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Message-Id: <20180411141555.15044-2-peda@axentia.se>
Date: Wed, 11 Apr 2018 16:15:54 +0200
From: Peter Rosin <peda@...ntia.se>
To: linux-kernel@...r.kernel.org
Cc: Peter Rosin <peda@...ntia.se>, Jonathan Cameron <jic23@...nel.org>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
"David S. Miller" <davem@...emloft.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Randy Dunlap <rdunlap@...radead.org>,
"Andrew F . Davis" <afd@...com>,
Fabio Estevam <festevam@...il.com>, linux-iio@...r.kernel.org,
devicetree@...r.kernel.org
Subject: [PATCH 1/2] dt-bindings: iio: afe: add binding for adi,lt6106
This is a current sense amplifier from Analog Devices.
Signed-off-by: Peter Rosin <peda@...ntia.se>
---
.../devicetree/bindings/iio/afe/adi,lt6106.txt | 50 ++++++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 51 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/afe/adi,lt6106.txt
diff --git a/Documentation/devicetree/bindings/iio/afe/adi,lt6106.txt b/Documentation/devicetree/bindings/iio/afe/adi,lt6106.txt
new file mode 100644
index 000000000000..98b6d93596f2
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/afe/adi,lt6106.txt
@@ -0,0 +1,50 @@
+LT6106 36V High Side Current Sence Amplifier
+============================================
+
+This binding assumes the typical application of the current sense amplifier
+as described in the LT6106 datasheet.
+
+http://www.analog.com/media/en/technical-documentation/data-sheets/6106fb.pdf
+
+ .------.
+ Vin --------------------+--------------+-|Rsense|-+-----.
+ | | '------' | |
+ | | | .---.
+ .--------------------. .---. | | L |
+ | V+ | |Rin| | | O |
+ | | '---' | | A |
+ | | | | | D |
+ | -IN |----' | '---'
+ Vout ---+----| OUT LT6106 | | |
+ | | +IN |---------------' GND
+ .----. | |
+ |Rout| | |
+ '----' | V- |
+ | '--------------------'
+ | |
+ GND GND
+
+The voltage Vsense over Rsense is measured by looking at Vout. They
+are related as Vout = Vsense * Rout / Rin. The current Isense through
+Rsense is (almost) the same as that through the LOAD. Hence, the
+interesting LOAD current can be calculated as
+
+ Vout * Rin / (Rout * Rsense)
+
+Required properties:
+- compatible : "adi,lt6106"
+- io-channels : Channel node of an io-channel measuring Vout.
+- sense-resistor-micro-ohms : The Rsense resistance in microohms.
+- input-resistor-ohms : The Rin resistance in ohms.
+- output-resistor-ohms : The Rout resistance in ohms.
+
+Example:
+
+sysi {
+ compatible = "adi,lt6106";
+ io-channels = <&tiadc 0>;
+
+ sense-resistor-micro-ohms = <20000>;
+ input-resistor-ohms = <200>;
+ output-resistor-ohms = <10000>;
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 21368749f3b0..76d1e03f350a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6893,6 +6893,7 @@ IIO UNIT CONVERTER
M: Peter Rosin <peda@...ntia.se>
L: linux-iio@...r.kernel.org
S: Maintained
+F: Documentation/devicetree/bindings/iio/afe/adi,lt6106.txt
F: Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt
F: Documentation/devicetree/bindings/iio/afe/voltage-divider.txt
F: drivers/iio/afe/iio-unit-converter.c
--
2.11.0
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