[PATCH v3 1/4] dt-bindings: display: bridge: ldb: Adjust imx6sx entries

[PATCH v3 1/4] dt-bindings: display: bridge: ldb: Adjust imx6sx entries

[Fabio Estevam]

From: Fabio Estevam <festevam@denx.de>

On the i.MX6SX there is a single entry for 'reg' and 'reg-names', so add
some logic to reflect that.

Signed-off-by: Fabio Estevam <festevam@denx.de>
---
Changes since v2:
- Newly introduced.

 .../bindings/display/bridge/fsl,ldb.yaml      | 28 +++++++++++++++++--
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml b/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml
index 07388bf2b90d..cd63f9ef9484 100644
--- a/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml
@@ -28,12 +28,12 @@ properties:
     const: ldb
 
   reg:
+    minItems: 1
     maxItems: 2
 
   reg-names:
-    items:
-      - const: ldb
-      - const: lvds
+    minItems: 1
+    maxItems: 2
 
   ports:
     $ref: /schemas/graph.yaml#/properties/ports
@@ -74,6 +74,28 @@ allOf:
           properties:
             port@2: false
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - fsl,imx6sx-ldb
+    then:
+      properties:
+        reg:
+          maxItems: 1
+        reg-names:
+          items:
+            - const: ldb
+    else:
+      properties:
+        reg:
+          minItems: 2
+        reg-names:
+          items:
+            - const: ldb
+            - const: lvds
+
 additionalProperties: false
 
 examples:
-- 
2.34.1

[PATCH v3 2/4] dt-bindings: soc: Add i.MX6SX General Purpose Register

[Fabio Estevam]

From: Fabio Estevam <festevam@denx.de>

The i.MX6SX General Purpose Registers is a set of register that serves
various different purposes and in particular, IOMUXC_GPR_GPR6, at
offset 0x18, can be used to configure the LDB block.

Signed-off-by: Fabio Estevam <festevam@denx.de>
---
Changes since v2:
- Newly introduced.

 .../bindings/soc/imx/fsl,imx6sx-gpr.yaml      | 83 +++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/imx/fsl,imx6sx-gpr.yaml

diff --git a/Documentation/devicetree/bindings/soc/imx/fsl,imx6sx-gpr.yaml b/Documentation/devicetree/bindings/soc/imx/fsl,imx6sx-gpr.yaml
new file mode 100644
index 000000000000..9336e87cc976
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/imx/fsl,imx6sx-gpr.yaml
@@ -0,0 +1,83 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/imx/fsl,imx6sx-gpr.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP i.MX6SX General Purpose Register
+
+maintainers:
+  - Fabio Estevam <festevam@denx.de>
+
+description:
+  The i.MX6SX General Purpose Registers is a set of register that serves
+  for various purposes and in particular, IOMUXC_GPR_GPR6, at offset 0x18,
+  can be used to configure the LDB block.
+
+properties:
+  compatible:
+    items:
+      - const: fsl,imx6sx-gpr
+      - const: syscon
+
+  reg:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 1
+
+  bridge@18:
+    type: object
+    $ref: /schemas/display/bridge/fsl,ldb.yaml#
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - '#address-cells'
+  - '#size-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx6sx-clock.h>
+
+    iomuxc-gpr@20e4000 {
+        compatible = "fsl,imx6sx-iomuxc-gpr", "fsl,imx6q-iomuxc-gpr", "syscon";
+        reg = <0x020e4000 0x4000>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        bridge@18 {
+            compatible = "fsl,imx6sx-ldb";
+            reg = <0x18 0x4>;
+            reg-names = "ldb";
+            clocks = <&clks IMX6SX_CLK_LDB_DI0>;
+            clock-names = "ldb";
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    reg = <0>;
+
+                    ldb_from_lcdif1: endpoint {
+                        remote-endpoint = <&lcdif1_to_ldb>;
+                    };
+                };
+
+               port@1 {
+                   reg = <1>;
+
+                   ldb_lvds_ch0: endpoint {
+                   };
+               };
+            };
+        };
+    };
+...
-- 
2.34.1

Re: [PATCH v3 2/4] dt-bindings: soc: Add i.MX6SX General Purpose Register

[Rob Herring]

On Fri, 19 May 2023 08:29:12 -0300, Fabio Estevam wrote:
> From: Fabio Estevam <festevam@denx.de>
> 
> The i.MX6SX General Purpose Registers is a set of register that serves
> various different purposes and in particular, IOMUXC_GPR_GPR6, at
> offset 0x18, can be used to configure the LDB block.
> 
> Signed-off-by: Fabio Estevam <festevam@denx.de>
> ---
> Changes since v2:
> - Newly introduced.
> 
>  .../bindings/soc/imx/fsl,imx6sx-gpr.yaml      | 83 +++++++++++++++++++
>  1 file changed, 83 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/imx/fsl,imx6sx-gpr.yaml
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
Documentation/devicetree/bindings/soc/imx/fsl,imx6sx-gpr.example.dtb: /example-0/iomuxc-gpr@20e4000: failed to match any schema with compatible: ['fsl,imx6sx-iomuxc-gpr', 'fsl,imx6q-iomuxc-gpr', 'syscon']
Documentation/devicetree/bindings/soc/imx/fsl,imx6sx-gpr.example.dtb: /example-0/iomuxc-gpr@20e4000: failed to match any schema with compatible: ['fsl,imx6sx-iomuxc-gpr', 'fsl,imx6q-iomuxc-gpr', 'syscon']

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20230519112914.309669-2-festevam@gmail.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.

