1 Samsung GPIO and Pin Mux/Config controller
3 Samsung's ARM based SoC's integrates a GPIO and Pin mux/config hardware
4 controller. It controls the input/output settings on the available pads/pins
5 and also provides ability to multiplex and configure the output of various
6 on-chip controllers onto these pads.
9 - compatible: should be one of the following.
10 - "samsung,s3c2412-pinctrl": for S3C2412-compatible pin-controller,
11 - "samsung,s3c2416-pinctrl": for S3C2416-compatible pin-controller,
12 - "samsung,s3c2440-pinctrl": for S3C2440-compatible pin-controller,
13 - "samsung,s3c2450-pinctrl": for S3C2450-compatible pin-controller,
14 - "samsung,s3c64xx-pinctrl": for S3C64xx-compatible pin-controller,
15 - "samsung,s5pv210-pinctrl": for S5PV210-compatible pin-controller,
16 - "samsung,exynos4210-pinctrl": for Exynos4210 compatible pin-controller.
17 - "samsung,exynos4x12-pinctrl": for Exynos4x12 compatible pin-controller.
18 - "samsung,exynos5250-pinctrl": for Exynos5250 compatible pin-controller.
19 - "samsung,exynos5260-pinctrl": for Exynos5260 compatible pin-controller.
20 - "samsung,exynos5410-pinctrl": for Exynos5410 compatible pin-controller.
21 - "samsung,exynos5420-pinctrl": for Exynos5420 compatible pin-controller.
22 - "samsung,exynos5433-pinctrl": for Exynos5433 compatible pin-controller.
23 - "samsung,exynos7-pinctrl": for Exynos7 compatible pin-controller.
25 - reg: Base address of the pin controller hardware module and length of
26 the address space it occupies.
28 - reg: Second base address of the pin controller if the specific registers
29 of the pin controller are separated into the different base address.
31 Eg: GPF[1-5] of Exynos5433 are separated into the two base address.
32 - First base address is for GPAx and GPF[1-5] external interrupt
34 - Second base address is for GPF[1-5] pinctrl registers.
36 pinctrl_0: pinctrl@10580000 {
37 compatible = "samsung,exynos5433-pinctrl";
38 reg = <0x10580000 0x1a20>, <0x11090000 0x100>;
40 wakeup-interrupt-controller {
41 compatible = "samsung,exynos7-wakeup-eint";
42 interrupts = <0 16 0>;
46 - Pin banks as child nodes: Pin banks of the controller are represented by child
47 nodes of the controller node. Bank name is taken from name of the node. Each
48 bank node must contain following properties:
50 - gpio-controller: identifies the node as a gpio controller and pin bank.
51 - #gpio-cells: number of cells in GPIO specifier. Since the generic GPIO
52 binding is used, the amount of cells must be specified as 2. See the below
53 mentioned gpio binding representation for description of particular cells.
56 <[phandle of the gpio controller node]
57 [pin number within the gpio controller]
60 Values for gpio specifier:
61 - Pin number: is a value between 0 to 7.
62 - Flags: 0 - Active High
65 - Pin mux/config groups as child nodes: The pin mux (selecting pin function
66 mode) and pin config (pull up/down, driver strength) settings are represented
67 as child nodes of the pin-controller node. There should be atleast one
68 child node and there is no limit on the count of these child nodes. It is
69 also possible for a child node to consist of several further child nodes
70 to allow grouping multiple pinctrl groups into one. The format of second
71 level child nodes is exactly the same as for first level ones and is
74 The child node should contain a list of pin(s) on which a particular pin
75 function selection or pin configuration (or both) have to applied. This
76 list of pins is specified using the property name "samsung,pins". There
77 should be atleast one pin specfied for this property and there is no upper
78 limit on the count of pins that can be specified. The pins are specified
79 using pin names which are derived from the hardware manual of the SoC. As
80 an example, the pins in GPA0 bank of the pin controller can be represented
81 as "gpa0-0", "gpa0-1", "gpa0-2" and so on. The names should be in lower case.
82 The format of the pin names should be (as per the hardware manual)
83 "[pin bank name]-[pin number within the bank]".
85 The pin function selection that should be applied on the pins listed in the
86 child node is specified using the "samsung,pin-function" property. The value
87 of this property that should be applied to each of the pins listed in the
88 "samsung,pins" property should be picked from the hardware manual of the SoC
89 for the specified pin group. This property is optional in the child node if
90 no specific function selection is desired for the pins listed in the child
91 node. The value of this property is used as-is to program the pin-controller
92 function selector register of the pin-bank.
