[PATCH 13/15] media: stm32: dcmipp: add core support for the stm32mp25

[Alain Volmat <alain.volmat@foss.st.com>]

The stm32mp25 supports both parallel & csi inputs.
An additional clock control is necessary.
Skeleton of the subdev structures for the stm32mp25 is added,
identical for the time being to the stm32mp13 however more subdeves
will be added in further commits.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
---
 .../platform/st/stm32/stm32-dcmipp/dcmipp-core.c   | 98 ++++++++++++++++++----
 1 file changed, 80 insertions(+), 18 deletions(-)

diff --git a/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c b/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c
index d2cc19bb40d7..0087f9017f02 100644
--- a/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c
+++ b/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c
@@ -40,6 +40,7 @@ struct dcmipp_device {
 
 	/* Hardware resources */
 	void __iomem			*regs;
+	struct clk			*mclk;
 	struct clk			*kclk;
 
 	/* The pipeline configuration */
@@ -132,6 +133,40 @@ static const struct dcmipp_pipeline_config stm32mp13_pipe_cfg = {
 	.hw_revision	= DCMIPP_STM32MP13_VERR
 };
 
+static const struct dcmipp_ent_config stm32mp25_ent_config[] = {
+	{
+		.name = "dcmipp_input",
+		.init = dcmipp_inp_ent_init,
+		.release = dcmipp_inp_ent_release,
+	},
+	{
+		.name = "dcmipp_dump_postproc",
+		.init = dcmipp_byteproc_ent_init,
+		.release = dcmipp_byteproc_ent_release,
+	},
+	{
+		.name = "dcmipp_dump_capture",
+		.init = dcmipp_bytecap_ent_init,
+		.release = dcmipp_bytecap_ent_release,
+	},
+};
+
+static const struct dcmipp_ent_link stm32mp25_ent_links[] = {
+	DCMIPP_ENT_LINK(ID_INPUT, 1, ID_DUMP_BYTEPROC, 0,
+			MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
+	DCMIPP_ENT_LINK(ID_DUMP_BYTEPROC, 1, ID_DUMP_CAPTURE,  0,
+			MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
+};
+
+#define DCMIPP_STM32MP25_VERR  0x30
+static const struct dcmipp_pipeline_config stm32mp25_pipe_cfg = {
+	.ents		= stm32mp25_ent_config,
+	.num_ents	= ARRAY_SIZE(stm32mp25_ent_config),
+	.links		= stm32mp25_ent_links,
+	.num_links	= ARRAY_SIZE(stm32mp25_ent_links),
+	.hw_revision    = DCMIPP_STM32MP25_VERR
+};
+
 #define LINK_FLAG_TO_STR(f) ((f) == 0 ? "" :\
 			     (f) == MEDIA_LNK_FL_ENABLED ? "ENABLED" :\
 			     (f) == MEDIA_LNK_FL_IMMUTABLE ? "IMMUTABLE" :\
@@ -212,6 +247,7 @@ static int dcmipp_create_subdevs(struct dcmipp_device *dcmipp)
 
 static const struct of_device_id dcmipp_of_match[] = {
 	{ .compatible = "st,stm32mp13-dcmipp", .data = &stm32mp13_pipe_cfg },
+	{ .compatible = "st,stm32mp25-dcmipp", .data = &stm32mp25_pipe_cfg },
 	{ /* end node */ },
 };
 MODULE_DEVICE_TABLE(of, dcmipp_of_match);
@@ -261,13 +297,22 @@ static int dcmipp_graph_notify_bound(struct v4l2_async_notifier *notifier,
 {
 	struct dcmipp_device *dcmipp = notifier_to_dcmipp(notifier);
 	unsigned int ret;
-	int src_pad;
+	int src_pad, i;
 	struct dcmipp_ent_device *sink;
-	struct v4l2_fwnode_endpoint vep = { .bus_type = V4L2_MBUS_PARALLEL };
+	struct v4l2_fwnode_endpoint vep = { 0 };
 	struct fwnode_handle *ep;
+	enum v4l2_mbus_type supported_types[] = {
+		V4L2_MBUS_PARALLEL, V4L2_MBUS_BT656, V4L2_MBUS_CSI2_DPHY
+	};
+	int supported_types_nb = ARRAY_SIZE(supported_types);
 
 	dev_dbg(dcmipp->dev, "Subdev \"%s\" bound\n", subdev->name);
 
+	/* Only MP25 supports CSI input */
+	if (!of_device_is_compatible(dcmipp->dev->of_node,
+				     "st,stm32mp25-dcmipp"))
+		supported_types_nb--;
+
 	/*
 	 * Link this sub-device to DCMIPP, it could be
 	 * a parallel camera sensor or a CSI-2 to parallel bridge
@@ -284,21 +329,23 @@ static int dcmipp_graph_notify_bound(struct v4l2_async_notifier *notifier,
 		return -ENODEV;
 	}
 
