From: Wolfram Sang <wsa+rene...@sang-engineering.com>
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+rene...@sang-engineering.com>
---
arch/arm/boot/dts/r8a7790-lager.dts | 32 ++++++++++++++++++++++++++++++--
1 file changed, 30 insertions(+), 2 deletions(-)
diff --git a/arch/arm/boot/dts/r8a7790-lager.dts
b/arch/arm/boot/dts/r8a7790-lager.dts
index 08eef61ffad1af..a776aa37daa00e 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 {
@@ -364,6 +383,11 @@
renesas,function = "msiof1";
};
+ i2c0_pins: i2c0 {
+ renesas,groups = "i2c0";
+ renesas,function = "i2c0";
+ };
+
iic0_pins: iic0 {
renesas,groups = "iic0";
renesas,function = "iic0";
@@ -555,10 +579,14 @@
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 {
--
2.1.4
