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

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Date:	Tue, 6 May 2014 19:04:02 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <linux-pci@...r.kernel.org>
CC:	<rogerq@...com>, <balajitk@...com>,
	Kishon Vijay Abraham I <kishon@...com>,
	Dan Murphy <dmurphy@...com>
Subject: [TEMP PATCH 16/17] 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 |    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@...00000 {
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

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