A new compatible is added to reflect the specialized version of the HDL. We use the parallel interface to write the ADC's registers, and accessing this interface requires to use ADI_AXI_REG_CONFIG_RD,ADI_AXI_REG_CONFIG_WR and ADI_AXI_REG_CONFIG_CTRL in a custom fashion. Signed-off-by: Guillaume Stols <gstols@xxxxxxxxxxxx> --- .../devicetree/bindings/iio/adc/adi,axi-adc.yaml | 53 ++++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/Documentation/devicetree/bindings/iio/adc/adi,axi-adc.yaml b/Documentation/devicetree/bindings/iio/adc/adi,axi-adc.yaml index e1f450b80db2..6c3fc44422cc 100644 --- a/Documentation/devicetree/bindings/iio/adc/adi,axi-adc.yaml +++ b/Documentation/devicetree/bindings/iio/adc/adi,axi-adc.yaml @@ -17,13 +17,22 @@ description: | interface for the actual ADC, while this IP core will interface to the data-lines of the ADC and handle the streaming of data into memory via DMA. + In some cases, the AXI ADC interface is used to perform specialized + operation to a particular ADC, e.g access the physical bus through + specific registers to write ADC registers. + In this case, we use a different compatible whch indicates the target + chip(s)'s name. + The following IP is currently supported: + -axi_ad7606X: Backend for all the chips from the ad7606 family. https://wiki.analog.com/resources/fpga/docs/axi_adc_ip + http://analogdevicesinc.github.io/hdl/library/axi_ad7606x/index.html properties: compatible: enum: - adi,axi-adc-10.0.a + - adi,axi-ad7606x reg: maxItems: 1 @@ -53,6 +62,24 @@ required: - reg - clocks +allOf: + - if: + properties: + compatible: + contains: + const: adi,axi-ad7606x + then: + patternProperties: + "^adc@[0-9a-f]+$": + type: object + properties: + reg: + maxItems: 1 + additionalProperties: true + required: + - compatible + - reg + additionalProperties: false examples: @@ -65,4 +92,30 @@ examples: clocks = <&axi_clk>; #io-backend-cells = <0>; }; + - | + #include <dt-bindings/gpio/gpio.h> + axi-adc@44a00000 { + compatible = "adi,axi-ad7606x"; + reg = <0x44a00000 0x10000>; + dmas = <&rx_dma 0>; + dma-names = "rx"; + clocks = <&ext_clk>; + #address-cells = <1>; + #size-cells = <0>; + + adi_adc@0 { + compatible = "adi,ad7606b"; + reg = <0>; + pwms = <&axi_pwm_gen 0 0>; + pwm-names = "cnvst_n"; + avcc-supply = <&adc_vref>; + reset-gpios = <&gpio0 91 GPIO_ACTIVE_HIGH>; + standby-gpios = <&gpio0 90 GPIO_ACTIVE_LOW>; + adi,range-gpios = <&gpio0 89 GPIO_ACTIVE_HIGH>; + adi,oversampling-ratio-gpios = <&gpio0 88 GPIO_ACTIVE_HIGH + &gpio0 87 GPIO_ACTIVE_HIGH + &gpio0 86 GPIO_ACTIVE_HIGH>; + io-backends = <&iio_backend>; + }; + }; ... -- 2.34.1
