linux-kernel - Re: [PATCH v1] arm64: dts: qcom: sc7280: Remove CTS/RTS configuration

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Message-Id: <D0LINETM8WNA.27BORT75W1N0C@fairphone.com>
Date: Tue, 16 Apr 2024 13:38:43 +0200
From: "Luca Weiss" <luca.weiss@...rphone.com>
To: "Viken Dadhaniya" <quic_vdadhani@...cinc.com>,
 <cros-qcom-dts-watchers@...omium.org>, <andersson@...nel.org>,
 <konrad.dybcio@...aro.org>, <swboyd@...omium.org>, <robh@...nel.org>,
 <krzk+dt@...nel.org>, <linux-arm-msm@...r.kernel.org>,
 <conor+dt@...nel.org>, <devicetree@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <rajpat@...eaurora.org>,
 <mka@...omium.org>, <rojay@...eaurora.org>
Cc: <quic_msavaliy@...cinc.com>, <quic_anupkulk@...cinc.com>
Subject: Re: [PATCH v1] arm64: dts: qcom: sc7280: Remove CTS/RTS
 configuration

On Tue Apr 16, 2024 at 12:56 PM CEST, Viken Dadhaniya wrote:
> Remove CTS and RTS pinctrl configuration for UART5 node as
> it's designed for debug UART for all the board variants of the
> sc7280 chipset.
>
> Also change compatible string to debug UART.

This change has little to do with the SoC design though and is dependent
on the usage on a given board, right? Also the QCM6490 datasheet
mentions gpio21 & gpio22 can be used for UART_CTS and UART_RFR.

But at least consistency-wise this change makes sense, in practically
all other SoCs one UART is marked as geni-debug-uart.

But with this patch you should then also remove some overrides that are
placed in various boards already?

arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts:     compatible = "qcom,geni-debug-uart";
arch/arm64/boot/dts/qcom/qcm6490-idp.dts:       compatible = "qcom,geni-debug-uart";
arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts:   compatible = "qcom,geni-debug-uart";
arch/arm64/boot/dts/qcom/sc7280-idp.dtsi:       compatible = "qcom,geni-debug-uart";
arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi:     compatible = "qcom,geni-debug-uart";

Regards
Luca

>
> Fixes: 38cd93f413fd ("arm64: dts: qcom: sc7280: Update QUPv3 UART5 DT node")
> Signed-off-by: Viken Dadhaniya <quic_vdadhani@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/sc7280.dtsi | 14 ++------------
>  1 file changed, 2 insertions(+), 12 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> index 38c183b2bb26..2a6b4c4639d1 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -1440,12 +1440,12 @@
>  			};
>  
>  			uart5: serial@...000 {
> -				compatible = "qcom,geni-uart";
> +				compatible = "qcom,geni-debug-uart";
>  				reg = <0 0x00994000 0 0x4000>;
>  				clocks = <&gcc GCC_QUPV3_WRAP0_S5_CLK>;
>  				clock-names = "se";
>  				pinctrl-names = "default";
> -				pinctrl-0 = <&qup_uart5_cts>, <&qup_uart5_rts>, <&qup_uart5_tx>, <&qup_uart5_rx>;
> +				pinctrl-0 = <&qup_uart5_tx>, <&qup_uart5_rx>;
>  				interrupts = <GIC_SPI 606 IRQ_TYPE_LEVEL_HIGH>;
>  				power-domains = <&rpmhpd SC7280_CX>;
>  				operating-points-v2 = <&qup_opp_table>;
> @@ -5397,16 +5397,6 @@
>  				function = "qup04";
>  			};
>  
> -			qup_uart5_cts: qup-uart5-cts-state {
> -				pins = "gpio20";
> -				function = "qup05";
> -			};
> -
> -			qup_uart5_rts: qup-uart5-rts-state {
> -				pins = "gpio21";
> -				function = "qup05";
> -			};
> -
>  			qup_uart5_tx: qup-uart5-tx-state {
>  				pins = "gpio22";
>  				function = "qup05";