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