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Message-ID: <63cef5c3643d359e8ec13366ca79377f12dd73b1.1759398641.git.geert+renesas@glider.be>
Date: Thu, 2 Oct 2025 11:53:05 +0200
From: Geert Uytterhoeven <geert+renesas@...der.be>
To: Tony Lindgren <tony@...mide.com>,
Bruno Thomsen <bruno.thomsen@...il.com>,
Judith Mendez <jm@...com>,
Kevin Hilman <khilman@...libre.com>,
Arnd Bergmann <arnd@...db.de>,
Matti Vaittinen <mazziesaccount@...il.com>
Cc: linux-omap@...r.kernel.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] ARM: dts: am33xx: Add missing serial console speed
Without a serial console speed specified in chosen/stdout-path in the
DTB, the serial console uses the default speed of the serial driver,
unless explicitly overridden in a legacy console= kernel command-line
parameter.
After dropping "ti,omap3-uart" from the list of compatible values in DT,
AM33xx serial ports can no longer be used with the legacy OMAP serial
driver, but only with the OMAP-flavored 8250 serial driver (which is
mutually-exclusive with the former). However, replacing
CONFIG_SERIAL_OMAP=y by CONFIG_SERIAL_8250_OMAP=y (with/without enabling
CONFIG_SERIAL_8250_OMAP_TTYO_FIXUP) may not be sufficient to restore
serial console functionality: the legacy OMAP serial driver defaults to
115200 bps, while the 8250 serial driver defaults to 9600 bps, causing
no visible output on the serial console when no appropriate console=
kernel command-line parameter is specified.
Fix this for all AM33xx boards by adding ":115200n8" to
chosen/stdout-path. This requires replacing the "&uartN" reference by
the corresponding "serialN" DT alias.
Fixes: ca8be8fc2c306efb ("ARM: dts: am33xx-l4: fix UART compatible")
Fixes: 077e1cde78c3f904 ("ARM: omap2plus_defconfig: Enable 8250_OMAP")
Closes: https://lore.kernel.org/CAMuHMdUb7Jb2=GqK3=Rn+Gv5G9KogcQieqDvjDCkJA4zyX4VcA@mail.gmail.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Tested on BeagleBone Black.
I only updated DTS files affected by commit ca8be8fc2c306efb.
Probably more DTS files for other SoCs should be updated, too.
---
arch/arm/boot/dts/ti/omap/am335x-bone-common.dtsi | 2 +-
arch/arm/boot/dts/ti/omap/am335x-boneblue.dts | 2 +-
arch/arm/boot/dts/ti/omap/am335x-chiliboard.dts | 2 +-
arch/arm/boot/dts/ti/omap/am335x-evm.dts | 2 +-
arch/arm/boot/dts/ti/omap/am335x-evmsk.dts | 2 +-
arch/arm/boot/dts/ti/omap/am335x-guardian.dts | 2 +-
arch/arm/boot/dts/ti/omap/am335x-icev2.dts | 2 +-
arch/arm/boot/dts/ti/omap/am335x-myirtech-myd.dts | 2 +-
arch/arm/boot/dts/ti/omap/am335x-osd3358-sm-red.dts | 2 +-
arch/arm/boot/dts/ti/omap/am335x-pdu001.dts | 2 +-
arch/arm/boot/dts/ti/omap/am335x-pocketbeagle.dts | 2 +-
arch/arm/boot/dts/ti/omap/am335x-sl50.dts | 2 +-
12 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/arch/arm/boot/dts/ti/omap/am335x-bone-common.dtsi b/arch/arm/boot/dts/ti/omap/am335x-bone-common.dtsi
index ad1e60a9b6fde8f9..b75dabfa56ae7605 100644
--- a/arch/arm/boot/dts/ti/omap/am335x-bone-common.dtsi
+++ b/arch/arm/boot/dts/ti/omap/am335x-bone-common.dtsi
@@ -16,7 +16,7 @@ memory@...00000 {
};
chosen {
- stdout-path = &uart0;
+ stdout-path = "serial0:115200n8";
};
leds {
diff --git a/arch/arm/boot/dts/ti/omap/am335x-boneblue.dts b/arch/arm/boot/dts/ti/omap/am335x-boneblue.dts
index f579df4c2c540dd7..d430f0bef1653782 100644
--- a/arch/arm/boot/dts/ti/omap/am335x-boneblue.dts
+++ b/arch/arm/boot/dts/ti/omap/am335x-boneblue.dts
@@ -13,7 +13,7 @@ / {
compatible = "ti,am335x-bone-blue", "ti,am33xx";
chosen {
- stdout-path = &uart0;
+ stdout-path = "serial0:115200n8";
};
leds {
diff --git a/arch/arm/boot/dts/ti/omap/am335x-chiliboard.dts b/arch/arm/boot/dts/ti/omap/am335x-chiliboard.dts
index 648e97fe1dfd5e5b..ae5bc589849722f5 100644
--- a/arch/arm/boot/dts/ti/omap/am335x-chiliboard.dts
+++ b/arch/arm/boot/dts/ti/omap/am335x-chiliboard.dts
