linux-kernel - Re: [PATCH v2 6/6] arm64: dts: khadas-vim3: add commented support for PCIe

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Message-ID: <20190916134546.GS9720@e119886-lin.cambridge.arm.com>
Date:   Mon, 16 Sep 2019 14:45:47 +0100
From:   Andrew Murray <andrew.murray@....com>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     khilman@...libre.com, lorenzo.pieralisi@....com, kishon@...com,
        bhelgaas@...gle.com, linux-amlogic@...ts.infradead.org,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, yue.wang@...ogic.com, maz@...nel.org,
        repk@...plefau.lt, nick@...das.com, gouwa@...das.com
Subject: Re: [PATCH v2 6/6] arm64: dts: khadas-vim3: add commented support
 for PCIe

On Mon, Sep 16, 2019 at 02:50:22PM +0200, Neil Armstrong wrote:
> The VIM3 on-board  MCU can mux the PCIe/USB3.0 shared differential
> lines using a FUSB340TMX USB 3.1 SuperSpeed Data Switch between
> an USB3.0 Type A connector and a M.2 Key M slot.
> The PHY driving these differential lines is shared between
> the USB3.0 controller and the PCIe Controller, thus only
> a single controller can use it.
> 
> The needed DT configuration when the MCU is configured to mux
> the PCIe/USB3.0 differential lines to the M.2 Key M slot is
> added commented and may be uncommented to disable USB3.0 from the
> USB Complex and enable the PCIe controller.
> 
> The End User is not expected to uncomment the following except for
> testing purposes, but instead rely on the firmware/bootloader to
> update these nodes accordingly if PCIe mode is selected by the MCU.
> 
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>

Reviewed-by: Andrew Murray <andrew.murray@....com>

> ---
>  .../amlogic/meson-g12b-a311d-khadas-vim3.dts  | 25 +++++++++++++++++++
>  .../amlogic/meson-g12b-s922x-khadas-vim3.dts  | 25 +++++++++++++++++++
>  .../boot/dts/amlogic/meson-khadas-vim3.dtsi   |  4 +++
>  .../dts/amlogic/meson-sm1-khadas-vim3l.dts    | 25 +++++++++++++++++++
>  4 files changed, 79 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-a311d-khadas-vim3.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-a311d-khadas-vim3.dts
> index 3a6a1e0c1e32..124a80901084 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12b-a311d-khadas-vim3.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-a311d-khadas-vim3.dts
> @@ -14,3 +14,28 @@
>  / {
>  	compatible = "khadas,vim3", "amlogic,a311d", "amlogic,g12b";
>  };
> +
> +/*
> + * The VIM3 on-board  MCU can mux the PCIe/USB3.0 shared differential
> + * lines using a FUSB340TMX USB 3.1 SuperSpeed Data Switch between
> + * an USB3.0 Type A connector and a M.2 Key M slot.
> + * The PHY driving these differential lines is shared between
> + * the USB3.0 controller and the PCIe Controller, thus only
> + * a single controller can use it.
> + * If the MCU is configured to mux the PCIe/USB3.0 differential lines
> + * to the M.2 Key M slot, uncomment the following block to disable
> + * USB3.0 from the USB Complex and enable the PCIe controller.
> + * The End User is not expected to uncomment the following except for
> + * testing purposes, but instead rely on the firmware/bootloader to
> + * update these nodes accordingly if PCIe mode is selected by the MCU.
> + */
> +/*
> +&pcie {
> +	status = "okay";
> +};
> +
> +&usb {
> +	phys = <&usb2_phy0>, <&usb2_phy1>;
> +	phy-names = "usb2-phy0", "usb2-phy1";
> +};
> + */
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-s922x-khadas-vim3.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-s922x-khadas-vim3.dts
> index b73deb282120..bba98f982ad6 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12b-s922x-khadas-vim3.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-s922x-khadas-vim3.dts
> @@ -14,3 +14,28 @@
>  / {
>  	compatible = "khadas,vim3", "amlogic,s922x", "amlogic,g12b";
>  };
> +
> +/*
> + * The VIM3 on-board  MCU can mux the PCIe/USB3.0 shared differential
> + * lines using a FUSB340TMX USB 3.1 SuperSpeed Data Switch between
> + * an USB3.0 Type A connector and a M.2 Key M slot.
> + * The PHY driving these differential lines is shared between
> + * the USB3.0 controller and the PCIe Controller, thus only
> + * a single controller can use it.
> + * If the MCU is configured to mux the PCIe/USB3.0 differential lines
> + * to the M.2 Key M slot, uncomment the following block to disable
> + * USB3.0 from the USB Complex and enable the PCIe controller.
> + * The End User is not expected to uncomment the following except for
> + * testing purposes, but instead rely on the firmware/bootloader to
> + * update these nodes accordingly if PCIe mode is selected by the MCU.
> + */
> +/*
> +&pcie {
> +	status = "okay";
> +};
> +
> +&usb {
> +	phys = <&usb2_phy0>, <&usb2_phy1>;
> +	phy-names = "usb2-phy0", "usb2-phy1";
> +};
> + */
> diff --git a/arch/arm64/boot/dts/amlogic/meson-khadas-vim3.dtsi b/arch/arm64/boot/dts/amlogic/meson-khadas-vim3.dtsi
> index 4fe7d33ebe8a..90815fa25ec6 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-khadas-vim3.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-khadas-vim3.dtsi
> @@ -246,6 +246,10 @@
>  	linux,rc-map-name = "rc-khadas";
>  };
>  
> +&pcie {
> +	reset-gpios = <&gpio GPIOA_8 GPIO_ACTIVE_LOW>;
> +};
> +
>  &pwm_ef {
>          status = "okay";
>          pinctrl-0 = <&pwm_e_pins>;
> diff --git a/arch/arm64/boot/dts/amlogic/meson-sm1-khadas-vim3l.dts b/arch/arm64/boot/dts/amlogic/meson-sm1-khadas-vim3l.dts
> index 5233bd7cacfb..dbbf29a0dbf6 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-sm1-khadas-vim3l.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-sm1-khadas-vim3l.dts
> @@ -68,3 +68,28 @@
>  	clock-names = "clkin1";
>  	status = "okay";
>  };
> +
> +/*
> + * The VIM3 on-board  MCU can mux the PCIe/USB3.0 shared differential
> + * lines using a FUSB340TMX USB 3.1 SuperSpeed Data Switch between
> + * an USB3.0 Type A connector and a M.2 Key M slot.
> + * The PHY driving these differential lines is shared between
> + * the USB3.0 controller and the PCIe Controller, thus only
> + * a single controller can use it.
> + * If the MCU is configured to mux the PCIe/USB3.0 differential lines
> + * to the M.2 Key M slot, uncomment the following block to disable
> + * USB3.0 from the USB Complex and enable the PCIe controller.
> + * The End User is not expected to uncomment the following except for
> + * testing purposes, but instead rely on the firmware/bootloader to
> + * update these nodes accordingly if PCIe mode is selected by the MCU.
> + */
> +/*
> +&pcie {
> +	status = "okay";
> +};
> +
> +&usb {
> +	phys = <&usb2_phy0>, <&usb2_phy1>;
> +	phy-names = "usb2-phy0", "usb2-phy1";
> +};
> + */
> -- 
> 2.22.0
>