From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: barebox@lists.infradead.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Subject: [PATCH 1/2] regmap: Add regmap_write_bits() function
Date: Mon, 14 Nov 2016 22:21:13 -0800 [thread overview]
Message-ID: <1479190874-10392-1-git-send-email-andrew.smirnov@gmail.com> (raw)
Add code implementing a simple version of regmap_write_bits().
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
drivers/base/regmap/regmap.c | 27 +++++++++++++++++++++++++++
include/regmap.h | 6 +++++-
2 files changed, 32 insertions(+), 1 deletion(-)
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index a042a1a..52b7d88 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -137,6 +137,33 @@ int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
}
/**
+ * regmap_write_bits - write bits of a register in a map
+ *
+ * @map: The map
+ * @reg: The register offset of the register
+ * @mask: Mask indicating bits to be modified
+ * (1 - modified, 0 - untouched)
+ * @val: Bit value to be set
+ *
+ * Returns 0 for success or negative error code on failure
+ */
+int regmap_write_bits(struct regmap *map, unsigned int reg,
+ unsigned int mask, unsigned int val)
+{
+ int ret;
+ unsigned int tmp, orig;
+
+ ret = regmap_read(map, reg, &orig);
+ if (ret != 0)
+ return ret;
+
+ tmp = orig & ~mask;
+ tmp |= val & mask;
+
+ return regmap_write(map, reg, tmp);
+}
+
+/**
* regmap_bulk_read(): Read data from the device
*
* @map: Register map to read from
diff --git a/include/regmap.h b/include/regmap.h
index bcbe6c1..9675a17 100644
--- a/include/regmap.h
+++ b/include/regmap.h
@@ -60,4 +60,8 @@ int regmap_get_val_bytes(struct regmap *map);
int regmap_get_max_register(struct regmap *map);
int regmap_get_reg_stride(struct regmap *map);
-#endif /* __REGMAP_H */
\ No newline at end of file
+int regmap_write_bits(struct regmap *map, unsigned int reg,
+ unsigned int mask, unsigned int val);
+
+
+#endif /* __REGMAP_H */
--
2.5.5
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next reply other threads:[~2016-11-15 6:22 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-15 6:21 Andrey Smirnov [this message]
2016-11-15 6:21 ` [PATCH 2/2] gpio: Port SX150x driver from Linux Andrey Smirnov
2016-11-17 6:41 ` [PATCH 1/2] regmap: Add regmap_write_bits() function Sascha Hauer
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