Display bridges hardware components

Applicable for STM32MP13x lines, STM32MP15x lines

1 Article purpose[edit]

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[edit]

Domain Peripheral Software components Comment
OP-TEE Linux STM32Cube
Visual Analog Devices adv7533 DRM/KMS framework MIPI® DSI to HDMI transmitter
Visual Silab sil9022 DRM/KMS framework Parallel RGB (DPI) to HDMI transmitter
Visual Toshiba tc358762 DRM/KMS framework MIPI® DSI to Parallel RGB (DPI)
Visual Analog Devices adv7513 DRM/KMS framework Parallel RGB (DPI) to HDMI transmitter

3 Analog Devices adv7533[edit]

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[1] is based on adv7533. It is compatible with the STM32MP157 evaluation boards and can be plugged in place of the display.

Info white.png 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.
Info white.png 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[edit]

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 with the B-LCDAD-HDMI1[1] board connected to the STM32MP157 evaluation board: arch/arm/boot/dts/stm32mp157c-ev1.dts 

/ {
	...
	hdmi-out {
		compatible = "hdmi-connector";
		type = "a";
	
		port {
			hdmi_con: endpoint {
					remote-endpoint = <&adv7533_out>;
				};
			};
	};
};

&dsi {
	#address-cells = <1>;
	#size-cells = <0>;
	status = "okay";
	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>;
				};
			};

			port@1 {
				reg=<1>;
				adv7533_out: endpoint {
					remote-endpoint = <&hdmi_con>;
				};
			};
		};
	};
};

/* We disable the ov5640 node because it uses the same I2C address than HDMI-CEC */
&ov5640 {
	status = "disabled";
};


4 Silab sil9022[edit]

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.

Info white.png Information
This HDMI transmitter can be found on some STM32MP1 Discovery kits.

4.1 Linux driver[edit]

Bindings: Documentation/devicetree/bindings/display/bridge/sil,sii9022.yaml

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

Configuration: DRM_SII902X

Devicetree example: arch/arm/boot/dts/stm32mp15xx-dkx.dtsi 

&i2c1 {
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&i2c1_pins_a>;
	pinctrl-1 = <&i2c1_sleep_pins_a>;
	i2c-scl-rising-time-ns = <100>;
	i2c-scl-falling-time-ns = <7>;
	status = "okay";
	/delete-property/dmas;
	/delete-property/dma-names;

	hdmi-transmitter@39 {
		compatible = "sil,sii9022";
		reg = <0x39>;
		iovcc-supply = <&v3v3_hdmi>;
		cvcc12-supply = <&v1v2_hdmi>;
		reset-gpios = <&gpioa 10 GPIO_ACTIVE_LOW>;
		interrupts = <1 IRQ_TYPE_EDGE_FALLING>;
		interrupt-parent = <&gpiog>;
		#sound-dai-cells = <0>;
		status = "okay";

		ports {
			#address-cells = <1>;
			#size-cells = <0>;

			port@0 {
				reg = <0>;
				sii9022_in: endpoint {
					remote-endpoint = <&ltdc_ep0_out>;
				};
			};

			port@3 {
				reg = <3>;
				sii9022_tx_endpoint: endpoint {
					remote-endpoint = <&i2s2_endpoint>;
				};
			};
		};
	};
...
};

&ltdc {
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&ltdc_pins_a>;
	pinctrl-1 = <&ltdc_sleep_pins_a>;
	status = "okay";

	port {
		ltdc_ep0_out: endpoint@0 {
			reg = <0>;
			remote-endpoint = <&sii9022_in>;
		};
	};
};

Devicetree pin control bindings example: arch/arm/boot/dts/stm32mp15-pinctrl.dtsi 

