[U-Boot] [PATCH V3] gpio: add Tegra186 GPIO driver
Stephen Warren
swarren at wwwdotorg.org
Wed May 25 22:38:51 CEST 2016
From: Stephen Warren <swarren at nvidia.com>
Tegra186's GPIO controller register layout is significantly different from
previous chips, so add a new driver for it. In fact, there are two
different GPIO controllers in Tegra186 that share a similar register
layout, but very different port mapping. This driver covers both.
The DT binding is already present in the Linux kernel (in linux-next via
the Tegra tree so far).
Signed-off-by: Stephen Warren <swarren at nvidia.com>
Reviewed-by: Simon Glass <sjg at chromium.org> # v1
---
v3:
* Fix register offsets above 0xc; they were shifted by one.
* GPIO_OUTPUT_CONTROL_DRIVEN is actually _FLOATED.
* ENABLE_CONFIG register also needs programming to enable GPIOs and set
their direction.
* The OUTPUT_VALUE register must be used to read the value of an output
GPIO; the INPUT register doesn't work for them.
* Now tested on output GPIOs too; previously only tested in inputs, for
which none of the above had any effect.
* Chastised myself for bugs.
v2:
* Add DT binding document.
* Remove HAS_TEGRA186_GPIO Kconfig option so that the driver can be
compile-tested irrespective of Tegra SoC selection.
* Fix tegra186_gpio_get_value() to read the input register not the output.
* Fix tegra186_gpio_get_value() to always return 0 or 1.
* Fix a compile warning comparing FDT_ADDR_T_NONE to a pointer.
* Update FIXME comments in the commit description; the related kernel
commits have been applied, so the binding is final.
---
.../gpio/nvidia,tegra186-gpio.txt | 161 ++++++++++++
drivers/gpio/Kconfig | 8 +
drivers/gpio/Makefile | 1 +
drivers/gpio/rk_gpio.c | 1 -
drivers/gpio/tegra186_gpio.c | 288 +++++++++++++++++++++
drivers/gpio/tegra186_gpio_priv.h | 61 +++++
include/dt-bindings/gpio/tegra186-gpio.h | 60 +++++
7 files changed, 579 insertions(+), 1 deletion(-)
create mode 100644 doc/device-tree-bindings/gpio/nvidia,tegra186-gpio.txt
create mode 100644 drivers/gpio/tegra186_gpio.c
create mode 100644 drivers/gpio/tegra186_gpio_priv.h
create mode 100644 include/dt-bindings/gpio/tegra186-gpio.h
diff --git a/doc/device-tree-bindings/gpio/nvidia,tegra186-gpio.txt b/doc/device-tree-bindings/gpio/nvidia,tegra186-gpio.txt
new file mode 100644
index 000000000000..c82a2e221bc1
--- /dev/null
+++ b/doc/device-tree-bindings/gpio/nvidia,tegra186-gpio.txt
@@ -0,0 +1,161 @@
+NVIDIA Tegra186 GPIO controllers
+
+Tegra186 contains two GPIO controllers; a main controller and an "AON"
+controller. This binding document applies to both controllers. The register
+layouts for the controllers share many similarities, but also some significant
+differences. Hence, this document describes closely related but different
+bindings and compatible values.
+
+The Tegra186 GPIO controller allows software to set the IO direction of, and
+read/write the value of, numerous GPIO signals. Routing of GPIO signals to
+package balls is under the control of a separate pin controller HW block. Two
+major sets of registers exist:
+
+a) Security registers, which allow configuration of allowed access to the GPIO
+register set. These registers exist in a single contiguous block of physical
+address space. The size of this block, and the security features available,
+varies between the different GPIO controllers.
+
+Access to this set of registers is not necessary in all circumstances. Code
+that wishes to configure access to the GPIO registers needs access to these
+registers to do so. Code which simply wishes to read or write GPIO data does not
+need access to these registers.
+
+b) GPIO registers, which allow manipulation of the GPIO signals. In some GPIO
+controllers, these registers are exposed via multiple "physical aliases" in
+address space, each of which access the same underlying state. See the hardware
+documentation for rationale. Any particular GPIO client is expected to access
+just one of these physical aliases.
+
+Tegra HW documentation describes a unified naming convention for all GPIOs
+implemented by the SoC. Each GPIO is assigned to a port, and a port may control
+a number of GPIOs. Thus, each GPIO is named according to an alphabetical port
+name and an integer GPIO name within the port. For example, GPIO_PA0, GPIO_PN6,
+or GPIO_PCC3.