@@ -12,7 +12,7 @@ / {
"ti,am33xx";
chosen {
- stdout-path = &uart0;
+ stdout-path = "serial0:115200n8";
};
leds {
diff --git a/arch/arm/boot/dts/ti/omap/am335x-evm.dts b/arch/arm/boot/dts/ti/omap/am335x-evm.dts
index 20222f82f21bfd9d..856fa1191ed24ea3 100644
--- a/arch/arm/boot/dts/ti/omap/am335x-evm.dts
+++ b/arch/arm/boot/dts/ti/omap/am335x-evm.dts
@@ -23,7 +23,7 @@ memory@...00000 {
};
chosen {
- stdout-path = &uart0;
+ stdout-path = "serial0:115200n8";
};
vbat: fixedregulator0 {
diff --git a/arch/arm/boot/dts/ti/omap/am335x-evmsk.dts b/arch/arm/boot/dts/ti/omap/am335x-evmsk.dts
index eba888dcd60e7fa2..d8baccdf8bc46302 100644
--- a/arch/arm/boot/dts/ti/omap/am335x-evmsk.dts
+++ b/arch/arm/boot/dts/ti/omap/am335x-evmsk.dts
@@ -30,7 +30,7 @@ memory@...00000 {
};
chosen {
- stdout-path = &uart0;
+ stdout-path = "serial0:115200n8";
};
vbat: fixedregulator0 {
diff --git a/arch/arm/boot/dts/ti/omap/am335x-guardian.dts b/arch/arm/boot/dts/ti/omap/am335x-guardian.dts
index 4b070e634b28100b..6ce3a2d029eedc8c 100644
--- a/arch/arm/boot/dts/ti/omap/am335x-guardian.dts
+++ b/arch/arm/boot/dts/ti/omap/am335x-guardian.dts
@@ -14,7 +14,7 @@ / {
compatible = "bosch,am335x-guardian", "ti,am33xx";
chosen {
- stdout-path = &uart0;
+ stdout-path = "serial0:115200n8";
tick-timer = &timer2;
};
diff --git a/arch/arm/boot/dts/ti/omap/am335x-icev2.dts b/arch/arm/boot/dts/ti/omap/am335x-icev2.dts
index 6f0f4fba043b96e9..ba488bba6925dec3 100644
--- a/arch/arm/boot/dts/ti/omap/am335x-icev2.dts
+++ b/arch/arm/boot/dts/ti/omap/am335x-icev2.dts
@@ -22,7 +22,7 @@ memory@...00000 {
};
chosen {
- stdout-path = &uart3;
+ stdout-path = "serial3:115200n8";
};
vbat: fixedregulator0 {
diff --git a/arch/arm/boot/dts/ti/omap/am335x-myirtech-myd.dts b/arch/arm/boot/dts/ti/omap/am335x-myirtech-myd.dts
index 06a352f98b220bc4..476a6bdaf43f38e4 100644
--- a/arch/arm/boot/dts/ti/omap/am335x-myirtech-myd.dts
+++ b/arch/arm/boot/dts/ti/omap/am335x-myirtech-myd.dts
@@ -15,7 +15,7 @@ / {
compatible = "myir,myd-am335x", "myir,myc-am335x", "ti,am33xx";
chosen {
- stdout-path = &uart0;
+ stdout-path = "serial0:115200n8";
};
clk12m: clk12m {
diff --git a/arch/arm/boot/dts/ti/omap/am335x-osd3358-sm-red.dts b/arch/arm/boot/dts/ti/omap/am335x-osd3358-sm-red.dts
index d28d397288476504..23caaaabf35134a6 100644
--- a/arch/arm/boot/dts/ti/omap/am335x-osd3358-sm-red.dts
+++ b/arch/arm/boot/dts/ti/omap/am335x-osd3358-sm-red.dts
@@ -147,7 +147,7 @@ simple-audio-card,codec {
};
chosen {
- stdout-path = &uart0;
+ stdout-path = "serial0:115200n8";
};
leds {
diff --git a/arch/arm/boot/dts/ti/omap/am335x-pdu001.dts b/arch/arm/boot/dts/ti/omap/am335x-pdu001.dts
index c9ccb9de21ad7b10..9f611debc209072c 100644
--- a/arch/arm/boot/dts/ti/omap/am335x-pdu001.dts
+++ b/arch/arm/boot/dts/ti/omap/am335x-pdu001.dts
@@ -21,7 +21,7 @@ / {
compatible = "ti,am33xx";
chosen {
- stdout-path = &uart3;
+ stdout-path = "serial3:115200n8";
};
cpus {
diff --git a/arch/arm/boot/dts/ti/omap/am335x-pocketbeagle.dts b/arch/arm/boot/dts/ti/omap/am335x-pocketbeagle.dts
index 78ce860e59b3de4f..24d9f90fad01f768 100644
--- a/arch/arm/boot/dts/ti/omap/am335x-pocketbeagle.dts
+++ b/arch/arm/boot/dts/ti/omap/am335x-pocketbeagle.dts
@@ -15,7 +15,7 @@ / {
compatible = "ti,am335x-pocketbeagle", "ti,am335x-bone", "ti,am33xx";
chosen {
- stdout-path = &uart0;
+ stdout-path = "serial0:115200n8";
};
leds {
diff --git a/arch/arm/boot/dts/ti/omap/am335x-sl50.dts b/arch/arm/boot/dts/ti/omap/am335x-sl50.dts
index f3524e5ee43e276d..1dc4e344efd63e4e 100644
--- a/arch/arm/boot/dts/ti/omap/am335x-sl50.dts
+++ b/arch/arm/boot/dts/ti/omap/am335x-sl50.dts
@@ -25,7 +25,7 @@ memory@...00000 {
};
chosen {
- stdout-path = &uart0;
+ stdout-path = "serial0:115200n8";
};
leds {
--
2.43.0
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