DESK-MX8M-L/Peripherals/HDMI
< DESK-MX8M-L
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| 1.0.0 | Jan 2022 | First DESK-MX8M release | |
Contents
Peripheral HDMI[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 ORCA SOM:
From imx8mp-mito8mplus-cb1001.dts:
sound-hdmi {
compatible = "fsl,imx-audio-cdnhdmi";
model = "audio-hdmi";
audio-cpu = <&aud2htx>;
hdmi-out;
constraint-rate = <44100>,
<88200>,
<176400>,
<32000>,
<48000>,
<96000>,
<192000>;
status = "okay";
};
...
...
&irqsteer_hdmi {
status = "okay";
};
&hdmimix_clk {
status = "okay";
};
&hdmimix_reset {
status = "okay";
};
&hdmi_pavi {
status = "okay";
};
&hdmi {
status = "okay";
};
&hdmiphy {
status = "okay";
};
From imx8mp-mito8mplus.dtsi:
&iomuxc {
...
...
pinctrl_hog: hoggrp {
fsl,pins = <
MX8MP_IOMUXC_HDMI_DDC_SCL__HDMIMIX_HDMI_SCL 0x400001c3
MX8MP_IOMUXC_HDMI_DDC_SDA__HDMIMIX_HDMI_SDA 0x400001c3
MX8MP_IOMUXC_HDMI_HPD__HDMIMIX_HDMI_HPD 0x40000019
MX8MP_IOMUXC_HDMI_CEC__HDMIMIX_HDMI_CEC 0x40000019
>;
};
...
...
};
Accessing the peripheral[edit | edit source]
Linux messages at boot time[edit | edit source]
... ... [ 2.358974] 20e0000.hdmi_video supply HDMI not found, using dummy regulator ... ... [ 2.818470] mxc_hdmi 20e0000.hdmi_video: Detected HDMI controller 0x13:0x1a:0xa0:0xc1 ... ... [ 2.831348] mxc_sdc_fb fb@2: registered mxc display driver hdmi...
Additional information[edit | edit source]
HDMI framebuffer can be accessed through the standard /dev/fbX fb device.
The configured framebuffer can be checked using standard fbset utility:
root@desk-mx8mp:~# fbset -fb /dev/fb2 root@desk-mx8mp:~#
