linux-kernel - [PATCH v2 01/10] dt-bindings: iio: adc: ad7606: Set the correct polarity

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Message-Id: <20240920-ad7606_add_iio_backend_support-v2-1-0e78782ae7d0@baylibre.com>
Date: Fri, 20 Sep 2024 17:33:21 +0000
From: Guillaume Stols <gstols@...libre.com>
To: Uwe Kleine-König <ukleinek@...nel.org>, 
 Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Jonathan Corbet <corbet@....net>, 
 Michal Marek <mmarek@...e.com>
Cc: linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Michael Hennerich <michael.hennerich@...log.com>, 
 linux-fbdev@...r.kernel.org, linux-iio@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-doc@...r.kernel.org, 
 aardelean@...libre.com, dlechner@...libre.com, 
 Guillaume Stols <gstols@...libre.com>, jstephan@...libre.com
Subject: [PATCH v2 01/10] dt-bindings: iio: adc: ad7606: Set the correct
 polarity

According to the datasheet, "Data is clocked in from SDI on the falling
edge of SCLK, while data is clocked out on DOUTA on the rising edge of
SCLK".
Also, even if not stated textually in the datasheet, it is made clear on
the diagrams that sclk idles at high.

So the documentation is erroneously stating that spi-cpha is required, and
the example is erroneously setting both spi-cpol and spi-cpha.

Fixes: 416f882c3b40 ("dt-bindings: iio: adc: Migrate AD7606 documentation to yaml")
Fixes: 6e33a125df66 ("dt-bindings: iio: adc: Add docs for AD7606 ADC")

Signed-off-by: Guillaume Stols <gstols@...libre.com>
---
 Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
index 69408cae3db9..75334a033539 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
@@ -29,8 +29,6 @@ properties:
   reg:
     maxItems: 1

-  spi-cpha: true
-
   spi-cpol: true

   avcc-supply: true
@@ -117,7 +115,7 @@ properties:
 required:
   - compatible
   - reg
-  - spi-cpha
+  - spi-cpol
   - avcc-supply
   - vdrive-supply
   - interrupts
@@ -185,7 +183,6 @@ examples:
             reg = <0>;
             spi-max-frequency = <1000000>;
             spi-cpol;
-            spi-cpha;

             avcc-supply = <&adc_vref>;
             vdrive-supply = <&vdd_supply>;

-- 
2.34.1