CONFIG_OF_LIBFDT_OVERLAY=y
# CONFIG_EFI_LOADER is not set
CONFIG_CLK=y
+CONFIG_PINCTRL=y
+# CONFIG_PINCTRL_FULL is not set
+CONFIG_PINCTRL_STM32=y
--- /dev/null
+* STM32 GPIO and Pin Mux/Config controller
+
+STMicroelectronics's STM32 MCUs intregrate a GPIO and Pin mux/config hardware
+controller. It controls the input/output settings on the available pins and
+also provides ability to multiplex and configure the output of various on-chip
+controllers onto these pads.
+
+Pin controller node:
+Required properies:
+ - compatible: value should be one of the following:
+ (a) "st,stm32f429-pinctrl"
+ (b) "st,stm32f746-pinctrl"
+ - #address-cells: The value of this property must be 1
+ - #size-cells : The value of this property must be 1
+ - ranges : defines mapping between pin controller node (parent) to
+ gpio-bank node (children).
+ - pins-are-numbered: Specify the subnodes are using numbered pinmux to
+ specify pins.
+
+GPIO controller/bank node:
+Required properties:
+ - gpio-controller : Indicates this device is a GPIO controller
+ - #gpio-cells : Should be two.
+ The first cell is the pin number
+ The second one is the polarity:
+ - 0 for active high
+ - 1 for active low
+ - reg : The gpio address range, relative to the pinctrl range
+ - clocks : clock that drives this bank
+ - st,bank-name : Should be a name string for this bank as specified in
+ the datasheet
+
+Optional properties:
+ - reset: : Reference to the reset controller
+ - interrupt-parent: phandle of the interrupt parent to which the external
+ GPIO interrupts are forwarded to.
+ - st,syscfg: Should be phandle/offset pair. The phandle to the syscon node
+ which includes IRQ mux selection register, and the offset of the IRQ mux
+ selection register.
+
+Example:
+#include <dt-bindings/pinctrl/stm32f429-pinfunc.h>
+...
+
+ pin-controller {
+ #address-cells = <1>;
+ #size-cells = <1>;
+ compatible = "st,stm32f429-pinctrl";
+ ranges = <0 0x40020000 0x3000>;
+ pins-are-numbered;
+
+ gpioa: gpio@40020000 {
+ gpio-controller;
+ #gpio-cells = <2>;
+ reg = <0x0 0x400>;
+ resets = <&reset_ahb1 0>;
+ st,bank-name = "GPIOA";
+ };
+ ...
+ pin-functions nodes follow...
+ };
+
+Contents of function subnode node:
+----------------------------------
+Subnode format
+A pinctrl node should contain at least one subnode representing the
+pinctrl group available on the machine. Each subnode will list the
+pins it needs, and how they should be configured, with regard to muxer
+configuration, pullups, drive, output high/low and output speed.
+
+ node {
+ pinmux = <PIN_NUMBER_PINMUX>;
+ GENERIC_PINCONFIG;
+ };
+
+Required properties:
+- pinmux: integer array, represents gpio pin number and mux setting.
+ Supported pin number and mux varies for different SoCs, and are defined in
+ dt-bindings/pinctrl/<soc>-pinfunc.h directly.
+ These defines are calculated as:
+ ((port * 16 + line) << 8) | function
+ With:
+ - port: The gpio port index (PA = 0, PB = 1, ..., PK = 11)
+ - line: The line offset within the port (PA0 = 0, PA1 = 1, ..., PA15 = 15)
+ - function: The function number, can be:
+ * 0 : GPIO IN
+ * 1 : Alternate Function 0
+ * 2 : Alternate Function 1
+ * 3 : Alternate Function 2
+ * ...
+ * 16 : Alternate Function 15
+ * 17 : Analog
+ * 18 : GPIO OUT
+
+Optional properties:
+- GENERIC_PINCONFIG: is the generic pinconfig options to use.
+ Available options are:
+ - bias-disable,
+ - bias-pull-down,
+ - bias-pull-up,
+ - drive-push-pull,
+ - drive-open-drain,
+ - output-low
+ - output-high
+ - slew-rate = <x>, with x being:
+ < 0 > : Low speed
+ < 1 > : Medium speed
+ < 2 > : Fast speed
+ < 3 > : High speed
+
+Example:
+
+pin-controller {
+...
+ usart1_pins_a: usart1@0 {
+ pins1 {
+ pinmux = <STM32F429_PA9_FUNC_USART1_TX>;
+ bias-disable;
+ drive-push-pull;
+ slew-rate = <0>;
+ };
+ pins2 {
+ pinmux = <STM32F429_PA10_FUNC_USART1_RX>;
+ bias-disable;
+ };
+ };
+};
+
+&usart1 {
+ pinctrl-0 = <&usart1_pins_a>;
+ pinctrl-names = "default";
+ status = "okay";
+};
the GPIO definitions and pin control functions for each available multiplex
function.
+config PINCTRL_STM32
+ bool "ST STM32 pin control driver"
+ depends on DM
+ help
+ Supports pin multiplexing control on stm32 SoCs. The driver is
+ controlled by a device tree node which contains both the GPIO
+ definitions and pin control functions for each available multiplex
+ function.
