From: Suman Anna <s-anna@ti.com>
To: Ohad Ben-Cohen <ohad@wizery.com>,
Mark Rutland <mark.rutland@arm.com>,
Kumar Gala <galak@codeaurora.org>
Cc: Tony Lindgren <tony@atomide.com>,
Josh Cartwright <joshc@codeaurora.org>,
Bjorn Andersson <bjorn@kryo.se>, <linux-kernel@vger.kernel.org>,
<linux-omap@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
Suman Anna <s-anna@ti.com>
Subject: [PATCHv5 RFC 12/15] hwspinlock/core: add OF helper to parse reserved locks
Date: Wed, 30 Apr 2014 19:34:33 -0500 [thread overview]
Message-ID: <1398904476-26200-13-git-send-email-s-anna@ti.com> (raw)
In-Reply-To: <1398904476-26200-1-git-send-email-s-anna@ti.com>
The property 'hwlock-reserved-locks' will be used to represent
the number of locks to be reserved for clients that would need
to request/operate on specific locks. A new OF helper function,
of_hwspin_lock_get_num_reserved_locks(), is added to minimize
duplication in different platform implementations.
The function will return a value of 0 if the property is not
defined, so as to support a default behavior of marking all
locks as unused and open for anonymous allocations.
Signed-off-by: Suman Anna <s-anna@ti.com>
---
.../devicetree/bindings/hwlock/hwlock.txt | 3 +++
drivers/hwspinlock/hwspinlock_core.c | 25 ++++++++++++++++++++++
include/linux/hwspinlock.h | 1 +
3 files changed, 29 insertions(+)
diff --git a/Documentation/devicetree/bindings/hwlock/hwlock.txt b/Documentation/devicetree/bindings/hwlock/hwlock.txt
index d538a9b..88d16d2 100644
--- a/Documentation/devicetree/bindings/hwlock/hwlock.txt
+++ b/Documentation/devicetree/bindings/hwlock/hwlock.txt
@@ -18,6 +18,9 @@ Common properties:
property is needed on hwlock devices, where the number
of supported locks within a hwlock device cannot be
read from a register.
+- hwlock-reserved-locks: Number of locks to reserve for clients requiring
+ specific locks. This value cannot exceed the value of
+ hwlock-num-locks.
- hwlock-base-id: An unique base Id for the locks for a particular hwlock
device. This property is mandatory ONLY if a SoC has
several hwlock devices.
diff --git a/drivers/hwspinlock/hwspinlock_core.c b/drivers/hwspinlock/hwspinlock_core.c
index e05cea8..e74b55b 100644
--- a/drivers/hwspinlock/hwspinlock_core.c
+++ b/drivers/hwspinlock/hwspinlock_core.c
@@ -286,6 +286,31 @@ int of_hwspin_lock_get_base_id(struct device_node *dn)
EXPORT_SYMBOL_GPL(of_hwspin_lock_get_base_id);
/**
+ * of_hwspin_lock_get_num_reserved_locks() - retrieve number of reserved locks
+ * @dn: device node pointer
+ *
+ * This is an OF helper function that can be called by the underlying platform
+ * specific implementations, to retrieve the number of locks to reserve from
+ * the hwspinlock device instance's base id. The hwlock-reserved-locks DT
+ * property needs to be defined for requesting any DT-based locks.
