Display bridges hardware components

Applicable for

STM32MP13x lines, STM32MP15x lines

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1. Article purpose

The purpose of this article is to:

• List the display bridge hardware components that might be integrated in the different boards.
• Link these components to the corresponding software framework(s).
• Point to the appropriate component datasheets.
• Explain, when necessary, how to configure these components.

2. Software frameworks

Domain	Peripheral	Software components			Comment
		OP-TEE	Linux	STM32Cube
Visual	Analog Devices adv7533		DRM/KMS framework		DSI to HDMI transmitter
Visual	Silab sil9022		DRM/KMS framework		HDMI transmitter
Visual	Toshiba tc358762		DRM/KMS framework		DSI to DPI

3. Analog Devices adv7533

The adv7533 DSI to HDMI transmitter supports the HDMI^® Specification on a wide range of mobile products.

For details and the datasheet please contact the adv7533 HDMI transmitter provider.

The adv7533 transmitter does not support DSI burst mode. Check the pixel clock constraints in non-burst mode.

The adapter board B-LCDAD-HDMI1 is based on adv7533. It is compatible with the STM32MP157 evaluation boards and can be plugged in place of the display.

Information

Due to I2C address conflict, to use B-LCDAD-HDMI1 on STM32MP157 evaluation boards it's required to disconnect the camera module and remove the camera from the devicetree.

Information

The display connector of STM32MP157 evaluation boards does not provides audio signals; the B-LCDAD-HDMI1 will only convert DSI video signals.

3.1. Linux driver

Bindings: Documentation/devicetree/bindings/display/bridge/adi,adv7533.yaml

Sources: drivers/gpu/drm/bridge/adv7511/

Configuration:

• DRM_I2C_ADV7511
• DRM_I2C_ADV7511_AUDIO
• DRM_I2C_ADV7511_CEC

Devicetree example: [Click here to hide/show the example]

&dsi {
	ports {
		port@0 {
			reg = <0>;
			dsi_in: endpoint {
				remote-endpoint = <&ltdc_ep1_out>;
			};
		};

		port@1 {
			reg = <1>;
			dsi_out: endpoint {
				remote-endpoint = <&adv7533_in>;
			};
		};
	};
};

&i2c2 {
	adv7533: hdmi@3d {
		compatible = "adi,adv7533";
		reg = <0x3d>, <0x3c>, <0x3f>, <0x38>;
		reg-names = "main", "cec", "edid", "packet";
		status = "okay";
		adi,dsi-lanes = <2>;
		reset-gpios = <&gpiof 15 GPIO_ACTIVE_LOW>;

		ports {
			#address-cells = <1>;
			#size-cells = <0>;
			port@0 {
				reg = <0>;
				adv7533_in: endpoint {
					remote-endpoint = <&dsi_out>;
				};
			};
		};
	};
};

4. Silab sil9022

The SiI9022A HDMI transmitter supports the HDMI^® Specification on a wide range of mobile products.

For details and the datasheet please contact the SiI9022A HDMI transmitter provider.

4.1. Linux driver

Bindings: Documentation/devicetree/bindings/display/bridge/sii902x.txt

Sources: drivers/gpu/drm/bridge/sii902x.c

5. Toshiba tc358762

The tc358762 is a DSI de-serializer to parallel DPI or DBI. Only DPI output is supported in current Linux driver.

For details and the datasheet please contact the tc358762 device provider.

5.1. Linux driver

Bindings: Documentation/devicetree/bindings/display/bridge/toshiba,tc358762.yaml

Sources: drivers/gpu/drm/bridge/tc358762.c

Configuration:

• DRM_TOSHIBA_TC358762

Devicetree example: check the complete example for the Raspberry Pi 7" Touch Display.

Open portable trusted execution environment

Linux^® is a registered trademark of Linus Torvalds.

Display serial interface (MIPI^® Alliance standard)

High-definition multimedia interface (HDMI standard)

Display pixel interface (MIPI^® Alliance standard)

Inter-integrated circuit (Bi-directional 2-wire bus standard for efficient inter-IC control.)

Direct rendering manager (kernel module that gives direct hardware access to DRI clients, find more information on official DRI web site http://dri.freedesktop.org/wiki/DRM)

Consumer electronics control (HDMI standard)

General-purpose input/output (A realization of open ended transmission between devices on an embedded level. These pins available on a processor can be programmed to be used to either accept input or provide output to external devices depending on user desires and applications requirements.)

Display bus interface (MIPI^® Alliance standard)