mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-22 15:02:32 +00:00
cd2114e19c
As usual these patches were extracted from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> SVN-Revision: 48966
135 lines
4.0 KiB
Diff
135 lines
4.0 KiB
Diff
From 310f5af54ca26b68795f0376c67b41e2bb18a0e0 Mon Sep 17 00:00:00 2001
|
|
From: Dave Stevenson <6by9@users.noreply.github.com>
|
|
Date: Mon, 8 Feb 2016 23:49:41 +0000
|
|
Subject: [PATCH 169/170] DT: Add overlays to configure I2C pins
|
|
|
|
Lifted from
|
|
https://www.raspberrypi.org/forums/viewtopic.php?f=107&t=120938&p=825883
|
|
so not claiming this to be my own work.
|
|
Adds overlays i2c0-bcm2708 and i2c1-bcm2708 that allow the pin
|
|
allocations for i2c-0 and i2c-1 to be changed.
|
|
---
|
|
arch/arm/boot/dts/overlays/Makefile | 2 ++
|
|
arch/arm/boot/dts/overlays/README | 16 ++++++++++
|
|
.../arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts | 36 +++++++++++++++++++++
|
|
.../arm/boot/dts/overlays/i2c1-bcm2708-overlay.dts | 37 ++++++++++++++++++++++
|
|
4 files changed, 91 insertions(+)
|
|
create mode 100644 arch/arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts
|
|
create mode 100644 arch/arm/boot/dts/overlays/i2c1-bcm2708-overlay.dts
|
|
|
|
--- a/arch/arm/boot/dts/overlays/Makefile
|
|
+++ b/arch/arm/boot/dts/overlays/Makefile
|
|
@@ -29,6 +29,8 @@ dtb-$(RPI_DT_OVERLAYS) += hy28a-overlay.
|
|
dtb-$(RPI_DT_OVERLAYS) += hy28b-overlay.dtb
|
|
dtb-$(RPI_DT_OVERLAYS) += i2c-rtc-overlay.dtb
|
|
dtb-$(RPI_DT_OVERLAYS) += i2c-gpio-overlay.dtb
|
|
+dtb-$(RPI_DT_OVERLAYS) += i2c0-bcm2708-overlay.dtb
|
|
+dtb-$(RPI_DT_OVERLAYS) += i2c1-bcm2708-overlay.dtb
|
|
dtb-$(RPI_DT_OVERLAYS) += i2s-mmap-overlay.dtb
|
|
dtb-$(RPI_DT_OVERLAYS) += iqaudio-dac-overlay.dtb
|
|
dtb-$(RPI_DT_OVERLAYS) += iqaudio-dacplus-overlay.dtb
|
|
--- a/arch/arm/boot/dts/overlays/README
|
|
+++ b/arch/arm/boot/dts/overlays/README
|
|
@@ -371,6 +371,22 @@ Params: ds1307 Select t
|
|
pcf8563 Select the PCF8563 device
|
|
|
|
|
|
+Name: i2c0-bcm2708
|
|
+Info: Enable the i2c_bcm2708 driver for the i2c0 bus
|
|
+Load: dtoverlay=i2c0-bcm2708,<param>=<val>
|
|
+Params: sda0_pin GPIO pin for SDA0 (0, 28 [or 44] - default 0)
|
|
+ scl0_pin GPIO pin for SCL0 (1, 29 [or 45] - default 1)
|
|
+
|
|
+
|
|
+Name: i2c1-bcm2708
|
|
+Info: Enable the i2c_bcm2708 driver for the i2c1 bus
|
|
+Load: dtoverlay=i2c1-bcm2708,<param>=<val>
|
|
+Params: sda1_pin GPIO pin for SDA1 (2 or 44 - default 2)
|
|
+ scl1_pin GPIO pin for SCL1 (3 or 45 - default 3)
|
|
+ pin_func Alternative pin function (4 (alt0), 6 (alt2) -
|
|
+ default 4)
|
|
+
|
|
+
|
|
Name: i2s-mmap
|
|
Info: Enables mmap support in the bcm2708-i2s driver
|
|
Load: dtoverlay=i2s-mmap
|
|
--- /dev/null
|
|
+++ b/arch/arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts
|
|
@@ -0,0 +1,36 @@
|
|
+/*
|
|
+ * Device tree overlay for i2c_bcm2708, i2c0 bus
|
|
+ *
|
|
+ * Compile:
|
|
+ * dtc -@ -I dts -O dtb -o i2c0-bcm2708-overlay.dtb i2c0-bcm2708-overlay.dts
|
|
+ */
|
|
+
|
|
+/dts-v1/;
|
|
+/plugin/;
|
|
+
|
|
+/{
|
|
+ compatible = "brcm,bcm2708";
|
|
+
|
|
+ fragment@0 {
|
|
+ target = <&i2c0>;
|
|
+ __overlay__ {
|
|
+ pinctrl-0 = <&i2c0_pins>;
|
|
+ status = "okay";
|
|
+ };
|
|
+ };
|
|
+
|
|
+ fragment@1 {
|
|
+ target = <&gpio>;
|
|
+ __overlay__ {
|
|
+ i2c0_pins: i2c0 {
|
|
+ brcm,pins = <0 1>;
|
|
+ brcm,function = <4>; /* alt0 */
|
|
+ };
|
|
+ };
|
|
+ };
|
|
+
|
|
+ __overrides__ {
|
|
+ sda0_pin = <&i2c0_pins>,"brcm,pins:0";
|
|
+ scl0_pin = <&i2c0_pins>,"brcm,pins:4";
|
|
+ };
|
|
+};
|
|
--- /dev/null
|
|
+++ b/arch/arm/boot/dts/overlays/i2c1-bcm2708-overlay.dts
|
|
@@ -0,0 +1,37 @@
|
|
+/*
|
|
+ * Device tree overlay for i2c_bcm2708, i2c1 bus
|
|
+ *
|
|
+ * Compile:
|
|
+ * dtc -@ -I dts -O dtb -o i2c1-bcm2708-overlay.dtb i2c1-bcm2708-overlay.dts
|
|
+ */
|
|
+
|
|
+/dts-v1/;
|
|
+/plugin/;
|
|
+
|
|
+/{
|
|
+ compatible = "brcm,bcm2708";
|
|
+
|
|
+ fragment@0 {
|
|
+ target = <&i2c1>;
|
|
+ __overlay__ {
|
|
+ pinctrl-0 = <&i2c1_pins>;
|
|
+ status = "okay";
|
|
+ };
|
|
+ };
|
|
+
|
|
+ fragment@1 {
|
|
+ target = <&gpio>;
|
|
+ __overlay__ {
|
|
+ i2c1_pins: i2c1 {
|
|
+ brcm,pins = <2 3>;
|
|
+ brcm,function = <4>; /* alt0 */
|
|
+ };
|
|
+ };
|
|
+ };
|
|
+
|
|
+ __overrides__ {
|
|
+ sda1_pin = <&i2c1_pins>,"brcm,pins:0";
|
|
+ scl1_pin = <&i2c1_pins>,"brcm,pins:4";
|
|
+ pin_func = <&i2c1_pins>,"brcm,function:0";
|
|
+ };
|
|
+};
|