Create a separate bus for HDMI related I2C1 and provide fallback to GPIO.
Based on work for r8a7794/Alt by Wolfram Sang: "ARM: dts: alt: use demuxer
for I2C1"
Add Fixes: 97b94d256d432ba9 ("ARM: dts: iwg22d-sodimm-dbhd-ca: Add HDMI
video output")
Signed-off-by: Biju Das <biju.das@xxxxxxxxxxxxxx>
Reviewed-by: Chris Paterson <chris.paterson2@xxxxxxxxxxx>
---
We have observed that randomly HDMI slave device is holding data line after a soft reboot.
We applied this patch and using an oscilloscope verified that i2c recovery works on the
failure condition.
.../arm/boot/dts/r8a7745-iwg22d-sodimm-dbhd-ca.dts | 96 +++++++++++++---------
1 file changed, 59 insertions(+), 37 deletions(-)
diff --git a/arch/arm/boot/dts/r8a7745-iwg22d-sodimm-dbhd-ca.dts b/arch/arm/boot/dts/r8a7745-iwg22d-sodimm-dbhd-ca.dts
index d34de82..de120a3 100644
--- a/arch/arm/boot/dts/r8a7745-iwg22d-sodimm-dbhd-ca.dts
+++ b/arch/arm/boot/dts/r8a7745-iwg22d-sodimm-dbhd-ca.dts
@@ -19,6 +19,8 @@
serial0 = &scif1;
serial4 = &scif5;
serial6 = &hscif2;
+ i2c8 = &gpioi2c1;
+ i2c10 = &i2chdmi;
};
cec_clock: cec-clock {
@@ -27,6 +29,16 @@
clock-frequency = <12000000>;
};
+ gpioi2c1: i2c-8 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "i2c-gpio";
+ status = "disabled";
+ scl-gpios = <&gpio0 11 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+ sda-gpios = <&gpio0 12 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+ i2c-gpio,delay-us = <5>;
+ };
+
hdmi-out {
compatible = "hdmi-connector";
type = "a";
@@ -37,6 +49,52 @@
};
};
};
+
+ /*
+ * A fallback to GPIO is provided for I2C1.
+ */
+ i2chdmi: i2c-10 {
+ compatible = "i2c-demux-pinctrl";
+ i2c-parent = <&i2c1>, <&gpioi2c1>;
+ i2c-bus-name = "i2c-hdmi";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ hdmi@39 {
+ compatible = "adi,adv7511w";
+ reg = <0x39>;
+ interrupt-parent = <&gpio1>;
+ interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+ clocks = <&cec_clock>;
+ clock-names = "cec";
+ pd-gpios = <&gpio2 24 GPIO_ACTIVE_HIGH>;
+
+ adi,input-depth = <8>;
+ adi,input-colorspace = "rgb";
+ adi,input-clock = "1x";
+ adi,input-style = <1>;
+ adi,input-justification = "evenly";
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port@0 {
+ reg = <0>;
+ adv7511_in: endpoint {
+ remote-endpoint = <&du_out_rgb0>;
+ };
+ };
+
+ port@1 {
+ reg = <1>;
+ adv7511_out: endpoint {
+ remote-endpoint = <&hdmi_con>;
+ };
+ };
+ };
+ };
+ };
};
&du {
@@ -70,45 +128,9 @@
&i2c1 {
pinctrl-0 = <&i2c1_pins>;
- pinctrl-names = "default";
+ pinctrl-names = "i2c-hdmi";
- status = "okay";
clock-frequency = <400000>;
-
- hdmi@39 {
- compatible = "adi,adv7511w";
- reg = <0x39>;
- interrupt-parent = <&gpio1>;
- interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
- clocks = <&cec_clock>;
- clock-names = "cec";
- pd-gpios = <&gpio2 24 GPIO_ACTIVE_HIGH>;
-
- adi,input-depth = <8>;
- adi,input-colorspace = "rgb";
- adi,input-clock = "1x";
- adi,input-style = <1>;
- adi,input-justification = "evenly";
-
- ports {
- #address-cells = <1>;
- #size-cells = <0>;
-
- port@0 {
- reg = <0>;
- adv7511_in: endpoint {
- remote-endpoint = <&du_out_rgb0>;
- };
- };
-
- port@1 {
- reg = <1>;
- adv7511_out: endpoint {
- remote-endpoint = <&hdmi_con>;
- };
- };
- };
- };
};
&pfc {
--
2.7.4
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