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41 lines
1.5 KiB
41 lines
1.5 KiB
6 years ago
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From 3826d26d2a41f03c82c45465ff4759891c1688c6 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Mon, 19 Feb 2018 17:29:15 +0000
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Subject: [PATCH 222/454] overlays: i2c-gpio: Support for multiple instances
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Add a 'bus' parameter that, if set to a unique, non-zero
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value, allows multiple i2c-gpio instances to coexist. The chosen
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value doesn't determine the /dev/i2c-* value, but starting with
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1 or 2 and counting upwards seems sensible. N.B. The bus parameter
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has a default value of zero, so one instance doesn't need to specify
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a value.
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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arch/arm/boot/dts/overlays/README | 3 +++
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arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts | 2 +-
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2 files changed, 4 insertions(+), 1 deletion(-)
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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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@@ -693,6 +693,9 @@ Params: i2c_gpio_sda GPIO use
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i2c_gpio_delay_us Clock delay in microseconds
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(default "2" = ~100kHz)
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+ bus Set to a unique, non-zero value if wanting
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+ multiple i2c-gpio busses (default "0")
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+
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Name: i2c-mux
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Info: Adds support for a number of I2C bus multiplexers on i2c_arm
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--- a/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
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@@ -38,6 +38,6 @@
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i2c_gpio_sda = <&i2c_gpio>,"gpios:4";
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i2c_gpio_scl = <&i2c_gpio>,"gpios:16";
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i2c_gpio_delay_us = <&i2c_gpio>,"i2c-gpio,delay-us:0";
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+ bus = <&i2c_gpio>, "reg:0";
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};
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};
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-
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