94 The child node can also optionally specify one or more of the pin
95 configuration that should be applied on all the pins listed in the
96 "samsung,pins" property of the child node. The following pin configuration
97 properties are supported.
99 - samsung,pin-val: Initial value of pin output buffer.
100 - samsung,pin-pud: Pull up/down configuration.
101 - samsung,pin-drv: Drive strength configuration.
102 - samsung,pin-pud-pdn: Pull up/down configuration in power down mode.
103 - samsung,pin-drv-pdn: Drive strength configuration in power down mode.
105 The values specified by these config properties should be derived from the
106 hardware manual and these values are programmed as-is into the pin
107 pull up/down and driver strength register of the pin-controller.
109 Note: A child should include atleast a pin function selection property or
110 pin configuration property (one or more) or both.
112 The client nodes that require a particular pin function selection and/or
113 pin configuration should use the bindings listed in the "pinctrl-bindings.txt"
116 External GPIO and Wakeup Interrupts:
118 The controller supports two types of external interrupts over gpio. The first
119 is the external gpio interrupt and second is the external wakeup interrupts.
120 The difference between the two is that the external wakeup interrupts can be
121 used as system wakeup events.
123 A. External GPIO Interrupts: For supporting external gpio interrupts, the
124 following properties should be specified in the pin-controller device node.
126 - interrupt-parent: phandle of the interrupt parent to which the external
127 GPIO interrupts are forwarded to.
128 - interrupts: interrupt specifier for the controller. The format and value of
129 the interrupt specifier depends on the interrupt parent for the controller.
131 In addition, following properties must be present in node of every bank
132 of pins supporting GPIO interrupts:
134 - interrupt-controller: identifies the controller node as interrupt-parent.
135 - #interrupt-cells: the value of this property should be 2.
136 - First Cell: represents the external gpio interrupt number local to the
137 external gpio interrupt space of the controller.
138 - Second Cell: flags to identify the type of the interrupt
139 - 1 = rising edge triggered
140 - 2 = falling edge triggered
141 - 3 = rising and falling edge triggered
142 - 4 = high level triggered
143 - 8 = low level triggered
145 B. External Wakeup Interrupts: For supporting external wakeup interrupts, a
146 child node representing the external wakeup interrupt controller should be
147 included in the pin-controller device node. This child node should include
148 the following properties.
150 - compatible: identifies the type of the external wakeup interrupt controller
151 The possible values are:
152 - samsung,s3c2410-wakeup-eint: represents wakeup interrupt controller
153 found on Samsung S3C24xx SoCs except S3C2412 and S3C2413,
154 - samsung,s3c2412-wakeup-eint: represents wakeup interrupt controller
155 found on Samsung S3C2412 and S3C2413 SoCs,
156 - samsung,s3c64xx-wakeup-eint: represents wakeup interrupt controller
157 found on Samsung S3C64xx SoCs,
158 - samsung,exynos4210-wakeup-eint: represents wakeup interrupt controller
159 found on Samsung Exynos4210 and S5PC110/S5PV210 SoCs.
160 - samsung,exynos7-wakeup-eint: represents wakeup interrupt controller
161 found on Samsung Exynos7 SoC.
162 - interrupt-parent: phandle of the interrupt parent to which the external
163 wakeup interrupts are forwarded to.
164 - interrupts: interrupt used by multiplexed wakeup interrupts.
166 In addition, following properties must be present in node of every bank
167 of pins supporting wake-up interrupts:
169 - interrupt-controller: identifies the node as interrupt-parent.
170 - #interrupt-cells: the value of this property should be 2
171 - First Cell: represents the external wakeup interrupt number local to
172 the external wakeup interrupt space of the controller.
173 - Second Cell: flags to identify the type of the interrupt
174 - 1 = rising edge triggered
175 - 2 = falling edge triggered
176 - 3 = rising and falling edge triggered
177 - 4 = high level triggered
178 - 8 = low level triggered
180 Node of every bank of pins supporting direct wake-up interrupts (without
181 multiplexing) must contain following properties:
183 - interrupt-parent: phandle of the interrupt parent to which the external
184 wakeup interrupts are forwarded to.
185 - interrupts: interrupts of the interrupt parent which are used for external
186 wakeup interrupts from pins of the bank, must contain interrupts for all
191 All the pin controller nodes should be represented in the aliases node using
192 the following format 'pinctrl{n}' where n is a unique number for the alias.
