[RFC PATCH v2 1/3] PCI: rockchip: Add support for pcie wake irq

[Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>]

Add support for PCIE_WAKE pin in rockchip pcie driver.

Signed-off-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
---

Changes in v2:
Use dev_pm_set_dedicated_wake_irq
        -- Suggested by Brian Norris <briannorris@xxxxxxxxxxxx>

 drivers/pci/host/pcie-rockchip.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
index 7bb9870f6d8c..c2b973c738fe 100644
--- a/drivers/pci/host/pcie-rockchip.c
+++ b/drivers/pci/host/pcie-rockchip.c
@@ -36,6 +36,7 @@
 #include <linux/pci_ids.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/reset.h>
 #include <linux/regmap.h>
 
@@ -853,7 +854,6 @@ static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc)
 	chained_irq_exit(chip, desc);
 }
 
-
 /**
  * rockchip_pcie_parse_dt - Parse Device Tree
  * @rockchip: PCIe port information
@@ -1018,6 +1018,14 @@ static int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
 		return err;
 	}
 
+	device_init_wakeup(dev, true);
+	irq = platform_get_irq_byname(pdev, "wake");
+	if (irq >= 0) {
+		err = dev_pm_set_dedicated_wake_irq(dev, irq);
+		if (err)
+			dev_err(dev, "failed to setup PCIe wake IRQ\n");
+	}
+
 	rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
 	if (IS_ERR(rockchip->vpcie3v3)) {
 		if (PTR_ERR(rockchip->vpcie3v3) == -EPROBE_DEFER)
@@ -1524,6 +1532,9 @@ static int rockchip_pcie_remove(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
 
+	dev_pm_clear_wake_irq(dev);
+	device_init_wakeup(dev, false);
+
 	pci_stop_root_bus(rockchip->root_bus);
 	pci_remove_root_bus(rockchip->root_bus);
 	pci_unmap_iospace(rockchip->io);
-- 
2.11.0