+
+The number of ports implemented by each GPIO controller varies. The number of
+implemented GPIOs within each port varies. GPIO registers within a controller
+are grouped and laid out according to the port they affect.
+
+The mapping from port name to the GPIO controller that implements that port, and
+the mapping from port name to register offset within a controller, are both
+extremely non-linear. The header file <dt-bindings/gpio/tegra186-gpio.h>
+describes the port-level mapping. In that file, the naming convention for ports
+matches the HW documentation. The values chosen for the names are alphabetically
+sorted within a particular controller. Drivers need to map between the DT GPIO
+IDs and HW register offsets using a lookup table.
+
+Each GPIO controller can generate a number of interrupt signals. Each signal
+represents the aggregate status for all GPIOs within a set of ports. Thus, the
+number of interrupt signals generated by a controller varies as a rough function
+of the number of ports it implements. Note that the HW documentation refers to
+both the overall controller HW module and the sets-of-ports as "controllers".
+
+Each GPIO controller in fact generates multiple interrupts signals for each set
+of ports. Each GPIO may be configured to feed into a specific one of the
+interrupt signals generated by a set-of-ports. The intent is for each generated
+signal to be routed to a different CPU, thus allowing different CPUs to each
+handle subsets of the interrupts within a port. The status of each of these
+per-port-set signals is reported via a separate register. Thus, a driver needs
+to know which status register to observe. This binding currently defines no
+configuration mechanism for this. By default, drivers should use register
+GPIO_${port}_INTERRUPT_STATUS_G1_0. Future revisions to the binding could
+define a property to configure this.
+
+Required properties:
+- compatible
+ Array of strings.
+ One of:
+ - "nvidia,tegra186-gpio".
+ - "nvidia,tegra186-gpio-aon".
+- reg-names
+ Array of strings.
+ Contains a list of names for the register spaces described by the reg
+ property. May contain the following entries, in any order:
+ - "gpio": Mandatory. GPIO control registers. This may cover either:
+ a) The single physical alias that this OS should use.
+ b) All physical aliases that exist in the controller. This is
+ appropriate when the OS is responsible for managing assignment of
+ the physical aliases.
+ - "security": Optional. Security configuration registers.
+ Users of this binding MUST look up entries in the reg property by name,
+ using this reg-names property to do so.
+- reg
+ Array of (physical base address, length) tuples.
+ Must contain one entry per entry in the reg-names property, in a matching
+ order.
+- interrupts
+ Array of interrupt specifiers.
+ The interrupt outputs from the HW block, one per set of ports, in the
+ order the HW manual describes them. The number of entries required varies
+ depending on compatible value:
+ - "nvidia,tegra186-gpio": 6 entries.
+ - "nvidia,tegra186-gpio-aon": 1 entry.
+- gpio-controller
+ Boolean.
+ Marks the device node as a GPIO controller/provider.
+- #gpio-cells
+ Single-cell integer.
+ Must be <2>.
+ Indicates how many cells are used in a consumer's GPIO specifier.
+ In the specifier:
+ - The first cell is the pin number.
+ See <dt-bindings/gpio/tegra186-gpio.h>.
+ - The second cell contains flags:
+ - Bit 0 specifies polarity
+ - 0: Active-high (normal).
+ - 1: Active-low (inverted).
+- interrupt-controller
+ Boolean.
+ Marks the device node as an interrupt controller/provider.
+- #interrupt-cells
+ Single-cell integer.
+ Must be <2>.
+ Indicates how many cells are used in a consumer's interrupt specifier.
+ In the specifier:
+ - The first cell is the GPIO number.
+ See <dt-bindings/gpio/tegra186-gpio.h>.
+ - The second cell is contains flags:
+ - Bits [3:0] indicate trigger type and level:
+ - 1: Low-to-high edge triggered.
+ - 2: High-to-low edge triggered.
+ - 4: Active high level-sensitive.
+ - 8: Active low level-sensitive.
+ Valid combinations are 1, 2, 3, 4, 8.
