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,exynos3250-pinctrl": for Exynos3250 compatible pin-controller.
17 - "samsung,exynos4210-pinctrl": for Exynos4210 compatible pin-controller.
18 - "samsung,exynos4x12-pinctrl": for Exynos4x12 compatible pin-controller.
19 - "samsung,exynos5250-pinctrl": for Exynos5250 compatible pin-controller.
20 - "samsung,exynos5260-pinctrl": for Exynos5260 compatible pin-controller.
21 - "samsung,exynos5410-pinctrl": for Exynos5410 compatible pin-controller.
22 - "samsung,exynos5420-pinctrl": for Exynos5420 compatible pin-controller.
23 - "samsung,exynos5433-pinctrl": for Exynos5433 compatible pin-controller.
24 - "samsung,exynos7-pinctrl": for Exynos7 compatible pin-controller.
26 - reg: Base address of the pin controller hardware module and length of
27 the address space it occupies.
29 - reg: Second base address of the pin controller if the specific registers
30 of the pin controller are separated into the different base address.
32 Eg: GPF[1-5] of Exynos5433 are separated into the two base address.
33 - First base address is for GPAx and GPF[1-5] external interrupt
35 - Second base address is for GPF[1-5] pinctrl registers.
37 pinctrl_0: pinctrl@10580000 {
38 compatible = "samsung,exynos5433-pinctrl";
39 reg = <0x10580000 0x1a20>, <0x11090000 0x100>;
41 wakeup-interrupt-controller {
42 compatible = "samsung,exynos7-wakeup-eint";
43 interrupts = <0 16 0>;
47 - Pin banks as child nodes: Pin banks of the controller are represented by child
48 nodes of the controller node. Bank name is taken from name of the node. Each
49 bank node must contain following properties:
51 - gpio-controller: identifies the node as a gpio controller and pin bank.
52 - #gpio-cells: number of cells in GPIO specifier. Since the generic GPIO
53 binding is used, the amount of cells must be specified as 2. See the below
54 mentioned gpio binding representation for description of particular cells.
57 <[phandle of the gpio controller node]
58 [pin number within the gpio controller]
61 Values for gpio specifier:
62 - Pin number: is a value between 0 to 7.
63 - Flags: 0 - Active High
66 - Pin mux/config groups as child nodes: The pin mux (selecting pin function
67 mode) and pin config (pull up/down, driver strength) settings are represented
68 as child nodes of the pin-controller node. There should be atleast one
69 child node and there is no limit on the count of these child nodes. It is
70 also possible for a child node to consist of several further child nodes
71 to allow grouping multiple pinctrl groups into one. The format of second
72 level child nodes is exactly the same as for first level ones and is
75 The child node should contain a list of pin(s) on which a particular pin
76 function selection or pin configuration (or both) have to applied. This
77 list of pins is specified using the property name "samsung,pins". There
78 should be atleast one pin specfied for this property and there is no upper
79 limit on the count of pins that can be specified. The pins are specified
80 using pin names which are derived from the hardware manual of the SoC. As
81 an example, the pins in GPA0 bank of the pin controller can be represented
82 as "gpa0-0", "gpa0-1", "gpa0-2" and so on. The names should be in lower case.
83 The format of the pin names should be (as per the hardware manual)
84 "[pin bank name]-[pin number within the bank]".
86 The pin function selection that should be applied on the pins listed in the
87 child node is specified using the "samsung,pin-function" property. The value
88 of this property that should be applied to each of the pins listed in the
89 "samsung,pins" property should be picked from the hardware manual of the SoC
90 for the specified pin group. This property is optional in the child node if
91 no specific function selection is desired for the pins listed in the child
92 node. The value of this property is used as-is to program the pin-controller
93 function selector register of the pin-bank.
95 The child node can also optionally specify one or more of the pin
96 configuration that should be applied on all the pins listed in the
97 "samsung,pins" property of the child node. The following pin configuration
98 properties are supported.
100 - samsung,pin-val: Initial value of pin output buffer.
101 - samsung,pin-pud: Pull up/down configuration.
102 - samsung,pin-drv: Drive strength configuration.
103 - samsung,pin-pud-pdn: Pull up/down configuration in power down mode.
104 - samsung,pin-drv-pdn: Drive strength configuration in power down mode.
