Re: [PATCH 2/5] PCI: iproc: Add PAXC interface support

Florian Fainelli
2015-11-18T00:35:38Z

On 17/11/15 16:31, Ray Jui wrote:
> Traditionally, all iProc PCIe root complexes use PAXB based wrapper,
> with an integrated on-chip Serdes to support external endpoint devices.
> On newer iProc platforms, a PAXC based wrapper is introduced, for
> connection with internally emulated PCIe endpoint devices in the ASIC
>
> This patch adds support for PAXC based iProc PCIe root complex in the
> iProc PCIe core driver. This change fators out common logic between
> PAXB and PAXC, and use tables to store register offsets that are
> different between PAXB and PAXC. This allows the driver to be scaled to
> support subsequent PAXC revisions in the future
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
> drivers/pci/host/pcie-iproc-platform.c | 8 ++
> drivers/pci/host/pcie-iproc.c | 202 +++++++++++++++++++++++++++------
> drivers/pci/host/pcie-iproc.h | 19 ++++
> 3 files changed, 195 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/pci/host/pcie-iproc-platform.c b/drivers/pci/host/pcie-iproc-platform.c
> index c9550dc..716b56b 100644
> --- a/drivers/pci/host/pcie-iproc-platform.c
> +++ b/drivers/pci/host/pcie-iproc-platform.c
> @@ -42,6 +42,13 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
> pcie->dev = &pdev->dev;
> platform_set_drvdata(pdev, pcie);
>
> + if (of_device_is_compatible(np, "brcm,iproc-pcie"))
> + pcie->type = IPROC_PCIE_PAXB;
> + else if (of_device_is_compatible(np, "brcm,iproc-pcie-paxc"))
> + pcie->type = IPROC_PCIE_PAXC;
> + else
> + return -ENODEV;

Sorry for not noticing earlier, but typically, to avoid repeating the
same compatible string twice (once if of_device_id, and somewhere else),
you would put the type in the .data member of the of_device_id lookup
table and you could fetch this directly here. So something like this:

static const struct of_device_id iproc_pcie_of_match_table[] = {
{ .compatible = "brcm,iproc-pcie", .data = (int *)IPROC_PCIE_PAXB },
+ { .compatible = "brcm,iproc-pcie-paxc", .data = (int *)IPROC_PCIE_PAXC },
{ /* sentinel */ }
--
Florian