Difference between revisions of "DESK-MX8M-L/Peripherals/WiFI"

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!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Notes
 
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |2024/04/08
 
| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |DESK-MX8M-L-4.1.0 release
 
| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |DESK-MX8M-L-4.1.0 release
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Line 20: Line 17:
 
=== Device tree configuration ===
 
=== Device tree configuration ===
  
−
==== ORCA SOM ====
+
Here below an example of device tree configuration used on standard DAVE's kit for the MITO 8M Mini:
−
 
 
−
Here below an example of device tree configuration used on standard DAVE's kit for the ORCA SOM:
 
  
−
From <code>imx8mp-mito8mplus-cb1001.dts</code>:
+
From <code>imx8mm-mito8mmini.dts</code>:
  
 
<pre>
 
<pre>
−
/* DWS */
+
...
−
&usdhc1 {
+
...
 +
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-names = "default";
−
pinctrl-0 = <&pinctrl_usdhc1>;
+
pinctrl-0 = <&pinctrl_pcie0>;
−
vmmc-supply = <&reg_wlan_en>;
+
disable-gpio = <&gpio5 20 GPIO_ACTIVE_LOW>;
−
bus-width = <4>;
+
reset-gpio = <&gpio5 21 GPIO_ACTIVE_LOW>;
−
non-removable;
+
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";
 
status = "okay";
 
};
 
};
−
</pre>
+
...
−
 
+
...
−
and from <code>imx8mp-mito8mplus.dtsi</code>:
+
&iomuxc {
−
 
+
...
−
<pre>
+
...
−
pinctrl_usdhc1: usdhc1grp {
+
pinctrl_pcie0: pcie0grp {
 
fsl,pins = <
 
fsl,pins = <
−
MX8MP_IOMUXC_SD1_CLK__USDHC1_CLK 0x190
+
MX8MM_IOMUXC_I2C4_SCL_GPIO5_IO20   0x19
−
MX8MP_IOMUXC_SD1_CMD__USDHC1_CMD 0x1d0
+
MX8MM_IOMUXC_I2C4_SDA_GPIO5_IO21   0x19
−
MX8MP_IOMUXC_SD1_DATA0__USDHC1_DATA0 0x1d0
+
MX8MM_IOMUXC_SD2_WP_GPIO2_IO20   0x19
−
MX8MP_IOMUXC_SD1_DATA1__USDHC1_DATA1 0x1d0
+
MX8MM_IOMUXC_SAI5_RXC_GPIO3_IO20 0x19
−
MX8MP_IOMUXC_SD1_DATA2__USDHC1_DATA2 0x1d0
 
−
MX8MP_IOMUXC_SD1_DATA3__USDHC1_DATA3 0x1d0
 
 
>;
 
>;
 
};
 
};
−
</pre>
 
−
 
−
==== MITO 8M Mini  ====
 
−
 
−
For device-tree configuration, please take a look to [[DESK-MX8M-L/Peripherals/PCI_express | PCIe]] page for DESK-MX8M-L
 
−
 
−
===Accessing the peripheral SBC ORCA===
 
−
 
−
====Linux messages at boot time====
 
−
<pre class="workstation-terminal">
 
−
[    8.307124] [TELIT] Using WE866C6 board data.
 
−
[    8.374212] ol_download_firmware: chip_id:0x5020001 board_id:0x0
 
−
[    8.374448] __ol_transfer_bin_file: Failed to get bdwlan30_c6.b00:-2
 
−
[    8.374455] __ol_transfer_bin_file: Trying to load default bdwlan30_c6.bin
 
−
[    8.376904] Board extended Data download address: 0x0
 
−
[    8.394418] __ol_transfer_bin_file: Loading setup file qsetup30.bin
 
−
[    8.394497] __ol_transfer_bin_file: Failed to get qsetup30.bin:-2
 
−
[    9.008083] R0: wlan: [244:E :SAP] dfs_init_radar_filters[217]: Unknown dfs domain 0
 
−
[    9.023752] Target Ready! : transmit resources : 3 size:1792, MaxMsgsPerHTCBundle = 32
 
−
[    9.111014] target uses HTT version 3.60; host uses 3.28
 
−
[    9.112979] DEBUGFS PEER MAC = 0x2:0x21:0x7e:0x2:0x47:0xe7
 
−
[    9.116337] *** Warning: host/target HTT versions are different, though compatible!
 
