This driver uses the same pin control binding as that of linux, binding document of this patch is copied from linux. One addition done is for GPIO input and output mode configuration which was missing. Signed-off-by: Vikas Manocha <vikas.manocha@st.com> Reviewed-by: Simon Glass <sjg@chromium.org>master
Vikas Manocha
8 years ago
committed by
Tom Rini
parent
b5be8f5ea8
commit
94d5308412
@ -0,0 +1,133 @@ |
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* STM32 GPIO and Pin Mux/Config controller |
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|
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STMicroelectronics's STM32 MCUs intregrate a GPIO and Pin mux/config hardware |
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controller. It controls the input/output settings on the available pins and |
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also provides ability to multiplex and configure the output of various on-chip |
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controllers onto these pads. |
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|
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Pin controller node: |
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Required properies: |
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- compatible: value should be one of the following: |
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(a) "st,stm32f429-pinctrl" |
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(b) "st,stm32f746-pinctrl" |
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- #address-cells: The value of this property must be 1 |
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- #size-cells : The value of this property must be 1 |
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- ranges : defines mapping between pin controller node (parent) to |
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gpio-bank node (children). |
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- pins-are-numbered: Specify the subnodes are using numbered pinmux to |
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specify pins. |
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|
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GPIO controller/bank node: |
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Required properties: |
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- gpio-controller : Indicates this device is a GPIO controller |
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- #gpio-cells : Should be two. |
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The first cell is the pin number |
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The second one is the polarity: |
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- 0 for active high |
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- 1 for active low |
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- reg : The gpio address range, relative to the pinctrl range |
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- clocks : clock that drives this bank |
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- st,bank-name : Should be a name string for this bank as specified in |
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the datasheet |
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|
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Optional properties: |
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- reset: : Reference to the reset controller |
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- interrupt-parent: phandle of the interrupt parent to which the external |
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GPIO interrupts are forwarded to. |
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- st,syscfg: Should be phandle/offset pair. The phandle to the syscon node |
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which includes IRQ mux selection register, and the offset of the IRQ mux |
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selection register. |
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|
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Example: |
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#include <dt-bindings/pinctrl/stm32f429-pinfunc.h> |
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... |
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|
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pin-controller { |
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#address-cells = <1>; |
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#size-cells = <1>; |
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compatible = "st,stm32f429-pinctrl"; |
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ranges = <0 0x40020000 0x3000>; |
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pins-are-numbered; |
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|
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gpioa: gpio@40020000 { |
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gpio-controller; |
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#gpio-cells = <2>; |
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reg = <0x0 0x400>; |
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resets = <&reset_ahb1 0>; |
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st,bank-name = "GPIOA"; |
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}; |
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... |
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pin-functions nodes follow... |
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}; |
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|
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Contents of function subnode node: |
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---------------------------------- |
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Subnode format |
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A pinctrl node should contain at least one subnode representing the |
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pinctrl group available on the machine. Each subnode will list the |
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pins it needs, and how they should be configured, with regard to muxer |
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configuration, pullups, drive, output high/low and output speed. |
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|
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node { |
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pinmux = <PIN_NUMBER_PINMUX>; |
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GENERIC_PINCONFIG; |
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}; |
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|
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Required properties: |
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- pinmux: integer array, represents gpio pin number and mux setting. |
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Supported pin number and mux varies for different SoCs, and are defined in |
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dt-bindings/pinctrl/<soc>-pinfunc.h directly. |
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These defines are calculated as: |
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((port * 16 + line) << 8) | function |
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With: |
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- port: The gpio port index (PA = 0, PB = 1, ..., PK = 11) |
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- line: The line offset within the port (PA0 = 0, PA1 = 1, ..., PA15 = 15) |
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- function: The function number, can be: |
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* 0 : GPIO IN |
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* 1 : Alternate Function 0 |
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* 2 : Alternate Function 1 |
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* 3 : Alternate Function 2 |
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* ... |
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* 16 : Alternate Function 15 |
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* 17 : Analog |
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* 18 : GPIO OUT |
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|
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Optional properties: |
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- GENERIC_PINCONFIG: is the generic pinconfig options to use. |
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Available options are: |
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- bias-disable, |
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- bias-pull-down, |
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- bias-pull-up, |
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- drive-push-pull, |
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- drive-open-drain, |
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- output-low |
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- output-high |
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- slew-rate = <x>, with x being: |
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< 0 > : Low speed |
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< 1 > : Medium speed |
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< 2 > : Fast speed |
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< 3 > : High speed |
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|
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Example: |
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pin-controller { |
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... |
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usart1_pins_a: usart1@0 { |
