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ARM: dts: r8a7790: lager: use demuxer for IIC0/I2C0 

Make it possible to select which I2C IP core you want to run on the
EXIO-A connector. This is the reference how to use this feature. Update
the copyright while we are here.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Wolfram Sang 2016-02-15 13:57:49 +01:00 committed by Simon Horman
parent 89aac8af1a
commit 880cb57024
1 changed files with 30 additions and 2 deletions
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32
arch/arm/boot/dts/r8a7790-lager.dts
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@ -3,6 +3,7 @@
*
* Copyright (C) 2013-2014 Renesas Solutions Corp.
* Copyright (C) 2014 Cogent Embedded, Inc.
* Copyright (C) 2015-2016 Renesas Electronics Corporation
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
@ -49,6 +50,7 @@
aliases {
serial0 = &scif0;
serial1 = &scifa1;
i2c8 = "i2cexio";
};
chosen {
@ -252,6 +254,23 @@
#clock-cells = <0>;
clock-frequency = <148500000>;
};
/*
* IIC0/I2C0 is routed to EXIO connector A, pins 114 (SCL) + 116 (SDA) only.
* We use the I2C demuxer, so the desired IP core can be selected at runtime
* depending on the use case (e.g. DMA with IIC0 or slave support with I2C0).
* Note: For testing the I2C slave feature, it is convenient to connect this
* bus with IIC3 on pins 110 (SCL) + 112 (SDA), select I2C0 at runtime, and
* instantiate the slave device at runtime according to the documentation.
* You can then communicate with the slave via IIC3.
*/
i2cexio: i2c@8 {
compatible = "i2c-demux-pinctrl";
i2c-parent = <&iic0>, <&i2c0>;
i2c-bus-name = "i2c-exio";
#address-cells = <1>;
#size-cells = <0>;
};
};
&du {
@ -350,6 +369,11 @@
renesas,function = "msiof1";
};
i2c0_pins: i2c0 {
renesas,groups = "i2c0";
renesas,function = "i2c0";
};
iic0_pins: iic0 {
renesas,groups = "iic0";
renesas,function = "iic0";
@ -537,10 +561,14 @@
cpu0-supply = <&vdd_dvfs>;
};
&i2c0 {
pinctrl-0 = <&i2c0_pins>;
pinctrl-names = "i2c-exio";
};
&iic0 {
status = "okay";
pinctrl-0 = <&iic0_pins>;
pinctrl-names = "default";
pinctrl-names = "i2c-exio";
};
&iic1 {