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: <da5b4576-fa6e-4134-236a-4054644dc8a8@ti.com>
Date:   Mon, 15 May 2023 14:25:01 +0530
From:   "Verma, Achal" <a-verma1@...com>
To:     Siddharth Vadapalli <s-vadapalli@...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>,
        Achal Verma <a-verma1@...com>
Subject: Re: [PATCH v4 1/5] arm64: dts: ti: k3-j784s4-main: Add system
 controller and SERDES lane mux



On 5/15/2023 1:06 PM, Siddharth Vadapalli wrote:
> 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
I got the doubt because of the address used in this [1] series was 
different. Now I realized that it was wrong and it got corrected in this 
patch. So yeah its clear now, 0x100000 is indeed the correct base address.

[1] 
https://serenity.dal.design.ti.com/patchwork/project/linux-patch-review/patch/20220927202534.17148-3-mranostay@ti.com/
> 
>>
>> 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>;
>