From 26bd43a759963981ad685b3ed917abd9c41c65f8 Mon Sep 17 00:00:00 2001 From: "james qian wang (Arm Technology China)" Date: Thu, 3 Jan 2019 11:40:21 +0000 Subject: 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) Acked-by: Liviu Dudau Signed-off-by: Liviu Dudau --- drivers/gpu/drm/arm/display/komeda/komeda_drv.c | 132 ++++++++++++++++++++++++ 1 file changed, 132 insertions(+) create mode 100644 drivers/gpu/drm/arm/display/komeda/komeda_drv.c (limited to 'drivers/gpu/drm/arm/display/komeda/komeda_drv.c') 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 + * + */ +#include +#include +#include +#include +#include +#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 "); +MODULE_DESCRIPTION("Komeda KMS driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3-59-g8ed1b