regmap-i2c: fix sparse warning in regmap_smbus_word_write_reg16

i2c_smbus_write_word_data() expects a plain u16, but cpu_to_le16()
returns __le16 (a sparse-restricted endian type). SMBus already
defines byte ordering internally, so replace cpu_to_le16() with a
plain (u16) cast.

Fixes: bad4bd28abf4 ("regmap-i2c: add SMBus byte/word reg16 bus for adapters lacking I2C_FUNC_I2C")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202605161621.mY5zFh4D-lkp@intel.com/
Signed-off-by: Nishanth Sampath Kumar <nissampa@cisco.com>

Author: nissampa

patches-sonic/0001-regmap-i2c-fix-sparse-warning-in-regmap_smbus_word_w.patch

@@ -0,0 +1,41 @@
+From c8cc0e330e797005e3870bb45d1c5d387e1a5b61 Mon Sep 17 00:00:00 2001
+From: Nishanth Sampath Kumar <nissampa@cisco.com>
+Date: Tue, 19 May 2026 09:41:53 -0700
+Subject: [PATCH] regmap-i2c: fix sparse warning in
+ regmap_smbus_word_write_reg16
+
+i2c_smbus_write_word_data() expects a plain u16, but cpu_to_le16()
+returns __le16 (a sparse-restricted endian type), causing:
+
+  drivers/base/regmap/regmap-i2c.c:340: sparse: incorrect type in
+  argument 3 (different base types)
+    expected unsigned short [usertype] value
+    got restricted __le16 [usertype]
+
+SMBus already defines byte ordering internally, so cpu_to_le16() is
+wrong here. Replace it with a plain (u16) cast.
+
+Fixes: bad4bd28abf4 ("regmap-i2c: add SMBus byte/word reg16 bus for adapters lacking I2C_FUNC_I2C")
+Reported-by: kernel test robot <lkp@intel.com>
+Closes: https://lore.kernel.org/oe-kbuild-all/202605161621.mY5zFh4D-lkp@intel.com/
+Signed-off-by: Nishanth Sampath Kumar <nissampa@cisco.com>
+---
+ drivers/base/regmap/regmap-i2c.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/base/regmap/regmap-i2c.c b/drivers/base/regmap/regmap-i2c.c
+index 31e30dfced19..ae441fc63127 100644
+--- a/drivers/base/regmap/regmap-i2c.c
++++ b/drivers/base/regmap/regmap-i2c.c
+@@ -337,7 +337,7 @@ static int regmap_smbus_word_write_reg16(void *context, const void *data,
+ 	val = ((u8 *)data)[2];
+ 
+ 	return i2c_smbus_write_word_data(i2c, addr_hi,
+-					 cpu_to_le16(((u16)val << 8) | addr_lo));
++					 ((u16)val << 8) | addr_lo));
+ }
+ 
+ static const struct regmap_bus regmap_smbus_byte_word_reg16 = {
+-- 
+2.25.1
+