<commit_before>Binding for MTK SPI controller

Required properties:
- compatible: should be one of the following.
    - mediatek,mt8173-spi: for mt8173 platforms
    - mediatek,mt8135-spi: for mt8135 platforms
    - mediatek,mt6589-spi: for mt6589 platforms

- #address-cells: should be 1.

- #size-cells: should be 0.

- reg: Address and length of the register set for the device

- interrupts: Should contain spi interrupt

- clocks: phandles to input clocks.
  The first should be one of the following. It's PLL.
   -  <&clk26m>: specify parent clock 26MHZ.
   -  <&topckgen CLK_TOP_SYSPLL3_D2>: specify parent clock 109MHZ.
				      It's the default one.
   -  <&topckgen CLK_TOP_SYSPLL4_D2>: specify parent clock 78MHZ.
   -  <&topckgen CLK_TOP_UNIVPLL2_D4>: specify parent clock 104MHZ.
   -  <&topckgen CLK_TOP_UNIVPLL1_D8>: specify parent clock 78MHZ.
  The second should be <&topckgen CLK_TOP_SPI_SEL>. It's clock mux.
  The third is <&pericfg CLK_PERI_SPI0>. It's clock gate.

- clock-names: shall be "parent-clk" for the parent clock, "sel-clk" for the
  muxes clock, and "spi-clk" for the clock gate.

Optional properties:
- mediatek,pad-select: specify which pins group(ck/mi/mo/cs) spi
  controller used, this value should be 0~3, only required for MT8173.
    0: specify GPIO69,70,71,72 for spi pins.
    1: specify GPIO102,103,104,105 for spi pins.
    2: specify GPIO128,129,130,131 for spi pins.
    3: specify GPIO5,6,7,8 for spi pins.

Example:

- SoC Specific Portion:
spi: spi@1100a000 {
	compatible = "mediatek,mt8173-spi";
	#address-cells = <1>;
	#size-cells = <0>;
	reg = <0 0x1100a000 0 0x1000>;
	interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_LOW>;
	clocks = <&topckgen CLK_TOP_SYSPLL3_D2>,
		 <&topckgen CLK_TOP_SPI_SEL>,
		 <&pericfg CLK_PERI_SPI0>;
	clock-names = "parent-clk", "sel-clk", "spi-clk";

	mediatek,pad-select = <0>;
	status = "disabled";
};
<commit_msg>spi: mediatek: Update document devicetree bindings to support multiple devices<commit_after>Binding for MTK SPI controller

Required properties:
- compatible: should be one of the following.
    - mediatek,mt8173-spi: for mt8173 platforms
    - mediatek,mt8135-spi: for mt8135 platforms
    - mediatek,mt6589-spi: for mt6589 platforms

- #address-cells: should be 1.

- #size-cells: should be 0.

- reg: Address and length of the register set for the device

- interrupts: Should contain spi interrupt

- clocks: phandles to input clocks.
  The first should be one of the following. It's PLL.
   -  <&clk26m>: specify parent clock 26MHZ.
   -  <&topckgen CLK_TOP_SYSPLL3_D2>: specify parent clock 109MHZ.
				      It's the default one.
   -  <&topckgen CLK_TOP_SYSPLL4_D2>: specify parent clock 78MHZ.
   -  <&topckgen CLK_TOP_UNIVPLL2_D4>: specify parent clock 104MHZ.
   -  <&topckgen CLK_TOP_UNIVPLL1_D8>: specify parent clock 78MHZ.
  The second should be <&topckgen CLK_TOP_SPI_SEL>. It's clock mux.
  The third is <&pericfg CLK_PERI_SPI0>. It's clock gate.

- clock-names: shall be "parent-clk" for the parent clock, "sel-clk" for the
  muxes clock, and "spi-clk" for the clock gate.

Optional properties:
-cs-gpios: see spi-bus.txt, only required for MT8173.

- mediatek,pad-select: specify which pins group(ck/mi/mo/cs) spi
  controller used. This is a array, the element value should be 0~3,
  only required for MT8173.
    0: specify GPIO69,70,71,72 for spi pins.
    1: specify GPIO102,103,104,105 for spi pins.
    2: specify GPIO128,129,130,131 for spi pins.
    3: specify GPIO5,6,7,8 for spi pins.

Example:

- SoC Specific Portion:
spi: spi@1100a000 {
	compatible = "mediatek,mt8173-spi";
	#address-cells = <1>;
	#size-cells = <0>;
	reg = <0 0x1100a000 0 0x1000>;
	interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_LOW>;
	clocks = <&topckgen CLK_TOP_SYSPLL3_D2>,
		 <&topckgen CLK_TOP_SPI_SEL>,
		 <&pericfg CLK_PERI_SPI0>;
	clock-names = "parent-clk", "sel-clk", "spi-clk";
	cs-gpios = <&pio 105 GPIO_ACTIVE_LOW>, <&pio 72 GPIO_ACTIVE_LOW>;
	mediatek,pad-select = <1>, <0>;
	status = "disabled";
};

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