linux-kernel - Re: [PATCH v5 1/5] arm64: dts: ti: k3-j784s4-main: Add system controller and SERDES lane mux

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Message-ID: <5d2ec125-1f05-2316-1e9a-24b5d85aa4c9@ti.com>
Date:   Wed, 12 Jul 2023 18:13:55 +0530
From:   Jayesh Choudhary <j-choudhary@...com>
To:     Roger Quadros <rogerq@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Nishanth Menon <nm@...com>
CC:     <vigneshr@...com>, <krzysztof.kozlowski+dt@...aro.org>,
        <afd@...com>, <s-vadapalli@...com>, <kristo@...nel.org>,
        <robh+dt@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/5] arm64: dts: ti: k3-j784s4-main: Add system
 controller and SERDES lane mux



On 12/07/23 16:51, Roger Quadros wrote:
> 
> 
> On 12/07/2023 08:44, Krzysztof Kozlowski wrote:
>> On 11/07/2023 17:31, Nishanth Menon wrote:
>>> On 12:01-20230711, Jayesh Choudhary wrote:
>>>>
>>>>
>>>> On 10/07/23 17:13, Krzysztof Kozlowski wrote:
>>>>> On 10/07/2023 12:17, 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 2ea0adae6832..68cc2fa053e7 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>
>>>>>
>>>>> Why? What do you use from that binding?
>>>>>
>>>>
>>>> Missed idle-state in the mux-controller node here for default values.
>>>> I will wait for more feedback and then re-spin the series.
>>>
>>> btw, I am wondering if ti-serdes.h should even exist in dt-bindings -
>>> are any of the macros used in the driver? or should this follow the
>>> pinctrl style macros that could happily reside in arch/arm64/boot/dts/ti
>>> ?
>>
>> I don't see any usage in drivers, which is a clear indication that it
>> might not be suitable for bindings. What are these values? Look like
>> some register values, which there is little sense in making a binding.
>>
>> Best regards,
>> Krzysztof
>>
>>
> 
> You are right. They are constants not used in the driver directly.
> mmio-mux driver uses it to set the idle state of the mux via the
> 'idle-states' property.
> 
> I agree with Nishanth that they should be moved to arch/arm64/boot/dts/ti
> 

Then I will do the cleanup for all platforms and then post the dependent
series before spinning v6.

Thanks and Warm regards,
-Jayesh