[PATCH v2 2/3] dt-bindings: iio: adc: ad7192: Fix clock config

[Alisa-Dariana Roman]

There are actually 4 configuration modes of clock source for AD719X
devices. Either a crystal can be attached externally between MCLK1 and
MCLK2 pins, or an external CMOS-compatible clock can drive the MCLK2
pin. The other 2 modes make use of the 4.92MHz internal clock, which can
be made available on the MCLK2 pin.

The presence of an external clock is optional, not required.

Fixes: f7356e47032c ("dt-bindings: iio: adc: ad7192: Add binding documentation for AD7192")
Signed-off-by: Alisa-Dariana Roman <alisa.roman@xxxxxxxxxx>
---
 .../bindings/iio/adc/adi,ad7192.yaml          | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
index a03da9489ed9..c5a4219a9388 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
@@ -39,11 +39,16 @@ properties:
 
   clocks:
     maxItems: 1
-    description: phandle to the master clock (mclk)
+    description: |
+      Optionally, either a crystal can be attached externally between MCLK1 and
+      MCLK2 pins, or an external CMOS-compatible clock can drive the MCLK2
+      pin. If absent, internal 4.92MHz clock is used which can be made available
+      on MCLK2.
 
   clock-names:
-    items:
-      - const: mclk
+    enum:
+      - xtal
+      - clk
 
   interrupts:
     maxItems: 1
@@ -135,8 +140,6 @@ patternProperties:
 required:
   - compatible
   - reg
-  - clocks
-  - clock-names
   - interrupts
   - dvdd-supply
   - avdd-supply
@@ -172,8 +175,8 @@ examples:
             spi-max-frequency = <1000000>;
             spi-cpol;
             spi-cpha;
-            clocks = <&ad7192_mclk>;
-            clock-names = "mclk";
+            clocks = <&ad7192_clk>;
+            clock-names = "clk";
             interrupts = <25 0x2>;
             interrupt-parent = <&gpio>;
             aincom-supply = <&aincom>;
@@ -202,8 +205,6 @@ examples:
             spi-max-frequency = <1000000>;
             spi-cpol;
             spi-cpha;
-            clocks = <&ad7192_mclk>;
-            clock-names = "mclk";
             interrupts = <25 0x2>;
             interrupt-parent = <&gpio>;
             aincom-supply = <&aincom>;
-- 
2.34.1