linux-kernel - Re: [PATCH v8 1/5] arm64: dts: ti: k3-j784s4-main: Add system controller and SERDES lane mux

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Message-ID: <28f8ea2c-05bb-d293-22cc-93b22ff203cc@ti.com>
Date:   Tue, 1 Aug 2023 09:19:30 -0500
From:   Andrew Davis <afd@...com>
To:     Jayesh Choudhary <j-choudhary@...com>, <nm@...com>,
        <vigneshr@...com>
CC:     <s-vadapalli@...com>, <kristo@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <rogerq@...nel.org>, <a-bhatia1@...com>, <r-ravikumar@...com>,
        <sabiya.d@...com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v8 1/5] arm64: dts: ti: k3-j784s4-main: Add system
 controller and SERDES lane mux

On 8/1/23 2:00 AM, Jayesh Choudhary wrote:
> From: Siddharth Vadapalli <s-vadapalli@...com>
> 
> The system controller node manages the CTRL_MMR0 region.
> Add serdes_ln_ctrl node which is used for controlling the SERDES lane mux.
> 
> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
> [j-choudhary@...com: Fix serdes_ln_ctrl node]
> Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
> ---
>   arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi | 40 ++++++++++++++++++++++
>   1 file changed, 40 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
> index 11f163e5cadf..8a816563706b 100644
> --- a/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
> @@ -5,6 +5,10 @@
>    * Copyright (C) 2022 Texas Instruments Incorporated - https://www.ti.com/
>    */
>   
> +#include <dt-bindings/mux/mux.h>
> +
> +#include "k3-serdes.h"
> +
>   &cbass_main {
>   	msmc_ram: sram@...00000 {
>   		compatible = "mmio-sram";
> @@ -26,6 +30,42 @@ l3cache-sram@...000 {
>   		};
>   	};
>   
> +	scm_conf: bus@...000 {
> +		compatible = "simple-bus";
> +		reg = <0x00 0x00100000 0x00 0x1c000>;
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges = <0x00 0x00 0x00100000 0x1c000>;
> +
> +		serdes_ln_ctrl: mux-controller@...0 {
> +			compatible = "mmio-mux";

The parent is not a syscon node, this should be "reg-mux".

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/mux/reg-mux.yaml#n19

Andrew

> +			reg = <0x00004080 0x30>;
> +			#mux-control-cells = <1>;
> +			mux-reg-masks = <0x4080 0x3>, <0x4084 0x3>, /* SERDES0 lane0/1 select */
> +					<0x4088 0x3>, <0x408c 0x3>, /* SERDES0 lane2/3 select */
> +					<0x4090 0x3>, <0x4094 0x3>, /* SERDES1 lane0/1 select */
> +					<0x4098 0x3>, <0x409c 0x3>, /* SERDES1 lane2/3 select */
> +					<0x40a0 0x3>, <0x40a4 0x3>, /* SERDES2 lane0/1 select */
> +					<0x40a8 0x3>, <0x40ac 0x3>; /* SERDES2 lane2/3 select */
> +			idle-states = <J784S4_SERDES0_LANE0_PCIE1_LANE0>,
> +				      <J784S4_SERDES0_LANE1_PCIE1_LANE1>,
> +				      <J784S4_SERDES0_LANE2_IP3_UNUSED>,
> +				      <J784S4_SERDES0_LANE3_USB>,
> +				      <J784S4_SERDES1_LANE0_PCIE0_LANE0>,
> +				      <J784S4_SERDES1_LANE1_PCIE0_LANE1>,
> +				      <J784S4_SERDES1_LANE2_PCIE0_LANE2>,
> +				      <J784S4_SERDES1_LANE3_PCIE0_LANE3>,
> +				      <J784S4_SERDES2_LANE0_IP2_UNUSED>,
> +				      <J784S4_SERDES2_LANE1_IP2_UNUSED>,
> +				      <J784S4_SERDES2_LANE2_QSGMII_LANE1>,
> +				      <J784S4_SERDES2_LANE3_QSGMII_LANE2>,
> +				      <J784S4_SERDES4_LANE0_EDP_LANE0>,
> +				      <J784S4_SERDES4_LANE1_EDP_LANE1>,
> +				      <J784S4_SERDES4_LANE2_EDP_LANE2>,
> +				      <J784S4_SERDES4_LANE3_EDP_LANE3>;
> +		};
> +	};
> +
>   	gic500: interrupt-controller@...0000 {
>   		compatible = "arm,gic-v3";
>   		#address-cells = <2>;