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-Samsung GPIO and Pin Mux/Config controller
-
-Samsung's ARM based SoC's integrates a GPIO and Pin mux/config hardware
-controller. It controls the input/output settings on the available pads/pins
-and also provides ability to multiplex and configure the output of various
-on-chip controllers onto these pads.
-
-Required Properties:
-- compatible: should be one of the following.
- - "samsung,s3c2412-pinctrl": for S3C2412-compatible pin-controller,
- - "samsung,s3c2416-pinctrl": for S3C2416-compatible pin-controller,
- - "samsung,s3c2440-pinctrl": for S3C2440-compatible pin-controller,
- - "samsung,s3c2450-pinctrl": for S3C2450-compatible pin-controller,
- - "samsung,s3c64xx-pinctrl": for S3C64xx-compatible pin-controller,
- - "samsung,s5pv210-pinctrl": for S5PV210-compatible pin-controller,
- - "samsung,exynos3250-pinctrl": for Exynos3250 compatible pin-controller.
- - "samsung,exynos4210-pinctrl": for Exynos4210 compatible pin-controller.
- - "samsung,exynos4x12-pinctrl": for Exynos4x12 compatible pin-controller.
- - "samsung,exynos5250-pinctrl": for Exynos5250 compatible pin-controller.
- - "samsung,exynos5260-pinctrl": for Exynos5260 compatible pin-controller.
- - "samsung,exynos5410-pinctrl": for Exynos5410 compatible pin-controller.
- - "samsung,exynos5420-pinctrl": for Exynos5420 compatible pin-controller.
- - "samsung,exynos5433-pinctrl": for Exynos5433 compatible pin-controller.
- - "samsung,exynos7-pinctrl": for Exynos7 compatible pin-controller.
- - "samsung,exynos850-pinctrl": for Exynos850 compatible pin-controller.
-
-- reg: Base address of the pin controller hardware module and length of
- the address space it occupies.
-
- - reg: Second base address of the pin controller if the specific registers
- of the pin controller are separated into the different base address.
-
- Eg: GPF[1-5] of Exynos5433 are separated into the two base address.
- - First base address is for GPAx and GPF[1-5] external interrupt
- registers.
- - Second base address is for GPF[1-5] pinctrl registers.
-
- pinctrl_0: pinctrl@10580000 {
- compatible = "samsung,exynos5433-pinctrl";
- reg = <0x10580000 0x1a20>, <0x11090000 0x100>;
-
- wakeup-interrupt-controller {
- compatible = "samsung,exynos7-wakeup-eint";
- interrupts = <0 16 0>;
- };
- };
-
-- Pin banks as child nodes: Pin banks of the controller are represented by child
- nodes of the controller node. Bank name is taken from name of the node. Each
- bank node must contain following properties:
-
- - gpio-controller: identifies the node as a gpio controller and pin bank.
- - #gpio-cells: number of cells in GPIO specifier. Since the generic GPIO
- binding is used, the amount of cells must be specified as 2. See the below
- mentioned gpio binding representation for description of particular cells.
-
- Eg: <&gpx2 6 0>
- <[phandle of the gpio controller node]
- [pin number within the gpio controller]
- [flags]>
-
- Values for gpio specifier:
- - Pin number: is a value between 0 to 7.
- - Flags: 0 - Active High
- 1 - Active Low
-
-- Pin mux/config groups as child nodes: The pin mux (selecting pin function
- mode) and pin config (pull up/down, driver strength) settings are represented
- as child nodes of the pin-controller node. There should be at least one
- child node and there is no limit on the count of these child nodes. It is
- also possible for a child node to consist of several further child nodes
- to allow grouping multiple pinctrl groups into one. The format of second
- level child nodes is exactly the same as for first level ones and is
- described below.
-
- The child node should contain a list of pin(s) on which a particular pin
- function selection or pin configuration (or both) have to applied. This
- list of pins is specified using the property name "samsung,pins". There
- should be at least one pin specified for this property and there is no upper
- limit on the count of pins that can be specified. The pins are specified
- using pin names which are derived from the hardware manual of the SoC. As
- an example, the pins in GPA0 bank of the pin controller can be represented
- as "gpa0-0", "gpa0-1", "gpa0-2" and so on. The names should be in lower case.
- The format of the pin names should be (as per the hardware manual)
- "[pin bank name]-[pin number within the bank]".
-
- The pin function selection that should be applied on the pins listed in the
- child node is specified using the "samsung,pin-function" property. The value
- of this property that should be applied to each of the pins listed in the
- "samsung,pins" property should be picked from the hardware manual of the SoC
- for the specified pin group. This property is optional in the child node if
- no specific function selection is desired for the pins listed in the child
- node. The value of this property is used as-is to program the pin-controller
- function selector register of the pin-bank.
-
- The child node can also optionally specify one or more of the pin
- configuration that should be applied on all the pins listed in the
- "samsung,pins" property of the child node. The following pin configuration
- properties are supported.
