openwrt/target/linux/generic/backport-5.15/352-v6.3-regmap-apply-reg_base-and-reg_downshift-for-single-r.patch

From 697c3892d825fb78f42ec8e53bed065dd728db3e Mon Sep 17 00:00:00 2001
From: Daniel Golle <[email protected]>
Date: Mon, 30 Jan 2023 02:04:57 +0000
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
a regmap_bus or regmap_config which only offers single register
operations (ie. reg_read, reg_write and optionally reg_update_bits).

Fix that and take them into account also for regmap_bus with only
reg_read and read_write operations by applying reg_base and
reg_downshift in _regmap_bus_reg_write, _regmap_bus_reg_read.

Also apply reg_base and reg_downshift in _regmap_update_bits, but only
in case the operation is carried out with a reg_update_bits call
defined in either regmap_bus or regmap_config.

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 <[email protected]>
Tested-by: Colin Foster <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
---
 drivers/base/regmap/regmap.c | 6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1943,6 +1943,8 @@ static int _regmap_bus_reg_write(void *c
 {
 	struct regmap *map = context;
 
+	reg += map->reg_base;
+	reg >>= map->format.reg_downshift;
 	return map->bus->reg_write(map->bus_context, reg, val);
 }
 
@@ -2715,6 +2717,8 @@ static int _regmap_bus_reg_read(void *co
 {
 	struct regmap *map = context;
 
+	reg += map->reg_base;
+	reg >>= map->format.reg_downshift;
 	return map->bus->reg_read(map->bus_context, reg, val);
 }
 
@@ -3084,6 +3088,8 @@ static int _regmap_update_bits(struct re
 		*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;