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From 188bd7c0085ac5b3d966aa899c6be644907157ea Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 12 Aug 2019 15:48:39 +0100
Subject: [PATCH] ARM: dts: bcm2711-rpi-4-b: I2C aliases and pulls
The I2C interface nodes need aliases to give them fixed bus numbers,
and setting the pulls on the GPIOs (particularly 9-13) increases the
chances of the bus working with weak or absent external pulls.
See: https://www.raspberrypi.org/forums/posting.php?mode=reply&f=107&t=248439
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
+++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
@@ -23,6 +23,10 @@
mmc0 = &emmc2;
mmc1 = &mmcnr;
mmc2 = &sdhost;
+ i2c3 = &i2c3;
+ i2c4 = &i2c4;
+ i2c5 = &i2c5;
+ i2c6 = &i2c6;
/delete-property/ ethernet;
/delete-property/ intc;
ethernet0 = &genet;
@@ -207,31 +211,37 @@
i2c0_pins: i2c0 {
brcm,pins = <0 1>;
brcm,function = <BCM2835_FSEL_ALT0>;
+ brcm,pull = <BCM2835_PUD_UP>;
};
i2c1_pins: i2c1 {
brcm,pins = <2 3>;
brcm,function = <BCM2835_FSEL_ALT0>;
+ brcm,pull = <BCM2835_PUD_UP>;
};
i2c3_pins: i2c3 {
brcm,pins = <4 5>;
brcm,function = <BCM2835_FSEL_ALT5>;
+ brcm,pull = <BCM2835_PUD_UP>;
};
i2c4_pins: i2c4 {
brcm,pins = <8 9>;
brcm,function = <BCM2835_FSEL_ALT5>;
+ brcm,pull = <BCM2835_PUD_UP>;
};
i2c5_pins: i2c5 {
brcm,pins = <12 13>;
brcm,function = <BCM2835_FSEL_ALT5>;
+ brcm,pull = <BCM2835_PUD_UP>;
};
i2c6_pins: i2c6 {
brcm,pins = <22 23>;
brcm,function = <BCM2835_FSEL_ALT5>;
+ brcm,pull = <BCM2835_PUD_UP>;
};
i2s_pins: i2s {
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