[TEMP PATCH 16/17] pci: host: pcie-dra7xx: use reset framework APIs to reset PCIe

Kishon Vijay Abraham I
2014-05-06T13:34:02Z

Get reset nodes from dt and use reset framework APIs to reset PCIe.
This is needed since reset is handled by the SoC.

Cc: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
Documentation/devicetree/bindings/pci/ti-pci.txt | 2 ++
drivers/pci/host/pci-dra7xx.c | 10 ++++++++++
2 files changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/ti-pci.txt b/Documentation/devicetree/bindings/pci/ti-pci.txt
index 6cb6f09..cfb95c0 100644
--- a/Documentation/devicetree/bindings/pci/ti-pci.txt
+++ b/Documentation/devicetree/bindings/pci/ti-pci.txt
@@ -9,6 +9,8 @@ This node should have the properties described in "designware-pcie.txt".
- phys : the phandle for the PHY device (used by generic PHY framework)
- phy-names : the names of the PHY corresponding to the PHYs present in the
*phy* phandle.
+ - resets: phandle used if reset is handled be soc
+ - reset-names: name given to the phandle

Example:
pcie@51000000 {
diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
index a37c25c..17d64ee 100644
--- a/drivers/pci/host/pci-dra7xx.c
+++ b/drivers/pci/host/pci-dra7xx.c
@@ -20,6 +20,7 @@
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/resource.h>
+#include <linux/reset.h>
#include <linux/types.h>

#include "pcie-designware.h"
@@ -281,6 +282,7 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
struct resource *res;
struct dra7xx_pcie *dra7xx;
struct device *dev = &pdev->dev;
+ struct reset_control *rstc;

dra7xx = devm_kzalloc(&pdev->dev, sizeof(*dra7xx), GFP_KERNEL);
if (!dra7xx)
@@ -304,6 +306,14 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
if (!base)
return -ENOMEM;

+ rstc = devm_reset_control_get(dev, "reset");
+ if (IS_ERR(rstc))
+ return PTR_ERR(rstc);
+
+ ret = reset_control_deassert(rstc);
+ if (ret)
+ return ret;
+
phy = devm_phy_get(dev, "pcie-phy");
if (IS_ERR(phy))
return PTR_ERR(phy);
--
1.7.9.5