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>

diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
index 9b5c4f8..18c0f95 100644 (file)
--- 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 {