linux-kernel - [PATCH 1/2] regmap: add regmap_might

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Message-Id: <20221121150843.1562603-1-michael@walle.cc>
Date:   Mon, 21 Nov 2022 16:08:42 +0100
From:   Michael Walle <michael@...le.cc>
To:     Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>
Cc:     linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        William Breathitt Gray <william.gray@...aro.org>,
        Michael Walle <michael@...le.cc>
Subject: [PATCH 1/2] regmap: add regmap_might_sleep()

With the dawn of MMIO gpio-regmap users, it is desirable to let
gpio-regmap ask the regmap if it might sleep during an access so
it can pass that information to gpiochip. Add a new regmap_might_sleep()
to query the regmap.

Signed-off-by: Michael Walle <michael@...le.cc>
---
 drivers/base/regmap/regmap.c | 13 +++++++++++++
 include/linux/regmap.h       |  7 +++++++
 2 files changed, 20 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index c6d6d53e8cd3..d12d669157f2 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -3486,6 +3486,19 @@ int regmap_get_reg_stride(struct regmap *map)
 }
 EXPORT_SYMBOL_GPL(regmap_get_reg_stride);
 
+/**
+ * regmap_might_sleep() - Returns whether a regmap access might sleep.
+ *
+ * @map: Register map to operate on.
+ *
+ * Returns true if an access to the register might sleep, else false.
+ */
+bool regmap_might_sleep(struct regmap *map)
+{
+	return map->can_sleep;
+}
+EXPORT_SYMBOL_GPL(regmap_might_sleep);
+
 int regmap_parse_val(struct regmap *map, const void *buf,
 			unsigned int *val)
 {
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index ca3434dca3a0..3faf5d5dbb26 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -1219,6 +1219,7 @@ static inline int regmap_write_bits(struct regmap *map, unsigned int reg,
 int regmap_get_val_bytes(struct regmap *map);
 int regmap_get_max_register(struct regmap *map);
 int regmap_get_reg_stride(struct regmap *map);
+bool regmap_might_sleep(struct regmap *map);
 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);
@@ -1905,6 +1906,12 @@ static inline int regmap_get_reg_stride(struct regmap *map)
 	return -EINVAL;
 }
 
+static inline bool regmap_might_sleep(struct regmap *map)
+{
+	WARN_ONCE(1, "regmap API is disabled");
+	return true;
+}
+
 static inline int regcache_sync(struct regmap *map)
 {
 	WARN_ONCE(1, "regmap API is disabled");
-- 
2.30.2