linux-kernel - Re: [PATCH v4 1/5] arm64: dts: ti: k3-j784s4-main: Add system controller and SERDES lane mux

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Message-ID: <65c6a354-434b-4e50-81ec-8ce705df2888@ti.com>
Date:   Mon, 15 May 2023 13:06:31 +0530
From:   Siddharth Vadapalli <s-vadapalli@...com>
To:     "Verma, Achal" <a-verma1@...com>
CC:     Jayesh Choudhary <j-choudhary@...com>, <nm@...com>,
        <vigneshr@...com>, <krzysztof.kozlowski+dt@...aro.org>,
        <afd@...com>, <kristo@...nel.org>, <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <s-vadapalli@...com>
Subject: Re: [PATCH v4 1/5] arm64: dts: ti: k3-j784s4-main: Add system
 controller and SERDES lane mux

Achal,

On 15/05/23 11:25, Verma, Achal wrote:
> Hi,
> 
> On 4/25/2023 6:46 PM, 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: Add reg property to fix dtc warning]
>> Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
>> ---
>>   arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi | 23 ++++++++++++++++++++++
>>   1 file changed, 23 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
>> b/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
>> index e9169eb358c1..29be6d28ee31 100644
>> --- a/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
>> +++ b/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
>> @@ -5,6 +5,9 @@
>>    * Copyright (C) 2022 Texas Instruments Incorporated - https://www.ti.com/
>>    */
>>   +#include <dt-bindings/mux/mux.h>
>> +#include <dt-bindings/mux/ti-serdes.h>
>> +
>>   &cbass_main {
>>       msmc_ram: sram@...00000 {
>>           compatible = "mmio-sram";
>> @@ -26,6 +29,26 @@ l3cache-sram@...000 {
>>           };
>>       };
>>   +    scm_conf: syscon@...000 {
> Please check syscon address.

0x100000 is the base address of the CTRL_MMR module. Could you please clarify
why the address is incorrect? The registers for J784S4 SoC can be viewed at:
https://www.ti.com/lit/zip/spruj52

> 
> Thanks,
> Achal Verma
>> +        compatible = "ti,j721e-system-controller", "syscon", "simple-mfd";
>> +        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";
>> +            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 */
>> +        };
>> +    };
>> +
>>       gic500: interrupt-controller@...0000 {
>>           compatible = "arm,gic-v3";
>>           #address-cells = <2>;

-- 
Regards,
Siddharth.