−
[    9.133715] Host SW:4.5.25.46, FW:0.0.0.111, HW:QCA93x7_REV1_1
 
−
[    9.140159] ENTER sme_set_btc_coex_dutycycle = 30
 
−
[    9.140170] ENTER sme_set_btc_coex_dutycycle =30
 
−
[    9.145422] ath_hif_sdio: HIF (Atheros/multi-bss)
 
−
[    9.154899] wlan: driver loaded in 1060000
 
−
</pre>
 
−
 
−
====Enable the interface and check status====
 
−
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mp:~# rfkill list
 
−
0: phy0: Wireless LAN
 
−
        Soft blocked: yes
 
−
        Hard blocked: no
 
−
root@desk-mx8mp:~# rfkill unblock 0
 
−
root@desk-mx8mp:~# ifconfig wlan0 up
 
−
root@desk-mx8mp:~# ifconfig wlan0
 
−
wlan0: flags=4098<BROADCAST,MULTICAST>  mtu 1500
 
−
        ether 00:21:7e:81:47:e7  txqueuelen 3000  (Ethernet)
 
−
        RX packets 0  bytes 0 (0.0 B)
 
−
        RX errors 0  dropped 0  overruns 0  frame 0
 
−
        TX packets 0  bytes 0 (0.0 B)
 
−
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 
−
 
−
root@desk-mx8mp:~#
 
−
</pre>
 
−
 
−
==== Usage with [https://wireless.wiki.kernel.org/en/users/documentation/iw iw] tool ====
 
−
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mp:~# iw wlan0 scan
 
−
BSS d6:21:f9:35:8e:88(on wlan0)
 
−
        last seen: 399.264s [boottime]
 
−
        TSF: 6117312270692 usec (70d, 19:15:12)
 
−
        freq: 5180
 
−
        beacon interval: 100 TUs
 
−
        capability: ESS Privacy SpectrumMgmt ShortSlotTime RadioMeasure (0x1511)
 
−
        signal: -51.00 dBm
 
−
        last seen: 0 ms ago
 
−
        Information elements from Probe Response frame:
 
−
        SSID: davesrl
 
−
        Supported rates: 6.0* 9.0 12.0* 18.0 24.0* 36.0 48.0 54.0
 
−
...
 
−
...
 
−
...
 
−
        Transmit Power Envelope:
 
−
                * Local Maximum Transmit Power For 20 MHz: 23 dBm
 
−
                * Local Maximum Transmit Power For 40 MHz: 23 dBm
 
−
                * Local Maximum Transmit Power For 80 MHz: 23 dBm
 
−
        WMM:    * Parameter version 1
 
−
                * BE: CW 15-1023, AIFSN 3
 
−
                * BK: CW 15-1023, AIFSN 7
 
−
                * VI: CW 7-15, AIFSN 2, TXOP 3008 usec
 
−
                * VO: CW 3-7, AIFSN 2, TXOP 1504 usec
 
−
root@desk-mx8mp:~#
 
−
</pre>
 
−
 
−
====Setup for DHCP connection====
 
−
 
−
Add the network configuration for <code>systemd-networkd</code>, disable the <code>connman</code> service and enable the <code>resolv.conf</code> via <code>systemd-resolved</code>:
 
−
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mp:~# cat /etc/systemd/network/21-wlan0.network
 
−
[Match]
 
−
Name=wlan0
 
−
 
−
# Prevent the interface loading if the kernel boots from nfs
 
−
KernelCommandLine=!nfsroot
 
−
 
−
[Network]
 
−
DHCP=yes
 
−
root@desk-mx8mp:~# systemctl disable connman.service
 
−
Removed /etc/systemd/system/multi-user.target.wants/connman.service.
 
 
...
 
...
 
...
 
