drivers: serial: Added support for raspberry pi
Added a serial driver for the RP2040. Only polling API is supported. Signed-off-by: Yonatan Schachter <yonatan.schachter@gmail.com>
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7 changed files with 122 additions and 0 deletions
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@ -354,6 +354,7 @@
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/drivers/serial/uart_mcux_iuart.c @Mani-Sadhasivam
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/drivers/serial/Kconfig.rtt @carlescufi @pkral78
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/drivers/serial/uart_rtt.c @carlescufi @pkral78
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/drivers/serial/*rpi_pico* @yonsch
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/drivers/serial/Kconfig.xlnx @wjliang
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/drivers/serial/uart_xlnx_ps.c @wjliang
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/drivers/serial/uart_xlnx_uartlite.c @henrikbrixandersen
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@ -32,6 +32,7 @@ zephyr_library_sources_ifdef(CONFIG_UART_SAM0 uart_sam0.c)
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zephyr_library_sources_ifdef(CONFIG_UART_PSOC6 uart_psoc6.c)
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zephyr_library_sources_ifdef(CONFIG_UART_PL011 uart_pl011.c)
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zephyr_library_sources_ifdef(CONFIG_UART_RV32M1_LPUART uart_rv32m1_lpuart.c)
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zephyr_library_sources_ifdef(CONFIG_UART_RPI_PICO uart_rpi_pico.c)
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zephyr_library_sources_ifdef(CONFIG_UART_LITEUART uart_liteuart.c)
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zephyr_library_sources_ifdef(CONFIG_UART_RTT_DRIVER uart_rtt.c)
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zephyr_library_sources_ifdef(CONFIG_UART_XLNX_PS uart_xlnx_ps.c)
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@ -159,6 +159,8 @@ source "drivers/serial/Kconfig.pl011"
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source "drivers/serial/Kconfig.rv32m1_lpuart"
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source "drivers/serial/Kconfig.rpi_pico"
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source "drivers/serial/Kconfig.litex"
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source "drivers/serial/Kconfig.rtt"
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11
drivers/serial/Kconfig.rpi_pico
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11
drivers/serial/Kconfig.rpi_pico
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@ -0,0 +1,11 @@
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# Copyright (c) 2021 Yonatan Schachter
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# SPDX-License-Identifier: Apache-2.0
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# Workaround for not being able to have commas in macro arguments
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DT_COMPAT_RPI_PICO_UART := raspberrypi,pico-uart
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config UART_RPI_PICO
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bool "Raspberry Pi UART driver"
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default $(dt_compat_enabled,$(DT_COMPAT_RPI_PICO_UART))
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select SERIAL_HAS_DRIVER
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select PICOSDK_USE_UART
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75
drivers/serial/uart_rpi_pico.c
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75
drivers/serial/uart_rpi_pico.c
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@ -0,0 +1,75 @@
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/*
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* Copyright (c) 2021, Yonatan Schachter
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <drivers/uart.h>
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#include <drivers/pinctrl.h>
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/* pico-sdk includes */
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#include <hardware/uart.h>
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#define DT_DRV_COMPAT raspberrypi_pico_uart
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struct uart_rpi_config {
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uart_inst_t *const uart_dev;
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uint32_t baudrate;
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const struct pinctrl_dev_config *pcfg;
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};
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static int uart_rpi_poll_in(const struct device *dev, unsigned char *c)
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{
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const struct uart_rpi_config *config = dev->config;
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if (!uart_is_readable(config->uart_dev)) {
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return -1;
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}
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*c = (unsigned char)uart_get_hw(config->uart_dev)->dr;
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return 0;
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}
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static void uart_rpi_poll_out(const struct device *dev, unsigned char c)
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{
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const struct uart_rpi_config *config = dev->config;
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uart_putc_raw(config->uart_dev, c);
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}
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static int uart_rpi_init(const struct device *dev)
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{
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const struct uart_rpi_config *config = dev->config;
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int ret;
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ret = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);
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if (ret < 0) {
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return ret;
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}
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uart_init(config->uart_dev, config->baudrate);
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return 0;
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}
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static const struct uart_driver_api uart_rpi_driver_api = {
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.poll_in = uart_rpi_poll_in,
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.poll_out = uart_rpi_poll_out,
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};
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#define RPI_UART_INIT(idx) \
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PINCTRL_DT_INST_DEFINE(idx); \
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static const struct uart_rpi_config uart_rpi_cfg_##idx = { \
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.uart_dev = (uart_inst_t *)DT_INST_REG_ADDR(idx), \
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.baudrate = DT_INST_PROP(idx, current_speed), \
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.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(idx), \
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}; \
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\
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DEVICE_DT_INST_DEFINE(idx, &uart_rpi_init, \
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NULL, \
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NULL, \
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&uart_rpi_cfg_##idx, PRE_KERNEL_1, \
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CONFIG_SERIAL_INIT_PRIORITY, \
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&uart_rpi_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(RPI_UART_INIT)
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@ -50,6 +50,26 @@
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status = "okay";
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label = "PINCTRL";
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};
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uart0: uart@40034000 {
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compatible = "raspberrypi,pico-uart";
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reg = <0x40034000 DT_SIZE_K(4)>;
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clocks = <&peripheral_clk>;
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interrupts = <20 RPI_PICO_DEFAULT_IRQ_PRIORITY>;
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interrupt-names = "uart0";
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label = "UART_0";
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status = "disabled";
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};
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uart1: uart@40038000 {
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compatible = "raspberrypi,pico-uart";
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reg = <0x40038000 DT_SIZE_K(4)>;
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clocks = <&peripheral_clk>;
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interrupts = <21 RPI_PICO_DEFAULT_IRQ_PRIORITY>;
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interrupt-names = "uart1";
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label = "UART_1";
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status = "disabled";
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};
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};
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};
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12
dts/bindings/serial/raspberrypi,pico-uart.yaml
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12
dts/bindings/serial/raspberrypi,pico-uart.yaml
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description: Raspberry Pi Pico UART
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compatible: "raspberrypi,pico-uart"
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include: [uart-controller.yaml, pinctrl-device.yaml]
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properties:
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reg:
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required: true
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interrupts:
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required: true
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