&pinctrl {
...
	ltdc_pins_a: ltdc-0 {
		pins {
			pinmux = <STM32_PINMUX('G',  7, AF14)>, /* LCD_CLK */
				 <STM32_PINMUX('I', 10, AF14)>, /* LCD_HSYNC */
				 <STM32_PINMUX('I',  9, AF14)>, /* LCD_VSYNC */
				 <STM32_PINMUX('F', 10, AF14)>, /* LCD_DE */
				 <STM32_PINMUX('H',  2, AF14)>, /* LCD_R0 */
				 <STM32_PINMUX('H',  3, AF14)>, /* LCD_R1 */
				 <STM32_PINMUX('H',  8, AF14)>, /* LCD_R2 */
				 <STM32_PINMUX('H',  9, AF14)>, /* LCD_R3 */
				 <STM32_PINMUX('H', 10, AF14)>, /* LCD_R4 */
				 <STM32_PINMUX('C',  0, AF14)>, /* LCD_R5 */
				 <STM32_PINMUX('H', 12, AF14)>, /* LCD_R6 */
				 <STM32_PINMUX('E', 15, AF14)>, /* LCD_R7 */
				 <STM32_PINMUX('E',  5, AF14)>, /* LCD_G0 */
				 <STM32_PINMUX('E',  6, AF14)>, /* LCD_G1 */
				 <STM32_PINMUX('H', 13, AF14)>, /* LCD_G2 */
				 <STM32_PINMUX('H', 14, AF14)>, /* LCD_G3 */
				 <STM32_PINMUX('H', 15, AF14)>, /* LCD_G4 */
				 <STM32_PINMUX('I',  0, AF14)>, /* LCD_G5 */
				 <STM32_PINMUX('I',  1, AF14)>, /* LCD_G6 */
				 <STM32_PINMUX('I',  2, AF14)>, /* LCD_G7 */
				 <STM32_PINMUX('D',  9, AF14)>, /* LCD_B0 */
				 <STM32_PINMUX('G', 12, AF14)>, /* LCD_B1 */
				 <STM32_PINMUX('G', 10, AF14)>, /* LCD_B2 */
				 <STM32_PINMUX('D', 10, AF14)>, /* LCD_B3 */
				 <STM32_PINMUX('I',  4, AF14)>, /* LCD_B4 */
				 <STM32_PINMUX('A',  3, AF14)>, /* LCD_B5 */
				 <STM32_PINMUX('B',  8, AF14)>, /* LCD_B6 */
				 <STM32_PINMUX('D',  8, AF14)>; /* LCD_B7 */
			bias-disable;
			drive-push-pull;
			slew-rate = <1>;
		};
	};

	ltdc_sleep_pins_a: ltdc-sleep-0 {
		pins {
			pinmux = <STM32_PINMUX('G',  7, ANALOG)>, /* LCD_CLK */
				 <STM32_PINMUX('I', 10, ANALOG)>, /* LCD_HSYNC */
				 <STM32_PINMUX('I',  9, ANALOG)>, /* LCD_VSYNC */
				 <STM32_PINMUX('F', 10, ANALOG)>, /* LCD_DE */
				 <STM32_PINMUX('H',  2, ANALOG)>, /* LCD_R0 */
				 <STM32_PINMUX('H',  3, ANALOG)>, /* LCD_R1 */
				 <STM32_PINMUX('H',  8, ANALOG)>, /* LCD_R2 */
				 <STM32_PINMUX('H',  9, ANALOG)>, /* LCD_R3 */
				 <STM32_PINMUX('H', 10, ANALOG)>, /* LCD_R4 */
				 <STM32_PINMUX('C',  0, ANALOG)>, /* LCD_R5 */
				 <STM32_PINMUX('H', 12, ANALOG)>, /* LCD_R6 */
				 <STM32_PINMUX('E', 15, ANALOG)>, /* LCD_R7 */
				 <STM32_PINMUX('E',  5, ANALOG)>, /* LCD_G0 */
				 <STM32_PINMUX('E',  6, ANALOG)>, /* LCD_G1 */
				 <STM32_PINMUX('H', 13, ANALOG)>, /* LCD_G2 */
				 <STM32_PINMUX('H', 14, ANALOG)>, /* LCD_G3 */
				 <STM32_PINMUX('H', 15, ANALOG)>, /* LCD_G4 */
				 <STM32_PINMUX('I',  0, ANALOG)>, /* LCD_G5 */
				 <STM32_PINMUX('I',  1, ANALOG)>, /* LCD_G6 */
				 <STM32_PINMUX('I',  2, ANALOG)>, /* LCD_G7 */
				 <STM32_PINMUX('D',  9, ANALOG)>, /* LCD_B0 */
				 <STM32_PINMUX('G', 12, ANALOG)>, /* LCD_B1 */
				 <STM32_PINMUX('G', 10, ANALOG)>, /* LCD_B2 */
				 <STM32_PINMUX('D', 10, ANALOG)>, /* LCD_B3 */
				 <STM32_PINMUX('I',  4, ANALOG)>, /* LCD_B4 */
				 <STM32_PINMUX('A',  3, ANALOG)>, /* LCD_B5 */
				 <STM32_PINMUX('B',  8, ANALOG)>, /* LCD_B6 */
				 <STM32_PINMUX('D',  8, ANALOG)>; /* LCD_B7 */
		};
	};
...
};

5 Toshiba tc358762[edit]

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[edit]

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.


