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+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 contguous 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
+ aliass.
+ - "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.
+ 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.
+ 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@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@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>;
+};
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+/*
+ * 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_TEGRA_GPIO_H
+#define _DT_BINDINGS_GPIO_TEGRA_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