DESK-MX6UL-L/Peripherals/LCD
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| 2023/05/04 | DESK-MX6UL-L 4.0.0 release | ||
Contents
Peripheral LCD[edit | edit source]
Device tree configuration[edit | edit source]
AXEL ULite SOM[edit | edit source]
Here below an example of device tree configuration used on standard DAVE's kit for the AXEL ULite SOM:
From the imx6ul-axelulite-cb003a.dts where RGB interface has been configured for a LCD panel (800x480 18bit):
&lcdif {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_lcdif_dat
&pinctrl_lcdif_ctrl>;
display = <&display0>;
status = "okay";
display0: display {
bits-per-pixel = <18>;
bus-width = <18>;
display-timings {
native-mode = <&timing0>;
timing0: timing0 {
clock-frequency = <33800000>;
hactive = <800>;
vactive = <480>;
hfront-porch = <118>;
hback-porch = <10>;
hsync-len = <128>;
vback-porch = <8>;
vfront-porch = <35>;
vsync-len = <2>;
hsync-active = <0>;
vsync-active = <0>;
de-active = <1>;
pixelclk-active = <1>;
};
};
};
};
&iomuxc {
...
...
lcd {
pinctrl_lcdif_dat: lcdifdatgrp {
fsl,pins = <
MX6UL_PAD_LCD_DATA00__LCDIF_DATA00 0x79
MX6UL_PAD_LCD_DATA01__LCDIF_DATA01 0x79
MX6UL_PAD_LCD_DATA02__LCDIF_DATA02 0x79
MX6UL_PAD_LCD_DATA03__LCDIF_DATA03 0x79
MX6UL_PAD_LCD_DATA04__LCDIF_DATA04 0x79
MX6UL_PAD_LCD_DATA05__LCDIF_DATA05 0x79
MX6UL_PAD_LCD_DATA06__LCDIF_DATA06 0x79
MX6UL_PAD_LCD_DATA07__LCDIF_DATA07 0x79
MX6UL_PAD_LCD_DATA08__LCDIF_DATA08 0x79
MX6UL_PAD_LCD_DATA09__LCDIF_DATA09 0x79
MX6UL_PAD_LCD_DATA10__LCDIF_DATA10 0x79
MX6UL_PAD_LCD_DATA11__LCDIF_DATA11 0x79
MX6UL_PAD_LCD_DATA12__LCDIF_DATA12 0x79
MX6UL_PAD_LCD_DATA13__LCDIF_DATA13 0x79
MX6UL_PAD_LCD_DATA14__LCDIF_DATA14 0x79
MX6UL_PAD_LCD_DATA15__LCDIF_DATA15 0x79
MX6UL_PAD_LCD_DATA16__LCDIF_DATA16 0x79
MX6UL_PAD_LCD_DATA17__LCDIF_DATA17 0x79
>;
};
pinctrl_lcdif_ctrl: lcdifctrlgrp {
fsl,pins = <
MX6UL_PAD_LCD_CLK__LCDIF_CLK 0x79
MX6UL_PAD_LCD_ENABLE__LCDIF_ENABLE 0x79
MX6UL_PAD_LCD_DATA20__GPIO3_IO25 0x110b0 /* 5V_BL_EN */
MX6UL_PAD_LCD_DATA19__GPIO3_IO24 0x110b0 /* 3V3_LCD_EN */
MX6UL_PAD_GPIO1_IO01__GPIO1_IO01 0x110b0 /* BLEN */
MX6UL_PAD_LCD_DATA22__GPIO3_IO27 0x110b0 /* LVDS_STDN */
>;
};
};
...
...
};
Accessing the peripheral in AXEL ULite SOM[edit | edit source]
Linux messages at boot time[edit | edit source]
... ... [ 1.910526] mxsfb 21c8000.lcdif: supply lcd not found, using dummy regulator [ 2.339524] mxsfb 21c8000.lcdif: initialized ... ...
Additional information[edit | edit source]
LCD framebuffer can be accessed through the standard /dev/fbX fb device.
The configured framebuffer can be checked using standard fbset utility:
root@desk-mx6ul-axelulite:~# fbset
mode "800x480-61"
# D: 33.801 MHz, H: 32.008 kHz, V: 60.968 Hz
geometry 800 480 800 480 32
timings 29585 10 118 8 35 128 2
accel false
rgba 8/16,8/8,8/0,0/0
endmode
