From: Simon Horman <horms+renesas@xxxxxxxxxxxx>
Make it possible to fallback to GPIO for I2C1 on the EXIO-C connector.
This is based on reference work for the I2C0 core of the lager/r8a7790
by Wolfram Sang.
Signed-off-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
[wsa: rebased and fixed aliases]
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm/boot/dts/r8a7791-koelsch.dts | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/arch/arm/boot/dts/r8a7791-koelsch.dts b/arch/arm/boot/dts/r8a7791-koelsch.dts
index 57e69af6513619..5405d337d74486 100644
--- a/arch/arm/boot/dts/r8a7791-koelsch.dts
+++ b/arch/arm/boot/dts/r8a7791-koelsch.dts
@@ -50,6 +50,8 @@
aliases {
serial0 = &scif0;
serial1 = &scif1;
+ i2c9 = &gpioi2c1;
+ i2c12 = &i2cexio1;
};
chosen {
@@ -298,6 +300,29 @@
#clock-cells = <0>;
clock-frequency = <148500000>;
};
+
+ gpioi2c1: i2c-9 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "i2c-gpio";
+ status = "disabled";
+ gpios = <&gpio7 16 GPIO_ACTIVE_HIGH /* sda */
+ &gpio7 15 GPIO_ACTIVE_HIGH /* scl */
+ >;
+ i2c-gpio,delay-us = <5>;
+ };
+
+ /*
+ * I2C1 is routed to EXIO connector B, pins 64 (SCL) + 66 (SDA).
+ * A fallback to GPIO is provided.
+ */
+ i2cexio1: i2c-12 {
+ compatible = "i2c-demux-pinctrl";
+ i2c-parent = <&i2c1>, <&gpioi2c1>;
+ i2c-bus-name = "i2c-exio1";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ };
};
&du {
@@ -333,6 +358,11 @@
pinctrl-0 = <&scif_clk_pins>;
pinctrl-names = "default";
+ i2c1_pins: i2c1 {
+ groups = "i2c1";
+ function = "i2c1";
+ };
+
i2c2_pins: i2c2 {
groups = "i2c2";
function = "i2c2";
@@ -582,6 +612,11 @@
};
};
+&i2c1 {
+ pinctrl-0 = <&i2c1_pins>;
+ pinctrl-names = "i2c-exio1";
+};
+
&i2c2 {
pinctrl-0 = <&i2c2_pins>;
pinctrl-names = "default";
--
2.9.3
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