Re: Adding LCD display (none lvds) in Linux 5.4 fslc?


Philippe Schenker
 

On Thu, 2020-08-13 at 03:28 -0700, Wouter Vanhauwaert wrote:
How do you correctly put a parallel lcd display in linux 5.4?
Uptill 4.9, there was a mxc_lcdif.c, but seems to be missing now?
In the devicetree, you used to add a node which had
compatible="fsl,lcd", addressing the pinctrl etc
But none of these seem to exist now?
I see a commit
https://github.com/Freescale/linux-fslc/commit/afcde9250592b07f165e2f66217726e26ac54e7c
This is supposed to add the lcdif, but hasn't or principle has
changed? Can someone explain?

Yes this has completely changed, look at NXP's MEK devicetrees to figure that out, at least I was once able to figure it out like that.
On Colibri-iMX8X I once had it running with something like this:

&dpu_disp1_lcdif {
remote-endpoint = <&lcd_display_in>;
status = "okay";
};


This points to:

panel {
compatible = "logictechno,lt161010-2nhc";
backlight = <&backlight>;
status = "okay";

port {
lcd_panel_in: endpoint {
remote-endpoint = <&lcd_display_out>;
};
};
};

display@disp1 {
compatible = "fsl,imx-lcdif-mux-display";
#address-cells = <1>;
#size-cells = <0>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_lcdif>;
clocks = <&clk IMX_SC_R_LCD_0 IMX_SC_PM_CLK_BYPASS>,
<&clk IMX_SC_R_LCD_0 IMX_SC_PM_CLK_MISC0>;
clock-names = "bypass_div", "pixel";
assigned-clocks = <&clk IMX_SC_R_LCD_0 IMX_SC_PM_CLK_MISC0>;
assigned-clock-parents = <&clk IMX_SC_R_LCD_0
IMX_SC_PM_CLK_BYPASS>;
fsl,lcdif-mux-regs = <&lcdif_mux_regs>;
fsl,interface-pix-fmt = "bgr666";
power-domains = <&pd IMX_SC_R_LCD_0>;
status = "okay";

port@0 {
reg = <0>;

lcd_display_in: endpoint {
remote-endpoint = <&dpu_disp1_lcdif>;
};
};

port@1 {
reg = <1>;

lcd_display_out: endpoint {
remote-endpoint = <&lcd_panel_in>;
};
};
};

Hope this helps,
Philippe

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