[PATCH 6/9] pci: rcar-gen2: enable clock

[Ulrich Hecht <ulrich.hecht@gmail.com>]

Makes the PCI host controllers come alive.

Signed-off-by: Ulrich Hecht <ulrich.hecht@gmail.com>
---
 drivers/pci/host/pci-rcar-gen2.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/pci/host/pci-rcar-gen2.c b/drivers/pci/host/pci-rcar-gen2.c
index cbaa5c4..568ff8e 100644
--- a/drivers/pci/host/pci-rcar-gen2.c
+++ b/drivers/pci/host/pci-rcar-gen2.c
@@ -9,6 +9,7 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
@@ -77,6 +78,7 @@
 #define RCAR_PCI_NR_CONTROLLERS		3
 
 struct rcar_pci_priv {
+	struct clk *clk;
 	void __iomem *reg;
 	struct resource io_res;
 	struct resource mem_res;
@@ -169,6 +171,9 @@ static int __init rcar_pci_setup(int nr, struct pci_sys_data *sys)
 	void __iomem *reg = priv->reg;
 	u32 val;
 
+	clk_prepare_enable(priv->clk);
+	udelay(4);
+
 	val = ioread32(reg + RCAR_PCI_UNIT_REV_REG);
 	pr_info("PCI: bus%u revision %x\n", sys->busnr, val);
 
@@ -273,6 +278,7 @@ static int __init rcar_pci_probe(struct platform_device *pdev)
 	struct resource *cfg_res, *mem_res;
 	struct rcar_pci_priv *priv;
 	void __iomem *reg;
+	struct clk *clk;
 
 	cfg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	reg = devm_ioremap_resource(&pdev->dev, cfg_res);
@@ -288,6 +294,12 @@ static int __init rcar_pci_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
+	clk = devm_clk_get(&pdev->dev, "usbpci");
+	if (IS_ERR(clk)) {
+		dev_err(&pdev->dev, "Can't get clock\n");
+		return PTR_ERR(clk);
+	}
+
 	priv->mem_res = *mem_res;
 	/*
 	 * The controller does not support/use port I/O,
@@ -302,6 +314,8 @@ static int __init rcar_pci_probe(struct platform_device *pdev)
 	priv->irq = platform_get_irq(pdev, 0);
 	priv->reg = reg;
 
+	priv->clk = clk;
+
 	return rcar_pci_add_controller(priv);
 }
 
-- 
1.8.4