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The Tegra CAR (Clock And Reset) module provides control of most clocks and reset signals within the Tegra SoC. This change implements a driver for this module. However, since the module implements multiple kinds of services (clocks, resets, perhaps more), all this driver does is bind various sub-devices, which in turn provide the real services. This driver is essentially an "MFD" (Multi-Function Device) in Linux kernel speak. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
/*
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* Copyright (c) 2016, NVIDIA CORPORATION.
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <common.h>
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#include <dm.h>
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#include <dm/lists.h>
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#include <dm/root.h>
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/**
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* The CAR exposes multiple different services. We create a sub-device for
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* each separate type of service, since each device must be of the appropriate
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* UCLASS.
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*/
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static int tegra_car_bpmp_bind(struct udevice *dev)
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{
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int ret;
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struct udevice *child;
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debug("%s(dev=%p)\n", __func__, dev);
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ret = device_bind_driver_to_node(dev, "tegra_car_clk", "tegra_car_clk",
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dev->of_offset, &child);
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if (ret)
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return ret;
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ret = device_bind_driver_to_node(dev, "tegra_car_reset",
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"tegra_car_reset", dev->of_offset,
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&child);
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if (ret)
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return ret;
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return 0;
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}
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static int tegra_car_bpmp_probe(struct udevice *dev)
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{
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debug("%s(dev=%p)\n", __func__, dev);
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return 0;
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}
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static int tegra_car_bpmp_remove(struct udevice *dev)
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{
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debug("%s(dev=%p)\n", __func__, dev);
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return 0;
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}
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static const struct udevice_id tegra_car_bpmp_ids[] = {
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{ .compatible = "nvidia,tegra20-car" },
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{ .compatible = "nvidia,tegra30-car" },
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{ .compatible = "nvidia,tegra114-car" },
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{ .compatible = "nvidia,tegra124-car" },
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{ .compatible = "nvidia,tegra210-car" },
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{ }
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};
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U_BOOT_DRIVER(tegra_car_bpmp) = {
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.name = "tegra_car",
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.id = UCLASS_MISC,
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.of_match = tegra_car_bpmp_ids,
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.bind = tegra_car_bpmp_bind,
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.probe = tegra_car_bpmp_probe,
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.remove = tegra_car_bpmp_remove,
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};
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