1Binding for MTK SPI controller
2
3Required properties:
4- compatible: should be one of the following.
5    - mediatek,mt8173-spi: for mt8173 platforms
6    - mediatek,mt8135-spi: for mt8135 platforms
7    - mediatek,mt6589-spi: for mt6589 platforms
8
9- #address-cells: should be 1.
10
11- #size-cells: should be 0.
12
13- reg: Address and length of the register set for the device
14
15- interrupts: Should contain spi interrupt
16
17- clocks: phandles to input clocks.
18  The first should be one of the following. It's PLL.
19   -  <&clk26m>: specify parent clock 26MHZ.
20   -  <&topckgen CLK_TOP_SYSPLL3_D2>: specify parent clock 109MHZ.
21				      It's the default one.
22   -  <&topckgen CLK_TOP_SYSPLL4_D2>: specify parent clock 78MHZ.
23   -  <&topckgen CLK_TOP_UNIVPLL2_D4>: specify parent clock 104MHZ.
24   -  <&topckgen CLK_TOP_UNIVPLL1_D8>: specify parent clock 78MHZ.
25  The second should be <&topckgen CLK_TOP_SPI_SEL>. It's clock mux.
26  The third is <&pericfg CLK_PERI_SPI0>. It's clock gate.
27
28- clock-names: shall be "parent-clk" for the parent clock, "sel-clk" for the
29  muxes clock, and "spi-clk" for the clock gate.
30
31Optional properties:
32-cs-gpios: see spi-bus.txt, only required for MT8173.
33
34- mediatek,pad-select: specify which pins group(ck/mi/mo/cs) spi
35  controller used. This is a array, the element value should be 0~3,
36  only required for MT8173.
37    0: specify GPIO69,70,71,72 for spi pins.
38    1: specify GPIO102,103,104,105 for spi pins.
39    2: specify GPIO128,129,130,131 for spi pins.
40    3: specify GPIO5,6,7,8 for spi pins.
41
42Example:
43
44- SoC Specific Portion:
45spi: spi@1100a000 {
46	compatible = "mediatek,mt8173-spi";
47	#address-cells = <1>;
48	#size-cells = <0>;
49	reg = <0 0x1100a000 0 0x1000>;
50	interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_LOW>;
51	clocks = <&topckgen CLK_TOP_SYSPLL3_D2>,
52		 <&topckgen CLK_TOP_SPI_SEL>,
53		 <&pericfg CLK_PERI_SPI0>;
54	clock-names = "parent-clk", "sel-clk", "spi-clk";
55	cs-gpios = <&pio 105 GPIO_ACTIVE_LOW>, <&pio 72 GPIO_ACTIVE_LOW>;
56	mediatek,pad-select = <1>, <0>;
57	status = "disabled";
58};
59