linux-kernel - [PATCH 2/3] regcache: Introduce the index parsing API

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Message-Id: <1450341930-5090-3-git-send-email-lixiubo@cmss.chinamobile.com>
Date:	Thu, 17 Dec 2015 16:45:29 +0800
From:	Xiubo Li <lixiubo@...s.chinamobile.com>
To:	broonie@...nel.org
Cc:	linux-kernel@...r.kernel.org,
	Xiubo Li <lixiubo@...s.chinamobile.com>
Subject: [PATCH 2/3] regcache: Introduce the index parsing API

Here introduces regcache_get_index() for regmap cache, which uses
the register stride order and bit rotation.

Signed-off-by: Xiubo Li <lixiubo@...s.chinamobile.com>
---
 drivers/base/regmap/internal.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index d43784e..60699e6 100644
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -270,4 +270,10 @@ static inline unsigned int regmap_get_offset(const struct regmap *map,
 	return index << map->reg_stride_order;
 }
 
+static inline unsigned int regcache_get_index(const struct regmap *map,
+					    unsigned int reg)
+{
+	return reg >> map->reg_stride_order;
+}
+
 #endif
-- 
1.8.3.1



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