mirror of https://gitee.com/openkylin/linux.git
52 lines
1.6 KiB
Plaintext
52 lines
1.6 KiB
Plaintext
* Aspeed Firmware Memory controller
|
|
* Aspeed SPI Flash Memory Controller
|
|
|
|
The Firmware Memory Controller in the Aspeed AST2500 SoC supports
|
|
three chip selects, two of which are always of SPI type and the third
|
|
can be SPI or NOR type flash. These bindings only describe SPI.
|
|
|
|
The two SPI flash memory controllers in the AST2500 each support two
|
|
chip selects.
|
|
|
|
Required properties:
|
|
- compatible : Should be one of
|
|
"aspeed,ast2400-fmc" for the AST2400 Firmware Memory Controller
|
|
"aspeed,ast2400-spi" for the AST2400 SPI Flash memory Controller
|
|
"aspeed,ast2500-fmc" for the AST2500 Firmware Memory Controller
|
|
"aspeed,ast2500-spi" for the AST2500 SPI flash memory controllers
|
|
|
|
- reg : the first contains the control register location and length,
|
|
the second contains the memory window mapping address and length
|
|
- #address-cells : must be 1 corresponding to chip select child binding
|
|
- #size-cells : must be 0 corresponding to chip select child binding
|
|
|
|
Optional properties:
|
|
- interrupts : Should contain the interrupt for the dma device if an
|
|
FMC
|
|
|
|
The child nodes are the SPI flash modules which must have a compatible
|
|
property as specified in bindings/mtd/jedec,spi-nor.txt
|
|
|
|
Optionally, the child node can contain properties for SPI mode (may be
|
|
ignored):
|
|
- spi-max-frequency - max frequency of spi bus
|
|
|
|
|
|
Example:
|
|
fmc: fmc@1e620000 {
|
|
compatible = "aspeed,ast2500-fmc";
|
|
reg = < 0x1e620000 0x94
|
|
0x20000000 0x02000000 >;
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
interrupts = <19>;
|
|
flash@0 {
|
|
reg = < 0 >;
|
|
compatible = "jedec,spi-nor";
|
|
/* spi-max-frequency = <>; */
|
|
/* m25p,fast-read; */
|
|
#address-cells = <1>;
|
|
#size-cells = <1>;
|
|
};
|
|
};
|