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overlays: Add vec-gpio-pi5-overlay

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Add an overlay to allow composite video to be output on GPIOs 4-11
on Raspberry Pi 5, 500, 500+ or CM5 only, with an optional 108 MHz
clock on GPIO 0 and duplicate MSB on GPIO 27.

Requires composite video to be enabled and DPI to be disabled.

Signed-off-by: Nick Hollinghurst <nick.hollinghurst@raspberrypi.com>
This commit is contained in:
Nick Hollinghurst
2025-10-28 14:40:01 +00:00
committed by Phil Elwell
parent 4a4ea03dc5
commit 33c90d7913
4 changed files with 67 additions and 1 deletions
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1
arch/arm/boot/dts/overlays/Makefile
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@@ -345,6 +345,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
vc4-kms-v3d-pi4.dtbo \ vc4-kms-v3d-pi4.dtbo \
vc4-kms-v3d-pi5.dtbo \ vc4-kms-v3d-pi5.dtbo \
vc4-kms-vga666.dtbo \ vc4-kms-vga666.dtbo \
vec-gpio-pi5.dtbo \
vga666.dtbo \ vga666.dtbo \
vl805.dtbo \ vl805.dtbo \
w1-gpio.dtbo \ w1-gpio.dtbo \

11
arch/arm/boot/dts/overlays/README
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@@ -5838,7 +5838,7 @@ Info: See vc4-kms-v3d-pi4 (this is the Pi 5 version)
Name: vc4-kms-vga666 Name: vc4-kms-vga666
Info: Enable the VGA666 (resistor ladder ADC) for the vc4-kms-v3d driver. Info: Enable the VGA666 (resistor ladder DAC) for the vc4-kms-v3d driver.
Requires vc4-kms-v3d to be loaded. Requires vc4-kms-v3d to be loaded.
Load: dtoverlay=vc4-kms-vga666,<param> Load: dtoverlay=vc4-kms-vga666,<param>
Params: ddc Enables GPIOs 0&1 as the I2C to read the EDID Params: ddc Enables GPIOs 0&1 as the I2C to read the EDID
@@ -5846,6 +5846,15 @@ Params: ddc Enables GPIOs 0&1 as the I2C to read the EDID
GPIOs, therefore level shifters are required. GPIOs, therefore level shifters are required.
Name: vec-gpio-pi5
Info: Overlay to output composite video as an 8-bit digital code over GPIO
pins 4-11, for Raspberry Pi 5 series only. Requires composite video
to be enabled; incompatible with any use of DPI or VGA666.
Load: dtoverlay=vec-gpio-pi5,<param>
Params: clk Enable GPIO 0 (clock, 108 MHz)
gpio27 Enable GPIO 27 (duplicate MSB)
Name: vga666 Name: vga666
Info: Overlay for the Fen Logic VGA666 board Info: Overlay for the Fen Logic VGA666 board
This uses GPIOs 2-21 (so no I2C), and activates the output 2-3 seconds This uses GPIOs 2-21 (so no I2C), and activates the output 2-3 seconds

8
arch/arm/boot/dts/overlays/overlay_map.dts
View File

@@ -518,6 +518,14 @@
bcm2712; bcm2712;
}; };
vec-gpio {
bcm2712 = "vec-gpio-pi5";
};
vec-gpio-pi5 {
bcm2712;
};
vl805 { vl805 {
bcm2711; bcm2711;
}; };

48
arch/arm/boot/dts/overlays/vec-gpio-pi5-overlay.dts Normal file
View File

@@ -0,0 +1,48 @@
/*
* vec-gpio-pi5-overlay.dts
*/
/dts-v1/;
/plugin/;
/{
compatible = "brcm,bcm2712";
fragment@0 {
target = <&rp1_vec>;
rp1vec_overlay: __overlay__ {
pinctrl-names = "default";
pinctrl-0 = <&rp1vec_ch0pins>, <&rp1vec_ch0pins>;
};
};
fragment@1 {
target = <&gpio>;
__overlay__ {
rp1vec_ch0pins: rp1vec_ch0pins {
function = "dpi";
pins = "gpio4", "gpio5", "gpio6", "gpio7",
"gpio8", "gpio9", "gpio10", "gpio11";
bias-disable;
drive-strength = <12>;
};
rp1vec_pin27: rp1vec_pin27 {
function = "dpi";
pins = "gpio27";
bias-disable;
drive-strength = <12>;
};
rp1vec_clkpin: rp1vec_clkpin {
function = "dpi";
pins = "gpio0";
bias-disable;
drive-strength = <12>;
};
};
};
__overrides__ {
gpio27 = <&rp1vec_overlay>, "pinctrl-0:4=", <&rp1vec_pin27>;
clk = <&rp1vec_overlay>, "pinctrl-0:8=", <&rp1vec_clkpin>;
};
};