regmap: debugfs: Add support for dumping write only device registers
Add support for dumping write only device registers in debugfs. This is
useful for audio codecs that have write only registers (like WM8731).
The logic that decides if a value can be printed is moved to
regmap_printable() function to allow for easier future updates.
Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 1ee3d40..36ce351 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -77,6 +77,17 @@
}
}
+static bool regmap_printable(struct regmap *map, unsigned int reg)
+{
+ if (regmap_precious(map, reg))
+ return false;
+
+ if (!regmap_readable(map, reg) && !regmap_cached(map, reg))
+ return false;
+
+ return true;
+}
+
/*
* Work out where the start offset maps into register numbers, bearing
* in mind that we suppress hidden registers.
@@ -105,8 +116,7 @@
if (list_empty(&map->debugfs_off_cache)) {
for (; i <= map->max_register; i += map->reg_stride) {
/* Skip unprinted registers, closing off cache entry */
- if (!regmap_readable(map, i) ||
- regmap_precious(map, i)) {
+ if (!regmap_printable(map, i)) {
if (c) {
c->max = p - 1;
c->max_reg = i - map->reg_stride;
@@ -204,7 +214,7 @@
start_reg = regmap_debugfs_get_dump_start(map, from, *ppos, &p);
for (i = start_reg; i <= to; i += map->reg_stride) {
- if (!regmap_readable(map, i))
+ if (!regmap_readable(map, i) && !regmap_cached(map, i))
continue;
if (regmap_precious(map, i))