linux-kernel - Re: [PATCH 1/4] arm64: dts: ti: k3-j721e-main: Fix external refclk input to SERDES

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Date:   Thu, 13 May 2021 17:41:08 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Nishanth Menon <nm@...com>
CC:     Tero Kristo <kristo@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Lokesh Vutla <lokeshvutla@...com>
Subject: Re: [PATCH 1/4] arm64: dts: ti: k3-j721e-main: Fix external refclk
 input to SERDES

Hi Nishanth,

On 13/05/21 12:21 am, Nishanth Menon wrote:
> On 20:42-20210512, Kishon Vijay Abraham I wrote:
>> Rename the external refclk inputs to the SERDES from
>> dummy_cmn_refclk/dummy_cmn_refclk1 to cmn_refclk/cmn_refclk1
>> respectively. Also move the external refclk DT nodes outside the
>> cbass_main DT node. Since in j721e common processor board, only the
>> cmn_refclk1 is connected to 100MHz clock, fix the clock frequency.
>>
>> Fixes: afd094ebe69f ("arm64: dts: ti: k3-j721e-main: Add WIZ and SERDES PHY nodes")
> 
> Assume we want this part of 5.13 fixes?

This doesn't fix any functionality. Okay for me to go in 5.14 along with
the rest of the series.
> 
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>>  .../dts/ti/k3-j721e-common-proc-board.dts     |  4 ++
>>  arch/arm64/boot/dts/ti/k3-j721e-main.dtsi     | 58 ++++++++++---------
>>  2 files changed, 34 insertions(+), 28 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
>> index 60764366e22b..86f7ab511ee8 100644
>> --- a/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
>> +++ b/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
>> @@ -635,6 +635,10 @@
>>  	status = "disabled";
>>  };
>>  
>> +&cmn_refclk1 {
>> +	clock-frequency = <100000000>;
>> +};
>> +
>>  &serdes0 {
>>  	serdes0_pcie_link: link@0 {
>>  		reg = <0>;
>> diff --git a/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi b/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
>> index c2aa45a3ac79..002a0c1520ee 100644
>> --- a/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
>> +++ b/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
>> @@ -8,6 +8,20 @@
>>  #include <dt-bindings/mux/mux.h>
>>  #include <dt-bindings/mux/ti-serdes.h>
>>  
>> +/ {
>> +	cmn_refclk: cmn-refclk {
>> +		#clock-cells = <0>;
>> +		compatible = "fixed-clock";
>> +		clock-frequency = <0>;
>> +	};
>> +
>> +	cmn_refclk1: cmn-refclk1 {
> 
> Just curious: why cant we use the standard nodenames with clock?

We can use standard names here. Is there any defined nodename for
clocks? clk or clock? Don't see $nodename defined for clocks in
dt-schema repository.

Thanks
Kishon