...
−
root@desk-mx8mp:~# ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf
 
−
</pre>
 
−
 
−
Setup your <code>wpa_supplicant.conf</code> configuration file for handle WiFi connection:
 
−
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mp:~# cat /etc/wpa_supplicant.conf
 
−
ctrl_interface=/var/run/wpa_supplicant
 
−
ctrl_interface_group=0
 
−
update_config=1
 
−
 
−
network={
 
−
        ssid="daveguest"
 
−
        psk="********"
 
−
}
 
−
</pre>
 
−
 
−
Reboot the system and manually start the <code>wpa_supplicant</code> using the <code>wlan0</code> interface and the <code>wpa_supplicant.conf</code> configuration file:
 
−
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mp:~# wpa_supplicant -i wlan0 -c /etc/wpa_supplicant.conf -B
 
−
Successfully initialized wpa_supplicant
 
−
root@desk-mx8mp:~# [  132.978188] DEBUGFS PEER MAC = 0xd0:0x21:0xf9:0x35:0x8e:0x88
 
−
[  133.070518] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
 
−
 
−
root@desk-mx8mp:~#
 
 
</pre>
 
</pre>
  
−
Then the interface will be properly configured (see the IP address configured) and the network access is enabled:
+
===Accessing the peripheral ===
−
 
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mp:~# ifconfig wlan0
 
−
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
 
−
        inet 10.203.1.186  netmask 255.255.255.0  broadcast 10.203.1.255
 
−
        inet6 fe80::221:7eff:fe81:47e7  prefixlen 64  scopeid 0x20<link>
 
−
        ether 00:21:7e:81:47:e7  txqueuelen 3000  (Ethernet)
 
−
        RX packets 6  bytes 1012 (1012.0 B)
 
−
        RX errors 0  dropped 0  overruns 0  frame 0
 
−
        TX packets 22  bytes 3101 (3.0 KiB)
 
−
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 
−
 
 
−
root@desk-mx8mp:~# ping www.dave.eu
 
−
PING www.dave.eu (51.91.120.202) 56(84) bytes of data.
 
−
64 bytes from 202.ip-51-91-120.eu (51.91.120.202): icmp_seq=1 ttl=48 time=40.1 ms
 
−
64 bytes from 202.ip-51-91-120.eu (51.91.120.202): icmp_seq=2 ttl=48 time=46.8 ms
 
−
64 bytes from 202.ip-51-91-120.eu (51.91.120.202): icmp_seq=3 ttl=48 time=46.0 ms
 
−
^C
 
−
--- www.dave.eu ping statistics ---
 
−
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
 
−
rtt min/avg/max/mdev = 40.124/44.331/46.821/2.991 ms
 
−
root@desk-mx8mp:~#
 
−
</pre>
 
−
 
 
−
===Accessing the peripheral MITO 8M Mini ===
 
  
 
====Linux messages at boot time====
 
====Linux messages at boot time====
  
−
Check that AzureWave driver for PCIe was initialized:
+
PCIe driver initialized:
  
 
<pre class="workstation-terminal">
 
<pre class="workstation-terminal">
 
...
 
...
 
...                                                                                   
 
...                                                                                   
−
[    6.519674] mwifiex_pcie 0000:01:00.0: no quirks enabled
+
[    1.131579] ehci-pci: EHCI PCI platform driver
−
[    6.525230] mwifiex_pcie 0000:01:00.0: enabling device (0000 -> 0002)
+
[    1.147680] ohci-pci: OHCI PCI platform driver                                                                     
−
[    6.593357] mwifiex_pcie: PCI memory map Virt0: (____ptrval____) PCI memory map Virt2: (____ptrval____)
+
[    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!.             
−
[    7.638822] mwifiex_pcie 0000:01:00.0: info: FW download over, size 632240 bytes
+
[    3.276463] imx6q-pcie 33800000.pcie: PCIe PLL is locked.      
−
...
+
[    3.284714] imx6q-pcie 33800000.pcie: iATU unroll: enabled             
−
[    8.509865] mwifiex_pcie 0000:01:00.0: WLAN FW is active
+
[    3.295015] imx6q-pcie 33800000.pcie: Detected iATU regions: 4 outbound, 4 inbound
−
[    8.562243] mwifiex_pcie 0000:01:00.0: info: MWIFIEX VERSION: mwifiex 1.0 (16.68.1.p179)
+
[    3.309648] imx6q-pcie 33800000.pcie: host bridge /soc@0/pcie@33800000 ranges:
−
[    8.570473] mwifiex_pcie 0000:01:00.0: driver_version = mwifiex 1.0 (16.68.1.p179)
+
[    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
 
...
 
