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