linux-kernel - [PATCH v6 1/3] dt-bindings:iio:adc: add generic settling-time-us and oversampling-ratio channel properties

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Message-Id: <20210428073208.19570-2-o.rempel@pengutronix.de>
Date:   Wed, 28 Apr 2021 09:32:06 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Rob Herring <robh+dt@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        David Jander <david@...tonic.nl>,
        Robin van der Gracht <robin@...tonic.nl>,
        linux-iio@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: [PATCH v6 1/3] dt-bindings:iio:adc: add generic settling-time-us and oversampling-ratio channel properties

Settling time and over sampling is a typical challenge for different IIO ADC
devices. So, introduce channel specific settling-time-us and oversampling-ratio
properties to cover this use case.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 Documentation/devicetree/bindings/iio/adc/adc.yaml | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adc.yaml b/Documentation/devicetree/bindings/iio/adc/adc.yaml
index 912a7635edc4..db348fcbb52c 100644
--- a/Documentation/devicetree/bindings/iio/adc/adc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adc.yaml
@@ -39,4 +39,16 @@ properties:
       The first value specifies the positive input pin, the second
       specifies the negative input pin.
 
+  settling-time-us:
+    description:
+      Time between enabling the channel and first stable readings.
+
+  oversampling-ratio:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Oversampling is used as replacement of or addition to the low-pass filter.
+      In some cases, the desired filtering characteristics are a function the
+      device design and can interact with other characteristics such as
+      settling time.
+
 additionalProperties: true
-- 
2.29.2