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From:   <Eugen.Hristev@microchip.com>
To:     <wsa@the-dreams.de>, <peda@axentia.se>, <mark.rutland@arm.com>,
        <Ludovic.Desroches@microchip.com>, <linux-i2c@vger.kernel.org>,
        <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <pierre-yves.mordret@st.com>,
        <alexandre.belloni@bootlin.com>, <robh+dt@kernel.org>
CC:     <Nicolas.Ferre@microchip.com>, <Eugen.Hristev@microchip.com>
Subject: [PATCH v4 2/9] dt-bindings: i2c: add bindings for i2c analog and
 digital filter
Thread-Topic: [PATCH v4 2/9] dt-bindings: i2c: add bindings for i2c analog and
 digital filter
Thread-Index: AQHVYXbctVkeTzhRG0edAs7kSbS9Tg==
Date:   Mon, 2 Sep 2019 10:12:00 +0000
Message-ID: <1567418773-2427-3-git-send-email-eugen.hristev@microchip.com>
References: <1567418773-2427-1-git-send-email-eugen.hristev@microchip.com>
In-Reply-To: <1567418773-2427-1-git-send-email-eugen.hristev@microchip.com>
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From: Eugen Hristev <eugen.hristev@microchip.com>

Some i2c controllers have a built-in digital or analog filter.
This is specifically required depending on the hardware PCB/board.
Some controllers also allow specifying the maximum width of the
spikes that can be filtered. The width length can be specified in nanosecon=
ds.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
---
 Documentation/devicetree/bindings/i2c/i2c.txt | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/=
devicetree/bindings/i2c/i2c.txt
index 44efafd..8dbff67 100644
--- a/Documentation/devicetree/bindings/i2c/i2c.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c.txt
@@ -55,6 +55,17 @@ wants to support one of the below features, it should ad=
apt the bindings below.
 	Number of nanoseconds the SDA signal takes to fall; t(f) in the I2C
 	specification.
=20
+- i2c-analog-filter
+	Enable analog filter for i2c lines.
+
+- i2c-digital-filter
+	Enable digital filter for i2c lines.
+
+- i2c-filter-width-ns
+	Width of spikes which can be filtered by either digital or analog
+	filters (i2c-analog-filtr or i2c-digital-filtr). This width is specified
+	in nanoseconds.
+
 - interrupts
 	interrupts used by the device.
=20
--=20
2.7.4