Re: [PATCH v12 09/13] PCI: dwc: ep: Consolidate devicetree handling in dw_pcie_ep_get_resources()

Frank Li
2025-03-16T01:29:02Z

On Sat, Mar 15, 2025 at 03:15:44PM -0500, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@google.com>
>
> Consolidate devicetree resource handling in dw_pcie_ep_get_resources().
> No functional change intended.
>
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> ---

Reviewed-by: Frank Li <Frank.Li@nxp.com>

> .../pci/controller/dwc/pcie-designware-ep.c | 68 +++++++++++--------
> 1 file changed, 41 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> index 100d26466f05..2db834345ec2 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -883,35 +883,15 @@ void dw_pcie_ep_linkdown(struct dw_pcie_ep *ep)
> }
> EXPORT_SYMBOL_GPL(dw_pcie_ep_linkdown);
>
> -/**
> - * dw_pcie_ep_init - Initialize the endpoint device
> - * @ep: DWC EP device
> - *
> - * Initialize the endpoint device. Allocate resources and create the EPC
> - * device with the endpoint framework.
> - *
> - * Return: 0 if success, errno otherwise.
> - */
> -int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> +static int dw_pcie_ep_get_resources(struct dw_pcie_ep *ep)
> {
> - int ret;
> - struct resource *res;
> - struct pci_epc *epc;
> struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> struct device *dev = pci->dev;
> struct platform_device *pdev = to_platform_device(dev);
> struct device_node *np = dev->of_node;
> -
> - INIT_LIST_HEAD(&ep->func_list);
> -
> - epc = devm_pci_epc_create(dev, &epc_ops);
> - if (IS_ERR(epc)) {
> - dev_err(dev, "Failed to create epc device\n");
> - return PTR_ERR(epc);
> - }
> -
> - ep->epc = epc;
> - epc_set_drvdata(epc, ep);
> + struct pci_epc *epc = ep->epc;
> + struct resource *res;
> + int ret;
>
> ret = dw_pcie_get_resources(pci);
> if (ret)
> @@ -924,13 +904,47 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> ep->phys_base = res->start;
> ep->addr_size = resource_size(res);
>
> - if (ep->ops->pre_init)
> - ep->ops->pre_init(ep);
> -
> ret = of_property_read_u8(np, "max-functions", &epc->max_functions);
> if (ret < 0)
> epc->max_functions = 1;
>
> + return 0;
> +}
> +
> +/**
> + * dw_pcie_ep_init - Initialize the endpoint device
> + * @ep: DWC EP device
> + *
> + * Initialize the endpoint device. Allocate resources and create the EPC
> + * device with the endpoint framework.
> + *
> + * Return: 0 if success, errno otherwise.
> + */
> +int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> +{
> + int ret;
> + struct pci_epc *epc;
> + struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> + struct device *dev = pci->dev;
> +
> + INIT_LIST_HEAD(&ep->func_list);
> +
> + epc = devm_pci_epc_create(dev, &epc_ops);
> + if (IS_ERR(epc)) {
> + dev_err(dev, "Failed to create epc device\n");
> + return PTR_ERR(epc);
> + }
> +
> + ep->epc = epc;
> + epc_set_drvdata(epc, ep);
> +
> + ret = dw_pcie_ep_get_resources(ep);
> + if (ret)
> + return ret;
> +
> + if (ep->ops->pre_init)
> + ep->ops->pre_init(ep);
> +
> ret = pci_epc_mem_init(epc, ep->phys_base, ep->addr_size,
> ep->page_size);
> if (ret < 0) {
> --
> 2.34.1
>