These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / iio / adc / vf610-adc.txt

diff --git a/kernel/Documentation/devicetree/bindings/iio/adc/vf610-adc.txt b/kernel/Documentation/devicetree/bindings/iio/adc/vf610-adc.txt
index 1a4a43d..1aad051 100644 (file)
--- a/kernel/Documentation/devicetree/bindings/iio/adc/vf610-adc.txt
+++ b/kernel/Documentation/devicetree/bindings/iio/adc/vf610-adc.txt
@@ -11,6 +11,18 @@ Required properties:
 - clock-names: Must contain "adc", matching entry in the clocks property.
 - vref-supply: The regulator supply ADC reference voltage.
 
+Recommended properties:
+- fsl,adck-max-frequency: Maximum frequencies according to datasheets operating
+  requirements. Three values are required, depending on conversion mode:
+  - Frequency in normal mode (ADLPC=0, ADHSC=0)
+  - Frequency in high-speed mode (ADLPC=0, ADHSC=1)
+  - Frequency in low-power mode (ADLPC=1, ADHSC=0)
+- min-sample-time: Minimum sampling time in nanoseconds. This value has
+  to be chosen according to the conversion mode and the connected analog
+  source resistance (R_as) and capacitance (C_as). Refer the datasheet's
+  operating requirements. A safe default across a wide range of R_as and
+  C_as as well as conversion modes is 1000ns.
+
 Example:
 adc0: adc@4003b000 {
        compatible = "fsl,vf610-adc";
@@ -18,5 +30,7 @@ adc0: adc@4003b000 {
        interrupts = <0 53 0x04>;
        clocks = <&clks VF610_CLK_ADC0>;
        clock-names = "adc";
+       fsl,adck-max-frequency = <30000000>, <40000000>,
+                               <20000000>;
        vref-supply = <&reg_vcc_3v3_mcu>;
 };