linux-kernel - [PATCH 1/2] regmap: provide helpers for simple bit operations

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Date:   Thu, 28 May 2020 14:34:58 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Fabien Parent <fparent@...libre.com>,
        Stephane Le Provost <stephane.leprovost@...iatek.com>,
        Pedro Tsai <pedro.tsai@...iatek.com>,
        Andrew Perepech <andrew.perepech@...iatek.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 1/2] regmap: provide helpers for simple bit operations

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

In many instances regmap_update_bits() is used for simple bit setting
and clearing. In these cases the last argument is redundant and we can
hide it with a macro.

This adds three new macros for simple bit operations: set_bits,
clear_bits and test_bits.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 include/linux/regmap.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 40b07168fd8e..6ef829169f36 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -71,6 +71,24 @@ struct reg_sequence {
 	unsigned int delay_us;
 };
 
+#define regmap_set_bits(map, reg, bits) \
+	regmap_update_bits_base(map, reg, bits, bits, NULL, false, false)
+#define regmap_clear_bits(map, reg, bits) \
+	regmap_update_bits_base(map, reg, bits, 0, NULL, false, false)
+/*
+ * Returns -1 if the underlying regmap_read() fails, 0 if at least one of the
+ * tested bits is not set and 1 if all tested bits are set.
+ */
+#define regmap_test_bits(map, reg, bits) \
+({ \
+	unsigned int __val, __ret, __bits; \
+	__bits = (bits); \
+	__ret = regmap_read(map, reg, &__val); \
+	if (__ret == 0) \
+		__ret = (__val & __bits) == __bits ? 1 : 0; \
+	__ret; \
+})
+
 #define	regmap_update_bits(map, reg, mask, val) \
 	regmap_update_bits_base(map, reg, mask, val, NULL, false, false)
 #define	regmap_update_bits_async(map, reg, mask, val)\
-- 
2.25.0