+
+Example:
+
+#include <dt-bindings/interrupt-controller/irq.h>
+
+gpio at 2200000 {
+ compatible = "nvidia,tegra186-gpio";
+ reg-names = "security", "gpio";
+ reg =
+ <0x0 0x2200000 0x0 0x10000>,
+ <0x0 0x2210000 0x0 0x10000>;
+ interrupts =
+ <0 47 IRQ_TYPE_LEVEL_HIGH>,
+ <0 50 IRQ_TYPE_LEVEL_HIGH>,
+ <0 53 IRQ_TYPE_LEVEL_HIGH>,
+ <0 56 IRQ_TYPE_LEVEL_HIGH>,
+ <0 59 IRQ_TYPE_LEVEL_HIGH>,
+ <0 180 IRQ_TYPE_LEVEL_HIGH>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+};
+
+gpio at c2f0000 {
+ compatible = "nvidia,tegra186-gpio-aon";
+ reg-names = "security", "gpio";
+ reg =
+ <0x0 0xc2f0000 0x0 0x1000>,
+ <0x0 0xc2f1000 0x0 0x1000>;
+ interrupts =
+ <0 60 IRQ_TYPE_LEVEL_HIGH>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+};
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index b3e086fa3584..6883f15d8c33 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -116,6 +116,14 @@ config TEGRA_GPIO
Support for the GPIO controller contained in NVIDIA Tegra20 through
Tegra210.
+config TEGRA186_GPIO
+ bool "Tegra186 GPIO driver"
+ depends on DM_GPIO
+ help
+ Support for the GPIO controller contained in NVIDIA Tegra186. This
+ covers both the "main" and "AON" controller instances, even though
+ they have slightly different register layout.
+
config GPIO_UNIPHIER
bool "UniPhier GPIO"
depends on ARCH_UNIPHIER
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 4f071c451727..b1c0b39ac8a0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_S5P) += s5p_gpio.o
obj-$(CONFIG_SANDBOX_GPIO) += sandbox.o
obj-$(CONFIG_SPEAR_GPIO) += spear_gpio.o
obj-$(CONFIG_TEGRA_GPIO) += tegra_gpio.o
+obj-$(CONFIG_TEGRA186_GPIO) += tegra186_gpio.o
obj-$(CONFIG_DA8XX_GPIO) += da8xx_gpio.o
obj-$(CONFIG_DM644X_GPIO) += da8xx_gpio.o
obj-$(CONFIG_ALTERA_PIO) += altera_pio.o
diff --git a/drivers/gpio/rk_gpio.c b/drivers/gpio/rk_gpio.c
index 40e87bd1996a..9d583af64739 100644
--- a/drivers/gpio/rk_gpio.c
+++ b/drivers/gpio/rk_gpio.c
@@ -8,7 +8,6 @@
*/
#include <common.h>
-#include <clk.h>
#include <dm.h>
#include <syscon.h>
#include <asm/errno.h>
diff --git a/drivers/gpio/tegra186_gpio.c b/drivers/gpio/tegra186_gpio.c
new file mode 100644
index 000000000000..1c681514db9f
--- /dev/null
+++ b/drivers/gpio/tegra186_gpio.c
@@ -0,0 +1,288 @@
+/*
+ * Copyright (c) 2010-2016, NVIDIA CORPORATION.
+ * (based on tegra_gpio.c)
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <malloc.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <asm/io.h>
+#include <asm/bitops.h>
+#include <asm/gpio.h>
+#include <dm/device-internal.h>
+#include <dt-bindings/gpio/gpio.h>
+#include "tegra186_gpio_priv.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct tegra186_gpio_port_data {
+ const char *name;
+ uint32_t offset;
+};
+
+struct tegra186_gpio_ctlr_data {
+ const struct tegra186_gpio_port_data *ports;
+ uint32_t port_count;
+};
+
+struct tegra186_gpio_platdata {
+ const char *name;
+ uint32_t *regs;
+};
+
+static uint32_t *tegra186_gpio_reg(struct udevice *dev, uint32_t reg,
+ uint32_t gpio)
+{
+ struct tegra186_gpio_platdata *plat = dev->platdata;
+ uint32_t index = (reg + (gpio * TEGRA186_GPIO_PER_GPIO_STRIDE)) / 4;
+
+ return &(plat->regs[index]);
+}
+
+static int tegra186_gpio_set_out(struct udevice *dev, unsigned offset,
+ bool output)
+{
+ uint32_t *reg;
+ uint32_t rval;
+
+ reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_CONTROL, offset);
+ rval = readl(reg);
+ if (output)
+ rval &= ~TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
+ else
+ rval |= TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
+ writel(rval, reg);
+
+ reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
