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

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On 11/20/2013 09:38 PM, Ulrich Hecht wrote:
Makes the PCI host controllers come alive.


This is not needed if you use CCLKDEV_DEV_ID in patch 7/9

Thanks,
Val.

Signed-off-by: Ulrich Hecht <ulrich.hecht@xxxxxxxxx>
---
  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);
  }



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