On Mon, Jun 18, 2012 at 10:06:09AM -0300, Fabio Estevam wrote:
> Allow device tree probing.
>
> Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
> Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
> Cc: Alan Cox <alan@xxxxxxxxxxxxxxx>
> Cc: <linux-serial@xxxxxxxxxxxxxxx>
> Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
> ---
> Changes since v3:
> - Remove unneeded mxs_auart_devtype
> Changes since v2:
> - Change compatible string
> - Add aliases information in bindings doc
> - Remove unneeded mxs_auart_probe_pdev function
> - Remove "ifdef CONFIG_OF"
> - Remove of_match_ptr wrapper
> Changes since v1:
> - Merged patches 3 and 5 from v1 into this one
Hi Greg,
May I have your ack to have the patch go through arm-soc tree, so that
we can possibly start converting those non-DT board files over to DT?
Regards,
Shawn
> .../bindings/tty/serial/fsl-mxs-auart.txt | 27 +++++++++++++
> drivers/tty/serial/mxs-auart.c | 40 +++++++++++++++++++-
> 2 files changed, 66 insertions(+), 1 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 0000000..2ee903f
> --- /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,<soc>-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 ec56d83..103087d 100644
> --- a/drivers/tty/serial/mxs-auart.c
> +++ b/drivers/tty/serial/mxs-auart.c
> @@ -33,6 +33,7 @@
> #include <linux/delay.h>
> #include <linux/io.h>
> #include <linux/pinctrl/consumer.h>
> +#include <linux/of_device.h>
>
> #include <asm/cacheflush.h>
>
> @@ -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;
> @@ -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");
> --
> 1.7.1
>
>
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