linux-kernel - [PATCH] mfd: wm831x: Use maple tree register cache

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Date:   Tue, 25 Apr 2023 19:03:33 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Lee Jones <lee@...nel.org>
Cc:     patches@...nsource.cirrus.com, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH] mfd: wm831x: Use maple tree register cache

regmap has introduced a maple tree based register cache which makes use of
this more advanced data structure which has been added to the kernel
recently. Maple trees are much flatter than rbtrees, meaning that they do
not grow to such depths when the register map is sparse which makes access
a bit more efficient. The maple tree cache type is still a bit of a work
in progress but should be effective for some devices already.

The wm831x devices have a pretty sparse register map and being always on
devices never do cache syncs so don't hit the major current disadvantage
so they should be good candiates for using the maple tree cache.  Update
to do so, there should be little if any visible difference at runtime.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 drivers/mfd/wm831x-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/wm831x-core.c b/drivers/mfd/wm831x-core.c
index d2f444d2ae78..e86b6a4896a6 100644
--- a/drivers/mfd/wm831x-core.c
+++ b/drivers/mfd/wm831x-core.c
@@ -1430,7 +1430,7 @@ struct regmap_config wm831x_regmap_config = {
 	.reg_bits = 16,
 	.val_bits = 16,

-	.cache_type = REGCACHE_RBTREE,
+	.cache_type = REGCACHE_MAPLE,

 	.max_register = WM831X_DBE_CHECK_DATA,
 	.readable_reg = wm831x_reg_readable,

---
base-commit: 4a670ac3e75e517c96cbd01ef870dbd598c3ce71
change-id: 20230419-mfd-wm831x-maple-8da691bc3efc

Best regards,
-- 
Mark Brown <broonie@...nel.org>