...
 
...
 
...
 
</pre>
 
</pre>
  
−
and the WiFi module is available as PCIe device:
+
Check which are the devices connected to the PCIe.
  
 
<pre class="workstation-terminal">
 
<pre class="workstation-terminal">
 
root@desk-mx8mm:~# lspci
 
root@desk-mx8mm:~# lspci
 
00:00.0 PCI bridge: Synopsys, Inc. DWC_usb3 / PCIe bridge (rev 01)
 
00:00.0 PCI bridge: Synopsys, Inc. DWC_usb3 / PCIe bridge (rev 01)
−
01:00.0 Ethernet controller: Marvell Technology Group Ltd. Device 2b42 (rev 11)
+
01:00.0 Network controller: Intel Corporation Wireless 7260 (rev bb)
−
root@desk-mx8mm:~#
 
−
</pre>
 
−
 
 
−
====Setup for static connection====
 
−
 
 
−
Check that the interface is properly intialized:
 
−
 
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mm:~# ifconfig mlan0
 
−
mlan0: flags=4098<BROADCAST,MULTICAST>  mtu 1500
 
−
        ether e8:fb:1c:e1:80:65  txqueuelen 1000  (Ethernet)
 
−
        RX packets 0  bytes 0 (0.0 B)
 
−
        RX errors 0  dropped 0  overruns 0  frame 0
 
−
        TX packets 0  bytes 0 (0.0 B)
 
−
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 
−
</pre>
 
−
 
 
−
Setup the <code>wpa_supplicant.conf</code> configuration file for handling the WiFi connection, for example:
 
−
 
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mm:~# cat /etc/wpa_supplicant.conf
 
−
network={
 
−
    ssid="ZyXEL"
 
−
    key_mgmt=NONE
 
−
}
 
−
</pre>
 
−
 
 
−
Apply the <code>wpa_supplicant.conf</code> configuration file manually starting the <code>wpa_supplicant</code>:
 
−
 
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mm:~# wpa_supplicant -i mlan0 -c /etc/wpa_supplicant.conf -B
 
−
Successfully initialized wpa_supplicant
 
−
...
 
−
root@desk-mx8mm:~#
 
−
</pre>
 
−
 
 
−
Add the <code>mlan0</code> IP address:
 
−
 
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mm:~# ip addr add 192.168.11.165/255.255.255.0 dev mlan0
 
−
</pre>
 
−
 
 
−
Then the network access is enabled:
 
−
 
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mm:~# ping 192.168.11.243 -c 4
 
−
PING 192.168.11.243 (192.168.11.243) 56(84) bytes of data.
 
−
64 bytes from 192.168.11.243: icmp_seq=1 ttl=64 time=2.93 ms
 
−
64 bytes from 192.168.11.243: icmp_seq=2 ttl=64 time=2.96 ms
 
−
64 bytes from 192.168.11.243: icmp_seq=3 ttl=64 time=1.97 ms
 
−
64 bytes from 192.168.11.243: icmp_seq=4 ttl=64 time=2.77 ms
 
−
 
 
−
--- 192.168.11.243 ping statistics ---
 
−
4 packets transmitted, 4 received, 0% packet loss, time 3005ms
 
−
rtt min/avg/max/mdev = 1.969/2.657/2.962/0.404 ms
 
−
root@desk-mx8mm:~#
 
−
</pre>
 
−
 
 
−
====Setup for DHCP connection====
 
−
 
 
−
Check that the interface is properly recognized:
 
