Hy i am using the usart3 from the STM32MP157A-DK1. i orientated myself on the USART driver (https://elixir.bootlin.com/linux/latest/source/drivers/tty/serial/stm32-usart.c).
but
when i want to initialize the
port I get following error code “Rs453Network: probe of 4000f000.serial failed
with error 77�? on this methode stm32port->wakeirq = platform_get_irq(pdev, 1);
I have this device tree configuration:
Stm32mp15xx-dkx.dtsi
&usart3 {
pinctrl-names = "default", "sleep", "idle";
pinctrl-0 = <&usart3_pins_b>;
pinctrl-1 = <&usart3_sleep_pins_b>;
pinctrl-2 = <&usart3_idle_pins_b>;
uart-has-rtscts;
status = "okay";
};
Stm32mp157a-dk1.dts
aliases {
ethernet0 = ðernet0;
serial0 = &uart4;
//serial1 = &usart3;
serial2 = &uart7;
usart3 = &usart3;
};
this is the methode:
static int stm32_init_port(struct stm32_port *stm32port,
struct platform_device *pdev)
{
struct uart_port *port = &stm32port->port;
struct resource *res;
int ret;
port->iotype = UPIO_MEM;
port->flags = UPF_BOOT_AUTOCONF;
port->ops = &stm32_uart_ops;
port->dev = &pdev->dev;
port->fifosize = stm32port->info->cfg.fifosize;
ret = platform_get_irq(pdev, 0); //get an IRQ for a device
if (ret <= 0)
return ret ? : -ENODEV;
port->irq = ret;
port->rs485_config = stm32_config_rs485;
stm32_init_rs485(port, pdev);
if (stm32port->info->cfg.has_wakeup) {
stm32port->wakeirq = platform_get_irq(pdev, 1);
if (stm32port->wakeirq <= 0 && stm32port->wakeirq != -ENXIO)
return stm32port->wakeirq ? : -ENODEV;
}
stm32port->fifoen = stm32port->info->cfg.has_fifo;
/*get information on the structure of the device resource,
like start adress and end adress, in order to find the
resource memory size so you can map it in memory.*/
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
port->membase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(port->membase))
return PTR_ERR(port->membase);
port->mapbase = res->start;
spin_lock_init(&port->lock);
stm32port->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(stm32port->clk))
return PTR_ERR(stm32port->clk);
/* Ensure that clk rate is correct by enabling the clk */
ret = clk_prepare_enable(stm32port->clk);
if (ret)
return ret;
stm32port->port.uartclk = clk_get_rate(stm32port->clk);
if (!stm32port->port.uartclk) {
clk_disable_unprepare(stm32port->clk);
ret = -EINVAL;
}
return ret;
}
