diff options
| -rw-r--r-- | Documentation/devicetree/bindings/serial/altera_uart.txt | 7 | ||||
| -rw-r--r-- | drivers/tty/serial/altera_uart.c | 51 |
2 files changed, 54 insertions, 4 deletions
diff --git a/Documentation/devicetree/bindings/serial/altera_uart.txt b/Documentation/devicetree/bindings/serial/altera_uart.txt new file mode 100644 index 000000000000..71cae3f70100 --- /dev/null +++ b/Documentation/devicetree/bindings/serial/altera_uart.txt @@ -0,0 +1,7 @@ +Altera UART + +Required properties: +- compatible : should be "ALTR,uart-1.0" + +Optional properties: +- clock-frequency : frequency of the clock input to the UART diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c index 721216292a50..1803c37d58ab 100644 --- a/drivers/tty/serial/altera_uart.c +++ b/drivers/tty/serial/altera_uart.c @@ -24,6 +24,7 @@ #include <linux/serial.h> #include <linux/serial_core.h> #include <linux/platform_device.h> +#include <linux/of.h> #include <linux/io.h> #include <linux/altera_uart.h> @@ -511,6 +512,29 @@ static struct uart_driver altera_uart_driver = { .cons = ALTERA_UART_CONSOLE, }; +#ifdef CONFIG_OF +static int altera_uart_get_of_uartclk(struct platform_device *pdev, + struct uart_port *port) +{ + int len; + const __be32 *clk; + + clk = of_get_property(pdev->dev.of_node, "clock-frequency", &len); + if (!clk || len < sizeof(__be32)) + return -ENODEV; + + port->uartclk = be32_to_cpup(clk); + + return 0; +} +#else +static int altera_uart_get_of_uartclk(struct platform_device *pdev, + struct uart_port *port) +{ + return -ENODEV; +} +#endif /* CONFIG_OF */ + static int __devinit altera_uart_probe(struct platform_device *pdev) { struct altera_uart_platform_uart *platp = pdev->dev.platform_data; @@ -518,6 +542,7 @@ static int __devinit altera_uart_probe(struct platform_device *pdev) struct resource *res_mem; struct resource *res_irq; int i = pdev->id; + int ret; /* -1 emphasizes that the platform must have one port, no .N suffix */ if (i == -1) @@ -542,6 +567,15 @@ static int __devinit altera_uart_probe(struct platform_device *pdev) else if (platp->irq) port->irq = platp->irq; + /* Check platform data first so we can override device node data */ + if (platp) + port->uartclk = platp->uartclk; + else { + ret = altera_uart_get_of_uartclk(pdev, port); + if (ret) + return ret; + } + port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE); if (!port->membase) return -ENOMEM; @@ -549,7 +583,6 @@ static int __devinit altera_uart_probe(struct platform_device *pdev) port->line = i; port->type = PORT_ALTERA_UART; port->iotype = SERIAL_IO_MEM; - port->uartclk = platp->uartclk; port->ops = &altera_uart_ops; port->flags = UPF_BOOT_AUTOCONF; port->private_data = platp; @@ -567,13 +600,23 @@ static int __devexit altera_uart_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_OF +static struct of_device_id altera_uart_match[] = { + { .compatible = "ALTR,uart-1.0", }, + {}, +}; +MODULE_DEVICE_TABLE(of, altera_uart_match); +#else +#define altera_uart_match NULL +#endif /* CONFIG_OF */ + static struct platform_driver altera_uart_platform_driver = { .probe = altera_uart_probe, .remove = __devexit_p(altera_uart_remove), .driver = { - .name = DRV_NAME, - .owner = THIS_MODULE, - .pm = NULL, + .name = DRV_NAME, + .owner = THIS_MODULE, + .of_match_table = altera_uart_match, }, }; |