[U-Boot] [PATCH] core: ofnode: Add ofnode_pci_get_devfn()

[Simon Glass <sjg@chromium.org>]

Hi Stefan,

On Sat, 19 Jan 2019 at 00:46, Stefan Roese <sr@denx.de> wrote:
>
> This function will be used by the Marvell Armada XP/38x PCIe driver,
> which is moved to DM right now. It's mostly copied from the Linux
> version.
>
> Signed-off-by: Stefan Roese <sr@denx.de>
> Cc: Simon Glass <sjg@chromium.org>
> ---
>  drivers/core/ofnode.c | 12 ++++++++++++
>  include/dm/ofnode.h   | 11 +++++++++++
>  2 files changed, 23 insertions(+)

The code to do this right now is in pci_uclass_child_post_bind(). Do
you think you could break that out into a pci_... function that you
can call from your new function?

Also I had a look at the code you wrote that calls this. Ideally we
would have the PCIe nodes have their own driver so that driver model
will automatically bind them, but I am not sure that is feasible.

Regards,
Simon


>
> diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
> index 0e584c12dc..b74b95ff61 100644
> --- a/drivers/core/ofnode.c
> +++ b/drivers/core/ofnode.c
> @@ -666,6 +666,18 @@ int ofnode_read_pci_vendev(ofnode node, u16 *vendor, u16 *device)
>         return -ENOENT;
>  }
>
> +int ofnode_pci_get_devfn(ofnode node)
> +{
> +       u32 reg[5];
> +       int error;
> +
> +       error = ofnode_read_u32_array(node, "reg", reg, ARRAY_SIZE(reg));
> +       if (error)
> +               return error;
> +
> +       return (reg[0] >> 8) & 0xff;
> +}
> +
>  int ofnode_read_addr_cells(ofnode node)
>  {
>         if (ofnode_is_np(node))
> diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
> index d206ee2caa..66d7f8d055 100644
> --- a/include/dm/ofnode.h
> +++ b/include/dm/ofnode.h
> @@ -608,6 +608,17 @@ int ofnode_read_pci_addr(ofnode node, enum fdt_pci_space type,
>   */
>  int ofnode_read_pci_vendev(ofnode node, u16 *vendor, u16 *device);
>
> +/**
> + * ofnode_pci_get_devfn() - Get device and function numbers for a device node
> + * @ofnode: node to examine
> + *
> + * 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 ofnode_pci_get_devfn(ofnode node);
> +
>  /**
>   * ofnode_read_addr_cells() - Get the number of address cells for a node
>   *
> --
> 2.20.1
>