106 The values specified by these config properties should be derived from the
107 hardware manual and these values are programmed as-is into the pin
108 pull up/down and driver strength register of the pin-controller.
110 Note: A child should include atleast a pin function selection property or
111 pin configuration property (one or more) or both.
113 The client nodes that require a particular pin function selection and/or
114 pin configuration should use the bindings listed in the "pinctrl-bindings.txt"
117 External GPIO and Wakeup Interrupts:
119 The controller supports two types of external interrupts over gpio. The first
120 is the external gpio interrupt and second is the external wakeup interrupts.
121 The difference between the two is that the external wakeup interrupts can be
122 used as system wakeup events.
124 A. External GPIO Interrupts: For supporting external gpio interrupts, the
125 following properties should be specified in the pin-controller device node.
127 - interrupt-parent: phandle of the interrupt parent to which the external
128 GPIO interrupts are forwarded to.
129 - interrupts: interrupt specifier for the controller. The format and value of
130 the interrupt specifier depends on the interrupt parent for the controller.
132 In addition, following properties must be present in node of every bank
133 of pins supporting GPIO interrupts:
135 - interrupt-controller: identifies the controller node as interrupt-parent.
136 - #interrupt-cells: the value of this property should be 2.
137 - First Cell: represents the external gpio interrupt number local to the
138 external gpio interrupt space of the controller.
139 - Second Cell: flags to identify the type of the interrupt
140 - 1 = rising edge triggered
141 - 2 = falling edge triggered
142 - 3 = rising and falling edge triggered
143 - 4 = high level triggered
144 - 8 = low level triggered
146 B. External Wakeup Interrupts: For supporting external wakeup interrupts, a
147 child node representing the external wakeup interrupt controller should be
148 included in the pin-controller device node. This child node should include
149 the following properties.
151 - compatible: identifies the type of the external wakeup interrupt controller
152 The possible values are:
153 - samsung,s3c2410-wakeup-eint: represents wakeup interrupt controller
154 found on Samsung S3C24xx SoCs except S3C2412 and S3C2413,
155 - samsung,s3c2412-wakeup-eint: represents wakeup interrupt controller
156 found on Samsung S3C2412 and S3C2413 SoCs,
157 - samsung,s3c64xx-wakeup-eint: represents wakeup interrupt controller
158 found on Samsung S3C64xx SoCs,
159 - samsung,exynos4210-wakeup-eint: represents wakeup interrupt controller
160 found on Samsung Exynos4210 and S5PC110/S5PV210 SoCs.
161 - samsung,exynos7-wakeup-eint: represents wakeup interrupt controller
162 found on Samsung Exynos7 SoC.
163 - interrupt-parent: phandle of the interrupt parent to which the external
164 wakeup interrupts are forwarded to.
165 - interrupts: interrupt used by multiplexed wakeup interrupts.
167 In addition, following properties must be present in node of every bank
168 of pins supporting wake-up interrupts:
170 - interrupt-controller: identifies the node as interrupt-parent.
171 - #interrupt-cells: the value of this property should be 2
172 - First Cell: represents the external wakeup interrupt number local to
173 the external wakeup interrupt space of the controller.
174 - Second Cell: flags to identify the type of the interrupt
175 - 1 = rising edge triggered
176 - 2 = falling edge triggered
177 - 3 = rising and falling edge triggered
178 - 4 = high level triggered
179 - 8 = low level triggered
181 Node of every bank of pins supporting direct wake-up interrupts (without
182 multiplexing) must contain following properties:
184 - interrupt-parent: phandle of the interrupt parent to which the external
185 wakeup interrupts are forwarded to.
186 - interrupts: interrupts of the interrupt parent which are used for external
187 wakeup interrupts from pins of the bank, must contain interrupts for all
192 All the pin controller nodes should be represented in the aliases node using
193 the following format 'pinctrl{n}' where n is a unique number for the alias.
