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98 lines
2.8 KiB
Diff
98 lines
2.8 KiB
Diff
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From 27f0e0e195568c06f21ce380f0736bdd219baf3c Mon Sep 17 00:00:00 2001
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From: Janis Streib <janis+github@dogcraft.de>
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Date: Sun, 15 Oct 2023 21:08:40 +0200
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Subject: [PATCH] overlays: mcp23017: allow specification of the i2c bus
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Analogous to i2c-rtc-overlay.dts
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See: https://github.com/raspberrypi/linux/pull/5650
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---
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arch/arm/boot/dts/overlays/README | 10 ++++++
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.../boot/dts/overlays/mcp23017-overlay.dts | 36 +++++++++++++++++--
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2 files changed, 44 insertions(+), 2 deletions(-)
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -2810,6 +2810,16 @@ Params: gpiopin Gpio pin
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mcp23008 Configure an MCP23008 instead.
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noints Disable the interrupt GPIO line.
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+ i2c0 Choose the I2C0 bus on GPIOs 0&1
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+ i2c_csi_dsi Choose the I2C0 bus on GPIOs 44&45
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+ i2c3 Choose the I2C3 bus (configure with the i2c3
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+ overlay - BCM2711 only)
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+ i2c4 Choose the I2C4 bus (configure with the i2c4
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+ overlay - BCM2711 only)
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+ i2c5 Choose the I2C5 bus (configure with the i2c5
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+ overlay - BCM2711 only)
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+ i2c6 Choose the I2C6 bus (configure with the i2c6
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+ overlay - BCM2711 only)
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Name: mcp23s17
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--- a/arch/arm/boot/dts/overlays/mcp23017-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/mcp23017-overlay.dts
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@@ -7,7 +7,7 @@
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compatible = "brcm,bcm2835";
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fragment@0 {
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- target = <&i2c1>;
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+ target = <&i2cbus>;
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__overlay__ {
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status = "okay";
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};
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@@ -24,7 +24,7 @@
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};
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fragment@2 {
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- target = <&i2c1>;
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+ target = <&i2cbus>;
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__overlay__ {
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#address-cells = <1>;
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#size-cells = <0>;
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@@ -58,12 +58,44 @@
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};
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};
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+ frag100: fragment@100 {
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+ target = <&i2c1>;
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+ i2cbus: __overlay__ {
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@101 {
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+ target = <&i2c0if>;
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+ __dormant__ {
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@102 {
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+ target = <&i2c0mux>;
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+ __dormant__ {
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+ status = "okay";
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+ };
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+ };
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+
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__overrides__ {
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gpiopin = <&mcp23017_pins>,"brcm,pins:0",
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<&mcp23017_irq>,"interrupts:0";
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addr = <&mcp23017>,"reg:0", <&mcp23017_pins>,"reg:0";
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mcp23008 = <0>,"=3";
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noints = <0>,"!1!4";
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+ i2c0 = <&frag100>, "target:0=",<&i2c0>;
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+ i2c_csi_dsi = <&frag100>, "target:0=",<&i2c_csi_dsi>,
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+ <0>,"+101+102";
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+ i2c3 = <&frag100>, "target?=0",
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+ <&frag100>, "target-path=i2c3";
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+ i2c4 = <&frag100>, "target?=0",
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+ <&frag100>, "target-path=i2c4";
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+ i2c5 = <&frag100>, "target?=0",
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+ <&frag100>, "target-path=i2c5";
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+ i2c6 = <&frag100>, "target?=0",
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+ <&frag100>, "target-path=i2c6";
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};
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};
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