[PATCH v4 0/9] Add support for i.MX94 DCIF

[PATCH v4 0/9] Add support for i.MX94 DCIF

[Laurentiu Palcu]

Hi,

This patch-set adds support for the i.MX94 Display Control Interface.
It depends on Peng Fan's DTS patch [1] that was not yet merged. Also, it
needs the BLK CTL changes [2] that I spinned off from v2 in a different
patchset.

Also, included in the patch-set are a few extra patches that the DCIF
driver depends on for functioning properly:
 * 1/9 - 3/9 : add support for i.MX94 to fsl-ldb driver. It also
			   contains a patch (2/9) from Liu Ying that was already reviewed
			   and was part of another patch-set ([3]), but was never merged;

v4:
 * Addressed remaining DCIF driver comments from Frank;
 * Limit the 'ldb' child node only to CSRs compatible with 'nxp,imx94-lvds-csr'
   in the binding file. Since LVDS CSRs are a minority, I chose to 
   use the if:then: construct instead of if:not:then:;
 * Remove the '#address-cells' and '#size-cells' from the ldb node, in
   imx94.dtsi, as they're not needed;

v3:
 * Removed the BLK CTL patches and created a separate patch set [2] for them;
 * Collected r-b tags for 1/9, 2/9, 3/9 and 9/9;
 * Removed the DCIF QoS functionality until I find a better way to
   implement it through syscon. QoS functionality will be added in
   subsequent patches. Also, used devm_clk_bulk_get_all() and used
   dev_err_probe() as suggested;
 * Addressed Frank's and Krzysztof's comments on the DCIF bindings;
 * Addressed Frank's comments on dtsi and dts files;
 * Added a new binding patch, 6/9, for adding 'ldb' optional property to
   nxp,imx95-blk-ctl.yaml;

v2:
 * reworked the BLK_CTL patch and split in 2 to make it easier for
   review;
 * split the dts and dtsi patch in 2 separate ones;
 * addressed Frank's comments in DCIF driver;
 * addressed Rob's comments for the bindings files;
 * addressed a couple of checkpatch issues;

Thanks,
Laurentiu

[1] https://lkml.org/lkml/2025/7/7/84
[2] https://www.spinics.net/lists/kernel/msg5791546.html
[3] https://lkml.org/lkml/2024/11/14/262

Laurentiu Palcu (7):
  dt-bindings: display: fsl,ldb: Add i.MX94 LDB
  drm/bridge: fsl-ldb: Add support for i.MX94
  dt-bindings: display: imx: Add bindings for i.MX94 DCIF
  dt-bindings: clock: nxp,imx95-blk-ctl: Add ldb child node
  arm64: dts: imx943: Add display pipeline nodes
  arm64: dts: imx943-evk: Add display support using IT6263
  MAINTAINERS: Add entry for i.MX94 DCIF driver

