[v8,10/10] PCI: dwc: ep: Add Kernel-doc comments for APIs

All of the APIs are missing the Kernel-doc comments. Hence, add them.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-designware-ep.c | 92 +++++++++++++++++++++++++
 1 file changed, 92 insertions(+)

On Sat, Feb 24, 2024 at 12:24:16PM +0530, Manivannan Sadhasivam wrote:
> All of the APIs are missing the Kernel-doc comments. Hence, add them.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

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

> ---
>  drivers/pci/controller/dwc/pcie-designware-ep.c | 92 +++++++++++++++++++++++++
>  1 file changed, 92 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> index fed4c2936c78..cdcb33a279db 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -14,6 +14,11 @@
>  #include <linux/pci-epc.h>
>  #include <linux/pci-epf.h>
>  
> +/**
> + * dw_pcie_ep_init_notify - Notify EPF drivers about EPC initialization
> + *			    complete
> + * @ep: DWC EP device
> + */
>  void dw_pcie_ep_init_notify(struct dw_pcie_ep *ep)
>  {
>  	struct pci_epc *epc = ep->epc;
> @@ -22,6 +27,14 @@ void dw_pcie_ep_init_notify(struct dw_pcie_ep *ep)
>  }
>  EXPORT_SYMBOL_GPL(dw_pcie_ep_init_notify);
>  
> +/**
> + * dw_pcie_ep_get_func_from_ep - Get the struct dw_pcie_ep_func corresponding to
> + *				 the endpoint function
> + * @ep: DWC EP device
> + * @func_no: Function number of the endpoint device
> + *
> + * Return: struct dw_pcie_ep_func if success, NULL otherwise.
> + */
>  struct dw_pcie_ep_func *
>  dw_pcie_ep_get_func_from_ep(struct dw_pcie_ep *ep, u8 func_no)
>  {
> @@ -52,6 +65,11 @@ static void __dw_pcie_ep_reset_bar(struct dw_pcie *pci, u8 func_no,
>  	dw_pcie_dbi_ro_wr_dis(pci);
>  }
>  
> +/**
> + * dw_pcie_ep_reset_bar - Reset endpoint BAR
> + * @pci: DWC PCI device
> + * @bar: BAR number of the endpoint
> + */
>  void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
>  {
>  	u8 func_no, funcs;
> @@ -431,6 +449,13 @@ static const struct pci_epc_ops epc_ops = {
>  	.get_features		= dw_pcie_ep_get_features,
>  };
>  
> +/**
> + * dw_pcie_ep_raise_intx_irq - Raise INTx IRQ to the host
> + * @ep: DWC EP device
> + * @func_no: Function number of the endpoint
> + *
> + * Return: 0 if success, errono otherwise.
> + */
>  int dw_pcie_ep_raise_intx_irq(struct dw_pcie_ep *ep, u8 func_no)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> @@ -442,6 +467,14 @@ int dw_pcie_ep_raise_intx_irq(struct dw_pcie_ep *ep, u8 func_no)
>  }
>  EXPORT_SYMBOL_GPL(dw_pcie_ep_raise_intx_irq);
>  
> +/**
> + * dw_pcie_ep_raise_msi_irq - Raise MSI IRQ to the host
> + * @ep: DWC EP device
> + * @func_no: Function number of the endpoint
> + * @interrupt_num: Interrupt number to be raised
> + *
> + * Return: 0 if success, errono otherwise.
> + */
>  int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
>  			     u8 interrupt_num)
>  {
> @@ -490,6 +523,15 @@ int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
>  }
>  EXPORT_SYMBOL_GPL(dw_pcie_ep_raise_msi_irq);
>  
> +/**
> + * dw_pcie_ep_raise_msix_irq_doorbell - Raise MSIX to the host using Doorbell
> + *					method
> + * @ep: DWC EP device
> + * @func_no: Function number of the endpoint device
> + * @interrupt_num: Interrupt number to be raised
> + *
> + * Return: 0 if success, errno otherwise.
> + */
>  int dw_pcie_ep_raise_msix_irq_doorbell(struct dw_pcie_ep *ep, u8 func_no,
>  				       u16 interrupt_num)
>  {
> @@ -509,6 +551,14 @@ int dw_pcie_ep_raise_msix_irq_doorbell(struct dw_pcie_ep *ep, u8 func_no,
>  	return 0;
>  }
>  
> +/**
> + * dw_pcie_ep_raise_msix_irq - Raise MSIX to the host
> + * @ep: DWC EP device
