linux-kernel - [PATCH v6 5/9] regmap: Introduces regmap lock helpers

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Date:   Fri, 24 Dec 2021 11:13:48 +0700
From:   Quan Nguyen <quan@...amperecomputing.com>
To:     Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...id.au>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Jonathan Corbet <corbet@....net>, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-aspeed@...ts.ozlabs.org,
        openbmc@...ts.ozlabs.org, Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Arnd Bergmann <arnd@...db.de>,
        Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>
Cc:     Open Source Submission <patches@...erecomputing.com>,
        Phong Vo <phong@...amperecomputing.com>,
        "Thang Q . Nguyen" <thang@...amperecomputing.com>,
        Quan Nguyen <quan@...amperecomputing.com>
Subject: [PATCH v6 5/9] regmap: Introduces regmap lock helpers

This commit introduces regmap_acquire/release_lock() functions and makes
them available for drivers that need atomic access of regmap registers

Signed-off-by: Quan Nguyen <quan@...amperecomputing.com>
---
Change in v6:
  + First introduced in v6 [Quan]

 drivers/base/regmap/regmap.c | 12 ++++++++++++
 include/linux/regmap.h       |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 2d74f9f82aa9..36921309725b 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -87,6 +87,18 @@ bool regmap_check_range_table(struct regmap *map, unsigned int reg,
 }
 EXPORT_SYMBOL_GPL(regmap_check_range_table);
 
+void regmap_acquire_lock(struct regmap *map)
+{
+	map->lock(map->lock_arg);
+}
+EXPORT_SYMBOL_GPL(regmap_acquire_lock);
+
+void regmap_release_lock(struct regmap *map)
+{
+	map->unlock(map->lock_arg);
+}
+EXPORT_SYMBOL_GPL(regmap_release_lock);
+
 bool regmap_writeable(struct regmap *map, unsigned int reg)
 {
 	if (map->max_register && reg > map->max_register)
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 22652e5fbc38..0ed12e6ad4fb 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -1194,6 +1194,8 @@ int regmap_async_complete(struct regmap *map);
 bool regmap_can_raw_write(struct regmap *map);
 size_t regmap_get_raw_read_max(struct regmap *map);
 size_t regmap_get_raw_write_max(struct regmap *map);
+void regmap_acquire_lock(struct regmap *map);
+void regmap_release_lock(struct regmap *map);
 
 int regcache_sync(struct regmap *map);
 int regcache_sync_region(struct regmap *map, unsigned int min,
-- 
2.28.0