linux-kernel - [PATCH] regmap: apply reg_base and reg

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Date:   Sat, 28 Jan 2023 03:10:01 +0000
From:   Daniel Golle <daniel@...rotopia.org>
To:     linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Colin Foster <colin.foster@...advantage.com>
Subject: [PATCH] regmap: apply reg_base and reg_downshift for single register
 ops

reg_base and reg_downshift currently don't have any effect if used with
simple single register operations.

Fix that by taking them into account also for _reg_read, _reg_write and
_reg_update_bits (they may still be missing also in other place, eg.
page selection code).

Fixes: 0074f3f2b1e43d ("regmap: allow a defined reg_base to be added to every address")
Fixes: 86fc59ef818beb ("regmap: add configurable downshift for addresses")
Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/base/regmap/regmap.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index d12d669157f24..7b8386ec21b8c 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1986,6 +1986,8 @@ int _regmap_write(struct regmap *map, unsigned int reg,
 		}
 	}
 
+	reg += map->reg_base;
+	reg >>= map->format.reg_downshift;
 	ret = map->reg_write(context, reg, val);
 	if (ret == 0) {
 		if (regmap_should_log(map))
@@ -2879,6 +2881,8 @@ static int _regmap_read(struct regmap *map, unsigned int reg,
 	if (!regmap_readable(map, reg))
 		return -EIO;
 
+	reg += map->reg_base;
+	reg >>= map->format.reg_downshift;
 	ret = map->reg_read(context, reg, val);
 	if (ret == 0) {
 		if (regmap_should_log(map))
@@ -3231,6 +3235,8 @@ static int _regmap_update_bits(struct regmap *map, unsigned int reg,
 		*change = false;
 
 	if (regmap_volatile(map, reg) && map->reg_update_bits) {
+		reg += map->reg_base;
+		reg >>= map->format.reg_downshift;
 		ret = map->reg_update_bits(map->bus_context, reg, mask, val);
 		if (ret == 0 && change)
 			*change = true;

base-commit: e2f86c02fdc96ca29ced53221a3cbf50aa6f8b49
-- 
2.39.1