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    Subject[RFC/RFT v2 06/11] PCI: rockchip-dwc: add PCIe bifurcation
    Date
    From: Frank Wunderlich <frank-w@public-files.de>

    PCIe Lanes can be split to 2 slots with bifurcation.
    Add support for this in existing PCIe driver that can be enabled
    by new "bifurcation" devicetree property.

    Co-developed-by: Peter Geis <pgwipeout@gmail.com>
    Signed-off-by: Frank Wunderlich <frank-w@public-files.de>

    ---
    changes in v2:
    - change rockchip,bifurcation to vendor unspecific bifurcation
    ---
    drivers/pci/controller/dwc/pcie-dw-rockchip.c | 11 +++++++++++
    1 file changed, 11 insertions(+)

    diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
    index b00832d653ea..79e909df241c 100644
    --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
    +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
    @@ -20,6 +20,7 @@
    #include <linux/platform_device.h>
    #include <linux/regmap.h>
    #include <linux/reset.h>
    +#include <linux/phy/pcie.h>

    #include "pcie-designware.h"

    @@ -58,6 +59,7 @@ struct rockchip_pcie {
    struct gpio_desc *rst_gpio;
    struct regulator *vpcie3v3;
    struct irq_domain *irq_domain;
    + bool bifurcation;
    };

    static int rockchip_pcie_readl_apb(struct rockchip_pcie *rockchip,
    @@ -259,6 +261,12 @@ static int rockchip_pcie_phy_init(struct rockchip_pcie *rockchip)
    return dev_err_probe(dev, PTR_ERR(rockchip->phy),
    "missing PHY\n");

    + if (rockchip->bifurcation) {
    + ret = phy_set_mode_ext(rockchip->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_BIFURCATION);
    + if (ret)
    + return ret;
    + }
    +
    ret = phy_init(rockchip->phy);
    if (ret < 0)
    return ret;
    @@ -319,6 +327,9 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
    }
    }

    + if (device_property_read_bool(dev, "bifurcation"))
    + rockchip->bifurcation = true;
    +
    ret = rockchip_pcie_phy_init(rockchip);
    if (ret)
    goto disable_regulator;
    --
    2.25.1
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