Re: [PATCH v1 6/6] ARM: dts: lan966x: add basic Kontron KSwitch D10 support

[<Claudiu.Beznea@microchip.com>]

On 03.03.2022 18:03, Michael Walle wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Add basic support for the Kontron KSwitch D10 MMT 6G-2GS which
> features 6 Gigabit copper ports and two SFP cages. For now the
> following is working:
>  - Kernel console
>  - SFP cages I2C bus and mux
>  - SPI
>  - SGPIO
>  - Watchdog
> 
> Signed-off-by: Michael Walle <michael@walle.cc>
> ---
>  arch/arm/boot/dts/Makefile                    |   3 +-
>  ...lan966x-kontron-kswitch-d10-mmt-6g-2gs.dts | 159 ++++++++++++++++++
>  2 files changed, 161 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm/boot/dts/lan966x-kontron-kswitch-d10-mmt-6g-2gs.dts
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index 085c43649d44..86dd0f9804ee 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -739,7 +739,8 @@ dtb-$(CONFIG_SOC_IMX7ULP) += \
>         imx7ulp-com.dtb \
>         imx7ulp-evk.dtb
>  dtb-$(CONFIG_SOC_LAN966) += \
> -       lan966x-pcb8291.dtb
> +       lan966x-pcb8291.dtb \
> +       lan966x-kontron-kswitch-d10-mmt-6g-2gs.dtb
>  dtb-$(CONFIG_SOC_LS1021A) += \
>         ls1021a-moxa-uc-8410a.dtb \
>         ls1021a-qds.dtb \
> diff --git a/arch/arm/boot/dts/lan966x-kontron-kswitch-d10-mmt-6g-2gs.dts b/arch/arm/boot/dts/lan966x-kontron-kswitch-d10-mmt-6g-2gs.dts
> new file mode 100644
> index 000000000000..958678dec7ad
> --- /dev/null
> +++ b/arch/arm/boot/dts/lan966x-kontron-kswitch-d10-mmt-6g-2gs.dts
> @@ -0,0 +1,159 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Device Tree file for the Kontron KSwitch D10 MMT 6G-2GS
> + */
> +
> +/dts-v1/;
> +#include "lan966x.dtsi"
> +
> +/ {
> +       model = "Kontron KSwitch D10 MMT 6G-2GS";
> +       compatible = "kontron,kswitch-d10-mmt-6g-2gs", "kontron,s1921",
> +                    "microchip,lan9668", "microchip,lan966";
> +
> +       aliases {
> +               serial0 = &usart0;
> +       };
> +
> +       chosen {
> +               stdout-path = "serial0:115200n8";
> +       };
> +
> +       gpio-restart {
> +               compatible = "gpio-restart";
> +               gpios = <&gpio 56 GPIO_ACTIVE_LOW>;
> +               priority = <200>;
> +       };
> +
> +       i2cmux {
> +               compatible = "i2c-mux-gpio";
> +               #address-cells = <1>;
> +               #size-cells = <0>;
> +               mux-gpios = <&sgpio_out 3 2 GPIO_ACTIVE_HIGH>,
> +                           <&sgpio_out 3 3 GPIO_ACTIVE_HIGH>;
> +               i2c-parent = <&i2c4>;
> +
> +               i2c4_0: i2c@1 {
> +                       reg = <1>;
> +                       #address-cells = <1>;
> +                       #size-cells = <0>;
> +               };
> +
> +               i2c4_1: i2c@2 {
> +                       reg = <2>;
> +                       #address-cells = <1>;
> +                       #size-cells = <0>;
> +               };
> +       };
> +
> +       sfp0: sfp0 {
> +               compatible = "sff,sfp";
> +               i2c-bus = <&i2c4_0>;
> +               los-gpios = <&sgpio_in 1 0 GPIO_ACTIVE_HIGH>;
> +               mod-def0-gpios = <&sgpio_in 1 1 GPIO_ACTIVE_LOW>;
> +               maximum-power-milliwatt = <2500>;
> +               tx-disable-gpios = <&sgpio_out 3 0 GPIO_ACTIVE_LOW>;
> +               tx-fault-gpios = <&sgpio_in 0 2 GPIO_ACTIVE_HIGH>;
> +               rate-select0-gpios = <&sgpio_out 2 0 GPIO_ACTIVE_HIGH>;
> +               rate-select1-gpios = <&sgpio_out 2 1 GPIO_ACTIVE_HIGH>;
> +       };
> +
> +       sfp1: sfp1 {
> +               compatible = "sff,sfp";
> +               i2c-bus = <&i2c4_1>;
> +               los-gpios = <&sgpio_in 1 2 GPIO_ACTIVE_HIGH>;
> +               mod-def0-gpios = <&sgpio_in 1 3 GPIO_ACTIVE_LOW>;
> +               maximum-power-milliwatt = <2500>;
> +               tx-disable-gpios = <&sgpio_out 3 1 GPIO_ACTIVE_LOW>;
> +               tx-fault-gpios = <&sgpio_in 0 3 GPIO_ACTIVE_HIGH>;
> +               rate-select0-gpios = <&sgpio_out 2 2 GPIO_ACTIVE_HIGH>;
> +               rate-select1-gpios = <&sgpio_out 2 3 GPIO_ACTIVE_HIGH>;
> +       };
> +};
> +
> +&flx0 {
> +       atmel,flexcom-mode = <ATMEL_FLEXCOM_MODE_USART>;
> +       status = "okay";
> +};
> +
> +&flx3 {
> +       atmel,flexcom-mode = <ATMEL_FLEXCOM_MODE_SPI>;
> +       status = "okay";
> +};
> +
> +&flx4 {
> +       atmel,flexcom-mode = <ATMEL_FLEXCOM_MODE_TWI>;
> +       status = "okay";
> +};

