From 0d850e7cdc69962e85abd7f7dcd2359f293f835a Mon Sep 17 00:00:00 2001 From: Leilk Liu Date: Fri, 7 Aug 2015 15:19:49 +0800 Subject: [PATCH] spi: Mediatek: Document devicetree bindings for spi bus Signed-off-by: Leilk Liu Signed-off-by: Mark Brown --- .../devicetree/bindings/spi/spi-mt65xx.txt | 51 +++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 Documentation/devicetree/bindings/spi/spi-mt65xx.txt diff --git a/Documentation/devicetree/bindings/spi/spi-mt65xx.txt b/Documentation/devicetree/bindings/spi/spi-mt65xx.txt new file mode 100644 index 000000000000..dcefc438272f --- /dev/null +++ b/Documentation/devicetree/bindings/spi/spi-mt65xx.txt @@ -0,0 +1,51 @@ +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 <&topckgen CLK_TOP_SPI_SEL>. + The second should be one of the following. + - <&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. + +- clock-names: shall be "spi-clk" for the controller clock, and + "parent-clk" for the parent clock. + +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 = ; + clocks = <&topckgen CLK_TOP_SPI_SEL>, <&topckgen CLK_TOP_SYSPLL3_D2>; + clock-names = "spi-clk", "parent-clk"; + mediatek,pad-select = <0>; + status = "disabled"; +}; -- 2.20.1