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Commit 1f8e5415 authored Aug 12, 2019 by Phil Elwell

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>

parent 067fe10f

arch/arm/boot/dts/bcm2711-rpi-4-b.dts

+10 −0

Original line number	Diff line number	Diff line
		@@ -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 {