a value of 0 will still yield 1 recovery cycle.
+- xmem-write-hold-cycles: write hold cycles, these are extra cycles inserted
+  after every write minimum 1. The data out is driven from the time WE is
+  asserted until CS is asserted. With a hold of 1 (value = 0), the CS stays
+  active for 1 extra cycle etc. Valid values 0 thru 15.
+- xmem-write-delta-cycles: initial latency for write cycles inserted for the
+  first write to a page or burst memory. Valid values 0 thru 255.
+- xmem-read-delta-cycles: initial latency for read cycles inserted for the
+  first read to a page or burst memory. Valid values 0 thru 255.
+- xmem-write-wait-cycles: number of wait cycles for every write access, 0=1
+  cycle. Valid values 0 thru 15.
+- xmem-read-wait-cycles: number of wait cycles for every read access, 0=1
+  cycle. Valid values 0 thru 15.
+
+Optional subnode properties for FAST chip selects:
+- xmem-address-hold-enable: this is a boolean property stating that we shall
+  holde the address for an extra cycle to meet hold time requirements with ADV
+  assertion.
+- xmem-adv-to-oe-recovery-cycles: the number of cycles elapsed before an OE
+  assertion, with respect to the cycle where ADV (address valid) is asserted.
+  2 means 2 cycles between ADV and OE. Valid values 0, 1, 2 or 3.
+- xmem-read-hold-cycles: the length in cycles of the first segment of a read
+  transfer. For a single read trandfer this will be the time from CS assertion
+  to OE assertion. Valid values 0 thru 15.
+
+Example:
+
+ebi2@1a100000 {
+	compatible = "qcom,ebi2";
+	#address-cells = <1>;
+	#size-cells = <1>;
+	ranges;
+	reg = <0x1a100000 0x1000>, <0x1a110000 0x1000>;
+	reg-names = "ebi2", "xmem";
+	clocks = <&gcc EBI2_2X_CLK>, <&gcc EBI2_CLK>;
+	clock-names = "ebi2x", "ebi2";
+	/* Make sure to set up the pin control for the EBI2 */
+	pinctrl-names = "default";
+	pinctrl-0 = <&foo_ebi2_pins>;
+
+	cs2@1b800000 {
+		chipselect = <2>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+		xmem-recovery-cycles = <0>;
+		xmem-write-hold-cycles = <3>;
+		xmem-write-delta-cycles = <31>;
+		xmem-read-delta-cycles = <28>;
+		xmem-write-wait-cycles = <9>;
+		xmem-read-wait-cycles = <9>;
+
+		foo-ebi2@1b800000 {
+			compatible = "foo";
+			reg = <0x1b800000 0x100>;
+			(...)
+		};
+	};
+};