linux-kernel - Re: [PATCH v14 4/8] arm64: dts: ti: k3-j721s2-common-proc-board: Enable SERDES0

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Message-ID: <86ab17b2-d35a-16e2-7791-9e7a13c8e632@kernel.org>
Date:   Tue, 25 Apr 2023 14:45:22 +0300
From:   Roger Quadros <rogerq@...nel.org>
To:     Ravi Gunasekaran <r-gunasekaran@...com>, nm@...com, afd@...com,
        vigneshr@...com, kristo@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, s-vadapalli@...com,
        vaishnav.a@...com
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v14 4/8] arm64: dts: ti: k3-j721s2-common-proc-board:
 Enable SERDES0

Hi,

On 31/03/2023 12:00, Ravi Gunasekaran wrote:
> From: Aswath Govindraju <a-govindraju@...com>
> 
> Configure first lane to PCIe, the second lane to USB and the last two lanes
> to eDP. Also, add sub-nodes to SERDES0 DT node to represent SERDES0 is
> connected to PCIe.

Is USB0 expected to work in super-speed on this board?
If yes then you need to add USB0 lane information as well.
Otherwise please ignore my comment.

> 
> Signed-off-by: Aswath Govindraju <a-govindraju@...com>
> Signed-off-by: Matt Ranostay <mranostay@...com>
> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@...com>
> ---
> I had reviewed this patch in the v5 series [0].
> Since I'm taking over upstreaming this series, I removed the self
> Reviewed-by tag.
> 
> [0] - https://lore.kernel.org/all/71ce4ecd-2a50-c69d-28be-f1a8d769970e@ti.com/
> 
> changes from v13:
> * No changes. Only rebased on top of linux-next
> 
> Changes from v12:
> * Removed enabling of "serdes_wiz" node that is already enabled in [2/8]
>   in this version
> 
> Changes from v11:
> * No change
> 
> Changes from v10:
> * Removed Link tag from commit message
> 
> Changes from v9:
> * Enabled serdes related nodes
> 
> Changes from v8:
> * No change
> 
> Changes from v7:
> * No change
> 
> Changes from v6:
> * No change
> 
> Changes from v5:
> * Removed Cc tags from commit message
> 
> Changes from v4:
> * No change
> 
> Changes from v3:
> * No change
> 
> Changes from v2:
> * No change
> 
> Changes from v1:
> * No change
> 
>  .../dts/ti/k3-j721s2-common-proc-board.dts    | 23 +++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
> index b4b9edfe2d12..1afefaf3f974 100644
> --- a/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
> +++ b/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
> @@ -9,6 +9,9 @@
>  
>  #include "k3-j721s2-som-p0.dtsi"
>  #include <dt-bindings/net/ti-dp83867.h>
> +#include <dt-bindings/phy/phy-cadence.h>
> +#include <dt-bindings/phy/phy.h>
> +#include <dt-bindings/mux/ti-serdes.h>
>  
>  / {
>  	compatible = "ti,j721s2-evm", "ti,j721s2";
> @@ -322,6 +325,26 @@
>  	phy-handle = <&phy0>;
>  };
>  
> +&serdes_ln_ctrl {
> +	idle-states = <J721S2_SERDES0_LANE0_PCIE1_LANE0>, <J721S2_SERDES0_LANE1_USB>,
> +		      <J721S2_SERDES0_LANE2_EDP_LANE2>, <J721S2_SERDES0_LANE3_EDP_LANE3>;
> +};
> +
> +&serdes_refclk {
> +	clock-frequency = <100000000>;
> +};
> +
> +&serdes0 {
> +	status = "okay";
> +	serdes0_pcie_link: phy@0 {
> +		reg = <0>;
> +		cdns,num-lanes = <1>;
> +		#phy-cells = <0>;
> +		cdns,phy-type = <PHY_TYPE_PCIE>;
> +		resets = <&serdes_wiz0 1>;
> +	};
> +};
> +
>  &mcu_mcan0 {
>  	status = "okay";
>  	pinctrl-names = "default";

cheers,
-roger