From: Mark Brown <broonie@kernel.org>
Date: Fri, 24 Mar 2023 22:58:42 +0000 (+0000)
Subject: regmap: Support paging for buses with reg_read()/reg_write()
X-Git-Tag: v6.6.7~3025^2~9
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f18ee501e233a2b830a0c84a2e780ab02d946c04;p=platform%2Fkernel%2Flinux-starfive.git

regmap: Support paging for buses with reg_read()/reg_write()

We don't currently support paging for regmaps where the I/O happens through
bus provided reg_read() and reg_write() operatons, we simply ignore the
range since nothing is wired up properly. Wire things up.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230324-regmap-reg-read-write-page-v1-1-1fbc0dac67ae@kernel.org
---

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index a4e4367..473b65b 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1945,6 +1945,15 @@ static int _regmap_bus_reg_write(void *context, unsigned int reg,
 				 unsigned int val)
 {
 	struct regmap *map = context;
+	struct regmap_range_node *range;
+	int ret;
+
+	range = _regmap_range_lookup(map, reg);
+	if (range) {
+		ret = _regmap_select_page(map, &reg, range, 1);
+		if (ret != 0)
+			return ret;
+	}
 
 	reg = regmap_reg_addr(map, reg);
 	return map->bus->reg_write(map->bus_context, reg, val);
@@ -2842,6 +2851,15 @@ static int _regmap_bus_reg_read(void *context, unsigned int reg,
 				unsigned int *val)
 {
 	struct regmap *map = context;
+	struct regmap_range_node *range;
+	int ret;
+
+	range = _regmap_range_lookup(map, reg);
+	if (range) {
+		ret = _regmap_select_page(map, &reg, range, 1);
+		if (ret != 0)
+			return ret;
+	}
 
 	reg = regmap_reg_addr(map, reg);
 	return map->bus->reg_read(map->bus_context, reg, val);