target/linux/brcm2708/patches-4.19/950-0695-ARM-dts-bcm2711-rpi-4-b-I2C-aliases-and-pulls.patch

   1 From 188bd7c0085ac5b3d966aa899c6be644907157ea Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Mon, 12 Aug 2019 15:48:39 +0100
   4 Subject: [PATCH] ARM: dts: bcm2711-rpi-4-b: I2C aliases and pulls
   5
   6 The I2C interface nodes need aliases to give them fixed bus numbers,
   7 and setting the pulls on the GPIOs (particularly 9-13) increases the
   8 chances of the bus working with weak or absent external pulls.
   9
  10 See: https://www.raspberrypi.org/forums/posting.php?mode=reply&f=107&t=248439
  11
  12 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  13 ---
  14  arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 10 ++++++++++
  15  1 file changed, 10 insertions(+)
  16
  17 --- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
  18 +++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
  19 @@ -23,6 +23,10 @@
  20                 mmc0 = &emmc2;
  21                 mmc1 = &mmcnr;
  22                 mmc2 = &sdhost;
  23 +               i2c3 = &i2c3;
  24 +               i2c4 = &i2c4;
  25 +               i2c5 = &i2c5;
  26 +               i2c6 = &i2c6;
  27                 /delete-property/ ethernet;
  28                 /delete-property/ intc;
  29                 ethernet0 = &genet;
  30 @@ -207,31 +211,37 @@
  31         i2c0_pins: i2c0 {
  32                 brcm,pins = <0 1>;
  33                 brcm,function = <BCM2835_FSEL_ALT0>;
  34 +               brcm,pull = <BCM2835_PUD_UP>;
  35         };
  36
  37         i2c1_pins: i2c1 {
  38                 brcm,pins = <2 3>;
  39                 brcm,function = <BCM2835_FSEL_ALT0>;
  40 +               brcm,pull = <BCM2835_PUD_UP>;
  41         };
  42
  43         i2c3_pins: i2c3 {
  44                 brcm,pins = <4 5>;
  45                 brcm,function = <BCM2835_FSEL_ALT5>;
  46 +               brcm,pull = <BCM2835_PUD_UP>;
  47         };
  48
  49         i2c4_pins: i2c4 {
  50                 brcm,pins = <8 9>;
  51                 brcm,function = <BCM2835_FSEL_ALT5>;
  52 +               brcm,pull = <BCM2835_PUD_UP>;
  53         };
  54
  55         i2c5_pins: i2c5 {
  56                 brcm,pins = <12 13>;
  57                 brcm,function = <BCM2835_FSEL_ALT5>;
  58 +               brcm,pull = <BCM2835_PUD_UP>;
  59         };
  60
  61         i2c6_pins: i2c6 {
  62                 brcm,pins = <22 23>;
  63                 brcm,function = <BCM2835_FSEL_ALT5>;
  64 +               brcm,pull = <BCM2835_PUD_UP>;
  65         };
  66
  67         i2s_pins: i2s {