From 94228f9561bb6c7eb951e415f5497db52cca40f7 Mon Sep 17 00:00:00 2001 From: Allen Yan Date: Fri, 13 Oct 2017 11:01:48 +0200 Subject: [PATCH] serial: mvebu-uart: support probe of multiple ports Until now, the mvebu-uart driver only supported probing a single UART port. However, some platforms have multiple instances of this UART controller, and therefore the driver should support multiple ports. In order to achieve this, we make sure to assign port->line properly, instead of hardcoding it to zero. Signed-off-by: Allen Yan Signed-off-by: Miquel Raynal Acked-by: Gregory CLEMENT Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/mvebu-uart.c | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c index 7e0a3e9..f3c7271 100644 --- a/drivers/tty/serial/mvebu-uart.c +++ b/drivers/tty/serial/mvebu-uart.c @@ -547,20 +547,36 @@ static struct uart_driver mvebu_uart_driver = { #endif }; +/* Counter to keep track of each UART port id when not using CONFIG_OF */ +static int uart_num_counter; + static int mvebu_uart_probe(struct platform_device *pdev) { struct resource *reg = platform_get_resource(pdev, IORESOURCE_MEM, 0); struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); struct uart_port *port; struct mvebu_uart_data *data; - int ret; + int ret, id; if (!reg || !irq) { dev_err(&pdev->dev, "no registers/irq defined\n"); return -EINVAL; } - port = &mvebu_uart_ports[0]; + /* Assume that all UART ports have a DT alias or none has */ + id = of_alias_get_id(pdev->dev.of_node, "serial"); + if (!pdev->dev.of_node || id < 0) + pdev->id = uart_num_counter++; + else + pdev->id = id; + + if (pdev->id >= MVEBU_NR_UARTS) { + dev_err(&pdev->dev, "cannot have more than %d UART ports\n", + MVEBU_NR_UARTS); + return -EINVAL; + } + + port = &mvebu_uart_ports[pdev->id]; spin_lock_init(&port->lock); @@ -572,7 +588,7 @@ static int mvebu_uart_probe(struct platform_device *pdev) port->fifosize = 32; port->iotype = UPIO_MEM32; port->flags = UPF_FIXED_PORT; - port->line = 0; /* single port: force line number to 0 */ + port->line = pdev->id; port->irq = irq->start; port->irqflags = 0; -- 2.7.4