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authorWolfram Sang <wsa+renesas@sang-engineering.com>2018-02-06 23:29:55 +0100
committerSimon Horman <horms+renesas@verge.net.au>2018-02-12 13:50:59 +0100
commit61866d7fdc7007acfca2107f7d9fcb05ed0c6203 (patch)
tree5e10c704d2c7805b31c051c21444b29fc062fddd /arch
parent12937bffd64f5b9970589d0b946305d14cc45e6a (diff)
ARM: dts: alt: use demuxer for I2C1
Create a separate bus for HDMI related I2C1 and provide fallback to GPIO. Based on work for the r8a7790/lager by Wolfram Sang. Signed-off-by: Simon Horman <horms+renesas@verge.net.au> [wsa: rebased, fixed aliases, switched to named GPIOs] Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/boot/dts/r8a7794-alt.dts53
1 files changed, 37 insertions, 16 deletions
diff --git a/arch/arm/boot/dts/r8a7794-alt.dts b/arch/arm/boot/dts/r8a7794-alt.dts
index 60c6515c4996..26a883484ea8 100644
--- a/arch/arm/boot/dts/r8a7794-alt.dts
+++ b/arch/arm/boot/dts/r8a7794-alt.dts
@@ -18,7 +18,9 @@
aliases {
serial0 = &scif2;
+ i2c9 = &gpioi2c1;
i2c10 = &gpioi2c4;
+ i2c11 = &i2chdmi;
i2c12 = &i2cexio4;
};
@@ -138,17 +140,50 @@
clock-frequency = <148500000>;
};
+ gpioi2c1: i2c-9 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "i2c-gpio";
+ status = "disabled";
+ scl-gpios = <&gpio4 0 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+ sda-gpios = <&gpio4 1 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+ };
+
gpioi2c4: i2c-10 {
#address-cells = <1>;
#size-cells = <0>;
compatible = "i2c-gpio";
status = "disabled";
- sda-gpios = <&gpio4 9 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
scl-gpios = <&gpio4 8 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+ sda-gpios = <&gpio4 9 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
i2c-gpio,delay-us = <5>;
};
/*
+ * A fallback to GPIO is provided for I2C1.
+ */
+ i2chdmi: i2c-11 {
+ compatible = "i2c-demux-pinctrl";
+ i2c-parent = <&i2c1>, <&gpioi2c1>;
+ i2c-bus-name = "i2c-hdmi";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ composite-in@20 {
+ compatible = "adi,adv7180";
+ reg = <0x20>;
+ remote = <&vin0>;
+
+ port {
+ adv7180: endpoint {
+ bus-width = <8>;
+ remote-endpoint = <&vin0ep>;
+ };
+ };
+ };
+ };
+
+ /*
* I2C4 is routed to EXIO connector B, pins 73 (SCL) + 74 (SDA).
* A fallback to GPIO is provided.
*/
@@ -324,23 +359,9 @@
&i2c1 {
pinctrl-0 = <&i2c1_pins>;
- pinctrl-names = "default";
+ pinctrl-names = "i2c-hdmi";
- status = "okay";
clock-frequency = <400000>;
-
- composite-in@20 {
- compatible = "adi,adv7180";
- reg = <0x20>;
- remote = <&vin0>;
-
- port {
- adv7180: endpoint {
- bus-width = <8>;
- remote-endpoint = <&vin0ep>;
- };
- };
- };
};
&i2c4 {