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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 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.
+#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 =
+ 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 =
+ gpio-controller;
+ #gpio-cells = <2>;
+ interrupt-controller;
+ #interrupt-cells = <2>;