Re: [PATCHv9 05/12] PCI: mobiveil: Add callback function for interrupt initialization

[Andrew Murray]

On Wed, Nov 20, 2019 at 03:45:50AM +0000, Z.q. Hou wrote:
> From: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> 
> The Mobiveil GPEX internal MSI/INTx controller may not be used
> by other platforms in which the Mobiveil GPEX is integrated.
> This patch is to allow these platforms to implement their
> specific interrupt initialization.
> 
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> ---
> V9:
>  - New patch splited from the #1 of V8 patches to make it easy to review.
> 
>  drivers/pci/controller/mobiveil/pcie-mobiveil-host.c | 3 +++
>  drivers/pci/controller/mobiveil/pcie-mobiveil.h      | 7 +++++++
>  2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> index 2cc424e78d33..3cd93df6fe6e 100644
> --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> @@ -507,6 +507,9 @@ static int mobiveil_pcie_interrupt_init(struct mobiveil_pcie *pcie)
>  	struct resource *res;
>  	int ret;
>  
> +	if (rp->ops->interrupt_init)
> +		return rp->ops->interrupt_init(pcie);
> +

This may be cleaner if you have a helper function named
"mobiveil_pcie_interrupt_init" where it either calls interrupt_init if present
or calls this current function renamed to "mobiveil_pcie_integrated_interrupt_init"
or similar.

A bit like the DWC dw_pcie_rd_own_conf function.

Thanks,

Andrew Murray

>  	/* map MSI config resource */
>  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "apb_csr");
>  	pcie->apb_csr_base = devm_pci_remap_cfg_resource(dev, res);
> diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.h b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> index e3148078e9dd..18d85806a7fc 100644
> --- a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> @@ -130,10 +130,17 @@ struct mobiveil_msi {			/* MSI information */
>  	DECLARE_BITMAP(msi_irq_in_use, PCI_NUM_MSI);
>  };
>  
> +struct mobiveil_pcie;
> +
> +struct mobiveil_rp_ops {
> +	int (*interrupt_init)(struct mobiveil_pcie *pcie);
> +};
> +
>  struct root_port {
>  	char root_bus_nr;
>  	void __iomem *config_axi_slave_base;	/* endpoint config base */
>  	struct resource *ob_io_res;
> +	struct mobiveil_rp_ops *ops;
>  	int irq;
>  	raw_spinlock_t intx_mask_lock;
>  	struct irq_domain *intx_domain;
> -- 
> 2.17.1
>