+
endif
source "drivers/pinctrl/meson/Kconfig"
obj-$(CONFIG_PINCTRL_MESON) += meson/
obj-$(CONFIG_PINCTRL_MVEBU) += mvebu/
obj-$(CONFIG_PINCTRL_STI) += pinctrl-sti.o
+obj-$(CONFIG_PINCTRL_STM32) += pinctrl_stm32.o
--- /dev/null
+#include <common.h>
+#include <asm/arch/gpio.h>
+#include <dm.h>
+#include <dm/pinctrl.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int prep_gpio_dsc(struct stm32_gpio_dsc *gpio_dsc, u32 port_pin)
+{
+ gpio_dsc->port = (port_pin & 0xF000) >> 12;
+ gpio_dsc->pin = (port_pin & 0x0F00) >> 8;
+ debug("%s: GPIO:port= %d, pin= %d\n", __func__, gpio_dsc->port,
+ gpio_dsc->pin);
+
+ return 0;
+}
+
+static int prep_gpio_ctl(struct stm32_gpio_ctl *gpio_ctl, u32 gpio_fn, int node)
+{
+ gpio_fn &= 0x00FF;
+
+ switch (gpio_fn) {
+ case 0:
+ gpio_ctl->mode = STM32_GPIO_MODE_IN;
+ break;
+ case 1 ... 16:
+ gpio_ctl->mode = STM32_GPIO_MODE_AF;
+ gpio_ctl->af = gpio_fn - 1;
+ break;
+ case 17:
+ gpio_ctl->mode = STM32_GPIO_MODE_AN;
+ break;
+ default:
+ gpio_ctl->mode = STM32_GPIO_MODE_OUT;
+ break;
+ }
+
+ gpio_ctl->speed = fdtdec_get_int(gd->fdt_blob, node, "slew-rate", 0);
+
+ if (fdtdec_get_bool(gd->fdt_blob, node, "drive-open-drain"))
+ gpio_ctl->otype = STM32_GPIO_OTYPE_OD;
+ else
+ gpio_ctl->otype = STM32_GPIO_OTYPE_PP;
+
+ if (fdtdec_get_bool(gd->fdt_blob, node, "bias-pull-up"))
+ gpio_ctl->pupd = STM32_GPIO_PUPD_UP;
+ else if (fdtdec_get_bool(gd->fdt_blob, node, "bias-pull-down"))
+ gpio_ctl->pupd = STM32_GPIO_PUPD_DOWN;
+ else
+ gpio_ctl->pupd = STM32_GPIO_PUPD_NO;
+
+ debug("%s: gpio fn= %d, slew-rate= %x, op type= %x, pull-upd is = %x\n",
+ __func__, gpio_fn, gpio_ctl->speed, gpio_ctl->otype,
+ gpio_ctl->pupd);
+
+ return 0;
+}
+
+static int stm32_pinctrl_set_state_simple(struct udevice *dev,
+ struct udevice *periph)
+{
+ u32 pin_mux[50];
+ struct fdtdec_phandle_args args;
+ int rv, len;
+
+ /* Get node pinctrl-0 */
+ rv = fdtdec_parse_phandle_with_args(gd->fdt_blob, periph->of_offset,
+ "pinctrl-0", 0, 0, 0, &args);
+ if (rv)
+ return rv;
+ /*
+ * check for "pinmux" property in each subnode (e.g. pins1 and pins2 for
+ * usart1) of pin controller phandle "pinctrl-0"
+ * */
+ fdt_for_each_subnode(args.node, gd->fdt_blob, args.node) {
+ struct stm32_gpio_dsc gpio_dsc;
+ struct stm32_gpio_ctl gpio_ctl;
+ int i;
+
+ len = fdtdec_get_int_array_count(gd->fdt_blob, args.node,
+ "pinmux", pin_mux,
+ ARRAY_SIZE(pin_mux));
+ debug("%s: periph->name = %s, no of pinmux entries= %d\n",
+ __func__, periph->name, len);
+ if (len < 0)
+ return -EINVAL;
+ for (i = 0; i < len; i++) {
+ debug("%s: pinmux = %x\n", __func__, *(pin_mux + i));
+ prep_gpio_dsc(&gpio_dsc, *(pin_mux + i));
+ prep_gpio_ctl(&gpio_ctl, *(pin_mux + i), args.node);
+
+ rv = stm32_gpio_config(&gpio_dsc, &gpio_ctl);
+ debug("%s: rv = %d\n\n", __func__, rv);
+ if (rv)
+ return rv;
+ }
+ }
+
+ return 0;
+}
+
+static struct pinctrl_ops stm32_pinctrl_ops = {
+ .set_state_simple = stm32_pinctrl_set_state_simple,
+};
+
+static const struct udevice_id stm32_pinctrl_ids[] = {
+ { .compatible = "st,stm32f746-pinctrl" },
+ { }
+};
+
+U_BOOT_DRIVER(pinctrl_stm32) = {
+ .name = "pinctrl_stm32",
+ .id = UCLASS_PINCTRL,
+ .of_match = stm32_pinctrl_ids,
+ .ops = &stm32_pinctrl_ops,
+ .bind = dm_scan_fdt_dev,
+};
projects / u-boot / commitdiff