Make it possible to select which I2C1 IP core you want to run on the
EXIO-A connector.
This is based on reference work for the I2C0 core of the lager board
by Wolfram Sang.
Cc: Wolfram Sang <wsa+rene...@sang-engineering.com>
Signed-off-by: Simon Horman <horms+rene...@verge.net.au>
---
v3
* Add GPIO fallback
* Re-order buses to facilitate grouping of additional GPIO buses
v2
* No change
---
arch/arm/boot/dts/r8a7790-lager.dts | 39 +++++++++++++++++++++++++++++++++++--
1 file changed, 37 insertions(+), 2 deletions(-)
diff --git a/arch/arm/boot/dts/r8a7790-lager.dts
b/arch/arm/boot/dts/r8a7790-lager.dts
index 6b25d9e7d21b..05302d0d7e33 100644
--- a/arch/arm/boot/dts/r8a7790-lager.dts
+++ b/arch/arm/boot/dts/r8a7790-lager.dts
@@ -50,7 +50,9 @@
aliases {
serial0 = &scif0;
serial1 = &scifa1;
+ i2c8 = "gpioi2c1";
i2c10 = "i2cexio0";
+ i2c11 = "i2cexio1";
};
chosen {
@@ -254,6 +256,17 @@
clock-frequency = <148500000>;
};
+ gpioi2c1: i2c-8 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "i2c-gpio";
+ status = "disabled";
+ gpios = <&gpio1 17 GPIO_ACTIVE_HIGH /* sda */
+ &gpio1 16 GPIO_ACTIVE_HIGH /* scl */
+ >;
+ i2c-gpio,delay-us = <5>;
+ };
+
/*
* 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
@@ -272,6 +285,19 @@
#address-cells = <1>;
#size-cells = <0>;
};
+
+ /*
+ * IIC1/I2C1 is routed to EXIO connector A, pins 78 (SCL) + 80 (SDA).
+ * This is similar to the arangement described for i2cexio0 (above)
+ * with a fallback to GPIO also provided.
+ */
+ i2cexio1: i2c-11 {
+ compatible = "i2c-demux-pinctrl";
+ i2c-parent = <&iic1>, <&i2c1>, <&gpioi2c1>;
+ i2c-bus-name = "i2c-exio1";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ };
};
&du {
@@ -394,6 +420,11 @@
function = "iic0";
};
+ i2c1_pins: i2c1 {
+ groups = "i2c1";
+ function = "i2c1";
+ };
+
iic1_pins: iic1 {
groups = "iic1";
function = "iic1";
@@ -590,10 +621,14 @@
pinctrl-names = "i2c-exio0";
};
+&i2c1 {
+ pinctrl-0 = <&i2c1_pins>;
+ pinctrl-names = "i2c-exio1";
+};
+
&iic1 {
- status = "okay";
pinctrl-0 = <&iic1_pins>;
- pinctrl-names = "default";
+ pinctrl-names = "i2c-exio1";
};
&iic2 {
--
2.1.4
