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@xxxxxx>
Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
---
Documentation/devicetree/bindings/pci/ti-pci.txt | 4 ++++
drivers/pci/host/pci-dra7xx.c | 10 ++++++++++
2 files changed, 14 insertions(+)
diff --git a/Documentation/devicetree/bindings/pci/ti-pci.txt b/Documentation/devicetree/bindings/pci/ti-pci.txt
index d07d2eb..3649c2e 100644
--- a/Documentation/devicetree/bindings/pci/ti-pci.txt
+++ b/Documentation/devicetree/bindings/pci/ti-pci.txt
@@ -22,6 +22,8 @@ PCIe Designware Controller
num-lanes,
interrupt-map-mask,
interrupt-map : as specified in ../designware-pcie.txt
+ - resets: phandle used if reset is handled be soc
+ - reset-names: name given to the phandle
Example:
axi {
@@ -45,6 +47,8 @@ axi {
ti,hwmods = "pcie1";
phys = <&pcie1_phy>;
phy-names = "pcie-phy0";
+ resets = <&prm_resets &device_reset>;
+ reset-names = "reset";
interrupt-map-mask = <0 0 0 7>;
interrupt-map = <0 0 0 1 &pcie_intc 1>,
<0 0 0 2 &pcie_intc 2>,
diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
index 8fb3a2e..17f5e6a 100644
--- a/drivers/pci/host/pci-dra7xx.c
+++ b/drivers/pci/host/pci-dra7xx.c
@@ -22,6 +22,7 @@
#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"
@@ -332,6 +333,7 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
char name[10];
+ struct reset_control *rstc;
dra7xx = devm_kzalloc(dev, sizeof(*dra7xx), GFP_KERNEL);
if (!dra7xx)
@@ -355,6 +357,14 @@ 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_count = of_property_count_strings(np, "phy-names");
if (phy_count < 0) {
dev_err(dev, "unable to find the strings\n");
--
1.7.9.5
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