[PATCH v2 1/2] ARM64: dts: mediatek: fix MT7531 reset GPIO polarity on multiple boards

[Chen Minqiang]

The MT7531 reset pin is active-low, but several DTS files configured the
reset-gpios property without GPIO_ACTIVE_LOW. This causes the reset GPIO
to behave as active-high and prevents the switch from being properly reset.

Update all affected DTS files to correctly use GPIO_ACTIVE_LOW so that
the reset polarity matches the hardware design.

Boards fixed:
 - mt7622-bananapi-bpi-r64
 - mt7622-rfb1
 - mt7986a-bananapi-bpi-r3
 - mt7986a-rfb
 - mt7986b-rfb

Note: the previous DTS description used the wrong polarity but the
driver also assumed the opposite polarity, resulting in a matched pair
of bugs that worked together. Updating the DTS requires updating the
driver at the same time; old kernels will not reset the switch correctly
when used with this DTS.

Compatibility
-------------

Correcting the polarity creates intentional incompatibility:

 * New kernel + old DTS:
   The driver now expects active-low, but out-of-tree DTS still marks
   active-high, causing the reset sequence to invert.

 * Old kernel + new DTS:
   The old driver toggles reset assuming active-high, which now
   conflicts with the corrected active-low DTS.

This was unavoidable because the original DTS was factually wrong.
Out-of-tree DTS users must update their DTS together with the kernel.

Signed-off-by: Chen Minqiang <ptpt52 at gmail.com>
---
 arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts | 2 +-
 arch/arm64/boot/dts/mediatek/mt7622-rfb1.dts             | 2 +-
 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/mt7986b-rfb.dts             | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts b/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts
index 9f100b18a676..6f29ce828fdb 100644
--- a/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts
+++ b/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts
@@ -155,7 +155,7 @@
 			interrupt-controller;
 			#interrupt-cells = <1>;
 			interrupts-extended = <&pio 53 IRQ_TYPE_LEVEL_HIGH>;
-			reset-gpios = <&pio 54 0>;
+			reset-gpios = <&pio 54 GPIO_ACTIVE_LOW>;
 
 			ports {
 				#address-cells = <1>;
diff --git a/arch/arm64/boot/dts/mediatek/mt7622-rfb1.dts b/arch/arm64/boot/dts/mediatek/mt7622-rfb1.dts
index 8c3e2e2578bc..6600f06ccebf 100644
--- a/arch/arm64/boot/dts/mediatek/mt7622-rfb1.dts
+++ b/arch/arm64/boot/dts/mediatek/mt7622-rfb1.dts
@@ -137,7 +137,7 @@
 		switch at 0 {
 			compatible = "mediatek,mt7531";
 			reg = <0>;
-			reset-gpios = <&pio 54 0>;
+			reset-gpios = <&pio 54 GPIO_ACTIVE_LOW>;
 
 			ports {
 				#address-cells = <1>;
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 e7654dc9a1c9..8ec2ec78ee46 100644
--- a/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3.dts
+++ b/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3.dts
@@ -203,7 +203,7 @@
 		interrupt-parent = <&pio>;
 		interrupts = <66 IRQ_TYPE_LEVEL_HIGH>;
 		#interrupt-cells = <1>;
-		reset-gpios = <&pio 5 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&pio 5 GPIO_ACTIVE_LOW>;
 	};
 };
 
diff --git a/arch/arm64/boot/dts/mediatek/mt7986a-rfb.dts b/arch/arm64/boot/dts/mediatek/mt7986a-rfb.dts
index 5d8e3d3f6c20..958ce291336b 100644
--- a/arch/arm64/boot/dts/mediatek/mt7986a-rfb.dts
+++ b/arch/arm64/boot/dts/mediatek/mt7986a-rfb.dts
@@ -87,7 +87,7 @@
 	switch: switch at 0 {
 		compatible = "mediatek,mt7531";
 		reg = <31>;
-		reset-gpios = <&pio 5 0>;
+		reset-gpios = <&pio 5 1>;
 	};
 };
 
diff --git a/arch/arm64/boot/dts/mediatek/mt7986b-rfb.dts b/arch/arm64/boot/dts/mediatek/mt7986b-rfb.dts
index 58f77d932429..0780b5a36259 100644
--- a/arch/arm64/boot/dts/mediatek/mt7986b-rfb.dts
+++ b/arch/arm64/boot/dts/mediatek/mt7986b-rfb.dts
@@ -64,7 +64,7 @@
 		switch at 0 {
 			compatible = "mediatek,mt7531";
 			reg = <31>;
-			reset-gpios = <&pio 5 0>;
+			reset-gpios = <&pio 5 1>;
 
 			ports {
 				#address-cells = <1>;
-- 
2.17.1