regcache: Demote defaults readback from HW to debug print

Since commit 632e047 ("clk: rs9: Fix suspend/resume"), the
clk-renesas-pcie-9series driver produces the following print in
kernel log on boot:
"
clk-renesas-pcie-9series 8-0068: No cache defaults, reading back from HW
"
This is caused by the presence of .num_reg_defaults_raw in its struct
regmap_config, without a matching .reg_defaults_raw table of built-in
register default values.

This configuration is valid, and causes the regcache code to read the
default register settings from the hardware, which is a valid behavior
for this particular chip. In fact, this configuration is more common
than configuration with .reg_defaults_raw built-in register defaults.

Do not warn about the read of default values being read from hardware,
as that is too strong and seems unnecessary, turn the warning into a
debug print.

Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Link: https://patch.msgid.link/20260121234309.178391-1-marek.vasut+renesas@mailbox.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Marek Vasut

drivers/base/regmap/regcache.c

@@ -73,7 +73,7 @@ static int regcache_hw_init(struct regmap *map)
 
 	if (!map->reg_defaults_raw) {
 		bool cache_bypass = map->cache_bypass;
-		dev_warn(map->dev, "No cache defaults, reading back from HW\n");
+		dev_dbg(map->dev, "No cache defaults, reading back from HW\n");
 
 		/* Bypass the cache access till data read from HW */
 		map->cache_bypass = true;