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

Roger Quadros
2023-07-12T11:22:06Z

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@ti.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@ti.com>
>>>>> [j-choudhary@ti.com: Add reg property to fix dtc warning]
>>>>> Signed-off-by: Jayesh Choudhary <j-choudhary@ti.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