Although there is 1:1 mapping b/w ids of flexcoms and the embedded blocks
(flxX has usartX, i2cX, spiX) and there is nothing wrong with the approach
here I found a bit hard to follow if the correspondent embedded block
(i2c, spi, usart) is enabled or not.

> +
> +&gpio {
> +       usart0_pins: usart0-pins {
> +               /* RXD, TXD */
> +               pins = "GPIO_25", "GPIO_26";
> +               function = "fc0_b";
> +       };
> +
> +       sgpio_a_pins: sgpio-a-pins {
> +               /* SCK, D0, D1, LD */
> +               pins = "GPIO_32", "GPIO_33", "GPIO_34";
> +               function = "sgpio_a";
> +       };
> +
> +       sgpio_b_pins: sgpio-b-pins {
> +               /* SCK, D0, D1, LD */
> +               pins = "GPIO_64";
> +               function = "sgpio_b";
> +       };
> +
> +       fc3_b_pins: fc3-b-spi-pins {
> +               /* SCK, MISO, MOSI */
> +               pins = "GPIO_51", "GPIO_52", "GPIO_53";
> +               function = "fc3_b";
> +       };
> +
> +       fc4_b_pins: fc4-b-i2c-pins {
> +               /* RXD, TXD */
> +               pins = "GPIO_57", "GPIO_58";
> +               function = "fc4_b";
> +       };
> +};
> +
> +&i2c4 {
> +       pinctrl-0 = <&fc4_b_pins>;
> +       pinctrl-names = "default";
> +       status = "okay";
> +};
> +
> +&usart0 {
> +       pinctrl-0 = <&usart0_pins>;
> +       pinctrl-names = "default";
> +       status = "okay";
> +};
> +
> +&sgpio {
> +       pinctrl-0 = <&sgpio_a_pins>, <&sgpio_b_pins>;
> +       pinctrl-names = "default";
> +       bus-frequency = <8000000>;
> +       /* arbitrary range because all GPIOs are in software mode */
> +       microchip,sgpio-port-ranges = <0 11>;
> +       status = "okay";
> +};
> +
> +&sgpio_in {
> +       ngpios = <128>;
> +};
> +
> +&sgpio_out {
> +       ngpios = <128>;
> +};
> +
> +&spi3 {
> +       pinctrl-0 = <&fc3_b_pins>;
> +       pinctrl-names = "default";
> +       cs-gpios = <&gpio 46 GPIO_ACTIVE_LOW>;
> +       status = "okay";
> +};
> +
> +&watchdog {
> +       status = "okay";
> +};
> --
> 2.30.2
>