linux-kernel - Re: [PATCH v2 6/6] arm64: dts: ti: k3-j7200-common-proc-board: Add USB support

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Date:   Tue, 8 Sep 2020 07:36:51 -0500
From:   Nishanth Menon <nm@...com>
To:     Roger Quadros <rogerq@...com>
CC:     <t-kristo@...com>, <robh+dt@...nel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <nsekhar@...com>,
        <kishon@...com>
Subject: Re: [PATCH v2 6/6] arm64: dts: ti: k3-j7200-common-proc-board: Add
 USB support

On 17:52-20200907, Roger Quadros wrote:
> Enable USB0 port in high-speed (2.0) mode.


Am I right that this is a choice forced by serdes mux configuration
selection? Might be good to document it (default speed is super-speed).

> 
> The board uses lane 3 of SERDES for USB. Set the mux
> accordingly.
> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>  .../dts/ti/k3-j7200-common-proc-board.dts     | 22 +++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
> index 0ecaba600704..5ce3fddbd617 100644
> --- a/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
> +++ b/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
> @@ -42,6 +42,12 @@
>  			J721E_IOPAD(0xe4, PIN_INPUT, 8) /* (V1) TIMER_IO0.MMC1_SDCD */
>  		>;
>  	};
> +
> +	main_usbss0_pins_default: main-usbss0-pins-default {
> +		pinctrl-single,pins = <
> +			J721E_IOPAD(0x120, PIN_OUTPUT, 0) /* (T4) USB0_DRVVBUS */
> +		>;
> +	};
>  };
>  
>  &wkup_uart0 {
> @@ -145,3 +151,19 @@
>  	idle-states = <SERDES0_LANE0_PCIE1_LANE0>, <SERDES0_LANE1_PCIE1_LANE1>,
>  		      <SERDES0_LANE2_QSGMII_LANE1>, <SERDES0_LANE3_IP4_UNUSED>;
>  };
> +
> +&usb_serdes_mux {
> +	idle-states = <1>; /* USB0 to SERDES lane 3 */
> +};
> +
> +&usbss0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&main_usbss0_pins_default>;
> +	ti,vbus-divider;
> +	ti,usb2-only;
> +};
> +
> +&usb0 {
> +	dr_mode = "otg";
> +	maximum-speed = "high-speed";
> +};
> -- 
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
> 

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