Liu Ying (1):
  drm/bridge: fsl-ldb: Get the next non-panel bridge

Sandor Yu (1):
  drm/imx: Add support for i.MX94 DCIF

 .../bindings/clock/nxp,imx95-blk-ctl.yaml     |  24 +-
 .../bindings/display/bridge/fsl,ldb.yaml      |   2 +
 .../bindings/display/imx/nxp,imx94-dcif.yaml  |  82 +++
 MAINTAINERS                                   |   9 +
 arch/arm64/boot/dts/freescale/imx943-evk.dts  | 121 +++
 arch/arm64/boot/dts/freescale/imx943.dtsi     |  53 +-
 drivers/gpu/drm/bridge/fsl-ldb.c              |  47 +-
 drivers/gpu/drm/imx/Kconfig                   |   1 +
 drivers/gpu/drm/imx/Makefile                  |   1 +
 drivers/gpu/drm/imx/dcif/Kconfig              |  15 +
 drivers/gpu/drm/imx/dcif/Makefile             |   5 +
 drivers/gpu/drm/imx/dcif/dcif-crc.c           | 211 ++++++
 drivers/gpu/drm/imx/dcif/dcif-crc.h           |  52 ++
 drivers/gpu/drm/imx/dcif/dcif-crtc.c          | 695 ++++++++++++++++++
 drivers/gpu/drm/imx/dcif/dcif-drv.c           | 226 ++++++
 drivers/gpu/drm/imx/dcif/dcif-drv.h           |  86 +++
 drivers/gpu/drm/imx/dcif/dcif-kms.c           | 100 +++
 drivers/gpu/drm/imx/dcif/dcif-plane.c         | 269 +++++++
 drivers/gpu/drm/imx/dcif/dcif-reg.h           | 267 +++++++
 19 files changed, 2243 insertions(+), 23 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/imx/nxp,imx94-dcif.yaml
 create mode 100644 drivers/gpu/drm/imx/dcif/Kconfig
 create mode 100644 drivers/gpu/drm/imx/dcif/Makefile
 create mode 100644 drivers/gpu/drm/imx/dcif/dcif-crc.c
 create mode 100644 drivers/gpu/drm/imx/dcif/dcif-crc.h
 create mode 100644 drivers/gpu/drm/imx/dcif/dcif-crtc.c
 create mode 100644 drivers/gpu/drm/imx/dcif/dcif-drv.c
 create mode 100644 drivers/gpu/drm/imx/dcif/dcif-drv.h
 create mode 100644 drivers/gpu/drm/imx/dcif/dcif-kms.c
 create mode 100644 drivers/gpu/drm/imx/dcif/dcif-plane.c
 create mode 100644 drivers/gpu/drm/imx/dcif/dcif-reg.h

-- 
2.49.0

[PATCH v4 1/9] dt-bindings: display: fsl,ldb: Add i.MX94 LDB

[Laurentiu Palcu]

i.MX94 has a single LVDS port and share similar LDB and LVDS control
registers as i.MX8MP and i.MX93.

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
 Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml b/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml
index 07388bf2b90df..a54b8f1478049 100644
--- a/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml
@@ -20,6 +20,7 @@ properties:
       - fsl,imx6sx-ldb
       - fsl,imx8mp-ldb
       - fsl,imx93-ldb
+      - fsl,imx94-ldb
 
   clocks:
     maxItems: 1
@@ -68,6 +69,7 @@ allOf:
             enum:
               - fsl,imx6sx-ldb
               - fsl,imx93-ldb
+              - fsl,imx94-ldb
     then:
       properties:
         ports:
-- 
2.49.0

[PATCH v4 4/9] dt-bindings: display: imx: Add bindings for i.MX94 DCIF

[Laurentiu Palcu]

DCIF is the i.MX94 Display Controller Interface which is used to
drive a TFT LCD panel or connects to a display interface depending
on the chip configuration.

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
---
 .../bindings/display/imx/nxp,imx94-dcif.yaml  | 82 +++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/imx/nxp,imx94-dcif.yaml

diff --git a/Documentation/devicetree/bindings/display/imx/nxp,imx94-dcif.yaml b/Documentation/devicetree/bindings/display/imx/nxp,imx94-dcif.yaml
new file mode 100644
index 0000000000000..54419c589ef74
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/imx/nxp,imx94-dcif.yaml
@@ -0,0 +1,82 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2025 NXP
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/imx/nxp,imx94-dcif.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: i.MX94 Display Control Interface (DCIF)
+
+maintainers:
+  - Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
+
+description:
+  The Display Control Interface(DCIF) is a system master that fetches graphics
+  stored in memory and displays them on a TFT LCD panel or connects to a
+  display interface depending on the chip configuration.
+
+properties:
+  compatible:
+    const: nxp,imx94-dcif
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: CPU domain 0 (controlled by common registers group).
+      - description: CPU domain 1 (controlled by background layer registers group).
+      - description: CPU domain 2 (controlled by foreground layer registers group).
+
+  interrupt-names:
+    items:
+      - const: common
+      - const: bg_layer
+      - const: fg_layer
+
+  clocks:
+    maxItems: 3
+
+  clock-names:
+    items:
+      - const: apb
+      - const: axi
+      - const: pix
+
+  power-domains:
+    maxItems: 1
+
+  port:
+    $ref: /schemas/graph.yaml#/properties/port
+    description: Display Pixel Interface(DPI) output port
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        display-controller@4b120000 {
+            compatible = "nxp,imx94-dcif";
+            reg = <0x0 0x4b120000 0x0 0x300000>;
+            interrupts = <GIC_SPI 377 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 378 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 379 IRQ_TYPE_LEVEL_HIGH>;
+            interrupt-names = "common", "bg_layer", "fg_layer";
+            clocks = <&scmi_clk 69>, <&scmi_clk 70>, <&dispmix_csr 0>;
+            clock-names = "apb", "axi", "pix";
+            assigned-clocks = <&dispmix_csr 0>;
+            assigned-clock-parents = <&ldb_pll_pixel>;
+            power-domains = <&scmi_devpd 11>;
+
+            port {
+                dcif_out: endpoint {
+                    remote-endpoint = <&ldb_in>;
+                };
+            };
+        };
+    };
-- 
2.49.0

