68 lines
2.5 KiB
Plaintext
68 lines
2.5 KiB
Plaintext
* Cadence Quad SPI controller
|
|
|
|
Required properties:
|
|
- compatible : should be one of the following:
|
|
Generic default - "cdns,qspi-nor".
|
|
For TI 66AK2G SoC - "ti,k2g-qspi", "cdns,qspi-nor".
|
|
For TI AM654 SoC - "ti,am654-ospi", "cdns,qspi-nor".
|
|
- reg : Contains two entries, each of which is a tuple consisting of a
|
|
physical address and length. The first entry is the address and
|
|
length of the controller register set. The second entry is the
|
|
address and length of the QSPI Controller data area.
|
|
- interrupts : Unit interrupt specifier for the controller interrupt.
|
|
- clocks : phandle to the Quad SPI clock.
|
|
- cdns,fifo-depth : Size of the data FIFO in words.
|
|
- cdns,fifo-width : Bus width of the data FIFO in bytes.
|
|
- cdns,trigger-address : 32-bit indirect AHB trigger address.
|
|
|
|
Optional properties:
|
|
- cdns,is-decoded-cs : Flag to indicate whether decoder is used or not.
|
|
- cdns,rclk-en : Flag to indicate that QSPI return clock is used to latch
|
|
the read data rather than the QSPI clock. Make sure that QSPI return
|
|
clock is populated on the board before using this property.
|
|
|
|
Optional subnodes:
|
|
Subnodes of the Cadence Quad SPI controller are spi slave nodes with additional
|
|
custom properties:
|
|
- cdns,read-delay : Delay for read capture logic, in clock cycles
|
|
- cdns,tshsl-ns : Delay in nanoseconds for the length that the master
|
|
mode chip select outputs are de-asserted between
|
|
transactions.
|
|
- cdns,tsd2d-ns : Delay in nanoseconds between one chip select being
|
|
de-activated and the activation of another.
|
|
- cdns,tchsh-ns : Delay in nanoseconds between last bit of current
|
|
transaction and deasserting the device chip select
|
|
(qspi_n_ss_out).
|
|
- cdns,tslch-ns : Delay in nanoseconds between setting qspi_n_ss_out low
|
|
and first bit transfer.
|
|
- resets : Must contain an entry for each entry in reset-names.
|
|
See ../reset/reset.txt for details.
|
|
- reset-names : Must include either "qspi" and/or "qspi-ocp".
|
|
|
|
Example:
|
|
|
|
qspi: spi@ff705000 {
|
|
compatible = "cdns,qspi-nor";
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
reg = <0xff705000 0x1000>,
|
|
<0xffa00000 0x1000>;
|
|
interrupts = <0 151 4>;
|
|
clocks = <&qspi_clk>;
|
|
cdns,is-decoded-cs;
|
|
cdns,fifo-depth = <128>;
|
|
cdns,fifo-width = <4>;
|
|
cdns,trigger-address = <0x00000000>;
|
|
resets = <&rst QSPI_RESET>, <&rst QSPI_OCP_RESET>;
|
|
reset-names = "qspi", "qspi-ocp";
|
|
|
|
flash0: n25q00@0 {
|
|
...
|
|
cdns,read-delay = <4>;
|
|
cdns,tshsl-ns = <50>;
|
|
cdns,tsd2d-ns = <50>;
|
|
cdns,tchsh-ns = <4>;
|
|
cdns,tslch-ns = <4>;
|
|
};
|
|
};
|