From 1ea6607d4cdc917987e7e6cfaafc4a630d97a297 Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Mon, 18 Jun 2012 10:06:09 -0300 Subject: [PATCH] serial: mxs-auart: Allow device tree probing Allow device tree probing. Cc: Grant Likely Cc: Rob Herring Cc: Alan Cox Cc: Signed-off-by: Fabio Estevam Signed-off-by: Subodh Nijsure Acked-by: Greg Kroah-Hartman Signed-off-by: Shawn Guo --- .../bindings/tty/serial/fsl-mxs-auart.txt | 27 ++++++++++++ drivers/tty/serial/mxs-auart.c | 42 ++++++++++++++++++- 2 files changed, 67 insertions(+), 2 deletions(-) create mode 100644 Documentation/devicetree/bindings/tty/serial/fsl-mxs-auart.txt diff --git a/Documentation/devicetree/bindings/tty/serial/fsl-mxs-auart.txt b/Documentation/devicetree/bindings/tty/serial/fsl-mxs-auart.txt new file mode 100644 index 000000000000..2ee903fad25c --- /dev/null +++ b/Documentation/devicetree/bindings/tty/serial/fsl-mxs-auart.txt @@ -0,0 +1,27 @@ +* Freescale MXS Application UART (AUART) + +Required properties: +- compatible : Should be "fsl,-auart". The supported SoCs include + imx23 and imx28. +- reg : Address and length of the register set for the device +- interrupts : Should contain the auart interrupt numbers + +Example: +auart0: serial@8006a000 { + compatible = "fsl,imx28-auart", "fsl,imx23-auart"; + reg = <0x8006a000 0x2000>; + interrupts = <112 70 71>; +}; + +Note: Each auart port should have an alias correctly numbered in "aliases" +node. + +Example: + +aliases { + serial0 = &auart0; + serial1 = &auart1; + serial2 = &auart2; + serial3 = &auart3; + serial4 = &auart4; +}; diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c index ec56d8397aae..2e341b81ff89 100644 --- a/drivers/tty/serial/mxs-auart.c +++ b/drivers/tty/serial/mxs-auart.c @@ -33,6 +33,7 @@ #include #include #include +#include #include @@ -675,6 +676,30 @@ static struct uart_driver auart_driver = { #endif }; +/* + * This function returns 1 if pdev isn't a device instatiated by dt, 0 if it + * could successfully get all information from dt or a negative errno. + */ +static int serial_mxs_probe_dt(struct mxs_auart_port *s, + struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + int ret; + + if (!np) + /* no device tree device */ + return 1; + + ret = of_alias_get_id(np, "serial"); + if (ret < 0) { + dev_err(&pdev->dev, "failed to get alias id: %d\n", ret); + return ret; + } + s->port.line = ret; + + return 0; +} + static int __devinit mxs_auart_probe(struct platform_device *pdev) { struct mxs_auart_port *s; @@ -689,6 +714,12 @@ static int __devinit mxs_auart_probe(struct platform_device *pdev) goto out; } + ret = serial_mxs_probe_dt(s, pdev); + if (ret > 0) + s->port.line = pdev->id < 0 ? 0 : pdev->id; + else if (ret < 0) + goto out_free; + pinctrl = devm_pinctrl_get_select_default(&pdev->dev); if (IS_ERR(pinctrl)) { ret = PTR_ERR(pinctrl); @@ -711,7 +742,6 @@ static int __devinit mxs_auart_probe(struct platform_device *pdev) s->port.membase = ioremap(r->start, resource_size(r)); s->port.ops = &mxs_auart_ops; s->port.iotype = UPIO_MEM; - s->port.line = pdev->id < 0 ? 0 : pdev->id; s->port.fifosize = 16; s->port.uartclk = clk_get_rate(s->clk); s->port.type = PORT_IMX; @@ -728,7 +758,7 @@ static int __devinit mxs_auart_probe(struct platform_device *pdev) platform_set_drvdata(pdev, s); - auart_port[pdev->id] = s; + auart_port[s->port.line] = s; mxs_auart_reset(&s->port); @@ -769,12 +799,19 @@ static int __devexit mxs_auart_remove(struct platform_device *pdev) return 0; } +static struct of_device_id mxs_auart_dt_ids[] = { + { .compatible = "fsl,imx23-auart", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mxs_auart_dt_ids); + static struct platform_driver mxs_auart_driver = { .probe = mxs_auart_probe, .remove = __devexit_p(mxs_auart_remove), .driver = { .name = "mxs-auart", .owner = THIS_MODULE, + .of_match_table = mxs_auart_dt_ids, }, }; @@ -807,3 +844,4 @@ module_init(mxs_auart_init); module_exit(mxs_auart_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Freescale MXS application uart driver"); +MODULE_ALIAS("platform:mxs-auart");