linux-kernel - Re: [PATCH 1/3] arm64: dts: ti: k3-j722s: Add support for SERDES0

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Date: Wed, 8 May 2024 18:56:05 +0530
From: Ravi Gunasekaran <r-gunasekaran@...com>
To: Roger Quadros <rogerq@...nel.org>, <nm@...com>, <vigneshr@...com>
CC: <kristo@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <srk@...com>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Ravi
 Gunasekaran <r-gunasekaran@...com>
Subject: Re: [PATCH 1/3] arm64: dts: ti: k3-j722s: Add support for SERDES0



On 5/8/24 6:32 PM, Roger Quadros wrote:
> 
> 
> On 08/05/2024 15:34, Ravi Gunasekaran wrote:
>>
>>
>> On 5/8/24 5:29 PM, Roger Quadros wrote:
>>>
>>>
>>> On 29/04/2024 15:09, Ravi Gunasekaran wrote:
>>>> Add SERDES0 and its wrapper description to support USB3
>>>> and SGMII interfaces.
>>>>
>>>> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@...com>
>>>> ---
>>>>  arch/arm64/boot/dts/ti/k3-j722s.dtsi | 54 ++++++++++++++++++++++++++++
>>>>  1 file changed, 54 insertions(+)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/ti/k3-j722s.dtsi b/arch/arm64/boot/dts/ti/k3-j722s.dtsi
>>>> index c75744edb143..beba5a3ea6cc 100644
>>>> --- a/arch/arm64/boot/dts/ti/k3-j722s.dtsi
>>>> +++ b/arch/arm64/boot/dts/ti/k3-j722s.dtsi
>>>> @@ -9,6 +9,7 @@
>>>>  #include <dt-bindings/interrupt-controller/irq.h>
>>>>  #include <dt-bindings/interrupt-controller/arm-gic.h>
>>>>  #include <dt-bindings/soc/ti,sci_pm_domain.h>
>>>> +#include <dt-bindings/phy/phy-ti.h>
>>>>  
>>>>  #include "k3-am62p5.dtsi"
>>>>  
>>>> @@ -75,6 +76,50 @@
>>>>  			 <0x00 0x78000000 0x00 0x78000000 0x00 0x00008000>,
>>>>  			 <0x00 0x78100000 0x00 0x78100000 0x00 0x00008000>;
>>>>  	};
>>>> +
>>>> +	serdes_refclk: clock-cmnrefclk {
>>>
>>> What could be the generic name here?
>>>
>>
>> How about phy-clk or serdes-clk?
>> I searched for "fixed-clock" and wide range of naming conventions is followed.
> 
> We shouldn't encode the clock function in the name. How about just clk-<n> ?
> where <n> is an integer starting from 0 for such fixed-clocks on the platform?
> 

Sure. I can follow this notation.

> e.g. from arch/arm64/boot/dts/ti/k3-am62p5-sk.dts
> 
>         tlv320_mclk: clk-0 {
>                 #clock-cells = <0>;
>                 compatible = "fixed-clock";
>                 clock-frequency = <12288000>;
>         };
> 
>>

[...]

>>
> 

-- 
Regards,
Ravi