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misc: implement Tegra CAR core driver

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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>
This commit is contained in:
Stephen Warren 2016-09-13 10:45:57 -06:00 committed by Tom Warren
parent d0ad8a5cbf
commit bd3ee84ac7
3 changed files with 76 additions and 0 deletions
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7
drivers/misc/Kconfig
View file

@ -129,6 +129,13 @@ config PCA9551_I2C_ADDR
help
The I2C address of the PCA9551 LED controller.
config TEGRA_CAR
bool "Enable support for the Tegra CAR driver"
depends on TEGRA_NO_BPMP
help
The Tegra CAR (Clock and Reset Controller) is a HW module that
controls almost all clocks and resets in a Tegra SoC.
config TEGRA186_BPMP
bool "Enable support for the Tegra186 BPMP driver"
depends on TEGRA186

1
drivers/misc/Makefile
View file

@ -42,6 +42,7 @@ obj-$(CONFIG_SANDBOX) += spltest_sandbox.o
endif
endif
obj-$(CONFIG_SANDBOX) += syscon_sandbox.o
obj-$(CONFIG_TEGRA_CAR) += tegra_car.o
obj-$(CONFIG_TEGRA186_BPMP) += tegra186_bpmp.o
obj-$(CONFIG_TWL4030_LED) += twl4030_led.o
obj-$(CONFIG_FSL_IFC) += fsl_ifc.o

68
drivers/misc/tegra_car.c Normal file
View file

@ -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,
};