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

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Message-ID: <588e4d0a-78c6-553f-3c40-0d248f4c92f9@ti.com>
Date: Wed, 8 May 2024 18:04:53 +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 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.

>> +		compatible = "fixed-clock";
>> +		#clock-cells = <0>;
>> +		clock-frequency = <0>;
>> +	};
>> +
>> +	serdes_wiz0: wiz@...0000 {
> 
> Should generic name be phy?

Since serdes is used for both USB and PCIe,
I can go with "phy".

> 
>> +		compatible = "ti,am64-wiz-10g";
>> +		ranges = <0x0f000000 0x0 0x0f000000 0x00010000>;
>> +		#address-cells = <1>;
>> +		#size-cells = <1>;
>> +		power-domains = <&k3_pds 279 TI_SCI_PD_EXCLUSIVE>;
>> +		clocks = <&k3_clks 279 0>, <&k3_clks 279 1>, <&serdes_refclk>;
>> +		clock-names = "fck", "core_ref_clk", "ext_ref_clk";
>> +		num-lanes = <1>;
>> +		#reset-cells = <1>;
>> +		#clock-cells = <1>;
>> +
>> +		assigned-clocks = <&k3_clks 279 1>;
>> +		assigned-clock-parents = <&k3_clks 279 5>;
>> +
>> +		serdes0: serdes@...0000 {
> 
> here too?

I could use "phy" here as well. 
https://elixir.bootlin.com/linux/latest/source/arch/arm64/boot/dts/qcom/sa8775p.dtsi#L1853
https://elixir.bootlin.com/linux/latest/source/arch/arm64/boot/dts/renesas/r8a779f0.dtsi#L563

> 
>> +			compatible = "ti,j721e-serdes-10g";

[...]

> 

-- 
Regards,
Ravi