[PATCH] ARM: dts: imx7d-pico-pi: add OV5645 camera support

[PATCH] ARM: dts: imx7d-pico-pi: add OV5645 camera support

[Lech Perczak]

Add OV5645 camera device node and enable relevant components in the
video capture data path, so output stream can be captured, and the
camera itself can be controlled over I²C bus.

This is roughly based on descriptions found in downstream kernel tree [1],
adapted to match upstream bindings.

The camera can probe successfully and establish an image path through
MIPI-CSI and CSI peripherals, but so far I wasn't able to transfer the
actual image, probably due to pixel format incompatibilities between
the camera and CSI peripheral drivers - yet I'm hoping, that submitting
this will eventually help getting full support.

Link: https://github.com/technexion-android/kernel_imx/blob/ce8fd74abf518dac0a09e8dcb37f3496f6375124/arch/arm/boot/dts/imx7d-pico.dtsi#L874 [1]

Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
---
 arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts | 60 +++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts b/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
index 62221131336f..b36936ecfa4b 100644
--- a/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
@@ -59,6 +59,33 @@ polytouch: touchscreen@38 {
 		touchscreen-size-x = <800>;
 		touchscreen-size-y = <480>;
 	};
+
+	camera@3c {
+		compatible = "ovti,ov5645";
+		reg = <0x3c>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_camera>;
+
+		clocks = <&clks IMX7D_CLKO1_ROOT_DIV>;
+		assigned-clocks = <&clks IMX7D_CLKO1_ROOT_DIV>;
+		assigned-clock-rates = <24000000>;
+
+		enable-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&gpio1 5 GPIO_ACTIVE_LOW>;
+
+		vdda-supply = <&reg_2p5v>;
+		vdddo-supply = <&reg_vref_1v8>;
+		vddd-supply = <&reg_vref_1v8>;
+
+		port {
+			ov5645_to_mipi_csi2: endpoint {
+				remote-endpoint = <&mipi_csi2_in>;
+				clock-lanes = <0>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
 };
 
 &usdhc1 {
@@ -93,5 +120,38 @@ MX7D_PAD_EPDC_DATA04__GPIO2_IO4		0x14
 			MX7D_PAD_EPDC_DATA13__GPIO2_IO13	0x14
 		>;
 	};
+};
+
+&iomuxc_lpsr {
+	pinctrl_camera: cameragrp {
+		fsl,pins = <
+			MX7D_PAD_LPSR_GPIO1_IO04__GPIO1_IO4	0x15
+			MX7D_PAD_LPSR_GPIO1_IO05__GPIO1_IO5	0x15
+			MX7D_PAD_LPSR_GPIO1_IO02__CCM_CLKO1	0x7d
+		>;
+	};
+};
+
+&csi {
+	status = "okay";
+};
+
+&mipi_csi {
+	status = "okay";
+	clock-frequency = <24000000>;
+
+	ports {
+		port@0 {
+			reg = <0>;
+
+			mipi_csi2_in: endpoint {
+				remote-endpoint = <&ov5645_to_mipi_csi2>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
+};
 
+&video_mux {
+	status = "okay";
 };

base-commit: 79bd2dded182b1d458b18e62684b7f82ffc682e5
-- 
2.47.3

Re: [PATCH] ARM: dts: imx7d-pico-pi: add OV5645 camera support

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Medium] Incorrect `clock-frequency` assignment in the `&mipi_csi` node drastically reduces the MIPI CSI wrapper clock, causing image capture failures.
--

commit aa98f4a3e7fa5b72ccc19a9fd456c518fe7ea6ff
Author: Lech Perczak <lech.perczak@gmail.com>

ARM: dts: imx7d-pico-pi: add OV5645 camera support

This commit adds the OV5645 camera device node and enables the relevant
components in the video capture data path for the imx7d-pico-pi. The
author noted that the camera probes successfully but image transfer fails,
suspecting pixel format incompatibilities.

Link: https://github.com/technexion-android/kernel_imx/blob/ce8fd74abf518dac0a09e8dcb37f3496f6375124/arch/arm/boot/dts/imx7d-pico.dtsi#L874 [1]

> diff --git a/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts b/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
> index 62221131336f1..b36936ecfa4ba 100644
> --- a/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
> +++ b/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
[ ... ]
> @@ -93,5 +120,38 @@ MX7D_PAD_EPDC_DATA04__GPIO2_IO4		0x14
[ ... ]
> +&mipi_csi {
> +	status = "okay";
> +	clock-frequency = <24000000>;

[Severity: Medium]
Could this clock-frequency assignment be the cause of the image capture
failures mentioned in the commit message?