[PATCH v3 3/4] ARM: dts: imx6sx: Add LDB support

[Fabio Estevam]

From: Fabio Estevam <festevam@denx.de>

i.MX6SX has an LVDS controller that is connected to the eLCDIF.

Add support for it.

Signed-off-by: Fabio Estevam <festevam@denx.de>
---
Changes since v2:
- None.

 arch/arm/boot/dts/imx6sx.dtsi | 39 +++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/arch/arm/boot/dts/imx6sx.dtsi b/arch/arm/boot/dts/imx6sx.dtsi
index 4233943a1cca..442106565025 100644
--- a/arch/arm/boot/dts/imx6sx.dtsi
+++ b/arch/arm/boot/dts/imx6sx.dtsi
@@ -844,7 +844,38 @@ iomuxc: pinctrl@20e0000 {
 			gpr: iomuxc-gpr@20e4000 {
 				compatible = "fsl,imx6sx-iomuxc-gpr",
 					     "fsl,imx6q-iomuxc-gpr", "syscon";
+				#address-cells = <1>;
+				#size-cells = <1>;
 				reg = <0x020e4000 0x4000>;
+
+				lvds_bridge: bridge@18 {
+					compatible = "fsl,imx6sx-ldb";
+					reg = <0x18 0x4>;
+					reg-names = "ldb";
+					clocks = <&clks IMX6SX_CLK_LDB_DI0>;
+					clock-names = "ldb";
+					status = "disabled";
+
+					ports {
+						#address-cells = <1>;
+						#size-cells = <0>;
+
+						port@0 {
+							reg = <0>;
+
+							ldb_from_lcdif1: endpoint {
+								remote-endpoint = <&lcdif1_to_ldb>;
+							};
+						};
+
+						port@1 {
+							reg = <1>;
+
+							ldb_lvds_ch0: endpoint {
+							};
+						};
+					};
+				};
 			};
 
 			sdma: dma-controller@20ec000 {
@@ -1278,6 +1309,14 @@ lcdif1: lcdif@2220000 {
 					clock-names = "pix", "axi", "disp_axi";
 					power-domains = <&pd_disp>;
 					status = "disabled";
+
+					ports {
+						port {
+							lcdif1_to_ldb: endpoint {
+								remote-endpoint = <&ldb_from_lcdif1>;
+							};
+						};
+					};
 				};
 
 				lcdif2: lcdif@2224000 {
-- 
2.34.1

[PATCH v3 4/4] soc: imx: imx6sx-gpr: Introduce a GPR driver

[Fabio Estevam]

From: Fabio Estevam <festevam@denx.de>

The motivation for this imx6sx-gpr driver is to allow describing
the LVDS LDB bridge as a GPR subnode.

Signed-off-by: Fabio Estevam <festevam@denx.de>
---
Changes since v2:
- None.

 drivers/soc/imx/Makefile     |  1 +
 drivers/soc/imx/imx6sx-gpr.c | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 drivers/soc/imx/imx6sx-gpr.c

diff --git a/drivers/soc/imx/Makefile b/drivers/soc/imx/Makefile
index a28c44a1f16a..9840d4c41015 100644
--- a/drivers/soc/imx/Makefile
+++ b/drivers/soc/imx/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_ARCH_MXC) += soc-imx.o
 endif
 obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o
 obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) += gpcv2.o
+obj-$(CONFIG_SOC_IMX6SX) += imx6sx-gpr.o
 obj-$(CONFIG_SOC_IMX8M) += soc-imx8m.o
 obj-$(CONFIG_IMX8M_BLK_CTRL) += imx8m-blk-ctrl.o
 obj-$(CONFIG_IMX8M_BLK_CTRL) += imx8mp-blk-ctrl.o
diff --git a/drivers/soc/imx/imx6sx-gpr.c b/drivers/soc/imx/imx6sx-gpr.c
new file mode 100644
index 000000000000..7684acbe43ff
--- /dev/null
+++ b/drivers/soc/imx/imx6sx-gpr.c
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+static int imx6sx_gpr_probe(struct platform_device *pdev)
+{
+	return devm_of_platform_populate(&pdev->dev);
+}
+
+static const struct of_device_id imx6sx_gpr_ids[] = {
+	{ .compatible = "fsl,imx6sx-iomuxc-gpr" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, imx6sx_gpr_ids);
+
+static struct platform_driver imx6sx_gpr_driver = {
+	.driver = {
+		.name	= "imx6sx_gpr",
+		.of_match_table = imx6sx_gpr_ids,
+	},
+	.probe = imx6sx_gpr_probe,
+};
+module_platform_driver(imx6sx_gpr_driver);
+
+MODULE_AUTHOR("Fabio Estevam <festevam@denx.de>");
+MODULE_DESCRIPTION("NXP i.MX6SX GPR driver");
+MODULE_LICENSE("GPL");
-- 
2.34.1