-	/* Check for parallel bus-type first, then bt656 */
-	ret = v4l2_fwnode_endpoint_parse(ep, &vep);
-	if (ret) {
-		vep.bus_type = V4L2_MBUS_BT656;
+	/* Check for supported MBUS type */
+	for (i = 0; i < supported_types_nb; i++) {
+		vep.bus_type = supported_types[i];
 		ret = v4l2_fwnode_endpoint_parse(ep, &vep);
-		if (ret) {
-			dev_err(dcmipp->dev, "Could not parse the endpoint\n");
-			fwnode_handle_put(ep);
-			return ret;
-		}
+		if (!ret)
+			break;
 	}
 
 	fwnode_handle_put(ep);
 
-	if (vep.bus.parallel.bus_width == 0) {
+	if (ret) {
+		dev_err(dcmipp->dev, "Could not parse the endpoint\n");
+		return ret;
+	}
+
+	if (vep.bus_type != V4L2_MBUS_CSI2_DPHY &&
+	    vep.bus.parallel.bus_width == 0) {
 		dev_err(dcmipp->dev, "Invalid parallel interface bus-width\n");
 		return -ENODEV;
 	}
@@ -311,11 +358,13 @@ static int dcmipp_graph_notify_bound(struct v4l2_async_notifier *notifier,
 		return -ENODEV;
 	}
 
-	/* Parallel input device detected, connect it to parallel subdev */
+	/* Connect input device to the dcmipp_input subdev */
 	sink = dcmipp->entity[ID_INPUT];
-	sink->bus.flags = vep.bus.parallel.flags;
-	sink->bus.bus_width = vep.bus.parallel.bus_width;
-	sink->bus.data_shift = vep.bus.parallel.data_shift;
+	if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) {
+		sink->bus.flags = vep.bus.parallel.flags;
+		sink->bus.bus_width = vep.bus.parallel.bus_width;
+		sink->bus.data_shift = vep.bus.parallel.data_shift;
+	}
 	sink->bus_type = vep.bus_type;
 	ret = media_create_pad_link(&subdev->entity, src_pad, sink->ent, 0,
 				    MEDIA_LNK_FL_IMMUTABLE |
@@ -414,7 +463,7 @@ static int dcmipp_graph_init(struct dcmipp_device *dcmipp)
 static int dcmipp_probe(struct platform_device *pdev)
 {
 	struct dcmipp_device *dcmipp;
-	struct clk *kclk;
+	struct clk *kclk, *mclk;
 	const struct dcmipp_pipeline_config *pipe_cfg;
 	struct reset_control *rstc;
 	int irq;
@@ -474,12 +523,20 @@ static int dcmipp_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	kclk = devm_clk_get(&pdev->dev, NULL);
+	kclk = devm_clk_get(&pdev->dev, "kclk");
 	if (IS_ERR(kclk))
 		return dev_err_probe(&pdev->dev, PTR_ERR(kclk),
 				     "Unable to get kclk\n");
 	dcmipp->kclk = kclk;
 
+	if (!of_device_is_compatible(pdev->dev.of_node, "st,stm32mp13-dcmipp")) {
+		mclk = devm_clk_get(&pdev->dev, "mclk");
+		if (IS_ERR(mclk))
+			return dev_err_probe(&pdev->dev, PTR_ERR(mclk),
+					     "Unable to get mclk\n");
+		dcmipp->mclk = mclk;
+	}
+
 	dcmipp->entity = devm_kcalloc(&pdev->dev, dcmipp->pipe_cfg->num_ents,
 				      sizeof(*dcmipp->entity), GFP_KERNEL);
 	if (!dcmipp->entity)
@@ -542,6 +599,7 @@ static int dcmipp_runtime_suspend(struct device *dev)
 	struct dcmipp_device *dcmipp = dev_get_drvdata(dev);
 
 	clk_disable_unprepare(dcmipp->kclk);
+	clk_disable_unprepare(dcmipp->mclk);
 
 	return 0;
 }
@@ -551,6 +609,10 @@ static int dcmipp_runtime_resume(struct device *dev)
 	struct dcmipp_device *dcmipp = dev_get_drvdata(dev);
 	int ret;
 
+	ret = clk_prepare_enable(dcmipp->mclk);
+	if (ret)
+		dev_err(dev, "%s: Failed to prepare_enable mclk\n", __func__);
+
 	ret = clk_prepare_enable(dcmipp->kclk);
 	if (ret)
 		dev_err(dev, "%s: Failed to prepare_enable kclk\n", __func__);

-- 
2.25.1