From: Peter Rosin <peda@axentia.se>
To: <linux-kernel@vger.kernel.org>
Cc: Peter Rosin <peda@axentia.se>, Wolfram Sang <wsa@the-dreams.de>,
"Rob Herring" <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
"Jonathan Cameron" <jic23@kernel.org>,
Hartmut Knaack <knaack.h@gmx.de>,
"Lars-Peter Clausen" <lars@metafoo.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
"Arnd Bergmann" <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
<linux-i2c@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-iio@vger.kernel.org>
Subject: [RFC PATCH v2 6/7] dt-bindings: i2c: i2c-mux-simple: document i2c-mux-simple bindings
Date: Thu, 17 Nov 2016 22:48:08 +0100 [thread overview]
Message-ID: <1479419289-17553-7-git-send-email-peda@axentia.se> (raw)
In-Reply-To: <1479419289-17553-1-git-send-email-peda@axentia.se>
---
.../devicetree/bindings/i2c/i2c-mux-simple.txt | 91 ++++++++++++++++++++++
1 file changed, 91 insertions(+)
create mode 100644 Documentation/devicetree/bindings/i2c/i2c-mux-simple.txt
diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-simple.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-simple.txt
new file mode 100644
index 000000000000..fec1ab39ad64
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-mux-simple.txt
@@ -0,0 +1,91 @@
+Simple I2C Bus Mux
+
+This binding describes an I2C bus multiplexer that uses GPIOs to
+route the I2C signals.
+
+ .-----. .-----.
+ | dev | | dev |
+ .------------. '-----' '-----'
+ | SoC | | |
+ | | .--------+--------'
+ | .------. | .------+ child bus A, on MUX value set to 0
+ | | I2C |-|--| Mux |
+ | '------' | '--+---+ child bus B, on MUX value set to 1
+ | .------. | | '----------+--------+--------.
+ | | MUX- | | | | | |
+ | | Ctrl |-|-----+ .-----. .-----. .-----.
+ | '------' | | dev | | dev | | dev |
+ '------------' '-----' '-----' '-----'
+
+Required properties:
+- compatible: i2c-mux-simple,mux-locked or i2c-mux-simple,parent-locked
+- i2c-parent: The phandle of the I2C bus that this multiplexer's master-side
+ port is connected to.
+- control-muxes : Node of the multiplexer that controls "Mux".
+- control-mux-names : Should be "mux".
+* Standard I2C mux properties. See i2c-mux.txt in this directory.
+* I2C child bus nodes. See i2c-mux.txt in this directory.
+
+Optional properties:
+- idle-state: value to set the muxer to when idle. When no value is
+ given, it defaults to the last value used.
+
+For each i2c child node, an I2C child bus will be created. They will
+be numbered based on their order in the device tree.
+
+Whenever an access is made to a device on a child bus, the value set
+in the relevant node's reg property will be fed to the mux controller.
+
+If an idle state is defined, using the idle-state (optional) property,
+whenever an access is not being made to a device on a child bus, the
+mux controller will be set according to the idle value.
+
+If an idle state is not defined, the most recently used value will be
+left programmed into hardware whenever no access is being made to a
+device on a child bus.
+
+Example:
+ control_i2c_mux: control-i2c-mux {
+ compatible = "mux-gpio";
+
+ mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,
+ <&pioA 1 GPIO_ACTIVE_HIGH>;
+ };
+
+ i2c-mux {
+ compatible = "i2c-mux-simple,mux-locked";
+ i2c-parent = <&i2c1>;
+
+ control-muxes = <&control_i2c_mux>;
+ control-mux-names = "mux";
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ i2c@1 {
+ reg = <1>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ ssd1307: oled@3c {
+ compatible = "solomon,ssd1307fb-i2c";
+ reg = <0x3c>;
+ pwms = <&pwm 4 3000>;
+ reset-gpios = <&gpio2 7 1>;
+ reset-active-low;
+ };
+ };
+
+ i2c@3 {
+ reg = <3>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ pca9555: pca9555@20 {
+ compatible = "nxp,pca9555";
+ gpio-controller;
+ #gpio-cells = <2>;
+ reg = <0x20>;
+ };
+ };
+ };
--
2.1.4
next prev parent reply other threads:[~2016-11-17 22:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-17 21:48 [RFC PATCH v2 0/7] mux controller abstraction and iio/i2c muxes Peter Rosin
2016-11-17 21:48 ` [RFC PATCH v2 1/7] dt-bindings: document devicetree bindings for mux-gpio Peter Rosin
2016-11-18 15:35 ` Rob Herring
2016-11-18 16:59 ` Peter Rosin
2016-11-19 15:21 ` Jonathan Cameron
2016-11-17 21:48 ` [RFC PATCH v2 2/7] misc: minimal mux subsystem and gpio-based mux controller Peter Rosin
2016-11-19 15:34 ` Jonathan Cameron
2016-11-21 13:03 ` Peter Rosin
2016-11-17 21:48 ` [RFC PATCH v2 3/7] iio: inkern: api for manipulating ext_info of iio channels Peter Rosin
2016-11-19 15:38 ` Jonathan Cameron
2016-11-21 15:45 ` Lars-Peter Clausen
2016-11-21 16:07 ` Peter Rosin
2016-11-17 21:48 ` [RFC PATCH v2 4/7] dt-bindings: iio: iio-mux: document iio-mux bindings Peter Rosin
2016-11-17 21:48 ` [RFC PATCH v2 5/7] iio: multiplexer: new iio category and iio-mux driver Peter Rosin
2016-11-19 15:49 ` Jonathan Cameron
2016-11-19 22:08 ` Peter Rosin
2016-11-27 11:42 ` Jonathan Cameron
2016-11-17 21:48 ` Peter Rosin [this message]
2016-11-17 21:48 ` [RFC PATCH v2 7/7] i2c: i2c-mux-simple: new driver Peter Rosin
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