0001 * EMIF family of TI SDRAM controllers
0002
0003 EMIF - External Memory Interface - is an SDRAM controller used in
0004 TI SoCs. EMIF supports, based on the IP revision, one or more of
0005 DDR2/DDR3/LPDDR2 protocols. This binding describes a given instance
0006 of the EMIF IP and memory parts attached to it. Certain revisions
0007 of the EMIF controller also contain optional ECC support, which
0008 corrects one bit errors and detects two bit errors.
0009
0010 Required properties:
0011 - compatible : Should be of the form "ti,emif-<ip-rev>" where <ip-rev>
0012 is the IP revision of the specific EMIF instance. For newer controllers,
0013 compatible should be one of the following:
0014 "ti,emif-am3352"
0015 "ti,emif-am4372"
0016 "ti,emif-dra7xx"
0017 "ti,emif-keystone"
0018
0019 - phy-type : <u32> indicating the DDR phy type. Following are the
0020 allowed values
0021 <1> : Attila PHY
0022 <2> : Intelli PHY
0023
0024 - device-handle : phandle to a "lpddr2" node representing the memory part
0025
0026 - ti,hwmods : For TI hwmods processing and omap device creation
0027 the value shall be "emif<n>" where <n> is the number of the EMIF
0028 instance with base 1.
0029 - interrupts : interrupt used by the controller
0030
0031 Required only for "ti,emif-am3352" and "ti,emif-am4372":
0032 - sram : Phandles for generic sram driver nodes,
0033 first should be type 'protect-exec' for the driver to use to copy
0034 and run PM functions, second should be regular pool to be used for
0035 data region for code. See Documentation/devicetree/bindings/sram/sram.yaml
0036 for more details.
0037
0038 Optional properties:
0039 - cs1-used : Have this property if CS1 of this EMIF
0040 instance has a memory part attached to it. If there is a memory
0041 part attached to CS1, it should be the same type as the one on CS0,
0042 so there is no need to give the details of this memory part.
0043
0044 - cal-resistor-per-cs : Have this property if the board has one
0045 calibration resistor per chip-select.
0046
0047 - hw-caps-read-idle-ctrl: Have this property if the controller
0048 supports read idle window programming
0049
0050 - hw-caps-dll-calib-ctrl: Have this property if the controller
0051 supports dll calibration control
0052
0053 - hw-caps-ll-interface : Have this property if the controller
0054 has a low latency interface and corresponding interrupt events
0055
0056 - hw-caps-temp-alert : Have this property if the controller
0057 has capability for generating SDRAM temperature alerts
0058
0059 -Examples:
0060
0061 emif1: emif@4c000000 {
0062 compatible = "ti,emif-4d";
0063 ti,hwmods = "emif2";
0064 phy-type = <1>;
0065 device-handle = <&elpida_ECB240ABACN>;
0066 cs1-used;
0067 hw-caps-read-idle-ctrl;
0068 hw-caps-ll-interface;
0069 hw-caps-temp-alert;
0070 };
0071
0072 /* From am33xx.dtsi */
0073 emif: emif@4c000000 {
0074 compatible = "ti,emif-am3352";
0075 reg = <0x4C000000 0x1000>;
0076 sram = <&pm_sram_code
0077 &pm_sram_data>;
0078 };
0079
0080 emif1: emif@4c000000 {
0081 compatible = "ti,emif-dra7xx";
0082 reg = <0x4c000000 0x200>;
0083 interrupts = <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>;
0084 };
