Snickerdoodle Black Tips

Wi-Fi

Part.	EN	IRQ	CLK	CMD	SDIO0	SDIO1	SDIO2	SDIO3
Zynq PS	MIO 9	MIO 0	MIO 12	MIO 11	MIO 10	MIO 13	MIO 14	MIO 15
WL1837	Pin 40	Pin 14	Pin 8	Pin 6	Pin 10	Pin 11	Pin 12	Pin 13

Kernel configuration

• Enable MAC80211, CFG80211, CFG80211_WEXT, WL18XX, WLCORE_SDIO

Device tree

Add the following entry:

#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>

/include/ "system-conf.dtsi"
/ {
    wlan_en_reg: fixedregulator@2 {
        compatible = "regulator-fixed";
        regulator-name = "wlan-en-regulator";
        regulator-min-microvolt = <1800000>;
        regulator-max-microvolt = <1800000>;
        startup-delay-us = <70000>;

        // WLAN_EN GPIO for this board
        gpio = <&gpio0 9 GPIO_ACTIVE_HIGH>;
        enable-active-high;
    };
};

&sdhci1 {
    // Wi-Fi
    vmmc-supply = <&wlan_en_reg>;
    bus-width = <4>;
    cap-power-off-card;
    keep-power-in-suspend;
    #address-cells = <1>;
    #size-cells = <0>;

    wlcore: wlcore@2 {
        compatible = "ti,wl1837";
        reg = <2>;
        interrupt-parent = <&gpio0>;
        interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
    };
};

Note on Wi-Fi firmware

File Name	Note
wl18xx-fw-4.bin	WiLink firmware (main firmware file); source
wl18xx-conf.bin	System configuration file
wl1271-nvs.bin	Optional; used for setting user-defined MAC

• References:
  • WiLink8 Linux Wi-Fi Driver Release R8.8 Build User's Guide

---

QSPI (SPI flash)

Part.	NSS	SCK	D0	D1	D2	D3.
Zynq PS	MIO 1	MIO 6	MIO 2	MIO 3	MIO 4	MIO 5

Device tree

Add the following entry:

&qspi {
    // QSPI
    status = "okay";
    is-dual = <0>;
    num-cs = <1>;
    xlnx,qspi-mode = <1>;

    flash@0 {
        #address-cells = <1>;
        #size-cells =<1>;
        compatible = "jedec,spi-nor";
        reg = <0>;
        spi-max-frequency = <50000000>;
        m25p,fast-read;
    };
};

---

SPI (platform controller/STM32)

Part.	NSS	CLK	MISO	MOSI
Zynq PS	MIO 49	MIO 48	MIO 47	MIO 46
STM32	PB12	PB13	PB14	PB15

Add the following entry:

&spi1 {
    status = "okay";
    num-cs = <1>;
    is-decoded-cs = <0>;
    #address-cells = <1>;
    #size-cells = <0>;

    dev@0 {
        compatible = "linux,spidev";
        reg = <0>;
        spi-max-frequency = <1000000>;
    };
};

---

Bluetooth

• Bluetooth cannot be used from PS/Linux