[PATCH v3 01/14] arm64: dts: imx8mm-kontron: Add support for display bridges on BL i.MX8MM

Frieder Schrempf
2023-12-06T14:44:32Z

The Kontron Electronics BL i.MX8MM has oboard disply bridges for
DSI->HDMI and DSI->LVDS conversion. The DSI interface is muxed by
a GPIO-controlled switch to one of these two bridges.

By default the HDMI bridge is enabled. The LVDS bridge can be
selected by loading an additional (panel-specific) overlay.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
---
Changes for v3:
* Address Shawn's review comments (thanks!)

Changes for v2:
* Rework DSI mux GPIO logic to be compatible with overlay
* Switch from 4 to 2 DSI lanes for LVDS bridge to fix non-working display
---
.../boot/dts/freescale/imx8mm-kontron-bl.dts | 160 ++++++++++++++++++
1 file changed, 160 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-bl.dts b/arch/arm64/boot/dts/freescale/imx8mm-kontron-bl.dts
index dcec57c20399e..a0f0be3f104fb 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-bl.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-bl.dts
@@ -25,6 +25,17 @@ osc_can: clock-osc-can {
clock-output-names = "osc-can";
};

+ hdmi-out {
+ compatible = "hdmi-connector";
+ type = "a";
+
+ port {
+ hdmi_in_conn: endpoint {
+ remote-endpoint = <&bridge_out_conn>;
+ };
+ };
+ };
+
leds {
compatible = "gpio-leds";
pinctrl-names = "default";
@@ -132,6 +143,104 @@ ethphy: ethernet-phy@0 {
};
};

+&gpio4 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_gpio4>;
+
+ dsi_mux_sel_hdmi: dsi-mux-sel-hdmi-hog {
+ gpio-hog;
+ gpios = <14 GPIO_ACTIVE_HIGH>;
+ output-high;
+ line-name = "dsi-mux-sel";
+ };
+
+ dsi_mux_sel_lvds: dsi-mux-sel-lvds-hog {
+ gpio-hog;
+ gpios = <14 GPIO_ACTIVE_HIGH>;
+ output-low;
+ line-name = "dsi-mux-sel";
+ status = "disabled";
+ };
+
+ dsi-mux-oe-hog {
+ gpio-hog;
+ gpios = <15 GPIO_ACTIVE_LOW>;
+ output-high;
+ line-name = "dsi-mux-oe";
+ };
+};
+
+&i2c3 {
+ clock-frequency = <400000>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_i2c3>;
+ status = "okay";
+
+ hdmi: hdmi@39 {
+ compatible = "adi,adv7535";
+ reg = <0x39>;
+
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_adv7535>;
+
+ interrupt-parent = <&gpio4>;
+ interrupts = <16 IRQ_TYPE_LEVEL_LOW>;
+
+ adi,dsi-lanes = <4>;
+
+ a2vdd-supply = <&reg_vdd_1v8>;
+ avdd-supply = <&reg_vdd_1v8>;
+ dvdd-supply = <&reg_vdd_1v8>;
+ pvdd-supply = <&reg_vdd_1v8>;
+ v1p2-supply = <&reg_vdd_1v8>;
+ v3p3-supply = <&reg_vdd_3v3>;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port@0 {
+ reg = <0>;
+
+ bridge_in_dsi_hdmi: endpoint {
+ remote-endpoint = <&dsi_out_bridge>;
+ };
+ };
+
+ port@1 {
+ reg = <1>;
+
+ bridge_out_conn: endpoint {
+ remote-endpoint = <&hdmi_in_conn>;
+ };
+ };
+ };
+ };
+
+ lvds: bridge@2c {
+ compatible = "ti,sn65dsi84";
+ reg = <0x2c>;
+ enable-gpios = <&gpio4 26 GPIO_ACTIVE_HIGH>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_sn65dsi84>;
+ status = "disabled";
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port@0 {
+ reg = <0>;
+
+ bridge_in_dsi_lvds: endpoint {
+ remote-endpoint = <&dsi_out_bridge>;
+ data-lanes = <1 2>;
+ };
+ };
+ };
+ };
+};
+
&i2c4 {
clock-frequency = <100000>;
pinctrl-names = "default";
@@ -144,6 +253,30 @@ rx8900: rtc@32 {
};
};

+&lcdif {
+ status = "okay";
+};
+
+&mipi_dsi {
+ samsung,esc-clock-frequency = <54000000>;
+ /*
+ * Let the driver calculate an appropriate clock rate based on the pixel
+ * clock instead of using the fixed value from imx8mm.dtsi.
+ */
+ /delete-property/ samsung,pll-clock-frequency;
+ status = "okay";
+
+ ports {
+ port@1 {
+ reg = <1>;
+
+ dsi_out_bridge: endpoint {
+ remote-endpoint = <&bridge_in_dsi_hdmi>;
+ };
+ };
+ };
+};
+
&pwm2 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pwm2>;
@@ -207,6 +340,12 @@ &iomuxc {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_gpio>;

+ pinctrl_adv7535: adv7535grp {
+ fsl,pins = <
+ MX8MM_IOMUXC_SAI1_TXD4_GPIO4_IO16 0x19
+ >;
+ };
+
pinctrl_can: cangrp {
fsl,pins = <
MX8MM_IOMUXC_SAI3_RXFS_GPIO4_IO28 0x19
@@ -277,6 +416,20 @@ MX8MM_IOMUXC_SAI3_MCLK_GPIO5_IO2 0x19
>;
};

+ pinctrl_gpio4: gpio4grp {
+ fsl,pins = <
+ MX8MM_IOMUXC_SAI1_TXD2_GPIO4_IO14 0x19
+ MX8MM_IOMUXC_SAI1_TXD3_GPIO4_IO15 0x19
+ >;
+ };
+
+ pinctrl_i2c3: i2c3grp {
+ fsl,pins = <
+ MX8MM_IOMUXC_I2C3_SCL_I2C3_SCL 0x40000083
+ MX8MM_IOMUXC_I2C3_SDA_I2C3_SDA 0x40000083
+ >;
+ };
+
pinctrl_i2c4: i2c4grp {
fsl,pins = <
MX8MM_IOMUXC_I2C4_SCL_I2C4_SCL 0x400001c3
@@ -290,6 +443,13 @@ MX8MM_IOMUXC_SPDIF_RX_PWM2_OUT 0x19
>;
};

+ pinctrl_sn65dsi84: sn65dsi84grp {
+ fsl,pins = <
+ MX8MM_IOMUXC_SAI2_TXD0_GPIO4_IO26 0x19
+ MX8MM_IOMUXC_SD2_WP_GPIO2_IO20 0x19
+ >;
+ };
+
pinctrl_uart1: uart1grp {
fsl,pins = <
MX8MM_IOMUXC_SAI2_RXC_UART1_DCE_RX 0x140
--
2.43.0