tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1* Cadence Quad SPI controller
2
3Required properties:
4- compatible : Should be "cdns,qspi-nor".
5- reg : Contains two entries, each of which is a tuple consisting of a
6 physical address and length. The first entry is the address and
7 length of the controller register set. The second entry is the
8 address and length of the QSPI Controller data area.
9- interrupts : Unit interrupt specifier for the controller interrupt.
10- clocks : phandle to the Quad SPI clock.
11- cdns,fifo-depth : Size of the data FIFO in words.
12- cdns,fifo-width : Bus width of the data FIFO in bytes.
13- cdns,trigger-address : 32-bit indirect AHB trigger address.
14
15Optional properties:
16- cdns,is-decoded-cs : Flag to indicate whether decoder is used or not.
17
18Optional subnodes:
19Subnodes of the Cadence Quad SPI controller are spi slave nodes with additional
20custom properties:
21- cdns,read-delay : Delay for read capture logic, in clock cycles
22- cdns,tshsl-ns : Delay in nanoseconds for the length that the master
23 mode chip select outputs are de-asserted between
24 transactions.
25- cdns,tsd2d-ns : Delay in nanoseconds between one chip select being
26 de-activated and the activation of another.
27- cdns,tchsh-ns : Delay in nanoseconds between last bit of current
28 transaction and deasserting the device chip select
29 (qspi_n_ss_out).
30- cdns,tslch-ns : Delay in nanoseconds between setting qspi_n_ss_out low
31 and first bit transfer.
32
33Example:
34
35 qspi: spi@ff705000 {
36 compatible = "cdns,qspi-nor";
37 #address-cells = <1>;
38 #size-cells = <0>;
39 reg = <0xff705000 0x1000>,
40 <0xffa00000 0x1000>;
41 interrupts = <0 151 4>;
42 clocks = <&qspi_clk>;
43 cdns,is-decoded-cs;
44 cdns,fifo-depth = <128>;
45 cdns,fifo-width = <4>;
46 cdns,trigger-address = <0x00000000>;
47
48 flash0: n25q00@0 {
49 ...
50 cdns,read-delay = <4>;
51 cdns,tshsl-ns = <50>;
52 cdns,tsd2d-ns = <50>;
53 cdns,tchsh-ns = <4>;
54 cdns,tslch-ns = <4>;
55 };
56 };