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authorStephen Warren <swarren@nvidia.com>2016-09-13 10:45:57 -0600
committerTom Warren <twarren@nvidia.com>2016-09-27 09:11:02 -0700
commitbd3ee84ac71237656992ae78d0c7dfa7dcb4ceac (patch)
tree5491295f7139b809d4e9e99071da0d3d58eb71ac /drivers
parentd0ad8a5cbfe8d52339ac5bea3617af21d2fd079a (diff)
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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')
-rw-r--r--drivers/misc/Kconfig7
-rw-r--r--drivers/misc/Makefile1
-rw-r--r--drivers/misc/tegra_car.c68
3 files changed, 76 insertions, 0 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 8990489..1aae4bc 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -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
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index e4f2464..9fbb5a7 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -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
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,
+};