Messages in this thread Patch in this message | | | From | Shawn Guo <> | Subject | [PATCH 1/3] serial/imx: add device tree support | Date | Sat, 18 Jun 2011 23:19:12 +0800 |
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It adds device tree data parsing support for imx tty/serial driver.
Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com> Signed-off-by: Jason Liu <jason.hui@linaro.org> Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Cc: Sascha Hauer <s.hauer@pengutronix.de> --- .../bindings/tty/serial/fsl-imx-uart.txt | 21 +++++ drivers/tty/serial/imx.c | 81 +++++++++++++++++--- 2 files changed, 92 insertions(+), 10 deletions(-) create mode 100644 Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt
diff --git a/Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt b/Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt new file mode 100644 index 0000000..7648e17 --- /dev/null +++ b/Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt @@ -0,0 +1,21 @@ +* Freescale i.MX Universal Asynchronous Receiver/Transmitter (UART) + +Required properties: +- compatible : should be "fsl,<soc>-uart", "fsl,imx-uart" +- reg : address and length of the register set for the device +- interrupts : should contain uart interrupt +- id : should be the port ID defined by soc + +Optional properties: +- fsl,has-rts-cts : indicate it has rts-cts +- fsl,irda-mode : support irda mode + +Example: + +uart@73fbc000 { + compatible = "fsl,imx51-uart", "fsl,imx-uart"; + reg = <0x73fbc000 0x4000>; + interrupts = <31>; + id = <1>; + fsl,has-rts-cts; +}; diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index a544731..2769353 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -45,6 +45,8 @@ #include <linux/delay.h> #include <linux/rational.h> #include <linux/slab.h> +#include <linux/of.h> +#include <linux/of_address.h> #include <asm/io.h> #include <asm/irq.h> @@ -1223,6 +1225,63 @@ static int serial_imx_resume(struct platform_device *dev) return 0; } +#ifdef CONFIG_OF +static int serial_imx_probe_dt(struct imx_port *sport, + struct platform_device *pdev) +{ + struct device_node *node = pdev->dev.of_node; + const __be32 *line; + + if (!node) + return -ENODEV; + + line = of_get_property(node, "id", NULL); + if (!line) + return -ENODEV; + + sport->port.line = be32_to_cpup(line) - 1; + + if (of_get_property(node, "fsl,has-rts-cts", NULL)) + sport->have_rtscts = 1; + + if (of_get_property(node, "fsl,irda-mode", NULL)) + sport->use_irda = 1; + + return 0; +} + +static struct of_device_id imx_uart_dt_ids[] = { + { .compatible = "fsl,imx-uart" }, + {}, +}; +#else +static int serial_imx_probe_dt(struct imx_port *sport, + struct platform_device *pdev) +{ + return -ENODEV; +} +#define imx_uart_dt_ids NULL +#endif + +static int serial_imx_probe_pdata(struct imx_port *sport, + struct platform_device *pdev) +{ + struct imxuart_platform_data *pdata = pdev->dev.platform_data; + + if (!pdata) + return 0; + + if (pdata->flags & IMXUART_HAVE_RTSCTS) + sport->have_rtscts = 1; + + if (pdata->flags & IMXUART_IRDA) + sport->use_irda = 1; + + sport->port.line = pdev->id; + + return 0; +} + static int serial_imx_probe(struct platform_device *pdev) { struct imx_port *sport; @@ -1235,6 +1294,12 @@ static int serial_imx_probe(struct platform_device *pdev) if (!sport) return -ENOMEM; + ret = serial_imx_probe_dt(sport, pdev); + if (ret == -ENODEV) + ret = serial_imx_probe_pdata(sport, pdev); + if (ret) + goto free; + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { ret = -ENODEV; @@ -1259,7 +1324,6 @@ static int serial_imx_probe(struct platform_device *pdev) sport->port.fifosize = 32; sport->port.ops = &imx_pops; sport->port.flags = UPF_BOOT_AUTOCONF; - sport->port.line = pdev->id; init_timer(&sport->timer); sport->timer.function = imx_timeout; sport->timer.data = (unsigned long)sport; @@ -1273,17 +1337,13 @@ static int serial_imx_probe(struct platform_device *pdev) sport->port.uartclk = clk_get_rate(sport->clk); - imx_ports[pdev->id] = sport; + if (imx_ports[sport->port.line]) { + ret = -EBUSY; + goto clkput; + } + imx_ports[sport->port.line] = sport; pdata = pdev->dev.platform_data; - if (pdata && (pdata->flags & IMXUART_HAVE_RTSCTS)) - sport->have_rtscts = 1; - -#ifdef CONFIG_IRDA - if (pdata && (pdata->flags & IMXUART_IRDA)) - sport->use_irda = 1; -#endif - if (pdata && pdata->init) { ret = pdata->init(pdev); if (ret) @@ -1344,6 +1404,7 @@ static struct platform_driver serial_imx_driver = { .driver = { .name = "imx-uart", .owner = THIS_MODULE, + .of_match_table = imx_uart_dt_ids, }, }; -- 1.7.4.1
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