58 lines
1.5 KiB
Plaintext
58 lines
1.5 KiB
Plaintext
|
* Microchip Analog to Digital Converter (ADC)
|
||
|
|
|
||
|
|
The node for this driver must be a child node of a SPI controller, hence
|
||
|
|
all mandatory properties described in
|
||
|
|
|
||
|
|
Documentation/devicetree/bindings/spi/spi-bus.txt
|
||
|
|
|
||
|
|
must be specified.
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
- compatible: Must be one of the following, depending on the
|
||
|
|
model:
|
||
|
|
"mcp3001" (DEPRECATED)
|
||
|
|
"mcp3002" (DEPRECATED)
|
||
|
|
"mcp3004" (DEPRECATED)
|
||
|
|
"mcp3008" (DEPRECATED)
|
||
|
|
"mcp3201" (DEPRECATED)
|
||
|
|
"mcp3202" (DEPRECATED)
|
||
|
|
"mcp3204" (DEPRECATED)
|
||
|
|
"mcp3208" (DEPRECATED)
|
||
|
|
"mcp3301" (DEPRECATED)
|
||
|
|
|
||
|
|
"microchip,mcp3001"
|
||
|
|
"microchip,mcp3002"
|
||
|
|
"microchip,mcp3004"
|
||
|
|
"microchip,mcp3008"
|
||
|
|
"microchip,mcp3201"
|
||
|
|
"microchip,mcp3202"
|
||
|
|
"microchip,mcp3204"
|
||
|
|
"microchip,mcp3208"
|
||
|
|
"microchip,mcp3301"
|
||
|
|
"microchip,mcp3550-50"
|
||
|
|
"microchip,mcp3550-60"
|
||
|
|
"microchip,mcp3551"
|
||
|
|
"microchip,mcp3553"
|
||
|
|
|
||
|
|
NOTE: The use of the compatibles with no vendor prefix
|
||
|
|
is deprecated and only listed because old DT use them.
|
||
|
|
|
||
|
|
- spi-cpha, spi-cpol (boolean):
|
||
|
|
Either SPI mode (0,0) or (1,1) must be used, so specify
|
||
|
|
none or both of spi-cpha, spi-cpol. The MCP3550/1/3
|
||
|
|
is more efficient in mode (1,1) as only 3 instead of
|
||
|
|
4 bytes need to be read from the ADC, but not all SPI
|
||
|
|
masters support it.
|
||
|
|
|
||
|
|
- vref-supply: Phandle to the external reference voltage supply.
|
||
|
|
|
||
|
|
Examples:
|
||
|
|
spi_controller {
|
||
|
|
mcp3x0x@0 {
|
||
|
|
compatible = "microchip,mcp3002";
|
||
|
|
reg = <0>;
|
||
|
|
spi-max-frequency = <1000000>;
|
||
|
|
vref-supply = <&vref_reg>;
|
||
|
|
};
|
||
|
|
};
|