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authorjames qian wang (Arm Technology China) <james.qian.wang@arm.com>2019-01-03 11:40:21 +0000
committerLiviu Dudau <Liviu.Dudau@arm.com>2019-01-14 11:09:23 +0000
commit26bd43a759963981ad685b3ed917abd9c41c65f8 (patch)
treedd3e8bc4bba777e8d22b9e2dfa3ef8c20764a608 /drivers/gpu/drm/arm/display/komeda/komeda_drv.c
parentdf766e4a419c77283485931070e0692f64aebf8a (diff)
drm/komeda: Build komeda to be a platform module
Implement a simple wrapper for platform module to build komeda to module, Also add a very simple D71 layer code to show how to discover a product. Komeda driver direct bind the product ENTRY function xxx_identity to DT compatible name like: d71_product = { .product_id = MALIDP_D71_PRODUCT_ID, .identify = d71_identify, }, const struct of_device_id komeda_of_match[] = { { .compatible = "arm,mali-d71", .data = &d71_product, }, {}, }; Then when linux found a matched DT node and call driver to probe, we can easily get the of data, and call into the product to do the identify: komeda_bind() { ... product = of_device_get_match_data(dev); product->identify(); ... } Changes in v4: - Replaced kzalloc with devm_kzalloc Changes in v3: - Fixed style problem found by checkpatch.pl --strict. Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com> Acked-by: Liviu Dudau <liviu.dudau@arm.com> Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Diffstat (limited to 'drivers/gpu/drm/arm/display/komeda/komeda_drv.c')
-rw-r--r--drivers/gpu/drm/arm/display/komeda/komeda_drv.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
new file mode 100644
index 000000000000..dd386d82d143
--- /dev/null
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
+ * Author: James.Qian.Wang <james.qian.wang@arm.com>
+ *
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/component.h>
+#include <drm/drm_of.h>
+#include "komeda_dev.h"
+
+struct komeda_drv {
+ struct komeda_dev *mdev;
+};
+
+static void komeda_unbind(struct device *dev)
+{
+ struct komeda_drv *mdrv = dev_get_drvdata(dev);
+
+ if (!mdrv)
+ return;
+
+ komeda_dev_destroy(mdrv->mdev);
+
+ dev_set_drvdata(dev, NULL);
+ devm_kfree(dev, mdrv);
+}
+
+static int komeda_bind(struct device *dev)
+{
+ struct komeda_drv *mdrv;
+ int err;
+
+ mdrv = devm_kzalloc(dev, sizeof(*mdrv), GFP_KERNEL);
+ if (!mdrv)
+ return -ENOMEM;
+
+ mdrv->mdev = komeda_dev_create(dev);
+ if (IS_ERR(mdrv->mdev)) {
+ err = PTR_ERR(mdrv->mdev);
+ goto free_mdrv;
+ }
+
+ dev_set_drvdata(dev, mdrv);
+
+ return 0;
+
+free_mdrv:
+ devm_kfree(dev, mdrv);
+ return err;
+}
+
+static const struct component_master_ops komeda_master_ops = {
+ .bind = komeda_bind,
+ .unbind = komeda_unbind,
+};
+
+static int compare_of(struct device *dev, void *data)
+{
+ return dev->of_node == data;
+}
+
+static void komeda_add_slave(struct device *master,
+ struct component_match **match,
+ struct device_node *np, int port)
+{
+ struct device_node *remote;
+
+ remote = of_graph_get_remote_node(np, port, 0);
+ if (remote) {
+ drm_of_component_match_add(master, match, compare_of, remote);
+ of_node_put(remote);
+ }
+}
+
+static int komeda_platform_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct component_match *match = NULL;
+ struct device_node *child;
+
+ if (!dev->of_node)
+ return -ENODEV;
+
+ for_each_available_child_of_node(dev->of_node, child) {
+ if (of_node_cmp(child->name, "pipeline") != 0)
+ continue;
+
+ /* add connector */
+ komeda_add_slave(dev, &match, child, KOMEDA_OF_PORT_OUTPUT);
+ }
+
+ return component_master_add_with_match(dev, &komeda_master_ops, match);
+}
+
+static int komeda_platform_remove(struct platform_device *pdev)
+{
+ component_master_del(&pdev->dev, &komeda_master_ops);
+ return 0;
+}
+
+static const struct komeda_product_data komeda_products[] = {
+ [MALI_D71] = {
+ .product_id = MALIDP_D71_PRODUCT_ID,
+ .identify = d71_identify,
+ },
+};
+
+const struct of_device_id komeda_of_match[] = {
+ { .compatible = "arm,mali-d71", .data = &komeda_products[MALI_D71], },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, komeda_of_match);
+
+static struct platform_driver komeda_platform_driver = {
+ .probe = komeda_platform_probe,
+ .remove = komeda_platform_remove,
+ .driver = {
+ .name = "komeda",
+ .of_match_table = komeda_of_match,
+ .pm = NULL,
+ },
+};
+
+module_platform_driver(komeda_platform_driver);
+
+MODULE_AUTHOR("James.Qian.Wang <james.qian.wang@arm.com>");
+MODULE_DESCRIPTION("Komeda KMS driver");
+MODULE_LICENSE("GPL v2");