According to the nxp,imx-mipi-csi2.yaml binding schema and the
imx-mipi-csis.c driver, this deprecated property overrides the MIPI CSI-2
receiver's internal wrap clock.

By forcing this clock to 24 MHz, it drastically underclocks the peripheral
from its default of 166 MHz. This renders it too slow to process incoming
high-speed MIPI CSI-2 data. 

Removing this property should allow the peripheral to use its proper
high-speed default clock.

> +
> +	ports {
> +		port@0 {
[ ... ]

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260524175312.10952-1-lech.perczak@gmail.com?part=1

[PATCH v2] ARM: dts: imx7d-pico-pi: add OV5645 camera support

[Lech Perczak]

Add OV5645 camera device node and enable relevant components in the
video capture data path, so output stream can be captured, and the
camera itself can be controlled over I²C bus.

This is roughly based on descriptions found in downstream kernel tree [1],
adapted to match upstream bindings.

The camera can probe successfully and establish an image path through
MIPI-CSIS and CSI peripherals, and capture the picture at 1280x960px
resolution, or even more, although i.MX7D is a bit underpowered to
stream this uncompressed.

Link: https://github.com/technexion-android/kernel_imx/blob/ce8fd74abf518dac0a09e8dcb37f3496f6375124/arch/arm/boot/dts/imx7d-pico.dtsi#L874 [1]

Signed-off-by: Lech Perczak <lech.perczak@gmail.com>

---

v2:
- Confirmed the video capture is actually possible with this setup.
  24MHz wrap clock actually works.
- Updated MIPI wrap clock to use assigned-clocks binding.

 arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts | 61 +++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts b/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
index 62221131336f..6a6c3c743b41 100644
--- a/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
@@ -59,6 +59,33 @@ polytouch: touchscreen@38 {
 		touchscreen-size-x = <800>;
 		touchscreen-size-y = <480>;
 	};
+
+	camera@3c {
+		compatible = "ovti,ov5645";
+		reg = <0x3c>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_camera>;
+
+		clocks = <&clks IMX7D_CLKO1_ROOT_DIV>;
+		assigned-clocks = <&clks IMX7D_CLKO1_ROOT_DIV>;
+		assigned-clock-rates = <24000000>;
+
+		enable-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&gpio1 5 GPIO_ACTIVE_LOW>;
+
+		vdda-supply = <&reg_2p5v>;
+		vdddo-supply = <&reg_vref_1v8>;
+		vddd-supply = <&reg_vref_1v8>;
+
+		port {
+			ov5645_to_mipi_csi2: endpoint {
+				remote-endpoint = <&mipi_csi2_in>;
+				clock-lanes = <0>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
 };
 
 &usdhc1 {
@@ -93,5 +120,39 @@ MX7D_PAD_EPDC_DATA04__GPIO2_IO4		0x14
 			MX7D_PAD_EPDC_DATA13__GPIO2_IO13	0x14
 		>;
 	};
+};
+
+&iomuxc_lpsr {
+	pinctrl_camera: cameragrp {
+		fsl,pins = <
+			MX7D_PAD_LPSR_GPIO1_IO04__GPIO1_IO4	0x15
+			MX7D_PAD_LPSR_GPIO1_IO05__GPIO1_IO5	0x15
+			MX7D_PAD_LPSR_GPIO1_IO02__CCM_CLKO1	0x7d
+		>;
+	};
+};
+
+&csi {
+	status = "okay";
+};
+
+&mipi_csi {
+	status = "okay";
+	assigned-clocks = <&clks IMX7D_MIPI_CSI_ROOT_CLK>;
+	assigned-clock-rates = <24000000>;
+
+	ports {
+		port@0 {
+			reg = <0>;
+
+			mipi_csi2_in: endpoint {
+				remote-endpoint = <&ov5645_to_mipi_csi2>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
+};
 
