1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
From e239ab77f367aff3bcb1d2ed807c438cf0f2ffe8 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Fri, 6 May 2016 12:53:16 +0100
Subject: [PATCH 319/423] BCM270X_DT: i2c0-bcm2708 - pin group params
Add parameters to set pin groups as a unit, setting the pin function
appropriately. The parameters are:
pins_0_1
pins_28_29
pins_44_45
pins_46_47
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
arch/arm/boot/dts/overlays/README | 11 ++++--
.../arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts | 43 +++++++++++++++++-----
2 files changed, 42 insertions(+), 12 deletions(-)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -449,10 +449,15 @@ Params: ds1307 Select t
Name: i2c0-bcm2708
-Info: Enable the i2c_bcm2708 driver for the i2c0 bus
+Info: Enable the i2c_bcm2708 driver for the i2c0 bus. Not all pin combinations
+ are usable on all platforms.
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)
+Params: sda0_pin GPIO pin for SDA0 (deprecated - use pins_*)
+ scl0_pin GPIO pin for SCL0 (deprecated - use pins_*)
+ pins_0_1 Use pins 0 and 1 (default)
+ pins_28_29 Use pins 28 and 29
+ pins_44_45 Use pins 44 and 45
+ pins_46_47 Use pins 46 and 47
Name: i2c1-bcm2708
--- a/arch/arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts
+++ b/arch/arm/boot/dts/overlays/i2c0-bcm2708-overlay.dts
@@ -14,23 +14,48 @@
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 */
- };
+ target = <&i2c0_pins>;
+ frag1: __overlay__ {
+ brcm,pins = <0 1>;
+ brcm,function = <4>; /* alt0 */
+ };
+ };
+
+ fragment@2 {
+ target = <&i2c0_pins>;
+ __dormant__ {
+ brcm,pins = <28 29>;
+ brcm,function = <4>; /* alt0 */
+ };
+ };
+
+ fragment@3 {
+ target = <&i2c0_pins>;
+ __dormant__ {
+ brcm,pins = <44 45>;
+ brcm,function = <5>; /* alt1 */
+ };
+ };
+
+ fragment@4 {
+ target = <&i2c0_pins>;
+ __dormant__ {
+ brcm,pins = <46 47>;
+ brcm,function = <4>; /* alt0 */
};
};
__overrides__ {
- sda0_pin = <&i2c0_pins>,"brcm,pins:0";
- scl0_pin = <&i2c0_pins>,"brcm,pins:4";
+ sda0_pin = <&frag1>,"brcm,pins:0";
+ scl0_pin = <&frag1>,"brcm,pins:4";
+ pins_0_1 = <0>,"+1-2-3-4";
+ pins_28_29 = <0>,"-1+2-3-4";
+ pins_44_45 = <0>,"-1-2+3-4";
+ pins_46_47 = <0>,"-1-2-3+4";
};
};
|
