linux-kernel - Re: [PATCH RESEND 2/6] arm64: dts: ti: k3-j721s2-main: Add SERDES and WIZ device tree node

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Date:   Thu, 1 Sep 2022 16:47:31 -0700
From:   Matt Ranostay <mranostay@...com>
To:     Vignesh Raghavendra <vigneshr@...com>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Nishanth Menon <nm@...com>
Subject: Re: [PATCH RESEND 2/6] arm64: dts: ti: k3-j721s2-main: Add SERDES
 and WIZ device tree node

On Thu, Sep 01, 2022 at 02:15:28PM +0530, Vignesh Raghavendra wrote:
> 
> 
> On 10/08/22 15:09, Matt Ranostay wrote:
> > From: Aswath Govindraju <a-govindraju@...com>
> > 
> > Add dt node for the single instance of WIZ (SERDES wrapper) and
> > SERDES module shared by PCIe, eDP and USB.
> > 
> > Cc: Vignesh Raghavendra <vigneshr@...com>
> > Cc: Nishanth Menon <nm@...com>
> > Acked-by: Matt Ranostay <mranostay@...com>
> > Signed-off-by: Aswath Govindraju <a-govindraju@...com>
> > ---
> >  arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi | 70 ++++++++++++++++++++++
> >  1 file changed, 70 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> > index f7e359da8690..f1e02d896168 100644
> > --- a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> > +++ b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> > @@ -5,6 +5,13 @@
> >   * Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com/
> >   */
> >  
> > +/ {
> > +	serdes_refclk: serdes-refclk {
> 
> clk-X
>

So something like 'serdes_refclk: clock-cmnrefclk' would seem to match the current
naming style of other K3 platforms (albeit except j7200).

> > +		#clock-cells = <0>;
> > +		compatible = "fixed-clock";
> > +	};
> > +};
> > +
> >  &cbass_main {
> >  	msmc_ram: sram@...00000 {
> >  		compatible = "mmio-sram";
> > @@ -33,6 +40,13 @@ scm_conf: scm-conf@...000 {
> >  		#size-cells = <1>;
> >  		ranges = <0x00 0x00 0x00104000 0x18000>;
> >  
> > +		serdes_ln_ctrl: mux-controller@80 {
> 
> mux-controller-X
> 

80 is the index into the mmio region. So should it still have @ for the node
name?

Also this is how the rest of the K3 platforms reference the mux controller.

> > +			compatible = "mmio-mux";
> > +			#mux-control-cells = <1>;
> > +			mux-reg-masks = <0x80 0x3>, <0x84 0x3>, /* SERDES0 lane0/1 select */
> > +					<0x88 0x3>, <0x8c 0x3>; /* SERDES0 lane2/3 select */
> > +		};
> > +
> >  		usb_serdes_mux: mux-controller@0 {
> >  			compatible = "mmio-mux";
> >  			#mux-control-cells = <1>;
> > @@ -728,6 +742,62 @@ usb0: usb@...0000 {
> >  		};
> >  	};
> >  
> > +	serdes_wiz0: wiz@...0000 {
> > +		compatible = "ti,j721e-wiz-10g";
> > +		#address-cells = <1>;
> > +		#size-cells = <1>;
> > +		power-domains = <&k3_pds 365 TI_SCI_PD_EXCLUSIVE>;
> > +		clocks = <&k3_clks 365 0>, <&k3_clks 365 3>, <&serdes_refclk>;
> > +		clock-names = "fck", "core_ref_clk", "ext_ref_clk";
> > +		num-lanes = <4>;
> > +		#reset-cells = <1>;
> > +		ranges = <0x5060000 0x0 0x5060000 0x10000>;
> > +
> > +		assigned-clocks = <&k3_clks 365 3>;
> > +		assigned-clock-parents = <&k3_clks 365 7>;
> > +
> > +		wiz0_pll0_refclk: pll0-refclk {
> 
> please use generic node name clk-X here and elsewhere in the patch

So something like 'wiz0_pll0_refclk: clk-refpll0'?

- Matt

> 
> > +			clocks = <&k3_clks 365 3>, <&serdes_refclk>;
> > +			clock-output-names = "wiz0_pll0_refclk";
> > +			#clock-cells = <0>;
> > +			assigned-clocks = <&wiz0_pll0_refclk>;
> > +			assigned-clock-parents = <&k3_clks 365 3>;
> > +		};
> > +
> > +		wiz0_pll1_refclk: pll1-refclk {
> 
> ditto
> 
> > +			clocks = <&k3_clks 365 3>, <&serdes_refclk>;
> > +			clock-output-names = "wiz0_pll1_refclk";
> > +			#clock-cells = <0>;
> > +			assigned-clocks = <&wiz0_pll1_refclk>;
> > +			assigned-clock-parents = <&k3_clks 365 3>;
> > +		};
> > +
> > +		wiz0_refclk_dig: refclk-dig {
> 
> ditto
> 
> > +			clocks = <&k3_clks 365 3>, <&serdes_refclk>;
> > +			clock-output-names = "wiz0_refclk_dig";
> > +			#clock-cells = <0>;
> > +			assigned-clocks = <&wiz0_refclk_dig>;
> > +			assigned-clock-parents = <&k3_clks 365 3>;
> > +		};
> > +
> > +		wiz0_cmn_refclk_dig_div: cmn-refclk-dig-div {
> 
> ditto
> 
> > +			clocks = <&wiz0_refclk_dig>;
> > +			#clock-cells = <0>;
> > +		};
> > +
> > +		serdes0: serdes@...0000 {
> > +			compatible = "ti,j721e-serdes-10g";
> > +			reg = <0x05060000 0x00010000>;
> > +			reg-names = "torrent_phy";
> > +			resets = <&serdes_wiz0 0>;
> > +			reset-names = "torrent_reset";
> > +			clocks = <&wiz0_pll0_refclk>;
> > +			clock-names = "refclk";
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +		};
> > +	};
> > +
> >  	main_mcan0: can@...1000 {
> >  		compatible = "bosch,m_can";
> >  		reg = <0x00 0x02701000 0x00 0x200>,
> 
> -- 
> Regards
> Vignesh