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135 lines
4.0 KiB
Diff
135 lines
4.0 KiB
Diff
From 67c13f9569f35903cd8e02307223f31701e3bece Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <6by9@users.noreply.github.com>
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Date: Mon, 8 Feb 2016 23:49:41 +0000
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Subject: [PATCH] DT: Add overlays to configure I2C pins
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Lifted from
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https://www.raspberrypi.org/forums/viewtopic.php?f=107&t=120938&p=825883
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so not claiming this to be my own work.
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Adds overlays i2c0-bcm2708 and i2c1-bcm2708 that allow the pin
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allocations for i2c-0 and i2c-1 to be changed.
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---
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arch/arm/boot/dts/overlays/Makefile | 2 ++
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arch/arm/boot/dts/overlays/README | 16 ++++++++++
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.../arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts | 36 +++++++++++++++++++++
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.../arm/boot/dts/overlays/i2c1-bcm2708-overlay.dts | 37 ++++++++++++++++++++++
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4 files changed, 91 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts
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create mode 100644 arch/arm/boot/dts/overlays/i2c1-bcm2708-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -29,6 +29,8 @@ dtb-$(RPI_DT_OVERLAYS) += hy28a-overlay.
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dtb-$(RPI_DT_OVERLAYS) += hy28b-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += i2c-rtc-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += i2c-gpio-overlay.dtb
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+dtb-$(RPI_DT_OVERLAYS) += i2c0-bcm2708-overlay.dtb
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+dtb-$(RPI_DT_OVERLAYS) += i2c1-bcm2708-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += i2s-mmap-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += iqaudio-dac-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += iqaudio-dacplus-overlay.dtb
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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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@@ -371,6 +371,22 @@ Params: ds1307 Select t
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pcf8563 Select the PCF8563 device
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+Name: i2c0-bcm2708
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+Info: Enable the i2c_bcm2708 driver for the i2c0 bus
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+Load: dtoverlay=i2c0-bcm2708,<param>=<val>
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+Params: sda0_pin GPIO pin for SDA0 (0, 28 [or 44] - default 0)
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+ scl0_pin GPIO pin for SCL0 (1, 29 [or 45] - default 1)
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+
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+
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+Name: i2c1-bcm2708
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+Info: Enable the i2c_bcm2708 driver for the i2c1 bus
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+Load: dtoverlay=i2c1-bcm2708,<param>=<val>
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+Params: sda1_pin GPIO pin for SDA1 (2 or 44 - default 2)
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+ scl1_pin GPIO pin for SCL1 (3 or 45 - default 3)
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+ pin_func Alternative pin function (4 (alt0), 6 (alt2) -
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+ default 4)
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+
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+
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Name: i2s-mmap
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Info: Enables mmap support in the bcm2708-i2s driver
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Load: dtoverlay=i2s-mmap
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts
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@@ -0,0 +1,36 @@
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+/*
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+ * Device tree overlay for i2c_bcm2708, i2c0 bus
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+ *
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+ * Compile:
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+ * dtc -@ -I dts -O dtb -o i2c0-bcm2708-overlay.dtb i2c0-bcm2708-overlay.dts
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+ */
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+
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+/dts-v1/;
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+/plugin/;
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+
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+/{
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+ compatible = "brcm,bcm2708";
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+
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+ fragment@0 {
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+ target = <&i2c0>;
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+ __overlay__ {
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+ pinctrl-0 = <&i2c0_pins>;
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ i2c0_pins: i2c0 {
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+ brcm,pins = <0 1>;
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+ brcm,function = <4>; /* alt0 */
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+ };
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+ };
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+ };
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+
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+ __overrides__ {
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+ sda0_pin = <&i2c0_pins>,"brcm,pins:0";
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+ scl0_pin = <&i2c0_pins>,"brcm,pins:4";
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+ };
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+};
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/i2c1-bcm2708-overlay.dts
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@@ -0,0 +1,37 @@
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+/*
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+ * Device tree overlay for i2c_bcm2708, i2c1 bus
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+ *
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+ * Compile:
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+ * dtc -@ -I dts -O dtb -o i2c1-bcm2708-overlay.dtb i2c1-bcm2708-overlay.dts
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+ */
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+
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+/dts-v1/;
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+/plugin/;
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+
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+/{
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+ compatible = "brcm,bcm2708";
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+
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+ fragment@0 {
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+ target = <&i2c1>;
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+ __overlay__ {
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+ pinctrl-0 = <&i2c1_pins>;
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ i2c1_pins: i2c1 {
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+ brcm,pins = <2 3>;
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+ brcm,function = <4>; /* alt0 */
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+ };
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+ };
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+ };
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+
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+ __overrides__ {
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+ sda1_pin = <&i2c1_pins>,"brcm,pins:0";
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+ scl1_pin = <&i2c1_pins>,"brcm,pins:4";
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+ pin_func = <&i2c1_pins>,"brcm,function:0";
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+ };
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+};
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