98 lines
3.4 KiB
Plaintext
98 lines
3.4 KiB
Plaintext
|
Device tree bindings for Ethernet chip connected to TI GPMC
|
||
|
|
|
||
|
|
Besides being used to interface with external memory devices, the
|
||
|
|
General-Purpose Memory Controller can be used to connect Pseudo-SRAM devices
|
||
|
|
such as ethernet controllers to processors using the TI GPMC as a data bus.
|
||
|
|
|
||
|
|
Ethernet controllers connected to TI GPMC are represented as child nodes of
|
||
|
|
the GPMC controller with an "ethernet" name.
|
||
|
|
|
||
|
|
All timing relevant properties as well as generic GPMC child properties are
|
||
|
|
explained in a separate documents. Please refer to
|
||
|
|
Documentation/devicetree/bindings/memory-controllers/omap-gpmc.txt
|
||
|
|
|
||
|
|
For the properties relevant to the ethernet controller connected to the GPMC
|
||
|
|
refer to the binding documentation of the device. For example, the documentation
|
||
|
|
for the SMSC 911x is Documentation/devicetree/bindings/net/smsc911x.txt
|
||
|
|
|
||
|
|
Child nodes need to specify the GPMC bus address width using the "bank-width"
|
||
|
|
property but is possible that an ethernet controller also has a property to
|
||
|
|
specify the I/O registers address width. Even when the GPMC has a maximum 16-bit
|
||
|
|
address width, it supports devices with 32-bit word registers.
|
||
|
|
For example with an SMSC LAN911x/912x controller connected to the TI GPMC on an
|
||
|
|
OMAP2+ board, "bank-width = <2>;" and "reg-io-width = <4>;".
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
- bank-width: Address width of the device in bytes. GPMC supports 8-bit
|
||
|
|
and 16-bit devices and so must be either 1 or 2 bytes.
|
||
|
|
- compatible: Compatible string property for the ethernet child device.
|
||
|
|
- gpmc,cs-on-ns: Chip-select assertion time
|
||
|
|
- gpmc,cs-rd-off-ns: Chip-select de-assertion time for reads
|
||
|
|
- gpmc,cs-wr-off-ns: Chip-select de-assertion time for writes
|
||
|
|
- gpmc,oe-on-ns: Output-enable assertion time
|
||
|
|
- gpmc,oe-off-ns: Output-enable de-assertion time
|
||
|
|
- gpmc,we-on-ns: Write-enable assertion time
|
||
|
|
- gpmc,we-off-ns: Write-enable de-assertion time
|
||
|
|
- gpmc,access-ns: Start cycle to first data capture (read access)
|
||
|
|
- gpmc,rd-cycle-ns: Total read cycle time
|
||
|
|
- gpmc,wr-cycle-ns: Total write cycle time
|
||
|
|
- reg: Chip-select, base address (relative to chip-select)
|
||
|
|
and size of the memory mapped for the device.
|
||
|
|
Note that base address will be typically 0 as this
|
||
|
|
is the start of the chip-select.
|
||
|
|
|
||
|
|
Optional properties:
|
||
|
|
- gpmc,XXX Additional GPMC timings and settings parameters. See
|
||
|
|
Documentation/devicetree/bindings/memory-controllers/omap-gpmc.txt
|
||
|
|
|
||
|
|
Example:
|
||
|
|
|
||
|
|
gpmc: gpmc@6e000000 {
|
||
|
|
compatible = "ti,omap3430-gpmc";
|
||
|
|
ti,hwmods = "gpmc";
|
||
|
|
reg = <0x6e000000 0x1000>;
|
||
|
|
interrupts = <20>;
|
||
|
|
gpmc,num-cs = <8>;
|
||
|
|
gpmc,num-waitpins = <4>;
|
||
|
|
#address-cells = <2>;
|
||
|
|
#size-cells = <1>;
|
||
|
|
|
||
|
|
ranges = <5 0 0x2c000000 0x1000000>;
|
||
|
|
|
||
|
|
ethernet@5,0 {
|
||
|
|
compatible = "smsc,lan9221", "smsc,lan9115";
|
||
|
|
reg = <5 0 0xff>;
|
||
|
|
bank-width = <2>;
|
||
|
|
|
||
|
|
gpmc,mux-add-data;
|
||
|
|
gpmc,cs-on-ns = <0>;
|
||
|
|
gpmc,cs-rd-off-ns = <186>;
|
||
|
|
gpmc,cs-wr-off-ns = <186>;
|
||
|
|
gpmc,adv-on-ns = <12>;
|
||
|
|
gpmc,adv-rd-off-ns = <48>;
|
||
|
|
gpmc,adv-wr-off-ns = <48>;
|
||
|
|
gpmc,oe-on-ns = <54>;
|
||
|
|
gpmc,oe-off-ns = <168>;
|
||
|
|
gpmc,we-on-ns = <54>;
|
||
|
|
gpmc,we-off-ns = <168>;
|
||
|
|
gpmc,rd-cycle-ns = <186>;
|
||
|
|
gpmc,wr-cycle-ns = <186>;
|
||
|
|
gpmc,access-ns = <114>;
|
||
|
|
gpmc,page-burst-access-ns = <6>;
|
||
|
|
gpmc,bus-turnaround-ns = <12>;
|
||
|
|
gpmc,cycle2cycle-delay-ns = <18>;
|
||
|
|
gpmc,wr-data-mux-bus-ns = <90>;
|
||
|
|
gpmc,wr-access-ns = <186>;
|
||
|
|
gpmc,cycle2cycle-samecsen;
|
||
|
|
gpmc,cycle2cycle-diffcsen;
|
||
|
|
|
||
|
|
interrupt-parent = <&gpio6>;
|
||
|
|
interrupts = <16>;
|
||
|
|
vmmc-supply = <&vddvario>;
|
||
|
|
vmmc_aux-supply = <&vdd33a>;
|
||
|
|
reg-io-width = <4>;
|
||
|
|
|
||
|
|
smsc,save-mac-address;
|
||
|
|
};
|
||
|
|
};
|