+ *
+ * Returns a positive number of locks on success, a default value of 0 if the
+ * property is missing or an appropriate error code as returned by the OF layer
+ */
+int of_hwspin_lock_get_num_reserved_locks(struct device_node *dn)
+{
+ unsigned int val = 0;
+ int ret;
+
+ ret = of_property_read_u32(dn, "hwlock-reserved-locks", &val);
+ if (!ret || ret == -EINVAL)
+ ret = val;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(of_hwspin_lock_get_num_reserved_locks);
+
+/**
* of_hwspin_lock_get_num_locks() - OF helper to retrieve number of locks
* @dn: device node pointer
*
diff --git a/include/linux/hwspinlock.h b/include/linux/hwspinlock.h
index d120035..d18431f 100644
--- a/include/linux/hwspinlock.h
+++ b/include/linux/hwspinlock.h
@@ -69,6 +69,7 @@ int of_hwspin_lock_simple_xlate(struct hwspinlock_device *bank,
const struct of_phandle_args *hwlock_spec);
int of_hwspin_lock_get_base_id(struct device_node *dn);
int of_hwspin_lock_get_num_locks(struct device_node *dn);
+int of_hwspin_lock_get_num_reserved_locks(struct device_node *dn);
int hwspin_lock_register(struct hwspinlock_device *bank, struct device *dev,
const struct hwspinlock_ops *ops, int base_id, int num_locks,
int num_reserved_locks);
--
1.9.2
next prev parent reply other threads:[~2014-05-01 0:37 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-01 0:34 [PATCHv5 00/15] hwspinlock/omap dt support Suman Anna
2014-05-01 0:34 ` [PATCHv5 01/15] Documentation: dt: add common bindings for hwspinlock Suman Anna
2014-05-02 14:58 ` Rob Herring
2014-05-02 22:46 ` Suman Anna
2014-05-01 0:34 ` [PATCHv5 02/15] Documentation: dt: add the omap hwspinlock bindings document Suman Anna
2014-05-01 0:34 ` [PATCHv5 03/15] hwspinlock/core: maintain a list of registered hwspinlock banks Suman Anna
2014-07-01 12:26 ` Ohad Ben-Cohen
2014-07-02 21:14 ` Suman Anna
2014-07-03 7:00 ` Ohad Ben-Cohen
2014-07-03 17:28 ` Suman Anna
2014-07-04 5:01 ` Ohad Ben-Cohen
2014-07-08 15:22 ` Suman Anna
2014-05-01 0:34 ` [PATCHv5 04/15] hwspinlock/core: add common OF helpers Suman Anna
2014-07-01 12:45 ` Ohad Ben-Cohen
2014-07-02 21:14 ` Suman Anna
2014-07-03 7:15 ` Ohad Ben-Cohen
2014-07-03 17:35 ` Suman Anna
2014-07-04 4:58 ` Ohad Ben-Cohen
2014-07-08 15:37 ` Suman Anna
2014-05-01 0:34 ` [PATCHv5 05/15] hwspinlock/omap: add support for dt nodes Suman Anna
2014-07-01 12:48 ` Ohad Ben-Cohen
2014-07-02 19:42 ` Suman Anna
2014-07-03 7:25 ` Ohad Ben-Cohen
2014-05-01 0:34 ` [PATCHv5 06/15] hwspinlock/omap: enable module before reading SYSSTATUS register Suman Anna
2014-07-01 12:51 ` Ohad Ben-Cohen
2014-07-02 19:38 ` Suman Anna
2014-05-01 0:34 ` [PATCHv5 07/15] hwspinlock/omap: enable build for AM33xx, AM43xx & DRA7xx Suman Anna
2014-07-01 12:53 ` Ohad Ben-Cohen
2014-05-01 0:34 ` [PATCHv5 RFC 08/15] hwspinlock/core: add support for base id in DT Suman Anna
2014-05-05 20:37 ` Rob Herring
2014-05-05 21:37 ` Suman Anna
2014-05-01 0:34 ` [PATCHv5 RFC 09/15] hwspinlock/core: prepare unregister code to support reserved locks Suman Anna
2014-05-01 0:34 ` [PATCHv5 RFC 10/15] hwspinlock/core: prepare core " Suman Anna
2014-05-01 0:34 ` [PATCHv5 RFC 11/15] hwspinlock/core: add support for " Suman Anna
2014-05-01 0:34 ` Suman Anna [this message]
2014-05-05 21:44 ` [PATCHv5 RFC 12/15] hwspinlock/core: add OF helper to parse " Suman Anna
2014-05-05 21:54 ` Josh Cartwright
2014-05-10 1:17 ` Suman Anna
2014-05-01 0:34 ` [PATCHv5 RFC 13/15] hwspinlock/omap: use OF helper to get " Suman Anna
2014-05-01 0:34 ` [PATCHv5 RFC 14/15] hwspinlock/core: return ERR_PTRs on failure in _request_ api Suman Anna
2014-05-01 0:34 ` [PATCHv5 RFC 15/15] hwspinlock/core: change return codes of_hwspin_lock_request_specific Suman Anna
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