[PATCH RFC] drivers/usb/ehci-fsl: Fix interrupt setup in host mode.

[Michael Ellerman]

Darren Stevens <darren at stevens-zone.net> writes:
> In patch a1a2b7125e1079 (Drop static setup of IRQ resource from DT
> core) we stopped platform_get_resource() from returning the IRQ, as all
> drivers were supposed to have switched to platform_get_irq()
> Unfortunately the Freescale EHCI driver in host mode got missed. Fix
> it. Also fix allocation of resources to work with current kernel.
>
> Fixes:a1a2b7125e1079 (Drop static setup of IRQ resource from DT core)
> Reported-by Christian Zigotzky <chzigotzky at xenosoft.de>
> Signed-off-by Darren Stevens <darren at stevens-zone.net>
> ---
> Tested on AmigaOne X5000/20 and X5000/40 not sure if this is entirely
> correct fix though. Contains code by Rob Herring (in fsl-mph-dr-of.c)

It looks like this driver is used on some arm/arm64 boards:

  $ git grep -l fsl-usb2-dr arch/arm*/boot/dts
  arch/arm/boot/dts/ls1021a.dtsi
  arch/arm64/boot/dts/freescale/fsl-ls1012a.dtsi

Which is for the "Layerscape-1012A family SoC".

Have we heard of any bug reports from users of those boards? Is it wired
up differently or otherwise immune to the problem?

I've added the Layerscape maintainers to Cc.

cheers

> diff --git a/drivers/usb/host/fsl-mph-dr-of.c
> b/drivers/usb/host/fsl-mph-dr-of.c index 44a7e58..766e4ab 100644
> --- a/drivers/usb/host/fsl-mph-dr-of.c
> +++ b/drivers/usb/host/fsl-mph-dr-of.c
> @@ -80,8 +80,6 @@ static struct platform_device
> *fsl_usb2_device_register( const char *name, int id)
>  {
>  	struct platform_device *pdev;
> -	const struct resource *res = ofdev->resource;
> -	unsigned int num = ofdev->num_resources;
>  	int retval;
>  
>  	pdev = platform_device_alloc(name, id);
> @@ -106,11 +104,8 @@ static struct platform_device
> *fsl_usb2_device_register( if (retval)
>  		goto error;
>  
> -	if (num) {
> -		retval = platform_device_add_resources(pdev, res, num);
> -		if (retval)
> -			goto error;
> -	}
> +	pdev->dev.of_node = ofdev->dev.of_node;
> +	pdev->dev.of_node_reused = true;
>  
>  	retval = platform_device_add(pdev);
>  	if (retval)