spi: Mediatek: Document devicetree bindings update for spi bus
authorLeilk Liu <leilk.liu@mediatek.com>
Mon, 31 Aug 2015 13:18:58 +0000 (21:18 +0800)
committerMark Brown <broonie@kernel.org>
Mon, 31 Aug 2015 14:26:50 +0000 (15:26 +0100)
This patch updates spi bindings, fixs clock usage description.

Signed-off-by: Leilk Liu <leilk.liu@mediatek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Documentation/devicetree/bindings/spi/spi-mt65xx.txt

index dcefc43..6160ffb 100644 (file)
@@ -15,17 +15,18 @@ Required properties:
 - 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.
+  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 "spi-clk" for the controller clock, and
-  "parent-clk" for the parent clock.
+- 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
@@ -44,8 +45,11 @@ spi: spi@1100a000 {
        #size-cells = <0>;
        reg = <0 0x1100a000 0 0x1000>;
        interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_LOW>;
-       clocks = <&topckgen CLK_TOP_SPI_SEL>, <&topckgen CLK_TOP_SYSPLL3_D2>;
-       clock-names = "spi-clk", "parent-clk";
+       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";
 };