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[185.246.87.17]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-430d59b1207sm13892765e9.31.2024.10.09.02.19.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Oct 2024 02:19:42 -0700 (PDT) From: Guillaume Stols Date: Wed, 09 Oct 2024 09:19:32 +0000 Subject: [PATCH v4 1/8] dt-bindings: iio: adc: ad7606: Remove spi-cpha from required Precedence: bulk X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241009-ad7606_add_iio_backend_support-v4-1-6971a8c0f1d5@baylibre.com> References: <20241009-ad7606_add_iio_backend_support-v4-0-6971a8c0f1d5@baylibre.com> In-Reply-To: <20241009-ad7606_add_iio_backend_support-v4-0-6971a8c0f1d5@baylibre.com> To: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Greg Kroah-Hartman , "Rafael J. Wysocki" , Jonathan Corbet Cc: linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org, Michael Hennerich , linux-fbdev@vger.kernel.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org, aardelean@baylibre.com, dlechner@baylibre.com, jstephan@baylibre.com, Jonathan Cameron , Guillaume Stols X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1728465581; l=2087; i=gstols@baylibre.com; s=20240417; h=from:subject:message-id; bh=i5ddTg9UYKxycz6OdhvhiiZOyT6VwY+Z1+h88aZcdf0=; b=hZz/mRsl6+YEI2LEnuZTydZWDHLywT+t6zZIl3mZJRYm4Nlr+PT1obtugBuoKOJZI5Nh/R8PN bNbeUWoN1WICT0cuTktqkFSsg//KPUKZ3rXfd9PI4AJE65MGJMxV2BU X-Developer-Key: i=gstols@baylibre.com; a=ed25519; pk=XvMm5WHuV67sGYOJZqIYzXndbaJOlNd8Q6li6vnb4Cs= 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) Signed-off-by: Guillaume Stols --- 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>;