-
- - samsung,pin-val: Initial value of pin output buffer.
- - samsung,pin-pud: Pull up/down configuration.
- - samsung,pin-drv: Drive strength configuration.
- - samsung,pin-pud-pdn: Pull up/down configuration in power down mode.
- - samsung,pin-drv-pdn: Drive strength configuration in power down mode.
-
- The values specified by these config properties should be derived from the
- hardware manual and these values are programmed as-is into the pin
- pull up/down and driver strength register of the pin-controller.
-
- Note: A child should include at least a pin function selection property or
- pin configuration property (one or more) or both.
-
- The client nodes that require a particular pin function selection and/or
- pin configuration should use the bindings listed in the "pinctrl-bindings.txt"
- file.
-
-External GPIO and Wakeup Interrupts:
-
-The controller supports two types of external interrupts over gpio. The first
-is the external gpio interrupt and second is the external wakeup interrupts.
-The difference between the two is that the external wakeup interrupts can be
-used as system wakeup events.
-
-A. External GPIO Interrupts: For supporting external gpio interrupts, the
- following properties should be specified in the pin-controller device node.
-
- - interrupts: interrupt specifier for the controller. The format and value of
- the interrupt specifier depends on the interrupt parent for the controller.
-
- In addition, following properties must be present in node of every bank
- of pins supporting GPIO interrupts:
-
- - interrupt-controller: identifies the controller node as interrupt-parent.
- - #interrupt-cells: the value of this property should be 2.
- - First Cell: represents the external gpio interrupt number local to the
- external gpio interrupt space of the controller.
- - Second Cell: flags to identify the type of the interrupt
- - 1 = rising edge triggered
- - 2 = falling edge triggered
- - 3 = rising and falling edge triggered
- - 4 = high level triggered
- - 8 = low level triggered
-
-B. External Wakeup Interrupts: For supporting external wakeup interrupts, a
- child node representing the external wakeup interrupt controller should be
- included in the pin-controller device node.
-
- Only one pin-controller device node can include external wakeup interrupts
- child node (in other words, only one External Wakeup Interrupts
- pin-controller is supported).
-
- This child node should include following properties:
-
- - compatible: identifies the type of the external wakeup interrupt controller
- The possible values are:
- - samsung,s3c2410-wakeup-eint: represents wakeup interrupt controller
- found on Samsung S3C24xx SoCs except S3C2412 and S3C2413,
- - samsung,s3c2412-wakeup-eint: represents wakeup interrupt controller
- found on Samsung S3C2412 and S3C2413 SoCs,
- - samsung,s3c64xx-wakeup-eint: represents wakeup interrupt controller
- found on Samsung S3C64xx SoCs,
- - samsung,s5pv210-wakeup-eint: represents wakeup interrupt controller
- found on Samsung S5Pv210 SoCs,
- - samsung,exynos4210-wakeup-eint: represents wakeup interrupt controller
- found on Samsung Exynos4210 and S5PC110/S5PV210 SoCs.
- - samsung,exynos7-wakeup-eint: represents wakeup interrupt controller
- found on Samsung Exynos7 SoC.
- - interrupts: interrupt used by multiplexed wakeup interrupts.
-
- In addition, following properties must be present in node of every bank
- of pins supporting wake-up interrupts:
-
- - interrupt-controller: identifies the node as interrupt-parent.
- - #interrupt-cells: the value of this property should be 2
- - First Cell: represents the external wakeup interrupt number local to
- the external wakeup interrupt space of the controller.
- - Second Cell: flags to identify the type of the interrupt
- - 1 = rising edge triggered
- - 2 = falling edge triggered
- - 3 = rising and falling edge triggered
- - 4 = high level triggered
- - 8 = low level triggered
-
- Node of every bank of pins supporting direct wake-up interrupts (without
- multiplexing) must contain following properties:
-
- - interrupts: interrupts of the interrupt parent which are used for external
- wakeup interrupts from pins of the bank, must contain interrupts for all
- pins of the bank.
-
-Aliases:
-
-All the pin controller nodes should be represented in the aliases node using
-the following format 'pinctrl{n}' where n is a unique number for the alias.
