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Subject[RFC/RFT 4/6] 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.

Co-developed-by: Peter Geis <pgwipeout@gmail.com>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
---
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 863374604fb1..1b0c2115b32e 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"

@@ -59,6 +60,7 @@ struct rockchip_pcie {
struct regulator *vpcie3v3;
struct irq_domain *irq_domain;
raw_spinlock_t irq_lock;
+ bool bifurcation;
};

static int rockchip_pcie_readl_apb(struct rockchip_pcie *rockchip,
@@ -273,6 +275,12 @@ 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;
@@ -345,6 +353,9 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
}
}

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