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pins1 { |
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pinmux = <STM32F429_PA9_FUNC_USART1_TX>; |
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bias-disable; |
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drive-push-pull; |
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slew-rate = <0>; |
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}; |
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pins2 { |
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pinmux = <STM32F429_PA10_FUNC_USART1_RX>; |
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bias-disable; |
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}; |
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}; |
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}; |
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|
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&usart1 { |
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pinctrl-0 = <&usart1_pins_a>; |
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pinctrl-names = "default"; |
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status = "okay"; |
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}; |
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@ -0,0 +1,117 @@ |
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#include <common.h> |
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#include <asm/arch/gpio.h> |
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#include <dm.h> |
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#include <dm/pinctrl.h> |
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DECLARE_GLOBAL_DATA_PTR; |
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|
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static int prep_gpio_dsc(struct stm32_gpio_dsc *gpio_dsc, u32 port_pin) |
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{ |
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gpio_dsc->port = (port_pin & 0xF000) >> 12; |
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gpio_dsc->pin = (port_pin & 0x0F00) >> 8; |
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debug("%s: GPIO:port= %d, pin= %d\n", __func__, gpio_dsc->port, |
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gpio_dsc->pin); |
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return 0; |
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} |
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|
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static int prep_gpio_ctl(struct stm32_gpio_ctl *gpio_ctl, u32 gpio_fn, int node) |
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{ |
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gpio_fn &= 0x00FF; |
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|
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switch (gpio_fn) { |
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case 0: |
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gpio_ctl->mode = STM32_GPIO_MODE_IN; |
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break; |
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case 1 ... 16: |
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gpio_ctl->mode = STM32_GPIO_MODE_AF; |
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gpio_ctl->af = gpio_fn - 1; |
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break; |
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case 17: |
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gpio_ctl->mode = STM32_GPIO_MODE_AN; |
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break; |
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default: |
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gpio_ctl->mode = STM32_GPIO_MODE_OUT; |
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break; |
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} |
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gpio_ctl->speed = fdtdec_get_int(gd->fdt_blob, node, "slew-rate", 0); |
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|
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if (fdtdec_get_bool(gd->fdt_blob, node, "drive-open-drain")) |
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gpio_ctl->otype = STM32_GPIO_OTYPE_OD; |
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else |
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gpio_ctl->otype = STM32_GPIO_OTYPE_PP; |
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|
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if (fdtdec_get_bool(gd->fdt_blob, node, "bias-pull-up")) |
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gpio_ctl->pupd = STM32_GPIO_PUPD_UP; |
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else if (fdtdec_get_bool(gd->fdt_blob, node, "bias-pull-down")) |
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gpio_ctl->pupd = STM32_GPIO_PUPD_DOWN; |
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else |
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gpio_ctl->pupd = STM32_GPIO_PUPD_NO; |
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debug("%s: gpio fn= %d, slew-rate= %x, op type= %x, pull-upd is = %x\n", |
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__func__, gpio_fn, gpio_ctl->speed, gpio_ctl->otype, |
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gpio_ctl->pupd); |
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return 0; |
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} |
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|
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static int stm32_pinctrl_set_state_simple(struct udevice *dev, |
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struct udevice *periph) |
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{ |
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u32 pin_mux[50]; |
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struct fdtdec_phandle_args args; |
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int rv, len; |
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/* Get node pinctrl-0 */ |
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rv = fdtdec_parse_phandle_with_args(gd->fdt_blob, periph->of_offset, |
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"pinctrl-0", 0, 0, 0, &args); |
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if (rv) |
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return rv; |
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/*
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* check for "pinmux" property in each subnode (e.g. pins1 and pins2 for |
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* usart1) of pin controller phandle "pinctrl-0" |
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* */ |
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fdt_for_each_subnode(args.node, gd->fdt_blob, args.node) { |
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struct stm32_gpio_dsc gpio_dsc; |
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struct stm32_gpio_ctl gpio_ctl; |
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int i; |
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len = fdtdec_get_int_array_count(gd->fdt_blob, args.node, |
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"pinmux", pin_mux, |
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ARRAY_SIZE(pin_mux)); |
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debug("%s: periph->name = %s, no of pinmux entries= %d\n", |
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__func__, periph->name, len); |
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if (len < 0) |
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return -EINVAL; |
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for (i = 0; i < len; i++) { |
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debug("%s: pinmux = %x\n", __func__, *(pin_mux + i)); |
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prep_gpio_dsc(&gpio_dsc, *(pin_mux + i)); |
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prep_gpio_ctl(&gpio_ctl, *(pin_mux + i), args.node); |
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rv = stm32_gpio_config(&gpio_dsc, &gpio_ctl); |
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debug("%s: rv = %d\n\n", __func__, rv); |
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if (rv) |
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return rv; |
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} |
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} |
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return 0; |
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} |
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static struct pinctrl_ops stm32_pinctrl_ops = { |
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.set_state_simple = stm32_pinctrl_set_state_simple, |
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}; |
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static const struct udevice_id stm32_pinctrl_ids[] = { |
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{ .compatible = "st,stm32f746-pinctrl" }, |
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{ } |
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}; |
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U_BOOT_DRIVER(pinctrl_stm32) = { |
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.name = "pinctrl_stm32", |
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.id = UCLASS_PINCTRL, |
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.of_match = stm32_pinctrl_ids, |
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.ops = &stm32_pinctrl_ops, |
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.bind = dm_scan_fdt_dev, |
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}; |
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