Re: [PATCH 2/2] pci: fsl: rework PCI driver compatible with Layerscape

[Scott Wood <scottwood@freescale.com>]

On Wed, 2013-09-18 at 19:02 +0800, Minghuan Lian wrote:
> @@ -592,6 +719,7 @@ int fsl_pci_mcheck_exception(struct pt_regs *regs)
>  #if defined(CONFIG_FSL_SOC_BOOKE) || defined(CONFIG_PPC_86xx)
>  
>  struct device_node *fsl_pci_primary;
> +extern const struct of_device_id fsl_pci_ids[];

Externs go in headers.

> -static int fsl_pci_probe(struct platform_device *pdev)
> +static int __init fsl_pci_probe(struct platform_device *pdev)
>  {
>  	int ret;
> -	struct device_node *node;
> +	struct fsl_pci *pci;
> +
> +	if (!of_device_is_available(pdev->dev.of_node)) {
> +		dev_warn(&pdev->dev, "disabled\n");
> +		return -ENODEV;
> +	}

This should be dev_dbg().

> -#ifdef CONFIG_PM
> -static int fsl_pci_resume(struct device *dev)
> +static int __exit fsl_pci_remove(struct platform_device *pdev)

Why __exit?  What happens if someone unbinds the PCI controller via
sysfs?
 
> +/*
> + * Structure of a PCI controller (host bridge)
> + */
> +struct fsl_pci {
> +	struct list_head node;
> +	int is_pcie;

bool is_pcie;

> +/* Return link status 0-> link, 1-> no link */
> +int fsl_pci_check_link(struct fsl_pci *pci);

bool

> +
> +/*
> + * The fsl_arch_* functions are arch hooks. Those functions are
> + * implemented as weak symbols so that they can be overridden by
> + * architecture specific code if needed.
> + */
> +
> +/* Return PCI64 DMA offset */
> +u64 fsl_arch_pci64_dma_offset(void);

Is this always guaranteed to exist?

> +/* Register PCI/PCIe controller to architecture system */
> +int __weak fsl_arch_pci_sys_register(struct fsl_pci *pci);
> +
> +/* Remove PCI/PCIe controller from architecture system */
> +void __weak fsl_arch_pci_sys_remove(struct fsl_pci *pci);

Why do these need to be weak?  Won't there be exactly one implementation
per supported arch?

-Scott