diff options
| author | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2016-02-15 15:57:49 +0300 |
|---|---|---|
| committer | Simon Horman <horms+renesas@verge.net.au> | 2016-02-25 07:12:32 +0300 |
| commit | 880cb5702471c4eb56b1af1c26e5273e48f50a32 (patch) | |
| tree | c226f7d3938cc83010f7ea9d1016b125bc15eaf3 /arch/arm/boot/dts/r8a7790-lager.dts | |
| parent | 89aac8af1a607355710c7c954efec85a9302bc95 (diff) | |
| download | linux-880cb5702471c4eb56b1af1c26e5273e48f50a32.tar.xz | |
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>
Diffstat (limited to 'arch/arm/boot/dts/r8a7790-lager.dts')
| -rw-r--r-- | arch/arm/boot/dts/r8a7790-lager.dts | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/arch/arm/boot/dts/r8a7790-lager.dts b/arch/arm/boot/dts/r8a7790-lager.dts index cdc0414f5f07..aa6ca92a9485 100644 --- a/arch/arm/boot/dts/r8a7790-lager.dts +++ b/arch/arm/boot/dts/r8a7790-lager.dts @@ -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 { |