dt-binding: spi: Document Macronix controller bindings

Document the bindings used by the Macronix controller.

Signed-off-by: Mason Yang <masonccyang@mxic.com.tw>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Mason Yang 2018-10-17 10:08:12 +08:00 committed by Mark Brown
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Macronix SPI controller Device Tree Bindings
--------------------------------------------
Required properties:
- compatible: should be "mxicy,mx25f0a-spi"
- #address-cells: should be 1
- #size-cells: should be 0
- reg: should contain 2 entries, one for the registers and one for the direct
mapping area
- reg-names: should contain "regs" and "dirmap"
- interrupts: interrupt line connected to the SPI controller
- clock-names: should contain "ps_clk", "send_clk" and "send_dly_clk"
- clocks: should contain 3 entries for the "ps_clk", "send_clk" and
"send_dly_clk" clocks
Example:
spi@43c30000 {
compatible = "mxicy,mx25f0a-spi";
reg = <0x43c30000 0x10000>, <0xa0000000 0x20000000>;
reg-names = "regs", "dirmap";
clocks = <&clkwizard 0>, <&clkwizard 1>, <&clkc 18>;
clock-names = "send_clk", "send_dly_clk", "ps_clk";
#address-cells = <1>;
#size-cells = <0>;
flash@0 {
compatible = "jedec,spi-nor";
reg = <0>;
spi-max-frequency = <25000000>;
spi-tx-bus-width = <4>;
spi-rx-bus-width = <4>;
};
};