6 Analog Devices adv7513[edit]

The Analog Devices adv7513 Parallel RGB (DPI) to HDMI transmitter supports the HDMI® Specification on a wide range of mobile products.

For details and the datasheet please contact the adv7513 HDMI transmitter provider.

Info white.png Information
This HDMI transmitter can be found on some dh-electronics AVENGER 96Boards compliant consumer edition boards.

6.1 Linux driver[edit]

Bindings: Documentation/devicetree/bindings/display/bridge/adi,adv7511.yaml

Sources: drivers/gpu/drm/bridge/adv7511

Configuration:

  • DRM_I2C_ADV7511
  • DRM_I2C_ADV7511_AUDIO
  • DRM_I2C_ADV7511_CEC

Devicetree example: arch/arm/boot/dts/stm32mp15xx-dhcor-avenger96.dtsi 

/ {

	hdmi-out {
		compatible = "hdmi-connector";
		type = "a";

		port {
			hdmi_con: endpoint {
				remote-endpoint = <&adv7513_out>;
			};
		};
	};
...
	sound {
		compatible = "audio-graph-card";
		label = "STM32MP1-AV96-HDMI";
		dais = <&sai2a_port>;
		status = "okay";
	};
...
};

&i2c4 {
	hdmi-transmitter@3d {
		compatible = "adi,adv7513";
		reg = <0x3d>, <0x4d>, <0x2d>, <0x5d>;
		reg-names = "main", "edid", "cec", "packet";
		clocks = <&cec_clock>;
		clock-names = "cec";

		avdd-supply = <&v3v3>;
		dvdd-supply = <&v3v3>;
		pvdd-supply = <&v3v3>;
		dvdd-3v-supply = <&v3v3>;
		bgvdd-supply = <&v3v3>;

		interrupts = <9 IRQ_TYPE_EDGE_FALLING>;
		interrupt-parent = <&gpiog>;

		status = "okay";

		adi,input-depth = <8>;
		adi,input-colorspace = "rgb";
		adi,input-clock = "1x";

		ports {
			#address-cells = <1>;
			#size-cells = <0>;

			port@0 {
				reg = <0>;
				adv7513_in: endpoint {
					remote-endpoint = <&ltdc_ep0_out>;
				};
			};

			port@1 {
				reg = <1>;
				adv7513_out: endpoint {
					remote-endpoint = <&hdmi_con>;
				};
			};

			port@2 {
				reg = <2>;
				adv7513_i2s0: endpoint {
					remote-endpoint = <&sai2a_endpoint>;
				};
			};
		};
	};
};

&ltdc {
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&ltdc_pins_d>;
	pinctrl-1 = <&ltdc_sleep_pins_d>;
	status = "okay";

	port {
		#address-cells = <1>;
		#size-cells = <0>;

		ltdc_ep0_out: endpoint@0 {
			reg = <0>;
			remote-endpoint = <&adv7513_in>;
		};
	};
};

Devicetree pin control bindings example: arch/arm/boot/dts/stm32mp15-pinctrl.dtsi 

&pinctrl {
...
	ltdc_pins_d: ltdc-3 {
		pins1 {
			pinmux = <STM32_PINMUX('G',  7, AF14)>; /* LCD_CLK */
			bias-disable;
			drive-push-pull;
			slew-rate = <3>;
		};
		pins2 {
			pinmux = <STM32_PINMUX('I', 10, AF14)>, /* LCD_HSYNC */
				 <STM32_PINMUX('I',  9, AF14)>, /* LCD_VSYNC */
				 <STM32_PINMUX('E', 13, AF14)>, /* LCD_DE */
				 <STM32_PINMUX('G', 13, AF14)>, /* LCD_R0 */
				 <STM32_PINMUX('H',  3, AF14)>, /* LCD_R1 */
				 <STM32_PINMUX('H',  8, AF14)>, /* LCD_R2 */
				 <STM32_PINMUX('H',  9, AF14)>, /* LCD_R3 */
				 <STM32_PINMUX('A',  5, AF14)>, /* LCD_R4 */
				 <STM32_PINMUX('H', 11, AF14)>, /* LCD_R5 */
				 <STM32_PINMUX('H', 12, AF14)>, /* LCD_R6 */
				 <STM32_PINMUX('E', 15, AF14)>, /* LCD_R7 */
				 <STM32_PINMUX('E',  5, AF14)>, /* LCD_G0 */
				 <STM32_PINMUX('B',  0, AF14)>, /* LCD_G1 */
				 <STM32_PINMUX('H', 13, AF14)>, /* LCD_G2 */
				 <STM32_PINMUX('E', 11, AF14)>, /* LCD_G3 */
				 <STM32_PINMUX('H', 15, AF14)>, /* LCD_G4 */
				 <STM32_PINMUX('H',  4,  AF9)>, /* LCD_G5 */
				 <STM32_PINMUX('I', 11,  AF9)>, /* LCD_G6 */
				 <STM32_PINMUX('G',  8, AF14)>, /* LCD_G7 */
				 <STM32_PINMUX('D',  9, AF14)>, /* LCD_B0 */
				 <STM32_PINMUX('G', 12, AF14)>, /* LCD_B1 */
				 <STM32_PINMUX('G', 10, AF14)>, /* LCD_B2 */
				 <STM32_PINMUX('D', 10, AF14)>, /* LCD_B3 */
				 <STM32_PINMUX('E', 12, AF14)>, /* LCD_B4 */
				 <STM32_PINMUX('A',  3, AF14)>, /* LCD_B5 */
				 <STM32_PINMUX('B',  8, AF14)>, /* LCD_B6 */
				 <STM32_PINMUX('I',  7, AF14)>; /* LCD_B7 */
			bias-disable;
			drive-push-pull;
			slew-rate = <2>;
		};
	};

