mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-29 18:19:02 +00:00
41 lines
1.5 KiB
Diff
41 lines
1.5 KiB
Diff
|
From 3826d26d2a41f03c82c45465ff4759891c1688c6 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
||
|
|
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 <phil@raspberrypi.org>
|
||
|
|
---
|
||
|
|
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";
|
||
|
|
};
|
||
|
|
};
|
||
|
|
-
|