tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1* Freescale Quad Serial Peripheral Interface(QuadSPI)
2
3Required properties:
4 - compatible : Should be "fsl,vf610-qspi", "fsl,imx6sx-qspi",
5 "fsl,imx7d-qspi", "fsl,imx6ul-qspi",
6 "fsl,ls1021a-qspi"
7 or
8 "fsl,ls2080a-qspi" followed by "fsl,ls1021a-qspi",
9 "fsl,ls1043a-qspi" followed by "fsl,ls1021a-qspi"
10 - reg : the first contains the register location and length,
11 the second contains the memory mapping address and length
12 - reg-names: Should contain the reg names "QuadSPI" and "QuadSPI-memory"
13 - interrupts : Should contain the interrupt for the device
14 - clocks : The clocks needed by the QuadSPI controller
15 - clock-names : Should contain the name of the clocks: "qspi_en" and "qspi".
16
17Required SPI slave node properties:
18 - reg: There are two buses (A and B) with two chip selects each.
19 This encodes to which bus and CS the flash is connected:
20 <0>: Bus A, CS 0
21 <1>: Bus A, CS 1
22 <2>: Bus B, CS 0
23 <3>: Bus B, CS 1
24
25Example:
26
27qspi0: quadspi@40044000 {
28 compatible = "fsl,vf610-qspi";
29 reg = <0x40044000 0x1000>, <0x20000000 0x10000000>;
30 reg-names = "QuadSPI", "QuadSPI-memory";
31 interrupts = <0 24 IRQ_TYPE_LEVEL_HIGH>;
32 clocks = <&clks VF610_CLK_QSPI0_EN>,
33 <&clks VF610_CLK_QSPI0>;
34 clock-names = "qspi_en", "qspi";
35
36 flash0: s25fl128s@0 {
37 ....
38 };
39};
40
41Example showing the usage of two SPI NOR devices on bus A:
42
43&qspi2 {
44 pinctrl-names = "default";
45 pinctrl-0 = <&pinctrl_qspi2>;
46 status = "okay";
47
48 flash0: n25q256a@0 {
49 #address-cells = <1>;
50 #size-cells = <1>;
51 compatible = "micron,n25q256a", "jedec,spi-nor";
52 spi-max-frequency = <29000000>;
53 reg = <0>;
54 };
55
56 flash1: n25q256a@1 {
57 #address-cells = <1>;
58 #size-cells = <1>;
59 compatible = "micron,n25q256a", "jedec,spi-nor";
60 spi-max-frequency = <29000000>;
61 reg = <1>;
62 };
63};