+ rval = readl(reg);
+ if (output)
+ rval |= TEGRA186_GPIO_ENABLE_CONFIG_OUT;
+ else
+ rval &= ~TEGRA186_GPIO_ENABLE_CONFIG_OUT;
+ rval |= TEGRA186_GPIO_ENABLE_CONFIG_ENABLE;
+ writel(rval, reg);
+
+ return 0;
+}
+
+static int tegra186_gpio_set_val(struct udevice *dev, unsigned offset, bool val)
+{
+ uint32_t *reg;
+ uint32_t rval;
+
+ reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE, offset);
+ rval = readl(reg);
+ if (val)
+ rval |= TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
+ else
+ rval &= ~TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
+ writel(rval, reg);
+
+ return 0;
+}
+
+static int tegra186_gpio_direction_input(struct udevice *dev, unsigned offset)
+{
+ return tegra186_gpio_set_out(dev, offset, false);
+}
+
+static int tegra186_gpio_direction_output(struct udevice *dev, unsigned offset,
+ int value)
+{
+ int ret;
+
+ ret = tegra186_gpio_set_val(dev, offset, value != 0);
+ if (ret)
+ return ret;
+ return tegra186_gpio_set_out(dev, offset, true);
+}
+
+static int tegra186_gpio_get_value(struct udevice *dev, unsigned offset)
+{
+ uint32_t *reg;
+ uint32_t rval;
+
+ reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
+ rval = readl(reg);
+
+ if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
+ reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE,
+ offset);
+ else
+ reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_INPUT, offset);
+
+ rval = readl(reg);
+ return !!rval;
+}
+
+static int tegra186_gpio_set_value(struct udevice *dev, unsigned offset,
+ int value)
+{
+ return tegra186_gpio_set_val(dev, offset, value != 0);
+}
+
+static int tegra186_gpio_get_function(struct udevice *dev, unsigned offset)
+{
+ uint32_t *reg;
+ uint32_t rval;
+
+ reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
+ rval = readl(reg);
+ if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
+ return GPIOF_OUTPUT;
+ else
+ return GPIOF_INPUT;
+}
+
+static int tegra186_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
+ struct fdtdec_phandle_args *args)
+{
+ int gpio, port, ret;
+
+ gpio = args->args[0];
+ port = gpio / TEGRA186_GPIO_PER_GPIO_COUNT;
+ ret = device_get_child(dev, port, &desc->dev);
+ if (ret)
+ return ret;
+ desc->offset = gpio % TEGRA186_GPIO_PER_GPIO_COUNT;
+ desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
+
+ return 0;
+}
+
+static const struct dm_gpio_ops tegra186_gpio_ops = {
+ .direction_input = tegra186_gpio_direction_input,
+ .direction_output = tegra186_gpio_direction_output,
+ .get_value = tegra186_gpio_get_value,
+ .set_value = tegra186_gpio_set_value,
+ .get_function = tegra186_gpio_get_function,
+ .xlate = tegra186_gpio_xlate,
+};
+
+/**
+ * We have a top-level GPIO device with no actual GPIOs. It has a child device
+ * for each port within the controller.
+ */
+static int tegra186_gpio_bind(struct udevice *parent)
+{
+ struct tegra186_gpio_platdata *parent_plat = parent->platdata;
+ struct tegra186_gpio_ctlr_data *ctlr_data =
+ (struct tegra186_gpio_ctlr_data *)dev_get_driver_data(parent);
+ uint32_t *regs;
+ int port, ret;
+
+ /* If this is a child device, there is nothing to do here */
+ if (parent_plat)
+ return 0;
+
+ regs = (uint32_t *)dev_get_addr_name(parent, "gpio");
+ if (regs == (uint32_t *)FDT_ADDR_T_NONE)
+ return -ENODEV;
+
+ for (port = 0; port < ctlr_data->port_count; port++) {
+ struct tegra186_gpio_platdata *plat;
+ struct udevice *dev;
+
+ plat = calloc(1, sizeof(*plat));
+ if (!plat)
+ return -ENOMEM;
+ plat->name = ctlr_data->ports[port].name;
+ plat->regs = &(regs[ctlr_data->ports[port].offset / 4]);
+
+ ret = device_bind(parent, parent->driver, plat->name, plat,
+ -1, &dev);
