linux-kernel - Re: [PATCH v2 1/2] uio: uio_pdrv_genirq: Make UIO name controllable via DT node property

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Date:   Tue, 27 Aug 2019 18:07:04 +0200
From:   Daniel Mack <daniel@...que.org>
To:     gregkh@...uxfoundation.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] uio: uio_pdrv_genirq: Make UIO name controllable
 via DT node property

Hi Greg,

On 15/8/2019 11:28 PM, Daniel Mack wrote:
> When probed via DT, the uio_pdrv_genirq driver currently uses the name
> of the node and exposes that as name of the UIO device to userspace.
> 
> This doesn't work for systems where multiple nodes with the same name
> (but different unit addresses) are present, or for systems where the
> node names are auto-generated by a third-party tool.
> 
> This patch adds the possibility to read the UIO name from the optional
> "linux,uio-name" property.

Any opinion on this one?


Thanks,
Daniel


> 
> Signed-off-by: Daniel Mack <daniel@...que.org>
> ---
>  drivers/uio/uio_pdrv_genirq.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/uio/uio_pdrv_genirq.c b/drivers/uio/uio_pdrv_genirq.c
> index 6c759934bff3..24d60eb1bda5 100644
> --- a/drivers/uio/uio_pdrv_genirq.c
> +++ b/drivers/uio/uio_pdrv_genirq.c
> @@ -105,12 +105,15 @@ 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 = dev_get_platdata(&pdev->dev);
> +	struct device_node *node = pdev->dev.of_node;
>  	struct uio_pdrv_genirq_platdata *priv;
>  	struct uio_mem *uiomem;
>  	int ret = -EINVAL;
>  	int i;
>  
> -	if (pdev->dev.of_node) {
> +	if (node) {
> +		const char *name;
> +
>  		/* alloc uioinfo for one device */
>  		uioinfo = devm_kzalloc(&pdev->dev, sizeof(*uioinfo),
>  				       GFP_KERNEL);
> @@ -118,8 +121,13 @@ static int uio_pdrv_genirq_probe(struct platform_device *pdev)
>  			dev_err(&pdev->dev, "unable to kmalloc\n");
>  			return -ENOMEM;
>  		}
> -		uioinfo->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOFn",
> -					       pdev->dev.of_node);
> +
> +		if (!of_property_read_string(node, "linux,uio-name", &name))
> +			uioinfo->name = devm_kstrdup(&pdev->dev, name, GFP_KERNEL);
> +		else
> +			uioinfo->name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
> +						       "%pOFn", node);
> +
>  		uioinfo->version = "devicetree";
>  		/* Multiple IRQs are not supported */
>  	}
>