> + * @func_no: Function number of the endpoint device
> + * @interrupt_num: Interrupt number to be raised
> + *
> + * Return: 0 if success, errno otherwise.
> + */
>  int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
>  			      u16 interrupt_num)
>  {
> @@ -556,6 +606,12 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
>  	return 0;
>  }
>  
> +/**
> + * dw_pcie_ep_cleanup - Cleanup DWC EP resources
> + * @ep: DWC EP device
> + *
> + * Cleans up the DWC EP specific resources like eDMA etc...
> + */
>  void dw_pcie_ep_cleanup(struct dw_pcie_ep *ep)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> @@ -564,6 +620,13 @@ void dw_pcie_ep_cleanup(struct dw_pcie_ep *ep)
>  }
>  EXPORT_SYMBOL_GPL(dw_pcie_ep_cleanup);
>  
> +/**
> + * dw_pcie_ep_deinit - Deinitialize the endpoint device
> + * @ep: DWC EP device
> + *
> + * Deinitialize the endpoint device. EPC device is not destroyed since that will
> + * taken care by Devres.
> + */
>  void dw_pcie_ep_deinit(struct dw_pcie_ep *ep)
>  {
>  	struct pci_epc *epc = ep->epc;
> @@ -635,6 +698,14 @@ static void dw_pcie_ep_init_non_sticky_registers(struct dw_pcie *pci)
>  	dw_pcie_dbi_ro_wr_dis(pci);
>  }
>  
> +/**
> + * dw_pcie_ep_init_registers - Initialize DWC EP specific registers
> + * @ep: DWC EP device
> + *
> + * Initialize the registers (CSRs) specific to DWC EP. This API should be called
> + * only when the endpoint receives an active refclk (either from host or
> + * generated locally).
> + */
>  int dw_pcie_ep_init_registers(struct dw_pcie_ep *ep)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> @@ -718,6 +789,10 @@ int dw_pcie_ep_init_registers(struct dw_pcie_ep *ep)
>  }
>  EXPORT_SYMBOL_GPL(dw_pcie_ep_init_registers);
>  
> +/**
> + * dw_pcie_ep_linkup - Notify EPF drivers about link up event
> + * @ep: DWC EP device
> + */
>  void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
>  {
>  	struct pci_epc *epc = ep->epc;
> @@ -726,6 +801,14 @@ void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
>  }
>  EXPORT_SYMBOL_GPL(dw_pcie_ep_linkup);
>  
> +/**
> + * dw_pcie_ep_linkdown - Notify EPF drivers about link down event
> + * @ep: DWC EP device
> + *
> + * Non-sticky registers are also initialized before sending the notification to
> + * the EPF drivers. This is needed since the registers need to be initialized
> + * before the link comes back again.
> + */
>  void dw_pcie_ep_linkdown(struct dw_pcie_ep *ep)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> @@ -743,6 +826,15 @@ 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)
>  {
>  	int ret;
> 
> -- 
> 2.25.1
>

On Thu, Feb 29, 2024 at 01:56:23PM +0100, Niklas Cassel wrote:
> Hello Mani,
> 
> On Sat, Feb 24, 2024 at 12:24:16PM +0530, Manivannan Sadhasivam wrote:
> > All of the APIs are missing the Kernel-doc comments. Hence, add them.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > ---
> >  drivers/pci/controller/dwc/pcie-designware-ep.c | 92 +++++++++++++++++++++++++
> >  1 file changed, 92 insertions(+)
> > 
> > diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> > index fed4c2936c78..cdcb33a279db 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> 
> (snip)
> 
> > @@ -556,6 +606,12 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
> >  	return 0;
> >  }
> >  
> > +/**
> > + * dw_pcie_ep_cleanup - Cleanup DWC EP resources
> > + * @ep: DWC EP device
> > + *
> > + * Cleans up the DWC EP specific resources like eDMA etc...
> 
> I think that you should mention that this is only for glue drivers that
> use PERST# handling, so that other glue drivers do no start using it :)
> 

You are right. Will add the wording.

- Mani