+ if (ret)
+ return ret;
+ dev->of_offset = parent->of_offset;
+ }
+
+ return 0;
+}
+
+static int tegra186_gpio_probe(struct udevice *dev)
+{
+ struct tegra186_gpio_platdata *plat = dev->platdata;
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+
+ /* Only child devices have ports */
+ if (!plat)
+ return 0;
+
+ uc_priv->gpio_count = TEGRA186_GPIO_PER_GPIO_COUNT;
+ uc_priv->bank_name = plat->name;
+
+ return 0;
+}
+
+static const struct tegra186_gpio_port_data tegra186_gpio_main_ports[] = {
+ {"A", 0x2000},
+ {"B", 0x3000},
+ {"C", 0x3200},
+ {"D", 0x3400},
+ {"E", 0x2200},
+ {"F", 0x2400},
+ {"G", 0x4200},
+ {"H", 0x1000},
+ {"I", 0x0800},
+ {"J", 0x5000},
+ {"K", 0x5200},
+ {"L", 0x1200},
+ {"M", 0x5600},
+ {"N", 0x0000},
+ {"O", 0x0200},
+ {"P", 0x4000},
+ {"Q", 0x0400},
+ {"R", 0x0a00},
+ {"T", 0x0600},
+ {"X", 0x1400},
+ {"Y", 0x1600},
+ {"BB", 0x2600},
+ {"CC", 0x5400},
+};
+
+static const struct tegra186_gpio_ctlr_data tegra186_gpio_main_data = {
+ .ports = tegra186_gpio_main_ports,
+ .port_count = ARRAY_SIZE(tegra186_gpio_main_ports),
+};
+
+static const struct tegra186_gpio_port_data tegra186_gpio_aon_ports[] = {
+ {"S", 0x0200},
+ {"U", 0x0400},
+ {"V", 0x0800},
+ {"W", 0x0a00},
+ {"Z", 0x0e00},
+ {"AA", 0x0c00},
+ {"EE", 0x0600},
+ {"FF", 0x0000},
+};
+
+static const struct tegra186_gpio_ctlr_data tegra186_gpio_aon_data = {
+ .ports = tegra186_gpio_aon_ports,
+ .port_count = ARRAY_SIZE(tegra186_gpio_aon_ports),
+};
+
+static const struct udevice_id tegra186_gpio_ids[] = {
+ {
+ .compatible = "nvidia,tegra186-gpio",
+ .data = (ulong)&tegra186_gpio_main_data,
+ },
+ {
+ .compatible = "nvidia,tegra186-gpio-aon",
+ .data = (ulong)&tegra186_gpio_aon_data,
+ },
+ { }
+};
+
+U_BOOT_DRIVER(tegra186_gpio) = {
+ .name = "tegra186_gpio",
+ .id = UCLASS_GPIO,
+ .of_match = tegra186_gpio_ids,
+ .bind = tegra186_gpio_bind,
+ .probe = tegra186_gpio_probe,
+ .ops = &tegra186_gpio_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};
diff --git a/drivers/gpio/tegra186_gpio_priv.h b/drivers/gpio/tegra186_gpio_priv.h
new file mode 100644
index 000000000000..9e85a4343b2d
--- /dev/null
+++ b/drivers/gpio/tegra186_gpio_priv.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#ifndef _TEGRA186_GPIO_PRIV_H_
+#define _TEGRA186_GPIO_PRIV_H_
+
+/*
+ * For each GPIO, there are a set of registers than affect it, all packed
+ * back-to-back.
+ */
+#define TEGRA186_GPIO_ENABLE_CONFIG 0x00
+#define TEGRA186_GPIO_ENABLE_CONFIG_ENABLE BIT(0)
+#define TEGRA186_GPIO_ENABLE_CONFIG_OUT BIT(1)
+#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SHIFT 2
+#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_MASK 3
+#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_NONE 0
+#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_LEVEL 1
+#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE 2
+#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_DOUBLE_EDGE 3
+#define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL_HIGH_RISING BIT(4)
+#define TEGRA186_GPIO_ENABLE_CONFIG_DEBOUNCE_ENABLE BIT(5)
+#define TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT_ENABLE BIT(6)
+#define TEGRA186_GPIO_ENABLE_CONFIG_TIMESTAMPING_ENABLE BIT(7)
+
+#define TEGRA186_GPIO_DEBOUNCE_THRESHOLD 0x04
+
+#define TEGRA186_GPIO_INPUT 0x08
+
+#define TEGRA186_GPIO_OUTPUT_CONTROL 0x0c
+#define TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED BIT(0)
+
+#define TEGRA186_GPIO_OUTPUT_VALUE 0x10
+#define TEGRA186_GPIO_OUTPUT_VALUE_HIGH 1
+
+#define TEGRA186_GPIO_INTERRUPT_CLEAR 0x14
+
+/*
+ * 8 GPIOs are packed into a port. Their registers appear back-to-back in the
+ * port's address space.
