linux-kernel - [TEMP PATCH v2 17/18] PCI: host: pcie-dra7xx: use reset framework APIs to reset PCIe

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Date:	Thu, 29 May 2014 12:08:19 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC:	<arnd@...db.de>, <tony@...mide.com>, <jg1.han@...sung.com>,
	<kishon@...com>, Dan Murphy <dmurphy@...com>
Subject: [TEMP PATCH v2 17/18] PCI: host: pcie-dra7xx: use reset framework APIs to reset PCIe

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@...com>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 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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