linux-kernel - [PATCH 2/6] arm64: dts: ti: k3-am64: Remove UART baud rate selection

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Date: Tue, 26 Mar 2024 13:54:37 -0500
From: Andrew Davis <afd@...com>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
        Tero
 Kristo <kristo@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof
 Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley
	<conor+dt@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Andrew Davis <afd@...com>
Subject: [PATCH 2/6] arm64: dts: ti: k3-am64: Remove UART baud rate selection

As described in the binding document for the "current-speed" property:

"This should only be present in case a driver has no chance to know the
baud rate of the slave device."

This is not the case for the UART used in K3 devices, the current
baud-rate can be calculated from the registers. Having this property
has the effect of actually skipping the baud-rate setup in some drivers
as it assumes it will already be set to this rate, which may not always
be the case.

It seems this property's purpose was mistaken as selecting the desired
baud-rate, which it does not. It would have been wrong to select that
here anyway as DT is not the place for configuration, especially when
there are already more standard ways to set serial baud-rates.

Signed-off-by: Andrew Davis <afd@...com>
---
 arch/arm64/boot/dts/ti/k3-am642-evm.dts                  | 1 -
 arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-rdk.dts | 2 --
 arch/arm64/boot/dts/ti/k3-am642-sk.dts                   | 1 -
 3 files changed, 4 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am642-evm.dts b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
index 53fe1d065ddbb..e20e4ffd0f1fa 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-evm.dts
@@ -473,7 +473,6 @@ &main_uart0 {
 	status = "okay";
 	pinctrl-names = "default";
 	pinctrl-0 = <&main_uart0_pins_default>;
-	current-speed = <115200>;
 };
 
 /* main_uart1 is reserved for firmware usage */
diff --git a/arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-rdk.dts b/arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-rdk.dts
index 8237b8c815b84..dc774f9c75417 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-rdk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-rdk.dts
@@ -275,7 +275,6 @@ &main_uart0 {
 	status = "okay";
 	pinctrl-names = "default";
 	pinctrl-0 = <&main_uart0_pins_default>;
-	current-speed = <115200>;
 };
 
 &main_uart1 {
@@ -283,7 +282,6 @@ &main_uart1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&main_uart1_pins_default>;
 	uart-has-rtscts;
-	current-speed = <115200>;
 };
 
 &sdhci1 {
diff --git a/arch/arm64/boot/dts/ti/k3-am642-sk.dts b/arch/arm64/boot/dts/ti/k3-am642-sk.dts
index 67cd41bf806ea..5b028b3a3192f 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-sk.dts
@@ -381,7 +381,6 @@ &main_uart0 {
 	status = "okay";
 	pinctrl-names = "default";
 	pinctrl-0 = <&main_uart0_pins_default>;
-	current-speed = <115200>;
 };
 
 &main_uart1 {
-- 
2.39.2