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author | Stephen Warren <swarren@nvidia.com> | 2016-09-13 10:45:57 -0600 |
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committer | Tom Warren <twarren@nvidia.com> | 2016-09-27 09:11:02 -0700 |
commit | bd3ee84ac71237656992ae78d0c7dfa7dcb4ceac (patch) | |
tree | 5491295f7139b809d4e9e99071da0d3d58eb71ac /drivers/misc/tegra_car.c | |
parent | d0ad8a5cbfe8d52339ac5bea3617af21d2fd079a (diff) | |
download | u-boot-bd3ee84ac71237656992ae78d0c7dfa7dcb4ceac.zip u-boot-bd3ee84ac71237656992ae78d0c7dfa7dcb4ceac.tar.gz u-boot-bd3ee84ac71237656992ae78d0c7dfa7dcb4ceac.tar.bz2 |
misc: implement Tegra CAR core driver
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>
Diffstat (limited to 'drivers/misc/tegra_car.c')
-rw-r--r-- | drivers/misc/tegra_car.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/misc/tegra_car.c b/drivers/misc/tegra_car.c new file mode 100644 index 0000000..0eb0096 --- /dev/null +++ b/drivers/misc/tegra_car.c @@ -0,0 +1,68 @@ +/* + * Copyright (c) 2016, NVIDIA CORPORATION. + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <common.h> +#include <dm.h> +#include <dm/lists.h> +#include <dm/root.h> + +/** + * The CAR exposes multiple different services. We create a sub-device for + * each separate type of service, since each device must be of the appropriate + * UCLASS. + */ +static int tegra_car_bpmp_bind(struct udevice *dev) +{ + int ret; + struct udevice *child; + + debug("%s(dev=%p)\n", __func__, dev); + + ret = device_bind_driver_to_node(dev, "tegra_car_clk", "tegra_car_clk", + dev->of_offset, &child); + if (ret) + return ret; + + ret = device_bind_driver_to_node(dev, "tegra_car_reset", + "tegra_car_reset", dev->of_offset, + &child); + if (ret) + return ret; + + return 0; +} + +static int tegra_car_bpmp_probe(struct udevice *dev) +{ + debug("%s(dev=%p)\n", __func__, dev); + + return 0; +} + +static int tegra_car_bpmp_remove(struct udevice *dev) +{ + debug("%s(dev=%p)\n", __func__, dev); + + return 0; +} + +static const struct udevice_id tegra_car_bpmp_ids[] = { + { .compatible = "nvidia,tegra20-car" }, + { .compatible = "nvidia,tegra30-car" }, + { .compatible = "nvidia,tegra114-car" }, + { .compatible = "nvidia,tegra124-car" }, + { .compatible = "nvidia,tegra210-car" }, + { } +}; + +U_BOOT_DRIVER(tegra_car_bpmp) = { + .name = "tegra_car", + .id = UCLASS_MISC, + .of_match = tegra_car_bpmp_ids, + .bind = tegra_car_bpmp_bind, + .probe = tegra_car_bpmp_probe, + .remove = tegra_car_bpmp_remove, +}; |