[PATCH v2 1/2] arm64: dts: mediatek: alias all enabled serial ports

Carlo Caione <[email protected]> Mon, 27 Jul 2026 09:38:08 +0200
Newsgroups	org.kernel.vger.linux-serial,org.infradead.lists.linux-arm-kernel,org.infradead.lists.linux-mediatek,org.kernel.vger.linux-devicetree,org.kernel.vger.linux-kernel
Message-ID	<20260727-ccaione-genio-serial-aliases-v2-1-0f2ae41a8e89@baylibre.com>
On most MediaTek boards only serial0 is aliased, so the remaining
enabled uarts get first-free ttyS line numbers from the 8250 core in
probe order. When the console uart defers on its clocks another uart can
win line 0: console=ttyS0 then ends up on the wrong port and the boot
looks like a hang on the serial console, depending on probe order.

Signed-off-by: Carlo Caione <[email protected]>
---
 arch/arm64/boot/dts/mediatek/mt6795-sony-xperia-m5.dts    | 1 +
 arch/arm64/boot/dts/mediatek/mt7622-rfb1.dts              | 1 +
 arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3.dts  | 2 ++
 arch/arm64/boot/dts/mediatek/mt7986a-rfb.dts              | 2 ++
 arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi            | 1 +
 arch/arm64/boot/dts/mediatek/mt8192-asurada-hayato-r1.dts | 4 ++++
 arch/arm64/boot/dts/mediatek/mt8195-demo.dts              | 1 +
 arch/arm64/boot/dts/mediatek/mt8365-evk.dts               | 2 ++
 arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi     | 2 ++
 arch/arm64/boot/dts/mediatek/mt8390-grinn-genio-sbc.dtsi  | 2 ++
 arch/arm64/boot/dts/mediatek/mt8390-tungsten-smarc.dtsi   | 2 ++
 arch/arm64/boot/dts/mediatek/mt8395-genio-common.dtsi     | 1 +
 12 files changed, 21 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt6795-sony-xperia-m5.dts b/arch/arm64/boot/dts/mediatek/mt6795-sony-xperia-m5.dts
index 0e086dd487d9..63659e240b1d 100644
--- a/arch/arm64/boot/dts/mediatek/mt6795-sony-xperia-m5.dts
+++ b/arch/arm64/boot/dts/mediatek/mt6795-sony-xperia-m5.dts
@@ -20,6 +20,7 @@ aliases {
 		mmc2 = &mmc2;
 		serial0 = &uart0;
 		serial1 = &uart1;
+		serial2 = &uart2;
 	};
 
 	backlight_lcd0: backlight {
diff --git a/arch/arm64/boot/dts/mediatek/mt7622-rfb1.dts b/arch/arm64/boot/dts/mediatek/mt7622-rfb1.dts
index 8c3e2e2578bc..7bccad118d24 100644
--- a/arch/arm64/boot/dts/mediatek/mt7622-rfb1.dts
+++ b/arch/arm64/boot/dts/mediatek/mt7622-rfb1.dts
@@ -20,6 +20,7 @@ / {
 
 	aliases {
 		serial0 = &uart0;
+		serial2 = &uart2;
 	};
 
 	chosen {
diff --git a/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3.dts b/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3.dts
index 19f538d160ab..637e5567c1e0 100644
--- a/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3.dts
+++ b/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3.dts
@@ -21,6 +21,8 @@ / {
 
 	aliases {
 		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
 		ethernet0 = &gmac0;
 		ethernet1 = &gmac1;
 	};
diff --git a/arch/arm64/boot/dts/mediatek/mt7986a-rfb.dts b/arch/arm64/boot/dts/mediatek/mt7986a-rfb.dts
index 5d8e3d3f6c20..9dfd882ca484 100644
--- a/arch/arm64/boot/dts/mediatek/mt7986a-rfb.dts
+++ b/arch/arm64/boot/dts/mediatek/mt7986a-rfb.dts
@@ -16,6 +16,8 @@ / {
 
 	aliases {
 		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
 	};
 
