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: <b24c2124-fe3b-246c-9af9-3ecee9fb32d4@kernel.org>
Date:   Wed, 12 Jul 2023 14:21:57 +0300
From:   Roger Quadros <rogerq@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Nishanth Menon <nm@...com>,
        Jayesh Choudhary <j-choudhary@...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 12/07/2023 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

-- 
cheers,
-roger