194 Aliases for controllers compatible with "samsung,exynos7-pinctrl":
195 - pinctrl0: pin controller of ALIVE block,
196 - pinctrl1: pin controller of BUS0 block,
197 - pinctrl2: pin controller of NFC block,
198 - pinctrl3: pin controller of TOUCH block,
199 - pinctrl4: pin controller of FF block,
200 - pinctrl5: pin controller of ESE block,
201 - pinctrl6: pin controller of FSYS0 block,
202 - pinctrl7: pin controller of FSYS1 block,
203 - pinctrl8: pin controller of BUS1 block,
204 - pinctrl9: pin controller of AUDIO block,
206 Example: A pin-controller node with pin banks:
208 pinctrl_0: pinctrl@11400000 {
209 compatible = "samsung,exynos4210-pinctrl";
210 reg = <0x11400000 0x1000>;
211 interrupts = <0 47 0>;
215 /* Pin bank without external interrupts */
223 /* Pin bank with external GPIO or muxed wake-up interrupts */
228 interrupt-controller;
229 #interrupt-cells = <2>;
234 /* Pin bank with external direct wake-up interrupts */
239 interrupt-controller;
240 interrupt-parent = <&gic>;
241 interrupts = <0 16 0>, <0 17 0>, <0 18 0>, <0 19 0>,
242 <0 20 0>, <0 21 0>, <0 22 0>, <0 23 0>;
243 #interrupt-cells = <2>;
249 Example 1: A pin-controller node with pin groups.
251 #include <dt-bindings/pinctrl/samsung.h>
253 pinctrl_0: pinctrl@11400000 {
254 compatible = "samsung,exynos4210-pinctrl";
255 reg = <0x11400000 0x1000>;
256 interrupts = <0 47 0>;
260 uart0_data: uart0-data {
261 samsung,pins = "gpa0-0", "gpa0-1";
262 samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
263 samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
264 samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
267 uart0_fctl: uart0-fctl {
268 samsung,pins = "gpa0-2", "gpa0-3";
269 samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
270 samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
271 samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
274 uart1_data: uart1-data {
275 samsung,pins = "gpa0-4", "gpa0-5";
276 samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
277 samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
278 samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
281 uart1_fctl: uart1-fctl {
282 samsung,pins = "gpa0-6", "gpa0-7";
283 samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
284 samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
285 samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
289 samsung,pins = "gpa0-6", "gpa0-7";
290 samsung,pin-function = <EXYNOS_PIN_FUNC_3>;
291 samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
292 samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
295 sd4_bus8: sd4-bus-width8 {
297 samsung,pins = "gpk0-3", "gpk0-4",
299 samsung,pin-function = <EXYNOS_PIN_FUNC_3>;
300 samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
301 samsung,pin-drv = <EXYNOS4_PIN_DRV_LV4>;
304 samsung,pins = "gpk1-3", "gpk1-4",
306 samsung,pin-function = <EXYNOS_PIN_FUNC_4>;
307 samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
308 samsung,pin-drv = <EXYNOS4_PIN_DRV_LV4>;
313 Example 2: A pin-controller node with external wakeup interrupt controller node.
315 pinctrl_1: pinctrl@11000000 {
316 compatible = "samsung,exynos4210-pinctrl";
317 reg = <0x11000000 0x1000>;
318 interrupts = <0 46 0>
322 wakeup-interrupt-controller {
323 compatible = "samsung,exynos4210-wakeup-eint";
324 interrupt-parent = <&gic>;
325 interrupts = <0 32 0>;
329 Example 3: A uart client node that supports 'default' and 'flow-control' states.
332 compatible = "samsung,exynos4210-uart";
333 reg = <0x13800000 0x100>;
334 interrupts = <0 52 0>;
335 pinctrl-names = "default", "flow-control;
336 pinctrl-0 = <&uart0_data>;
337 pinctrl-1 = <&uart0_data &uart0_fctl>;
340 Example 4: Set up the default pin state for uart controller.
342 static int s3c24xx_serial_probe(struct platform_device *pdev) {
343 struct pinctrl *pinctrl;
347 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
350 Example 5: A display port client node that supports 'default' pinctrl state
353 display-port-controller {
356 samsung,hpd-gpio = <&gpx2 6 0>;
357 pinctrl-names = "default";
358 pinctrl-0 = <&dp_hpd>;
361 Example 6: Request the gpio for display port controller
363 static int exynos_dp_probe(struct platform_device *pdev)
366 struct device *dev = &pdev->dev;
367 struct device_node *dp_node = dev->of_node;
371 hpd_gpio = of_get_named_gpio(dp_node, "samsung,hpd-gpio", 0);
375 ret = devm_gpio_request_one(&pdev->dev, hpd_gpio, GPIOF_IN,