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Date: Tue, 3 Sep 2013 12:52:47 -0500
From: Suman Anna <s-anna@...com>
To: Ohad Ben-Cohen <ohad@...ery.com>
CC: Tony Lindgren <tony@...mide.com>,
Benoit Cousson <bcousson@...libre.com>,
Kumar Gala <galak@...eaurora.org>,
<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
<devicetree@...r.kernel.org>, Suman Anna <s-anna@...com>
Subject: [PATCH 1/2] hwspinlock/omap: add support for dt nodes
HwSpinlock IP is present only on OMAP4 and other newer SoCs,
which are all device-tree boot only. This patch adds the
base support for parsing the DT nodes, and removes the code
dealing with the traditional platform device instantiation.
Signed-off-by: Suman Anna <s-anna@...com>
---
.../devicetree/bindings/hwlock/omap-hwspinlock.txt | 28 ++++++++++
arch/arm/mach-omap2/Makefile | 3 --
arch/arm/mach-omap2/hwspinlock.c | 60 ----------------------
drivers/hwspinlock/omap_hwspinlock.c | 21 ++++++--
4 files changed, 45 insertions(+), 67 deletions(-)
create mode 100644 Documentation/devicetree/bindings/hwlock/omap-hwspinlock.txt
delete mode 100644 arch/arm/mach-omap2/hwspinlock.c
diff --git a/Documentation/devicetree/bindings/hwlock/omap-hwspinlock.txt b/Documentation/devicetree/bindings/hwlock/omap-hwspinlock.txt
new file mode 100644
index 0000000..adfb8ad
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwlock/omap-hwspinlock.txt
@@ -0,0 +1,28 @@
+OMAP4+ HwSpinlock Driver
+
+Required properties:
+- compatible: Currently supports only "ti,omap4-hwspinlock" for
+ OMAP44xx, OMAP54xx, AM33xx, AM43xx, DRA7xx SoCs
+- reg: Contains the hwspinlock register address range (base
+ address and length)
+- ti,hwmods: Name of the hwmod associated with the hwspinlock device
+
+Optional properties:
+- base_id: Base Id for the locks for a particular hwspinlock
+ device. If not mentioned, a default value of 0 is used.
+ This property is mandatory ONLY if a SoC has several
+ hwspinlock devices. There are currently no such OMAP
+ SoCs.
+
+ See documentation on struct hwspinlock_pdata in
+ linux/hwspinlock.h for more details.
+
+
+Example:
+
+/* OMAP4 */
+hwspinlock: spinlock@...f6000 {
+ compatible = "ti,omap4-hwspinlock";
+ reg = <0x4a0f6000 0x1000>;
+ ti,hwmods = "spinlock";
+};
diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index d4f6715..a17b5b8 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -288,9 +288,6 @@ obj-y += $(smc91x-m) $(smc91x-y)
smsc911x-$(CONFIG_SMSC911X) := gpmc-smsc911x.o
obj-y += $(smsc911x-m) $(smsc911x-y)
-ifneq ($(CONFIG_HWSPINLOCK_OMAP),)
-obj-y += hwspinlock.o
-endif
emac-$(CONFIG_TI_DAVINCI_EMAC) := am35xx-emac.o
obj-y += $(emac-m) $(emac-y)
diff --git a/arch/arm/mach-omap2/hwspinlock.c b/arch/arm/mach-omap2/hwspinlock.c
deleted file mode 100644
index ef175ac..0000000
--- a/arch/arm/mach-omap2/hwspinlock.c
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * OMAP hardware spinlock device initialization
- *
- * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
- *
- * Contact: Simon Que <sque@...com>
- * Hari Kanigeri <h-kanigeri2@...com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/err.h>
-#include <linux/hwspinlock.h>
-
-#include "soc.h"
-#include "omap_hwmod.h"
-#include "omap_device.h"
-
-static struct hwspinlock_pdata omap_hwspinlock_pdata __initdata = {
- .base_id = 0,
-};
-
-static int __init hwspinlocks_init(void)
-{
- int retval = 0;
- struct omap_hwmod *oh;
- struct platform_device *pdev;
- const char *oh_name = "spinlock";
- const char *dev_name = "omap_hwspinlock";
-
- /*
- * Hwmod lookup will fail in case our platform doesn't support the
- * hardware spinlock module, so it is safe to run this initcall
- * on all omaps
- */
- oh = omap_hwmod_lookup(oh_name);
- if (oh == NULL)
- return -EINVAL;
-
- pdev = omap_device_build(dev_name, 0, oh, &omap_hwspinlock_pdata,
- sizeof(struct hwspinlock_pdata));
- if (IS_ERR(pdev)) {
- pr_err("Can't build omap_device for %s:%s\n", dev_name,
- oh_name);
- retval = PTR_ERR(pdev);
- }
-
- return retval;
-}
-/* early board code might need to reserve specific hwspinlock instances */
-omap_postcore_initcall(hwspinlocks_init);
diff --git a/drivers/hwspinlock/omap_hwspinlock.c b/drivers/hwspinlock/omap_hwspinlock.c
index 292869c..d928235 100644
--- a/drivers/hwspinlock/omap_hwspinlock.c
+++ b/drivers/hwspinlock/omap_hwspinlock.c
@@ -1,7 +1,7 @@
/*
* OMAP hardware spinlock driver
*
- * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
+ * Copyright (C) 2010-2013 Texas Instruments Incorporated - http://www.ti.com
*
* Contact: Simon Que <sque@...com>
* Hari Kanigeri <h-kanigeri2@...com>
@@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/hwspinlock.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include "hwspinlock_internal.h"
@@ -80,14 +81,19 @@ static const struct hwspinlock_ops omap_hwspinlock_ops = {
static int omap_hwspinlock_probe(struct platform_device *pdev)
{
- struct hwspinlock_pdata *pdata = pdev->dev.platform_data;
+ struct device_node *node = pdev->dev.of_node;
struct hwspinlock_device *bank;
struct hwspinlock *hwlock;
struct resource *res;
void __iomem *io_base;
int num_locks, i, ret;
+ int base_id = 0;
- if (!pdata)
+ if (!node)
+ return -ENODEV;
+
+ ret = of_property_read_u32(node, "base_id", &base_id);
+ if (ret && ret != -EINVAL)
return -ENODEV;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -128,7 +134,7 @@ static int omap_hwspinlock_probe(struct platform_device *pdev)
pm_runtime_enable(&pdev->dev);
ret = hwspin_lock_register(bank, &pdev->dev, &omap_hwspinlock_ops,
- pdata->base_id, num_locks);
+ base_id, num_locks);
if (ret)
goto reg_fail;
@@ -161,12 +167,19 @@ static int omap_hwspinlock_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id omap_hwspinlock_of_match[] = {
+ { .compatible = "ti,omap4-hwspinlock", },
+ { /* end */ },
+};
+MODULE_DEVICE_TABLE(of, omap_hwspinlock_of_match);
+
static struct platform_driver omap_hwspinlock_driver = {
.probe = omap_hwspinlock_probe,
.remove = omap_hwspinlock_remove,
.driver = {
.name = "omap_hwspinlock",
.owner = THIS_MODULE,
+ .of_match_table = omap_hwspinlock_of_match,
},
};
--
1.8.3.3
--
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