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

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Date:   Wed, 12 Jul 2023 07:44:46 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     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 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