−
 
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mm:~# ifconfig mlan0
 
−
mlan0: flags=4098<BROADCAST,MULTICAST>  mtu 1500
 
−
        ether e8:fb:1c:e1:80:65  txqueuelen 1000  (Ethernet)
 
−
        RX packets 0  bytes 0 (0.0 B)
 
−
        RX errors 0  dropped 0  overruns 0  frame 0
 
−
        TX packets 0  bytes 0 (0.0 B)
 
−
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 
−
</pre>
 
−
 
 
−
Add the network configuration for <code>systemd-networkd</code>
 
−
 
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mm:~# cat /etc/systemd/network/21-mlan0.network
 
−
[Match]
 
−
Name=mlan0
 
−
 
 
−
# Prevent the interface loading if the kernel boots from nfs
 
−
KernelCommandLine=!nfsroot
 
−
 
 
−
[Network]
 
−
DHCP=yes
 
−
</pre>
 
−
 
 
−
Setup your <code>wpa_supplicant.conf</code> configuration file for handle WiFi connection:
 
−
 
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mm:~# cat /etc/wpa_supplicant.conf
 
−
network={
 
−
        ssid="daveguest"
 
−
        psk="******"
 
−
}
 
−
</pre>
 
−
 
 
−
Reboot the system and manually start the <code>wpa_supplicant</code> using the <code>mlan0</code> interface and the <code>wpa_supplicant.conf</code> configuration file:
 
−
 
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mm:~# wpa_supplicant -i mlan0 -c /etc/wpa_supplicant.conf -B
 
−
Successfully initialized wpa_supplicant
 
−
...
 
−
[  131.877506] ieee80211 phy0: mwifiex_cfg80211_sched_scan_start : Invalid Sched_scan parameters
 
−
root@desk-mx8mm:~# [  134.728825] mwifiex_pcie 0000:01:00.0: info: trying to associate to bssid d0:21:f9:35:87:e8
 
−
[  134.754118] mwifiex_pcie 0000:01:00.0: info: associated to bssid d0:21:f9:35:87:e8 successfully
 
−
[  134.778115] IPv6: ADDRCONF(NETDEV_CHANGE): mlan0: link becomes ready
 
−
</pre>
 
−
 
 
−
Then the interface will be properly configured and the network access is enabled:
 
−
 
 
−
<pre class="workstation-terminal">
 
−
root@desk-mx8mm:~# ping www.dave.eu -c 4
 
−
PING www.dave.eu (51.91.120.202) 56(84) bytes of data.
 
−
64 bytes from 202.ip-51-91-120.eu (51.91.120.202): icmp_seq=1 ttl=48 time=332 ms
 
−
64 bytes from 202.ip-51-91-120.eu (51.91.120.202): icmp_seq=2 ttl=48 time=254 ms
 
−
64 bytes from 202.ip-51-91-120.eu (51.91.120.202): icmp_seq=3 ttl=48 time=174 ms
 
−
64 bytes from 202.ip-51-91-120.eu (51.91.120.202): icmp_seq=4 ttl=48 time=94.2 ms
 
−
 
 
−
--- www.dave.eu ping statistics ---
 
−
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
 
−
rtt min/avg/max/mdev = 94.197/213.585/332.136/88.720 ms
 
 
root@desk-mx8mm:~#
 
root@desk-mx8mm:~#
 
</pre>
 
</pre>
Line 355: Line 119:
 
=== Additional information ===
 
=== Additional information ===
  
−
* [https://wireless.wiki.kernel.org/en/users/documentation/rfkill rfkill]
+
[[Category:MITO 8M Mini]]
−
* [https://wireless.wiki.kernel.org/en/users/documentation/iw iw tool]
 
−
* [https://wireless.wiki.kernel.org/en/users/documentation/wpa_supplicant wpa_supplicant]
 
−
 
 
−
[[Category:ORCA]] [[Category:MITO 8M Mini]]
 

Revision as of 08:15, 8 April 2024

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History
Issue Date Notes
2024/04/08 DESK-MX8M-L-4.1.0 release


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:~#

Additional information[edit | edit source]

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