DESK-MX8M-L/Peripherals/WiFI
< DESK-MX8M-L
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| 2024/04/08 | DESK-MX8M-L-4.1.0 release | ||
Contents
Peripheral WiFi[edit | edit source]
Device tree configuration[edit | edit source]
Here below an example of device tree configuration used on standard DAVE's kit for the MITO 8M Mini:
From imx8mm-mito8mmini.dts:
...
...
pcie0_refclk: pcie0-refclk {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <100000000>;
};
...
...
regulators {
...
reg_pcie_pwr: pcie_pwr {
compatible = "regulator-fixed";
regulator-name = "PCIe_PWREN";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-always-on;
gpio = <&gpio2 20 GPIO_ACTIVE_HIGH>;
enable-active-high;
};
...
...
&pcie0 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pcie0>;
disable-gpio = <&gpio5 20 GPIO_ACTIVE_LOW>;
reset-gpio = <&gpio5 21 GPIO_ACTIVE_LOW>;
wake-gpio = <&gpio3 20 GPIO_ACTIVE_HIGH>;
clocks = <&clk IMX8MM_CLK_PCIE1_ROOT>,
<&clk IMX8MM_CLK_PCIE1_AUX>,
<&clk IMX8MM_CLK_PCIE1_PHY>,
<&pcie0_refclk>;
clock-names = "pcie", "pcie_aux", "pcie_phy", "pcie_bus";
assigned-clocks = <&clk IMX8MM_CLK_PCIE1_AUX>,
<&clk IMX8MM_CLK_PCIE1_PHY>,
<&clk IMX8MM_CLK_PCIE1_CTRL>;
assigned-clock-rates = <10000000>, <100000000>, <250000000>;
assigned-clock-parents = <&clk IMX8MM_SYS_PLL2_50M>,
<&clk IMX8MM_SYS_PLL2_100M>,
<&clk IMX8MM_SYS_PLL2_250M>;
ext_osc = <0>;
status = "okay";
};
...
...
&iomuxc {
...
...
pinctrl_pcie0: pcie0grp {
fsl,pins = <
MX8MM_IOMUXC_I2C4_SCL_GPIO5_IO20 0x19
MX8MM_IOMUXC_I2C4_SDA_GPIO5_IO21 0x19
MX8MM_IOMUXC_SD2_WP_GPIO2_IO20 0x19
MX8MM_IOMUXC_SAI5_RXC_GPIO3_IO20 0x19
>;
};
...
...
Accessing the peripheral[edit | edit source]
Linux messages at boot time[edit | edit source]
PCIe driver initialized:
... ... [ 1.131579] ehci-pci: EHCI PCI platform driver [ 1.147680] ohci-pci: OHCI PCI platform driver [ 3.234024] imx6q-pcie 33800000.pcie: supply epdev_on not found, using dummy regulator [ 3.242348] imx6q-pcie 33800000.pcie: PLL REF_CLK is used!. [ 3.276463] imx6q-pcie 33800000.pcie: PCIe PLL is locked. [ 3.284714] imx6q-pcie 33800000.pcie: iATU unroll: enabled [ 3.295015] imx6q-pcie 33800000.pcie: Detected iATU regions: 4 outbound, 4 inbound [ 3.309648] imx6q-pcie 33800000.pcie: host bridge /soc@0/pcie@33800000 ranges: [ 3.316925] imx6q-pcie 33800000.pcie: IO 0x001ff80000..0x001ff8ffff -> 0x0000000000 [ 3.330476] imx6q-pcie 33800000.pcie: MEM 0x0018000000..0x001fefffff -> 0x0018000000 [ 3.342505] imx6q-pcie 33800000.pcie: iATU unroll: enabled [ 3.351821] imx6q-pcie 33800000.pcie: Detected iATU regions: 4 outbound, 4 inbound [ 3.444200] imx6q-pcie 33800000.pcie: Link up ... ...
Check which are the devices connected to the PCIe.
root@desk-mx8mm:~# lspci 00:00.0 PCI bridge: Synopsys, Inc. DWC_usb3 / PCIe bridge (rev 01) 01:00.0 Network controller: Intel Corporation Wireless 7260 (rev bb) root@desk-mx8mm:~#
