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Subject: [PATCH v2 4/9] drm/komeda: Add DT parsing
Thread-Topic: [PATCH v2 4/9] drm/komeda: Add DT parsing
Thread-Index: AQHUl5cUt9ULts/t3UaAJkdKdzOFrQ==
Date:   Wed, 19 Dec 2018 12:33:43 +0000
Message-ID: <20181219123147.16090-5-james.qian.wang@arm.com>
References: <20181219123147.16090-1-james.qian.wang@arm.com>
In-Reply-To: <20181219123147.16090-1-james.qian.wang@arm.com>
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Parse DT and initialize corresponding dev/pipeline attributes.

Signed-off-by: James (Qian) Wang <james.qian.wang@arm.com>
---
 .../gpu/drm/arm/display/komeda/komeda_dev.c   | 74 +++++++++++++++++++
 .../gpu/drm/arm/display/komeda/komeda_dev.h   |  3 +
 .../drm/arm/display/komeda/komeda_pipeline.c  |  4 +
 .../drm/arm/display/komeda/komeda_pipeline.h  |  7 ++
 4 files changed, 88 insertions(+)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c b/drivers/gpu/=
drm/arm/display/komeda/komeda_dev.c
index 887a17005367..214ef75e0e24 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
@@ -12,6 +12,74 @@
 #include <linux/version.h>
 #include "komeda_dev.h"
=20
+static int komeda_parse_pipe_dt(struct komeda_dev *mdev, struct device_nod=
e *np)
+{
+	struct komeda_pipeline *pipe;
+	struct clk *clk;
+	u32 pipe_id;
+	int ret =3D 0;
+
+	ret =3D of_property_read_u32(np, "reg", &pipe_id);
+	if (ret !=3D 0 || pipe_id >=3D mdev->n_pipelines)
+		return -EINVAL;
+
+	pipe =3D mdev->pipelines[pipe_id];
+
+	clk =3D of_clk_get_by_name(np, "aclk");
+	if (IS_ERR(clk)) {
+		DRM_ERROR("get aclk for pipeline %d failed!\n", pipe_id);
+		return PTR_ERR(clk);
+	}
+	pipe->aclk =3D clk;
+
+	clk =3D of_clk_get_by_name(np, "pxclk");
+	if (IS_ERR(clk)) {
+		DRM_ERROR("get pxclk for pipeline %d failed!\n", pipe_id);
+		return PTR_ERR(clk);
+	}
+	pipe->pxlclk =3D clk;
+
+	/* enum ports */
+	pipe->of_output_dev  =3D of_graph_get_remote_node(np, KOMEDA_OF_PORT_OUTP=
UT, 0);
+	pipe->of_output_port =3D of_graph_get_port_by_id(np, KOMEDA_OF_PORT_OUTPU=
T);
+
+	pipe->of_node =3D np;
+
+	return 0;
+}
+
+static int komeda_parse_dt(struct device *dev, struct komeda_dev *mdev)
+{
+	struct platform_device *pdev =3D to_platform_device(dev);
+	struct device_node *child, *np =3D dev->of_node;
+	struct clk *clk;
+	int ret;
+
+	clk =3D devm_clk_get(dev, "mclk");
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	mdev->mclk =3D clk;
+	mdev->irq  =3D platform_get_irq_byname(pdev, "DPU");
+	if (mdev->irq < 0) {
+		DRM_ERROR("could not get IRQ number.\n");
+		return mdev->irq;
+	}
+
+	for_each_available_child_of_node(np, child) {
+		if (of_node_cmp(child->name, "pipeline") =3D=3D 0) {
+			ret =3D komeda_parse_pipe_dt(mdev, child);
+			if (ret) {
+				DRM_ERROR("parse pipeline dt error!\n");
+				of_node_put(child);
+				break;
+			}
+		}
+	}
+
+	return ret;
+}
+
 struct komeda_dev *komeda_dev_create(struct device *dev)
 {
 	struct platform_device *pdev =3D to_platform_device(dev);
@@ -74,6 +142,12 @@ struct komeda_dev *komeda_dev_create(struct device *dev=
)
 		goto err_cleanup;
 	}
=20
+	err =3D komeda_parse_dt(dev, mdev);
+	if (err) {
+		DRM_ERROR("parse device tree failed.\n");
+		goto err_cleanup;
+	}
+
 	return mdev;
=20
 err_cleanup:
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.h b/drivers/gpu/=
drm/arm/display/komeda/komeda_dev.h
index 680e3e2cf100..4a27a44e2ec6 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.h
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.h
@@ -72,6 +72,9 @@ struct komeda_dev {
 	/** @mck: HW main engine clk */
 	struct clk *mclk;
=20
+	/** @irq: irq number */
+	u32 irq;
+
 	int n_pipelines;
 	struct komeda_pipeline *pipelines[KOMEDA_MAX_PIPELINES];
=20
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c b/drivers=
/gpu/drm/arm/display/komeda/komeda_pipeline.c
index 10378df8e5a8..2f36b6bd8282 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c
@@ -55,6 +55,10 @@ void komeda_pipeline_destroy(struct komeda_dev *mdev,
 	clk_put(pipe->pxlclk);
 	clk_put(pipe->aclk);
=20
+	of_node_put(pipe->of_output_dev);
+	of_node_put(pipe->of_output_port);
+	of_node_put(pipe->of_node);
+
 	devm_kfree(mdev->dev, pipe);
 }
=20
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h b/drivers=
/gpu/drm/arm/display/komeda/komeda_pipeline.h
index eea1e64c4624..e097d4fcb2c5 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
@@ -286,6 +286,13 @@ struct komeda_pipeline {
 	struct komeda_improc *improc;
 	struct komeda_timing_ctrlr *ctrlr;
 	struct komeda_pipeline_funcs *funcs; /* private pipeline functions */
+
+	/** @of_node: pipeline dt node */
+	struct device_node *of_node;
+	/** @of_output_port: pipeline output port */
+	struct device_node *of_output_port;
+	/** @of_output_dev: output connector device node */
+	struct device_node *of_output_dev;
 };
=20
 /**
--=20
2.17.1