[PATCH v4 6/9] dt-bindings: clock: nxp,imx95-blk-ctl: Add ldb child node

[Laurentiu Palcu]

Since the BLK CTL registers, like the LVDS CSR, can be used to control the
LVDS Display Bridge controllers, add 'ldb' child node to handle
these use cases.

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
---
 .../bindings/clock/nxp,imx95-blk-ctl.yaml     | 24 ++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/clock/nxp,imx95-blk-ctl.yaml b/Documentation/devicetree/bindings/clock/nxp,imx95-blk-ctl.yaml
index 27403b4c52d62..f83d96701bb04 100644
--- a/Documentation/devicetree/bindings/clock/nxp,imx95-blk-ctl.yaml
+++ b/Documentation/devicetree/bindings/clock/nxp,imx95-blk-ctl.yaml
@@ -39,6 +39,28 @@ properties:
       ID in its "clocks" phandle cell. See
       include/dt-bindings/clock/nxp,imx95-clock.h
 
+if:
+  properties:
+    compatible:
+      contains:
+        const: nxp,imx94-lvds-csr
+then:
+  properties:
+    "#address-cells":
+      const: 1
+
+    "#size-cells":
+      const: 1
+
+  patternProperties:
+    "^ldb@[0-9a-f]+$":
+      type: object
+      $ref: /schemas/display/bridge/fsl,ldb.yaml#
+
+  required:
+    - '#address-cells'
+    - '#size-cells'
+
 required:
   - compatible
   - reg
@@ -46,7 +68,7 @@ required:
   - power-domains
   - clocks
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |
-- 
2.49.0

[PATCH v4 7/9] arm64: dts: imx943: Add display pipeline nodes

[Laurentiu Palcu]

Add display controller and LDB support in imx943.

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
---
 arch/arm64/boot/dts/freescale/imx943.dtsi | 53 ++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx943.dtsi b/arch/arm64/boot/dts/freescale/imx943.dtsi
index 657c81b6016f2..9a91beef54e86 100644
--- a/arch/arm64/boot/dts/freescale/imx943.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx943.dtsi
@@ -148,7 +148,7 @@ l3_cache: l3-cache {
 		};
 	};
 
