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From 911dedf3f51adf8cfd6554af1c89c922c4453889 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Mon, 24 Apr 2023 16:27:57 +0100
Subject: [PATCH] dtoverlays: Add overrides for alternate i2c buses to
i2c-mux
The i2c-mux overlay was fixed to i2c-1. Add overrides to allow
it to be assigned to alternate buses.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
arch/arm/boot/dts/overlays/README | 16 ++++++++
.../arm/boot/dts/overlays/i2c-mux-overlay.dts | 40 +++++++++++++++++--
2 files changed, 53 insertions(+), 3 deletions(-)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -1833,6 +1833,22 @@ Params: pca9542 Select t
addr Change I2C address of the device (default 0x70)
+ i2c0 Choose the I2C0 bus on GPIOs 0&1
+
+ i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
+
+ i2c3 Choose the I2C3 bus (configure with the i2c3
+ overlay - BCM2711 only)
+
+ i2c4 Choose the I2C3 bus (configure with the i2c3
+ overlay - BCM2711 only)
+
+ i2c5 Choose the I2C5 bus (configure with the i2c4
+ overlay - BCM2711 only)
+
+ i2c6 Choose the I2C6 bus (configure with the i2c6
+ overlay - BCM2711 only)
+
[ The i2c-mux-pca9548a overlay has been deleted. See i2c-mux. ]
--- a/arch/arm/boot/dts/overlays/i2c-mux-overlay.dts
+++ b/arch/arm/boot/dts/overlays/i2c-mux-overlay.dts
@@ -7,7 +7,7 @@
compatible = "brcm,bcm2835";
fragment@0 {
- target = <&i2c_arm>;
+ target = <&i2cbus>;
__dormant__ {
#address-cells = <1>;
#size-cells = <0>;
@@ -34,7 +34,7 @@
};
fragment@1 {
- target = <&i2c_arm>;
+ target = <&i2cbus>;
__dormant__ {
#address-cells = <1>;
#size-cells = <0>;
@@ -71,7 +71,7 @@
};
fragment@2 {
- target = <&i2c_arm>;
+ target = <&i2cbus>;
__dormant__ {
#address-cells = <1>;
#size-cells = <0>;
@@ -127,6 +127,27 @@
};
};
+ frag100: fragment@100 {
+ target = <&i2c_arm>;
+ i2cbus: __overlay__ {
+ status = "okay";
+ };
+ };
+
+ fragment@101 {
+ target = <&i2c0if>;
+ __dormant__ {
+ status = "okay";
+ };
+ };
+
+ fragment@102 {
+ target = <&i2c0mux>;
+ __dormant__ {
+ status = "okay";
+ };
+ };
+
__overrides__ {
pca9542 = <0>, "+0";
pca9545 = <0>, "+1";
@@ -135,5 +156,18 @@
addr = <&pca9542>,"reg:0",
<&pca9545>,"reg:0",
<&pca9548>,"reg:0";
+
+ i2c0 = <&frag100>, "target:0=",<&i2c0>,
+ <0>,"+101+102";
+ i2c_csi_dsi = <&frag100>, "target:0=",<&i2c_csi_dsi>,
+ <0>,"+101+102";
+ i2c3 = <&frag100>, "target?=0",
+ <&frag100>, "target-path=i2c3";
+ i2c4 = <&frag100>, "target?=0",
+ <&frag100>, "target-path=i2c4";
+ i2c5 = <&frag100>, "target?=0",
+ <&frag100>, "target-path=i2c5";
+ i2c6 = <&frag100>, "target?=0",
+ <&frag100>, "target-path=i2c6";
};
};
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