[PATCH v2 4/9] drm/komeda: Add DT parsing

james qian wang (Arm Technology China)
2018-12-19T12:33:51Z

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"

+static int komeda_parse_pipe_dt(struct komeda_dev *mdev, struct device_node *np)
+{
+ struct komeda_pipeline *pipe;
+ struct clk *clk;
+ u32 pipe_id;
+ int ret = 0;
+
+ ret = of_property_read_u32(np, "reg", &pipe_id);
+ if (ret != 0 || pipe_id >= mdev->n_pipelines)
+ return -EINVAL;
+
+ pipe = mdev->pipelines[pipe_id];
+
+ clk = 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 = clk;
+
+ clk = 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 = clk;
+
+ /* enum ports */
+ pipe->of_output_dev = of_graph_get_remote_node(np, KOMEDA_OF_PORT_OUTPUT, 0);
+ pipe->of_output_port = of_graph_get_port_by_id(np, KOMEDA_OF_PORT_OUTPUT);
+
+ pipe->of_node = np;
+
+ return 0;
+}
+
+static int komeda_parse_dt(struct device *dev, struct komeda_dev *mdev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct device_node *child, *np = dev->of_node;
+ struct clk *clk;
+ int ret;
+
+ clk = devm_clk_get(dev, "mclk");
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ mdev->mclk = clk;
+ mdev->irq = 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") == 0) {
+ ret = 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 = to_platform_device(dev);
@@ -74,6 +142,12 @@ struct komeda_dev *komeda_dev_create(struct device *dev)
goto err_cleanup;
}

+ err = komeda_parse_dt(dev, mdev);
+ if (err) {
+ DRM_ERROR("parse device tree failed.\n");
+ goto err_cleanup;
+ }
+
return mdev;

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;

+ /** @irq: irq number */
+ u32 irq;
+
int n_pipelines;
struct komeda_pipeline *pipelines[KOMEDA_MAX_PIPELINES];

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);

+ 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);
}

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;
};

/**
--
2.17.1