+ */
+#define TEGRA186_GPIO_PER_GPIO_STRIDE 0x20
+#define TEGRA186_GPIO_PER_GPIO_COUNT 8
+
+/*
+ * Per-port registers are packed immediately following all of a port's
+ * per-GPIO registers.
+ */
+#define TEGRA186_GPIO_INTERRUPT_STATUS_G 0x100
+#define TEGRA186_GPIO_INTERRUPT_STATUS_G_STRIDE 4
+#define TEGRA186_GPIO_INTERRUPT_STATUS_G_COUNT 8
+
+/*
+ * The registers for multiple ports are packed together back-to-back to form
+ * the overall controller.
+ */
+#define TEGRA186_GPIO_PER_PORT_STRIDE 0x200
+
+#endif
diff --git a/include/dt-bindings/gpio/tegra186-gpio.h b/include/dt-bindings/gpio/tegra186-gpio.h
new file mode 100644
index 000000000000..7e6fb95da140
--- /dev/null
+++ b/include/dt-bindings/gpio/tegra186-gpio.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ * This header provides constants for binding nvidia,tegra186-gpio*.
+ *
+ * The first cell in Tegra's GPIO specifier is the GPIO ID. The macros below
+ * provide names for this.
+ *
+ * The second cell contains standard flag values specified in gpio.h.
+ */
+
+#ifndef _DT_BINDINGS_GPIO_TEGRA186_GPIO_H
+#define _DT_BINDINGS_GPIO_TEGRA186_GPIO_H
+
+#include <dt-bindings/gpio/gpio.h>
+
+/* GPIOs implemented by main GPIO controller */
+#define TEGRA_MAIN_GPIO_PORT_A 0
+#define TEGRA_MAIN_GPIO_PORT_B 1
+#define TEGRA_MAIN_GPIO_PORT_C 2
+#define TEGRA_MAIN_GPIO_PORT_D 3
+#define TEGRA_MAIN_GPIO_PORT_E 4
+#define TEGRA_MAIN_GPIO_PORT_F 5
+#define TEGRA_MAIN_GPIO_PORT_G 6
+#define TEGRA_MAIN_GPIO_PORT_H 7
+#define TEGRA_MAIN_GPIO_PORT_I 8
+#define TEGRA_MAIN_GPIO_PORT_J 9
+#define TEGRA_MAIN_GPIO_PORT_K 10
+#define TEGRA_MAIN_GPIO_PORT_L 11
+#define TEGRA_MAIN_GPIO_PORT_M 12
+#define TEGRA_MAIN_GPIO_PORT_N 13
+#define TEGRA_MAIN_GPIO_PORT_O 14
+#define TEGRA_MAIN_GPIO_PORT_P 15
+#define TEGRA_MAIN_GPIO_PORT_Q 16
+#define TEGRA_MAIN_GPIO_PORT_R 17
+#define TEGRA_MAIN_GPIO_PORT_T 18
+#define TEGRA_MAIN_GPIO_PORT_X 19
+#define TEGRA_MAIN_GPIO_PORT_Y 20
+#define TEGRA_MAIN_GPIO_PORT_BB 21
+#define TEGRA_MAIN_GPIO_PORT_CC 22
+
+#define TEGRA_MAIN_GPIO(port, offset) \
+ ((TEGRA_MAIN_GPIO_PORT_##port * 8) + offset)
+
+/* GPIOs implemented by AON GPIO controller */
+#define TEGRA_AON_GPIO_PORT_S 0
+#define TEGRA_AON_GPIO_PORT_U 1
+#define TEGRA_AON_GPIO_PORT_V 2
+#define TEGRA_AON_GPIO_PORT_W 3
+#define TEGRA_AON_GPIO_PORT_Z 4
+#define TEGRA_AON_GPIO_PORT_AA 5
+#define TEGRA_AON_GPIO_PORT_EE 6
+#define TEGRA_AON_GPIO_PORT_FF 7
+
+#define TEGRA_AON_GPIO(port, offset) \
+ ((TEGRA_AON_GPIO_PORT_##port * 8) + offset)
+
+#endif
--
2.8.3
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