linux-kernel - Re: [PATCH v6 1/5] arm64: dts: ti: k3-j784s4-main: Add system controller and SERDES lane mux

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Message-ID: <5f5269dd-3cff-6fff-909d-355c190001d2@ti.com>
Date:   Thu, 27 Jul 2023 15:48:48 +0530
From:   Jayesh Choudhary <j-choudhary@...com>
To:     Nishanth Menon <nm@...com>, <s-vadapalli@...com>, <afd@...com>
CC:     <vigneshr@...com>, <krzysztof.kozlowski+dt@...aro.org>,
        <kristo@...nel.org>, <robh+dt@...nel.org>, <conor+dt@...nel.org>,
        <rogerq@...nel.org>, <a-bhatia1@...com>, <r-ravikumar@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 1/5] arm64: dts: ti: k3-j784s4-main: Add system
 controller and SERDES lane mux



On 24/07/23 22:22, Nishanth Menon wrote:
> On 18:50-20230721, 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..5a4da4eb8d3d 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: syscon@...000 {
>> +		compatible = "ti,j721e-system-controller", "syscon", "simple-mfd";
> 
> Would'nt a simple-bus work?
> https://lore.kernel.org/all/20230605205220.rjmcsi5tjn4auqa7@arose/

For serdes_ln_ctrl it will be okay but for phy_gmii_sel,
we have dependency on [1].

So I will drop main_cpsw node (patch 2/5) and then re-spin it with
"simple-bus" compatible.
CPSW node can be taken up later on when the driver changes are in.


[1]: 
https://lore.kernel.org/all/b16568ec-0428-981b-01ca-571cc5d52704@ti.com/


Warm Regards,
Jayesh