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Date: Thu, 31 Mar 2011 10:43:48 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: Michal Simek <monstr@...str.eu>
Cc: devicetree-discuss@...ts.ozlabs.org, john.williams@...alogix.com,
linux-kernel@...r.kernel.org, hjk@...utronix.de, gregkh@...e.de
Subject: Re: [PATCH] uio/pdrv_genirq: Add OF support
On Thu, Mar 31, 2011 at 02:30:00PM +0200, Michal Simek wrote:
> Support OF support. "generic-uio" compatible property is used.
>
> Signed-off-by: Michal Simek <monstr@...str.eu>
> ---
> drivers/uio/uio_pdrv_genirq.c | 60 ++++++++++++++++++++++++++++++++++++++--
> 1 files changed, 57 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/uio/uio_pdrv_genirq.c b/drivers/uio/uio_pdrv_genirq.c
> index 7174d51..9e89806 100644
> --- a/drivers/uio/uio_pdrv_genirq.c
> +++ b/drivers/uio/uio_pdrv_genirq.c
> @@ -23,6 +23,10 @@
> #include <linux/pm_runtime.h>
> #include <linux/slab.h>
>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_address.h>
> +
> #define DRIVER_NAME "uio_pdrv_genirq"
>
> struct uio_pdrv_genirq_platdata {
> @@ -92,11 +96,44 @@ static int uio_pdrv_genirq_irqcontrol(struct uio_info *dev_info, s32 irq_on)
> static int uio_pdrv_genirq_probe(struct platform_device *pdev)
> {
> struct uio_info *uioinfo = pdev->dev.platform_data;
> - struct uio_pdrv_genirq_platdata *priv;
> + struct uio_pdrv_genirq_platdata *priv = NULL;
> struct uio_mem *uiomem;
> int ret = -EINVAL;
> int i;
>
> + if (!uioinfo) {
> + struct resource r_irq; /* Interrupt resources */
> + int rc = 0;
> +
> + rc = of_address_to_resource(pdev->dev.of_node, 0,
> + &pdev->resource[0]);
> + if (rc) {
> + dev_err(&pdev->dev, "invalid address\n");
> + goto bad2;
> + }
> + pdev->num_resources = 1;
You shouldn't need this anymore. Device tree sourced platform_devices
get their resource table populated automatically. Also, drivers
should /never/ modify the resource values set in the device because it
messes up driver rebinding.
> +
> + /* alloc uioinfo for one device */
> + uioinfo = kzalloc(sizeof(*uioinfo), GFP_KERNEL);
> + if (!uioinfo) {
> + ret = -ENOMEM;
> + dev_err(&pdev->dev, "unable to kmalloc\n");
> + goto bad2;
> + }
> + uioinfo->name = pdev->dev.of_node->name;
> + /* Use version for storing full IP name for identification */
> + uioinfo->version = pdev->dev.of_node->full_name;
Comment on the binding: You should probably use the first entry in the
compatible list for the name of the device. Node names should be
generic and usually they will say what a device does, but not what a
device actually /is/ (this is the Generic Names recommended practice).
Modern convention is to rely on the first compatible entry for
describing what ip block it is.
> +
> + /* Get IRQ for the device */
> + rc = of_irq_to_resource(pdev->dev.of_node, 0, &r_irq);
Ditto here, the pdev should already have the irq resource populated.
> + if (rc == NO_IRQ)
> + dev_err(&pdev->dev, "no IRQ found\n");
> + else {
> + uioinfo->irq = r_irq.start;
> + dev_info(&pdev->dev, "irq %d\n", (u32)uioinfo->irq);
> + }
> + }
> +
> if (!uioinfo || !uioinfo->name || !uioinfo->version) {
> dev_err(&pdev->dev, "missing platform_data\n");
> goto bad0;
> @@ -176,10 +213,15 @@ static int uio_pdrv_genirq_probe(struct platform_device *pdev)
>
> platform_set_drvdata(pdev, priv);
> return 0;
> - bad1:
> +
> +bad1:
> kfree(priv);
> pm_runtime_disable(&pdev->dev);
> - bad0:
> +bad0:
> + /* kfree uioinfo for CONFIG_OF */
> + if (!pdev->dev.platform_data)
> + kfree(uioinfo);
> +bad2:
> return ret;
> }
>
> @@ -215,6 +257,17 @@ static const struct dev_pm_ops uio_pdrv_genirq_dev_pm_ops = {
> .runtime_resume = uio_pdrv_genirq_runtime_nop,
> };
>
> +#ifdef CONFIG_OF
> +/* Match table for of_platform binding */
> +static const struct of_device_id __devinitconst uio_of_genirq_match[] = {
> + { .compatible = "generic-uio", },
> + { /* end of list */ },
> +};
> +MODULE_DEVICE_TABLE(of, uio_of_genirq_match);
> +#else
> +# define uio_of_genirq_match NULL
> +#endif
> +
> static struct platform_driver uio_pdrv_genirq = {
> .probe = uio_pdrv_genirq_probe,
> .remove = uio_pdrv_genirq_remove,
> @@ -222,6 +275,7 @@ static struct platform_driver uio_pdrv_genirq = {
> .name = DRIVER_NAME,
> .owner = THIS_MODULE,
> .pm = &uio_pdrv_genirq_dev_pm_ops,
> + .of_match_table = uio_of_genirq_match,
> },
> };
>
> --
> 1.5.5.6
>
--
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