From 27f0e0e195568c06f21ce380f0736bdd219baf3c Mon Sep 17 00:00:00 2001
From: Janis Streib <janis+github@dogcraft.de>
Date: Sun, 15 Oct 2023 21:08:40 +0200
Subject: [PATCH] overlays: mcp23017: allow specification of the i2c bus
Analogous to i2c-rtc-overlay.dts
See: https://github.com/raspberrypi/linux/pull/5650
---
arch/arm/boot/dts/overlays/README | 10 ++++++
.../boot/dts/overlays/mcp23017-overlay.dts | 36 +++++++++++++++++--
2 files changed, 44 insertions(+), 2 deletions(-)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -2810,6 +2810,16 @@ Params: gpiopin Gpio pin
mcp23008 Configure an MCP23008 instead.
noints Disable the interrupt GPIO line.
+ 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 I2C4 bus (configure with the i2c4
+ overlay - BCM2711 only)
+ i2c5 Choose the I2C5 bus (configure with the i2c5
+ overlay - BCM2711 only)
+ i2c6 Choose the I2C6 bus (configure with the i2c6
+ overlay - BCM2711 only)
Name: mcp23s17
--- a/arch/arm/boot/dts/overlays/mcp23017-overlay.dts
+++ b/arch/arm/boot/dts/overlays/mcp23017-overlay.dts
@@ -7,7 +7,7 @@
compatible = "brcm,bcm2835";
fragment@0 {
- target = <&i2c1>;
+ target = <&i2cbus>;
__overlay__ {
status = "okay";
};
@@ -24,7 +24,7 @@
};
fragment@2 {
- target = <&i2c1>;
+ target = <&i2cbus>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
@@ -58,12 +58,44 @@
};
};
+ frag100: fragment@100 {
+ target = <&i2c1>;
+ i2cbus: __overlay__ {
+ status = "okay";
+ };
+ };
+
+ fragment@101 {
+ target = <&i2c0if>;
+ __dormant__ {
+ status = "okay";
+ };
+ };
+
+ fragment@102 {
+ target = <&i2c0mux>;
+ __dormant__ {
+ status = "okay";
+ };
+ };
+
__overrides__ {
gpiopin = <&mcp23017_pins>,"brcm,pins:0",
<&mcp23017_irq>,"interrupts:0";
addr = <&mcp23017>,"reg:0", <&mcp23017_pins>,"reg:0";
mcp23008 = <0>,"=3";
noints = <0>,"!1!4";
+ i2c0 = <&frag100>, "target:0=",<&i2c0>;
+ 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";
};
};