+&video_mux {
+	status = "okay";
 };

base-commit: 79bd2dded182b1d458b18e62684b7f82ffc682e5
-- 
2.47.3

Re: [PATCH v2] ARM: dts: imx7d-pico-pi: add OV5645 camera support

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 2 potential issue(s) to consider:
- [Critical] The OV5645 digital core voltage (`vddd-supply`) is mapped to a 1.8V regulator, violating the sensor's maximum voltage rating.
- [High] The MIPI CSI core wrap clock is severely underclocked to 24MHz, causing performance bottlenecks and dropped frames.
--

commit dd6924fa219eeb7e7a60387b7bc6b921c2ef8a7b
Author: Lech Perczak <lech.perczak@gmail.com>

ARM: dts: imx7d-pico-pi: add OV5645 camera support

Add OV5645 camera device node and enable relevant components in the video
capture data path. It establishes an image path through MIPI-CSIS and CSI
peripherals to capture pictures at 1280x960px resolution.

Link: https://github.com/technexion-android/kernel_imx/blob/ce8fd74abf518dac0a09e8dcb37f3496f6375124/arch/arm/boot/dts/imx7d-pico.dtsi#L874 [1]

> diff --git a/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts b/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
> index 62221131336f1..6a6c3c743b41b 100644
> --- a/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
> +++ b/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
> @@ -59,6 +59,33 @@ polytouch: touchscreen@38 {
>  		touchscreen-size-x = <800>;
>  		touchscreen-size-y = <480>;
>  	};
> +
> +	camera@3c {
> +		compatible = "ovti,ov5645";
> +		reg = <0x3c>;
> +
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_camera>;
> +
> +		clocks = <&clks IMX7D_CLKO1_ROOT_DIV>;
> +		assigned-clocks = <&clks IMX7D_CLKO1_ROOT_DIV>;
> +		assigned-clock-rates = <24000000>;
> +
> +		enable-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
> +		reset-gpios = <&gpio1 5 GPIO_ACTIVE_LOW>;
> +
> +		vdda-supply = <&reg_2p5v>;
> +		vdddo-supply = <&reg_vref_1v8>;
> +		vddd-supply = <&reg_vref_1v8>;

[Severity: Critical]
Is the vddd-supply voltage correct here?

According to the ovti,ov5645.yaml bindings and hardware specifications, the
digital core voltage (vddd-supply) should strictly be 1.5V.

Connecting this to a 1.8V regulator appears to subject the sensor to an
overvoltage condition that exceeds its maximum ratings, which might lead to
overheating or hardware damage.

> +
> +		port {
> +			ov5645_to_mipi_csi2: endpoint {
> +				remote-endpoint = <&mipi_csi2_in>;
> +				clock-lanes = <0>;
> +				data-lanes = <1 2>;
> +			};
> +		};
> +	};
>  };
>  
[ ... ]
> +&mipi_csi {
> +	status = "okay";
> +	assigned-clocks = <&clks IMX7D_MIPI_CSI_ROOT_CLK>;
> +	assigned-clock-rates = <24000000>;

[Severity: High]
Could this be the cause of the performance bottleneck mentioned in the
commit message?

The nxp,imx-mipi-csi2.yaml bindings indicate that the CSI core wrap clock
should be configured to 166MHz (<166000000>).

Setting it to 24MHz limits the processing bandwidth to ~24 Mpixels/sec,
which seems insufficient for streaming uncompressed 1280x960 video. Setting
the clock to 166MHz might resolve the underpowered streaming performance.

> +
> +	ports {
> +		port@0 {
> +			reg = <0>;
> +
> +			mipi_csi2_in: endpoint {
> +				remote-endpoint = <&ov5645_to_mipi_csi2>;
> +				data-lanes = <1 2>;
> +			};
> +		};
> +	};
> +};

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260527005213.6019-1-lech.perczak@gmail.com?part=1

[PATCH v3] ARM: dts: imx7d-pico-pi: add OV5645 camera support

[Lech Perczak]

Add OV5645 camera device node and enable relevant components in the
video capture data path, so output stream can be captured, and the
camera itself can be controlled over I²C bus.

This is roughly based on descriptions found in downstream kernel tree [1],
adapted to match upstream bindings.

The camera can probe successfully and establish an image path through
MIPI-CSIS and CSI peripherals, and capture the picture at 1280x960px
resolution, or even more, although i.MX7D is a bit underpowered to
stream this uncompressed.