195 Aliases for controllers compatible with "samsung,exynos7-pinctrl":
196 - pinctrl0: pin controller of ALIVE block,
197 - pinctrl1: pin controller of BUS0 block,
198 - pinctrl2: pin controller of NFC block,
199 - pinctrl3: pin controller of TOUCH block,
200 - pinctrl4: pin controller of FF block,
201 - pinctrl5: pin controller of ESE block,
202 - pinctrl6: pin controller of FSYS0 block,
203 - pinctrl7: pin controller of FSYS1 block,
204 - pinctrl8: pin controller of BUS1 block,
205 - pinctrl9: pin controller of AUDIO block,
207 Example: A pin-controller node with pin banks:
209 pinctrl_0: pinctrl@11400000 {
210 compatible = "samsung,exynos4210-pinctrl";
211 reg = <0x11400000 0x1000>;
212 interrupts = <0 47 0>;
216 /* Pin bank without external interrupts */
224 /* Pin bank with external GPIO or muxed wake-up interrupts */
229 interrupt-controller;
230 #interrupt-cells = <2>;
235 /* Pin bank with external direct wake-up interrupts */
240 interrupt-controller;
241 interrupt-parent = <&gic>;
242 interrupts = <0 16 0>, <0 17 0>, <0 18 0>, <0 19 0>,
243 <0 20 0>, <0 21 0>, <0 22 0>, <0 23 0>;
244 #interrupt-cells = <2>;
250 Example 1: A pin-controller node with pin groups.
252 #include <dt-bindings/pinctrl/samsung.h>
254 pinctrl_0: pinctrl@11400000 {
255 compatible = "samsung,exynos4210-pinctrl";
256 reg = <0x11400000 0x1000>;
257 interrupts = <0 47 0>;
261 uart0_data: uart0-data {
262 samsung,pins = "gpa0-0", "gpa0-1";
263 samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
264 samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
265 samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
268 uart0_fctl: uart0-fctl {
269 samsung,pins = "gpa0-2", "gpa0-3";
270 samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
271 samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
272 samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
275 uart1_data: uart1-data {
276 samsung,pins = "gpa0-4", "gpa0-5";
277 samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
278 samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
279 samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
282 uart1_fctl: uart1-fctl {
283 samsung,pins = "gpa0-6", "gpa0-7";
284 samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
285 samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
286 samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
290 samsung,pins = "gpa0-6", "gpa0-7";
291 samsung,pin-function = <EXYNOS_PIN_FUNC_3>;
292 samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
293 samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
296 sd4_bus8: sd4-bus-width8 {
298 samsung,pins = "gpk0-3", "gpk0-4",
300 samsung,pin-function = <EXYNOS_PIN_FUNC_3>;
301 samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
302 samsung,pin-drv = <EXYNOS4_PIN_DRV_LV4>;
305 samsung,pins = "gpk1-3", "gpk1-4",
307 samsung,pin-function = <EXYNOS_PIN_FUNC_4>;
308 samsung,pin-pud = <EXYNOS_PIN_PULL_UP>;
309 samsung,pin-drv = <EXYNOS4_PIN_DRV_LV4>;
314 Example 2: A pin-controller node with external wakeup interrupt controller node.
316 pinctrl_1: pinctrl@11000000 {
317 compatible = "samsung,exynos4210-pinctrl";
318 reg = <0x11000000 0x1000>;
319 interrupts = <0 46 0>
323 wakeup-interrupt-controller {
324 compatible = "samsung,exynos4210-wakeup-eint";
325 interrupt-parent = <&gic>;
326 interrupts = <0 32 0>;
330 Example 3: A uart client node that supports 'default' and 'flow-control' states.
333 compatible = "samsung,exynos4210-uart";
334 reg = <0x13800000 0x100>;
335 interrupts = <0 52 0>;
336 pinctrl-names = "default", "flow-control;
337 pinctrl-0 = <&uart0_data>;
338 pinctrl-1 = <&uart0_data &uart0_fctl>;
341 Example 4: Set up the default pin state for uart controller.
343 static int s3c24xx_serial_probe(struct platform_device *pdev) {
344 struct pinctrl *pinctrl;
348 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
351 Example 5: A display port client node that supports 'default' pinctrl state
354 display-port-controller {
357 samsung,hpd-gpio = <&gpx2 6 0>;
358 pinctrl-names = "default";
359 pinctrl-0 = <&dp_hpd>;
362 Example 6: Request the gpio for display port controller
364 static int exynos_dp_probe(struct platform_device *pdev)
367 struct device *dev = &pdev->dev;
368 struct device_node *dp_node = dev->of_node;
372 hpd_gpio = of_get_named_gpio(dp_node, "samsung,hpd-gpio", 0);
376 ret = devm_gpio_request_one(&pdev->dev, hpd_gpio, GPIOF_IN,