linux-kernel - Re: [PATCH 1/2] arm64: dts: ti: k3-am64: Add SERDES DT node

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Message-ID: <eb05e914-9fa6-d12d-918a-949e1d243e43@ti.com>
Date:   Fri, 19 Mar 2021 19:59:57 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Aswath Govindraju <a-govindraju@...com>
CC:     Vignesh Raghavendra <vigneshr@...com>,
        Lokesh Vutla <lokeshvutla@...com>, Nishanth Menon <nm@...com>,
        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>
Subject: Re: [PATCH 1/2] arm64: dts: ti: k3-am64: Add SERDES DT node

Hi Aswath,

On 19/03/21 1:30 pm, Aswath Govindraju wrote:
> From: Kishon Vijay Abraham I <kishon@...com>
> 
> Add SERDES DT node for the single one lane SERDES present in
> AM64.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> Signed-off-by: Aswath Govindraju <a-govindraju@...com>
> ---
>  arch/arm64/boot/dts/ti/k3-am64-main.dtsi | 52 ++++++++++++++++++++++++
>  1 file changed, 52 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
> index a03b66456062..5a62a96c048c 100644
> --- a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
> @@ -5,6 +5,17 @@
>   * Copyright (C) 2020-2021 Texas Instruments Incorporated - https://www.ti.com/
>   */
>  
> +#include <dt-bindings/phy/phy-cadence-torrent.h>

One of my patches in other series which renames the header file will
cause issues here :-/
http://lore.kernel.org/r/20210319124128.13308-9-kishon@ti.com

We'll need a immutable tag for this as well.
> +#include <dt-bindings/phy/phy-ti.h>
> +
> +/ {
> +	serdes_refclk: serdes-refclk {
> +		#clock-cells = <0>;
> +		compatible = "fixed-clock";
> +		clock-frequency = <100000000>;
> +	};

Clock frequency of serdes_refclk depends on how it is tied in the EVM.
In the case of AM64EVM there is no external clock generator.

It should be something like in
https://github.com/kishon/linux-wip/commit/e5196b0819d334ce8a21b398b7c47557a145d250

Thanks
Kishon

> +};
> +
>  &cbass_main {
>  	oc_sram: sram@...00000 {
>  		compatible = "mmio-sram";
> @@ -184,6 +195,12 @@
>  			reg = <0x4044 0x8>;
>  			#phy-cells = <1>;
>  		};
> +
> +		serdes_ln_ctrl: mux {
> +			compatible = "mmio-mux";
> +			#mux-control-cells = <1>;
> +			mux-reg-masks = <0x4080 0x3>; /* SERDES0 lane0 select */
> +		};
>  	};
>  
>  	main_uart0: serial@...0000 {
> @@ -477,6 +494,41 @@
>  		};
>  	};
>  
> +	serdes_wiz0: wiz@...0000 {
> +		compatible = "ti,am64-wiz-10g";
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		power-domains = <&k3_pds 162 TI_SCI_PD_EXCLUSIVE>;
> +		clocks = <&k3_clks 162 0>, <&k3_clks 162 1>, <&serdes_refclk>;
> +		clock-names = "fck", "core_ref_clk", "ext_ref_clk";
> +		num-lanes = <1>;
> +		#reset-cells = <1>;
> +		#clock-cells = <1>;
> +		ranges = <0x0f000000 0x0 0x0f000000 0x00010000>;
> +		assigned-clocks = <&k3_clks 162 1>;
> +		assigned-clock-parents = <&k3_clks 162 5>;
> +
> +		serdes0: serdes@...0000 {
> +			compatible = "ti,j721e-serdes-10g";
> +			reg = <0x0f000000 0x00010000>;
> +			reg-names = "torrent_phy";
> +			resets = <&serdes_wiz0 0>;
> +			reset-names = "torrent_reset";
> +			clocks = <&serdes_wiz0 TI_WIZ_PLL0_REFCLK>,
> +				 <&serdes_wiz0 TI_WIZ_PHY_EN_REFCLK>;
> +			clock-names = "refclk", "phy_en_refclk";
> +			assigned-clocks = <&serdes_wiz0 TI_WIZ_PLL0_REFCLK>,
> +					  <&serdes_wiz0 TI_WIZ_PLL1_REFCLK>,
> +					  <&serdes_wiz0 TI_WIZ_REFCLK_DIG>;
> +			assigned-clock-parents = <&k3_clks 162 1>,
> +						 <&k3_clks 162 1>,
> +						 <&k3_clks 162 1>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			#clock-cells = <1>;
> +		};
> +	};
> +
>  	cpts@...00000 {
>  		compatible = "ti,j721e-cpts";
>  		reg = <0x0 0x39000000 0x0 0x400>;
>