linux-kernel - Re: [PATCH v2 2/4] of/pci: Add of_pci_get

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Message-Id: <20130213225950.155F93E3557@localhost>
Date:	Wed, 13 Feb 2013 22:59:50 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Thierry Reding <thierry.reding@...onic-design.de>
Cc:	Rob Herring <rob.herring@...xeda.com>,
	Andrew Murray <andrew.murray@....com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] of/pci: Add of_pci_get_devfn() function

On Mon, 11 Feb 2013 09:22:18 +0100, Thierry Reding <thierry.reding@...onic-design.de> wrote:
> This function can be used to parse the device and function number from a
> standard 5-cell PCI resource. PCI_SLOT() and PCI_FUNC() can be used on
> the returned value obtain the device and function numbers respectively.
> 
> Signed-off-by: Thierry Reding <thierry.reding@...onic-design.de>
> ---
> Changes in v2:
> - rename devfn and err variables for clarity
> 
>  drivers/of/of_pci.c    | 34 +++++++++++++++++++++++++++++-----
>  include/linux/of_pci.h |  1 +

There isn't a whole lot of value in this patch without another user.
I'll need to see the other patches that make use of this.

g.

>  2 files changed, 30 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
> index 13e37e2..4dd7b9b 100644
> --- a/drivers/of/of_pci.c
> +++ b/drivers/of/of_pci.c
> @@ -5,14 +5,15 @@
>  #include <asm/prom.h>
>  
>  static inline int __of_pci_pci_compare(struct device_node *node,
> -				       unsigned int devfn)
> +				       unsigned int data)
>  {
> -	unsigned int size;
> -	const __be32 *reg = of_get_property(node, "reg", &size);
> +	int devfn;
>  
> -	if (!reg || size < 5 * sizeof(__be32))
> +	devfn = of_pci_get_devfn(node);
> +	if (devfn < 0)
>  		return 0;
> -	return ((be32_to_cpup(&reg[0]) >> 8) & 0xff) == devfn;
> +
> +	return devfn == data;
>  }
>  
>  struct device_node *of_pci_find_child_device(struct device_node *parent,
> @@ -40,3 +41,26 @@ struct device_node *of_pci_find_child_device(struct device_node *parent,
>  	return NULL;
>  }
>  EXPORT_SYMBOL_GPL(of_pci_find_child_device);
> +
> +/**
> + * of_pci_get_devfn() - Get device and function numbers for a device node
> + * @np: device node
> + *
> + * Parses a standard 5-cell PCI resource and returns an 8-bit value that can
> + * be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device
> + * and function numbers respectively. On error a negative error code is
> + * returned.
> + */
> +int of_pci_get_devfn(struct device_node *np)
> +{
> +	unsigned int size;
> +	const __be32 *reg;
> +
> +	reg = of_get_property(np, "reg", &size);
> +
> +	if (!reg || size < 5 * sizeof(__be32))
> +		return -EINVAL;
> +
> +	return (be32_to_cpup(reg) >> 8) & 0xff;
> +}
> +EXPORT_SYMBOL_GPL(of_pci_get_devfn);
> diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
> index bb115de..91ec484 100644
> --- a/include/linux/of_pci.h
> +++ b/include/linux/of_pci.h
> @@ -10,5 +10,6 @@ int of_irq_map_pci(const struct pci_dev *pdev, struct of_irq *out_irq);
>  struct device_node;
>  struct device_node *of_pci_find_child_device(struct device_node *parent,
>  					     unsigned int devfn);
> +int of_pci_get_devfn(struct device_node *np);
>  
>  #endif
> -- 
> 1.8.1.2
> 

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
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