	ltdc_sleep_pins_d: ltdc-sleep-3 {
		pins {
			pinmux = <STM32_PINMUX('G',  7, ANALOG)>, /* LCD_CLK */
				 <STM32_PINMUX('I', 10, ANALOG)>, /* LCD_HSYNC */
				 <STM32_PINMUX('I',  9, ANALOG)>, /* LCD_VSYNC */
				 <STM32_PINMUX('E', 13, ANALOG)>, /* LCD_DE */
				 <STM32_PINMUX('G', 13, ANALOG)>, /* LCD_R0 */
				 <STM32_PINMUX('H',  3, ANALOG)>, /* LCD_R1 */
				 <STM32_PINMUX('H',  8, ANALOG)>, /* LCD_R2 */
				 <STM32_PINMUX('H',  9, ANALOG)>, /* LCD_R3 */
				 <STM32_PINMUX('A',  5, ANALOG)>, /* LCD_R4 */
				 <STM32_PINMUX('H', 11, ANALOG)>, /* LCD_R5 */
				 <STM32_PINMUX('H', 12, ANALOG)>, /* LCD_R6 */
				 <STM32_PINMUX('E', 15, ANALOG)>, /* LCD_R7 */
				 <STM32_PINMUX('E',  5, ANALOG)>, /* LCD_G0 */
				 <STM32_PINMUX('B',  0, ANALOG)>, /* LCD_G1 */
				 <STM32_PINMUX('H', 13, ANALOG)>, /* LCD_G2 */
				 <STM32_PINMUX('E', 11, ANALOG)>, /* LCD_G3 */
				 <STM32_PINMUX('H', 15, ANALOG)>, /* LCD_G4 */
				 <STM32_PINMUX('H',  4, ANALOG)>, /* LCD_G5 */
				 <STM32_PINMUX('I', 11, ANALOG)>, /* LCD_G6 */
				 <STM32_PINMUX('G',  8, ANALOG)>, /* LCD_G7 */
				 <STM32_PINMUX('D',  9, ANALOG)>, /* LCD_B0 */
				 <STM32_PINMUX('G', 12, ANALOG)>, /* LCD_B1 */
				 <STM32_PINMUX('G', 10, ANALOG)>, /* LCD_B2 */
				 <STM32_PINMUX('D', 10, ANALOG)>, /* LCD_B3 */
				 <STM32_PINMUX('E', 12, ANALOG)>, /* LCD_B4 */
				 <STM32_PINMUX('A',  3, ANALOG)>, /* LCD_B5 */
				 <STM32_PINMUX('B',  8, ANALOG)>, /* LCD_B6 */
				 <STM32_PINMUX('I',  7, ANALOG)>; /* LCD_B7 */
		};
	};

...
};

7 References[edit]

  1. ↑ 1.01.1 B-LCDAD-HDMI1 adapter board



Open portable trusted execution environment

Linux® is a registered trademark of Linus Torvalds.

Mobile Industry Processor Interface, open membership organization that includes leading companies in the mobile industry that share the objective of defining and promoting open specifications for interfaces inside mobile terminals, see MIPI® Alliance standard web site https://www.mipi.org

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)

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