-	clock-ldb-pll-div7 {
+	clock_ldb_pll_div7: clock-ldb-pll-div7 {
 		compatible = "fixed-factor-clock";
 		#clock-cells = <0>;
 		clocks = <&scmi_clk IMX94_CLK_LDBPLL>;
@@ -174,9 +174,60 @@ dispmix_csr: syscon@4b010000 {
 		lvds_csr: syscon@4b0c0000 {
 			compatible = "nxp,imx94-lvds-csr", "syscon";
 			reg = <0x0 0x4b0c0000 0x0 0x10000>;
+			#address-cells = <1>;
+			#size-cells = <1>;
 			clocks = <&scmi_clk IMX94_CLK_DISPAPB>;
 			#clock-cells = <1>;
 			power-domains = <&scmi_devpd IMX94_PD_DISPLAY>;
+
+			ldb: ldb@4 {
+				compatible = "fsl,imx94-ldb";
+				reg = <0x4 0x4>, <0x8 0x4>;
+				reg-names = "ldb", "lvds";
+				clocks = <&lvds_csr IMX94_CLK_DISPMIX_LVDS_CLK_GATE>;
+				clock-names = "ldb";
+				status = "disabled";
+
+				ports {
+					#address-cells = <1>;
+					#size-cells = <0>;
+
+					port@0 {
+						reg = <0>;
+
+						lvds_in: endpoint {
+							remote-endpoint = <&dcif_out>;
+						};
+					};
+
+					port@1 {
+						reg = <1>;
+					};
+				};
+			};
+		};
+
+		dcif: display-controller@4b120000 {
+			compatible = "nxp,imx94-dcif";
+			reg = <0x0 0x4b120000 0x0 0x300000>;
+			interrupts = <GIC_SPI 377 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 378 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 379 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "common", "bg_layer", "fg_layer";
+			clocks = <&scmi_clk IMX94_CLK_DISPAPB>,
+				 <&scmi_clk IMX94_CLK_DISPAXI>,
+				 <&dispmix_csr IMX94_CLK_DISPMIX_CLK_SEL>;
+			clock-names = "apb", "axi", "pix";
+			assigned-clocks = <&dispmix_csr IMX94_CLK_DISPMIX_CLK_SEL>;
+			assigned-clock-parents = <&clock_ldb_pll_div7>;
+			power-domains = <&scmi_devpd IMX94_PD_DISPLAY>;
+			status = "disabled";
+
+			port {
+				dcif_out: endpoint {
+					remote-endpoint = <&lvds_in>;
+				};
+			};
 		};
 	};
 };
-- 
2.49.0

[PATCH v4 8/9] arm64: dts: imx943-evk: Add display support using IT6263

[Laurentiu Palcu]

The ITE IT6263 based NXP LVDS to HDMI converter can be attached to the
i.MX943 EVK board LVDS port using the mini-SAS connector. Since this is
the default configuration for the EVK, add support for it here.

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
---
 arch/arm64/boot/dts/freescale/imx943-evk.dts | 121 +++++++++++++++++++
 1 file changed, 121 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx943-evk.dts b/arch/arm64/boot/dts/freescale/imx943-evk.dts
index c8c3eff9df1a2..5900ff355abc2 100644
--- a/arch/arm64/boot/dts/freescale/imx943-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx943-evk.dts
@@ -34,6 +34,18 @@ dmic: dmic {
 		#sound-dai-cells = <0>;
 	};
 
+	hdmi-connector {
+		compatible = "hdmi-connector";
+		label = "hdmi";
+		type = "a";
+
+		port {
+			hdmi_connector_in: endpoint {
+				remote-endpoint = <&it6263_out>;
+			};
+		};
+	};
+
 	reg_usdhc2_vmmc: regulator-usdhc2 {
 		compatible = "regulator-fixed";
 		off-on-delay-us = <12000>;
@@ -127,6 +139,115 @@ memory@80000000 {
 	};
 };
 
+&dcif {
+	status = "okay";
+};
+
+&ldb {
+	assigned-clocks = <&scmi_clk IMX94_CLK_LDBPLL_VCO>,
+			  <&scmi_clk IMX94_CLK_LDBPLL>;
+	assigned-clock-rates = <4158000000>, <1039500000>;
+	status = "okay";
+
+	ports {
+		port@1 {
+			lvds_out: endpoint {
+				remote-endpoint = <&it6263_in>;
+			};
+		};
+	};
+};
+
+&lpi2c3 {
+	clock-frequency = <400000>;
+	pinctrl-0 = <&pinctrl_lpi2c3>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	pca9548_i2c3: i2c-mux@77 {
+		compatible = "nxp,pca9548";
+		reg = <0x77>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		i2c@0 {
+			reg = <0>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		i2c@1 {
+			reg = <1>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		i2c@2 {
+			reg = <2>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		i2c@3 {
+			reg = <3>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			lvds-to-hdmi-bridge@4c {
+				compatible = "ite,it6263";
+				reg = <0x4c>;
+				data-mapping = "jeida-24";
+				reset-gpios = <&pcal6416_i2c3_u171 8 GPIO_ACTIVE_HIGH>;
+
+				ports {
+					#address-cells = <1>;
+					#size-cells = <0>;
+
+					port@0 {
+						reg = <0>;
+
+						it6263_in: endpoint {
+							remote-endpoint = <&lvds_out>;
+						};
+					};
+
+					port@2 {
+						reg = <2>;
+
+						it6263_out: endpoint {
+							remote-endpoint = <&hdmi_connector_in>;
+						};
+					};
+				};
+			};
+		};
+
+		i2c@4 {
+			reg = <4>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		i2c@5 {
+			reg = <5>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		i2c@6 {
+			reg = <6>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		i2c@7 {
+			reg = <7>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+	};
+};
+
 &lpi2c3 {
 	clock-frequency = <400000>;
 	pinctrl-0 = <&pinctrl_lpi2c3>;
-- 
2.49.0

