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100 lines
2.9 KiB
Diff
100 lines
2.9 KiB
Diff
From c3b4c2b0432a51abe5836dd8a90fd25c1e08f2ad Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Fri, 6 May 2016 12:53:16 +0100
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Subject: [PATCH] BCM270X_DT: i2c0-bcm2708 - pin group params
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Add parameters to set pin groups as a unit, setting the pin function
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appropriately. The parameters are:
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pins_0_1
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pins_28_29
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pins_44_45
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pins_46_47
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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 | 11 ++++--
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.../arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts | 43 +++++++++++++++++-----
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2 files changed, 42 insertions(+), 12 deletions(-)
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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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@@ -449,10 +449,15 @@ Params: ds1307 Select t
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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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+Info: Enable the i2c_bcm2708 driver for the i2c0 bus. Not all pin combinations
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+ are usable on all platforms.
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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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+Params: sda0_pin GPIO pin for SDA0 (deprecated - use pins_*)
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+ scl0_pin GPIO pin for SCL0 (deprecated - use pins_*)
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+ pins_0_1 Use pins 0 and 1 (default)
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+ pins_28_29 Use pins 28 and 29
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+ pins_44_45 Use pins 44 and 45
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+ pins_46_47 Use pins 46 and 47
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Name: i2c1-bcm2708
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--- a/arch/arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts
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@@ -14,23 +14,48 @@
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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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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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+ target = <&i2c0_pins>;
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+ frag1: __overlay__ {
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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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+ fragment@2 {
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+ target = <&i2c0_pins>;
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+ __dormant__ {
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+ brcm,pins = <28 29>;
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+ brcm,function = <4>; /* alt0 */
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+ };
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+ };
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+
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+ fragment@3 {
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+ target = <&i2c0_pins>;
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+ __dormant__ {
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+ brcm,pins = <44 45>;
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+ brcm,function = <5>; /* alt1 */
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+ };
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+ };
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+
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+ fragment@4 {
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+ target = <&i2c0_pins>;
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+ __dormant__ {
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+ brcm,pins = <46 47>;
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+ brcm,function = <4>; /* alt0 */
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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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+ sda0_pin = <&frag1>,"brcm,pins:0";
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+ scl0_pin = <&frag1>,"brcm,pins:4";
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+ pins_0_1 = <0>,"+1-2-3-4";
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+ pins_28_29 = <0>,"-1+2-3-4";
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+ pins_44_45 = <0>,"-1-2+3-4";
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+ pins_46_47 = <0>,"-1-2-3+4";
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};
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};
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