Link: https://github.com/technexion-android/kernel_imx/blob/ce8fd74abf518dac0a09e8dcb37f3496f6375124/arch/arm/boot/dts/imx7d-pico.dtsi#L874 [1]

Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
---

v3:
- drop the CSI wrap clock override - it is unnecessary to alter it,
  camera can work just with default 166MHz set there.
  While testing v2, I actually had it set at 144MHz by accident.
- Add explicit 1.5V regulator-fixed for the cameras vddd-supply,
  instead of previous 1.8V fixed regulator. This doesn't affect
  camera operation -  I can only assume the hardware provides correct
  voltage anyway, as I don't have the device schematics.

v2:
- Confirmed the video capture is actually possible with this setup.
  24MHz wrap clock actually works.
- Updated MIPI wrap clock to use assigned-clocks binding.

 arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts | 67 +++++++++++++++++++++
 1 file changed, 67 insertions(+)

diff --git a/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts b/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
index 62221131336f..8982575d3219 100644
--- a/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
@@ -19,6 +19,14 @@ led {
 		};
 	};
 
+	reg_1p5v: regulator-1p5v {
+		compatible = "regulator-fixed";
+		regulator-name = "1P5V";
+		regulator-min-microvolt = <1500000>;
+		regulator-max-microvolt = <1500000>;
+		regulator-always-on;
+	};
+
 	sound {
 		compatible = "simple-audio-card";
 		simple-audio-card,name = "imx7-sgtl5000";
@@ -59,6 +67,33 @@ polytouch: touchscreen@38 {
 		touchscreen-size-x = <800>;
 		touchscreen-size-y = <480>;
 	};
+
+	camera@3c {
+		compatible = "ovti,ov5645";
+		reg = <0x3c>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_camera>;
+
+		clocks = <&clks IMX7D_CLKO1_ROOT_DIV>;
+		assigned-clocks = <&clks IMX7D_CLKO1_ROOT_DIV>;
+		assigned-clock-rates = <24000000>;
+
+		enable-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&gpio1 5 GPIO_ACTIVE_LOW>;
+
+		vdda-supply = <&reg_2p5v>;
+		vdddo-supply = <&reg_vref_1v8>;
+		vddd-supply = <&reg_1p5v>;
+
+		port {
+			ov5645_to_mipi_csi2: endpoint {
+				remote-endpoint = <&mipi_csi2_in>;
+				clock-lanes = <0>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
 };
 
 &usdhc1 {
@@ -93,5 +128,37 @@ MX7D_PAD_EPDC_DATA04__GPIO2_IO4		0x14
 			MX7D_PAD_EPDC_DATA13__GPIO2_IO13	0x14
 		>;
 	};
+};
+
+&iomuxc_lpsr {
+	pinctrl_camera: cameragrp {
+		fsl,pins = <
+			MX7D_PAD_LPSR_GPIO1_IO04__GPIO1_IO4	0x15
+			MX7D_PAD_LPSR_GPIO1_IO05__GPIO1_IO5	0x15
+			MX7D_PAD_LPSR_GPIO1_IO02__CCM_CLKO1	0x7d
+		>;
+	};
+};
+
+&csi {
+	status = "okay";
+};
+
+&mipi_csi {
+	status = "okay";
+
+	ports {
+		port@0 {
+			reg = <0>;
+
+			mipi_csi2_in: endpoint {
+				remote-endpoint = <&ov5645_to_mipi_csi2>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
+};
 
+&video_mux {
+	status = "okay";
 };

base-commit: 79bd2dded182b1d458b18e62684b7f82ffc682e5
-- 
2.47.3

Re: [PATCH v3] ARM: dts: imx7d-pico-pi: add OV5645 camera support

[Frank.Li]

From: Frank Li <Frank.Li@nxp.com>


On Wed, 27 May 2026 12:19:12 +0200, Lech Perczak wrote:
> Add OV5645 camera device node and enable relevant components in the
> video capture data path, so output stream can be captured, and the
> camera itself can be controlled over I²C bus.
>
> This is roughly based on descriptions found in downstream kernel tree [1],
> adapted to match upstream bindings.
>
> [...]

Applied, thanks!

[1/1] ARM: dts: imx7d-pico-pi: add OV5645 camera support
      commit: ddcc0ca8809b4fe5b80510f611eedcc0679abe5a

Remove always-on for regulor and truncate commit message by remote testing
part.

Best regards,
--
Frank Li <Frank.Li@nxp.com>