-
-Aliases for controllers compatible with "samsung,exynos7-pinctrl":
-- pinctrl0: pin controller of ALIVE block,
-- pinctrl1: pin controller of BUS0 block,
-- pinctrl2: pin controller of NFC block,
-- pinctrl3: pin controller of TOUCH block,
-- pinctrl4: pin controller of FF block,
-- pinctrl5: pin controller of ESE block,
-- pinctrl6: pin controller of FSYS0 block,
-- pinctrl7: pin controller of FSYS1 block,
-- pinctrl8: pin controller of BUS1 block,
-- pinctrl9: pin controller of AUDIO block,
-
-Example: A pin-controller node with pin banks:
-
- pinctrl_0: pinctrl@11400000 {
- compatible = "samsung,exynos4210-pinctrl";
- reg = <0x11400000 0x1000>;
- interrupts = <0 47 0>;
-
- /* ... */
-
- /* Pin bank without external interrupts */
- gpy0: gpy0 {
- gpio-controller;
- #gpio-cells = <2>;
- };
-
- /* ... */
-
- /* Pin bank with external GPIO or muxed wake-up interrupts */
- gpj0: gpj0 {
- gpio-controller;
- #gpio-cells = <2>;
-
- interrupt-controller;
- #interrupt-cells = <2>;
- };
-
- /* ... */
-
- /* Pin bank with external direct wake-up interrupts */
- gpx0: gpx0 {
- gpio-controller;
- #gpio-cells = <2>;
-
- interrupt-controller;
- interrupt-parent = <&gic>;
- interrupts = <0 16 0>, <0 17 0>, <0 18 0>, <0 19 0>,
- <0 20 0>, <0 21 0>, <0 22 0>, <0 23 0>;
- #interrupt-cells = <2>;
- };
-
- /* ... */
- };
-
-Example 1: A pin-controller node with pin groups.
-
- #include <dt-bindings/pinctrl/samsung.h>
-
- pinctrl_0: pinctrl@11400000 {
- compatible = "samsung,exynos4210-pinctrl";
- reg = <0x11400000 0x1000>;
- interrupts = <0 47 0>;
-
- /* ... */
-
- uart0_data: uart0-data {
- samsung,pins = "gpa0-0", "gpa0-1";
- samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
- samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
- samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
- };
-
- uart0_fctl: uart0-fctl {
- samsung,pins = "gpa0-2", "gpa0-3";
- samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
- samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
- samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
- };
-
- uart1_data: uart1-data {
- samsung,pins = "gpa0-4", "gpa0-5";
- samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
- samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
- samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
- };
-
- uart1_fctl: uart1-fctl {
- samsung,pins = "gpa0-6", "gpa0-7";
- samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
- samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
- samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
- };
-
- i2c2_bus: i2c2-bus {
- samsung,pins = "gpa0-6", "gpa0-7";
- samsung,pin-function = <EXYNOS_PIN_FUNC_3>;
- samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
- samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
- };
-
- sd4_bus8: sd4-bus-width8 {
- part-1 {
- samsung,pins = "gpk0-3", "gpk0-4",
- "gpk0-5", "gpk0-6";
- samsung,pin-function = <EXYNOS_PIN_FUNC_3>;
- samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
- samsung,pin-drv = <EXYNOS4_PIN_DRV_LV4>;
- };
- part-2 {
- samsung,pins = "gpk1-3", "gpk1-4",
- "gpk1-5", "gpk1-6";
- samsung,pin-function = <EXYNOS_PIN_FUNC_4>;
- samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
- samsung,pin-drv = <EXYNOS4_PIN_DRV_LV4>;
- };
- };
- };
-
-Example 2: A pin-controller node with external wakeup interrupt controller node.
-
- pinctrl_1: pinctrl@11000000 {
- compatible = "samsung,exynos4210-pinctrl";
- reg = <0x11000000 0x1000>;
- interrupts = <0 46 0>
-
- /* ... */
-
- wakeup-interrupt-controller {
- compatible = "samsung,exynos4210-wakeup-eint";
- interrupt-parent = <&gic>;
- interrupts = <0 32 0>;
- };
- };
-
-Example 3: A uart client node that supports 'default' and 'flow-control' states.
-
- uart@13800000 {
- compatible = "samsung,exynos4210-uart";
- reg = <0x13800000 0x100>;
- interrupts = <0 52 0>;
- pinctrl-names = "default", "flow-control;
- pinctrl-0 = <&uart0_data>;
- pinctrl-1 = <&uart0_data>, <&uart0_fctl>;
- };
-
-Example 4: Set up the default pin state for uart controller.
-
- static int s3c24xx_serial_probe(struct platform_device *pdev) {
- struct pinctrl *pinctrl;
-
- /* ... */
-
- pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
- }
-
-Example 5: A display port client node that supports 'default' pinctrl state
- and gpio binding.
-
- display-port-controller {
- /* ... */
-
- samsung,hpd-gpio = <&gpx2 6 0>;
- pinctrl-names = "default";
- pinctrl-0 = <&dp_hpd>;
- };
-
-Example 6: Request the gpio for display port controller
-
- static int exynos_dp_probe(struct platform_device *pdev)
- {
- int hpd_gpio, ret;
- struct device *dev = &pdev->dev;
- struct device_node *dp_node = dev->of_node;
-
- /* ... */
-
- hpd_gpio = of_get_named_gpio(dp_node, "samsung,hpd-gpio", 0);
-
- /* ... */
-
- ret = devm_gpio_request_one(&pdev->dev, hpd_gpio, GPIOF_IN,
- "hpd_gpio");
- /* ... */
- }