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doc: lpspi: Document DT bindings for LPSPI clocks

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Add introductions of clocks and clock-names strings.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Clark Wang 2019-03-06 06:30:36 +00:00 committed by Mark Brown
parent f5e5afdb0e
commit addb32866d
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1 changed files with 8 additions and 2 deletions
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10
Documentation/devicetree/bindings/spi/spi-fsl-lpspi.txt
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@ -7,7 +7,11 @@ Required properties:
- reg : address and length of the lpspi master registers
- interrupt-parent : core interrupt controller
- interrupts : lpspi interrupt
- clocks : lpspi clock specifier
- clocks : lpspi clock specifier. Its number and order need to correspond to the
value in clock-names.
- clock-names : Corresponding to per clock and ipg clock in "clocks"
respectively. In i.MX7ULP, it only has per clk, so use CLK_DUMMY
to fill the "ipg" blank.
- spi-slave : spi slave mode support. In slave mode, add this attribute without
value. In master mode, remove it.
@ -18,6 +22,8 @@ lpspi2: lpspi@40290000 {
reg = <0x40290000 0x10000>;
interrupt-parent = <&intc>;
interrupts = <GIC_SPI 28 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX7ULP_CLK_LPSPI2>;
clocks = <&clks IMX7ULP_CLK_LPSPI2>,
<&clks IMX7ULP_CLK_DUMMY>;
clock-names = "per", "ipg";
spi-slave;
};