linux-kernel - [PATCH v4 1/8] dt-bindings: iio: adc: ad7606: Remove spi-cpha from required

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Message-Id: <20241009-ad7606_add_iio_backend_support-v4-1-6971a8c0f1d5@baylibre.com>
Date: Wed, 09 Oct 2024 09:19:32 +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>
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, jstephan@...libre.com, 
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
 Guillaume Stols <gstols@...libre.com>
Subject: [PATCH v4 1/8] dt-bindings: iio: adc: ad7606: Remove spi-cpha from
 required

The documentation is erroneously stating that spi-cpha is required, and
the example is erroneously setting both spi-cpol and spi-cpha. According
to the datasheet, only cpol should be set.

On zedboard for instance, setting the devicetree as in the example will
simply not work.

Fixes: 416f882c3b40 ("dt-bindings: iio: adc: Migrate AD7606 documentation to yaml")
Fixes: 6e33a125df66 ("dt-bindings: iio: adc: Add docs for AD7606 ADC")
Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
Signed-off-by: Guillaume Stols <gstols@...libre.com>
---
 Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
index bec7cfba52a7..47081c79a1cf 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
@@ -39,6 +39,11 @@ properties:
   "#size-cells":
     const: 0

+  # 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.  Subsequently, in case SPI
+  # interface is used, the correct way is to only set spi-cpol.
   spi-cpha: true

   spi-cpol: true
@@ -168,7 +173,6 @@ patternProperties:
 required:
   - compatible
   - reg
-  - spi-cpha
   - avcc-supply
   - vdrive-supply
   - interrupts
@@ -255,7 +259,6 @@ examples:
             reg = <0>;
             spi-max-frequency = <1000000>;
             spi-cpol;
-            spi-cpha;

             avcc-supply = <&adc_vref>;
             vdrive-supply = <&vdd_supply>;
@@ -288,7 +291,6 @@ examples:

             spi-max-frequency = <1000000>;
             spi-cpol;
-            spi-cpha;

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

-- 
2.34.1