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

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Message-ID: <20210513140137.5uvftgtsku3xfobz@engraving>
Date:   Thu, 13 May 2021 09:01:37 -0500
From:   Nishanth Menon <nm@...com>
To:     Kishon Vijay Abraham I <kishon@...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

On 17:41-20210513, Kishon Vijay Abraham I wrote:
> 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.

Looking at the fixed-clock example, lets go with clock

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D