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ARM: dts: bcm283x: Fix console path on RPi3

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Contrary to other RPi devices, RPi3 uses uart0 to communicate with
the BCM43438 bluetooth controller. uart1 is then used for the console.
Today, the console configuration is inherited from the bcm283x dtsi
(bootargs) which is not the correct one for the RPi3. This leads to
routing issue and confuses the Bluetooth controller with unexpected
data.

This patch introduces chosen/stdout path to configure console to uart0
on bcm283x family and overwrite it to uart1 in the RPi3 dts.

Create serial0/1 aliases referring to uart0 and uart1 paths.
Remove unneeded earlyprintk.

Fixes: 4188ea2aeb ("ARM: bcm283x: Define UART pinmuxing on board level")
Signed-off-by: Loic Poulain <loic.poulain@gmail.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Loic Poulain 2017-10-06 15:52:52 +02:00 committed by Eric Anholt
parent 2bd6bf03f4
commit f08f58a2bf
3 changed files with 14 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/arm/boot/dts/bcm2835-rpi-zero-w.dts
View File

@ -18,12 +18,9 @@
compatible = "raspberrypi,model-zero-w", "brcm,bcm2835";
model = "Raspberry Pi Zero W";
/* Needed by firmware to properly init UARTs */
aliases {
uart0 = "/soc/serial@7e201000";
uart1 = "/soc/serial@7e215040";
serial0 = "/soc/serial@7e201000";
serial1 = "/soc/serial@7e215040";
chosen {
/* 8250 auxiliary UART instead of pl011 */
stdout-path = "serial1:115200n8";
};
leds {

5
arch/arm/boot/dts/bcm2837-rpi-3-b.dts
View File

@ -8,6 +8,11 @@
compatible = "raspberrypi,3-model-b", "brcm,bcm2837";
model = "Raspberry Pi 3 Model B";
chosen {
/* 8250 auxiliary UART instead of pl011 */
stdout-path = "serial1:115200n8";
};
memory {
reg = <0 0x40000000>;
};

7
arch/arm/boot/dts/bcm283x.dtsi
View File

@ -20,8 +20,13 @@
#address-cells = <1>;
#size-cells = <1>;
aliases {
serial0 = &uart0;
serial1 = &uart1;
};
chosen {
bootargs = "earlyprintk console=ttyAMA0";
stdout-path = "serial0:115200n8";
};
thermal-zones {