 	chosen {
diff --git a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
index a8e257b21a88..ae957deac8df 100644
--- a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
@@ -13,6 +13,7 @@
 / {
 	aliases {
 		serial0 = &uart0;
+		serial1 = &uart1;
 		mmc0 = &mmc0;
 		mmc1 = &mmc1;
 	};
diff --git a/arch/arm64/boot/dts/mediatek/mt8192-asurada-hayato-r1.dts b/arch/arm64/boot/dts/mediatek/mt8192-asurada-hayato-r1.dts
index ac2673e56fb8..233711cb4556 100644
--- a/arch/arm64/boot/dts/mediatek/mt8192-asurada-hayato-r1.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8192-asurada-hayato-r1.dts
@@ -9,6 +9,10 @@ / {
 	model = "Google Hayato rev1";
 	chassis-type = "convertible";
 	compatible = "google,hayato-rev1", "google,hayato", "mediatek,mt8192";
+
+	aliases {
+		serial1 = &uart1;
+	};
 };
 
 &keyboard_controller {
diff --git a/arch/arm64/boot/dts/mediatek/mt8195-demo.dts b/arch/arm64/boot/dts/mediatek/mt8195-demo.dts
index 1f59b5786b81..13132a35080f 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195-demo.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8195-demo.dts
@@ -19,6 +19,7 @@ / {
 
 	aliases {
 		serial0 = &uart0;
+		serial1 = &uart1;
 	};
 
 	chosen {
diff --git a/arch/arm64/boot/dts/mediatek/mt8365-evk.dts b/arch/arm64/boot/dts/mediatek/mt8365-evk.dts
index a30ee523b0b5..c535de34dfac 100644
--- a/arch/arm64/boot/dts/mediatek/mt8365-evk.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8365-evk.dts
@@ -24,6 +24,8 @@ aliases {
 		mmc0 = &mmc0;
 		mmc1 = &mmc1;
 		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
 	};
 
 	chosen {
diff --git a/arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi b/arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi
index b0c97930a0e6..26e24431d467 100644
--- a/arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi
@@ -33,6 +33,8 @@ aliases {
 		mmc0 = &mmc0;
 		mmc1 = &mmc1;
 		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
 	};
 
 	backlight_lcm1: backlight-lcm1 {
diff --git a/arch/arm64/boot/dts/mediatek/mt8390-grinn-genio-sbc.dtsi b/arch/arm64/boot/dts/mediatek/mt8390-grinn-genio-sbc.dtsi
index 888248a75e93..51f12328a1d6 100644
--- a/arch/arm64/boot/dts/mediatek/mt8390-grinn-genio-sbc.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8390-grinn-genio-sbc.dtsi
@@ -17,6 +17,8 @@ aliases {
 		i2c5 = &i2c5;
 		i2c6 = &i2c6;
 		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
 	};
 
 	chosen {
diff --git a/arch/arm64/boot/dts/mediatek/mt8390-tungsten-smarc.dtsi b/arch/arm64/boot/dts/mediatek/mt8390-tungsten-smarc.dtsi
index 9f5a0ec563e8..668985428fc2 100644
--- a/arch/arm64/boot/dts/mediatek/mt8390-tungsten-smarc.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8390-tungsten-smarc.dtsi
@@ -31,6 +31,8 @@ aliases {
 		rtc0 = &rv3028;
 		rtc1 = &mt6359rtc;
 		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
 	};
 
 	backlight_lcd0: backlight-lcd0 {
diff --git a/arch/arm64/boot/dts/mediatek/mt8395-genio-common.dtsi b/arch/arm64/boot/dts/mediatek/mt8395-genio-common.dtsi
index edc5539bebde..86e487fb1832 100644
--- a/arch/arm64/boot/dts/mediatek/mt8395-genio-common.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8395-genio-common.dtsi
@@ -22,6 +22,7 @@ aliases {
 		mmc0 = &mmc0;
 		mmc1 = &mmc1;
 		serial0 = &uart0;
+		serial1 = &uart1;
 	};
 
 	chosen {

-- 
2.55.0