Re: [PATCH v4 4/9] dt-bindings: display: imx: Add bindings for i.MX94 DCIF

[Frank Li]

On Wed, Sep 03, 2025 at 03:33:22PM +0300, Laurentiu Palcu wrote:
> DCIF is the i.MX94 Display Controller Interface which is used to
> drive a TFT LCD panel or connects to a display interface depending
> on the chip configuration.
>
> Signed-off-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
> ---
>  .../bindings/display/imx/nxp,imx94-dcif.yaml  | 82 +++++++++++++++++++
>  1 file changed, 82 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/imx/nxp,imx94-dcif.yaml
>
> diff --git a/Documentation/devicetree/bindings/display/imx/nxp,imx94-dcif.yaml b/Documentation/devicetree/bindings/display/imx/nxp,imx94-dcif.yaml
> new file mode 100644
> index 0000000000000..54419c589ef74
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/imx/nxp,imx94-dcif.yaml
> @@ -0,0 +1,82 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2025 NXP
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/imx/nxp,imx94-dcif.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: i.MX94 Display Control Interface (DCIF)
> +
> +maintainers:
> +  - Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
> +
> +description:
> +  The Display Control Interface(DCIF) is a system master that fetches graphics
> +  stored in memory and displays them on a TFT LCD panel or connects to a
> +  display interface depending on the chip configuration.
> +
> +properties:
> +  compatible:
> +    const: nxp,imx94-dcif
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    items:
> +      - description: CPU domain 0 (controlled by common registers group).
> +      - description: CPU domain 1 (controlled by background layer registers group).
> +      - description: CPU domain 2 (controlled by foreground layer registers group).
> +
> +  interrupt-names:
> +    items:
> +      - const: common
> +      - const: bg_layer
> +      - const: fg_layer
> +
> +  clocks:
> +    maxItems: 3
> +
> +  clock-names:
> +    items:
> +      - const: apb
> +      - const: axi
> +      - const: pix
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  port:
> +    $ref: /schemas/graph.yaml#/properties/port
> +    description: Display Pixel Interface(DPI) output port

I still suggest ref to
Documentation/devicetree/bindings/media/video-interfaces.yaml

because it may need set hsync-active, vsync-active, bus-type for some
special TFT pannel in future.

I know driver may not use these now, but binding is descript hardware,
try best to make it complete.

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;

example needn't exactly copy from dts. you can make "reg" by use 32bit
address, and remove soc layer to keep example simple.

Frank
> +
> +        display-controller@4b120000 {
> +            compatible = "nxp,imx94-dcif";
> +            reg = <0x0 0x4b120000 0x0 0x300000>;
> +            interrupts = <GIC_SPI 377 IRQ_TYPE_LEVEL_HIGH>,
> +                         <GIC_SPI 378 IRQ_TYPE_LEVEL_HIGH>,
> +                         <GIC_SPI 379 IRQ_TYPE_LEVEL_HIGH>;
> +            interrupt-names = "common", "bg_layer", "fg_layer";
> +            clocks = <&scmi_clk 69>, <&scmi_clk 70>, <&dispmix_csr 0>;
> +            clock-names = "apb", "axi", "pix";
> +            assigned-clocks = <&dispmix_csr 0>;
> +            assigned-clock-parents = <&ldb_pll_pixel>;
> +            power-domains = <&scmi_devpd 11>;
> +
> +            port {
> +                dcif_out: endpoint {
> +                    remote-endpoint = <&ldb_in>;
> +                };
> +            };
> +        };
> +    };
> --
> 2.49.0
>