LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
* [PATCH] regulator: sy8827n: Enable REGCACHE_FLAT
@ 2021-08-03  8:52 Jisheng Zhang
  2021-08-03 22:35 ` Mark Brown
  0 siblings, 1 reply; 2+ messages in thread
From: Jisheng Zhang @ 2021-08-03  8:52 UTC (permalink / raw)
  To: Liam Girdwood, Mark Brown; +Cc: linux-kernel

Enable regmap cache to reduce i2c transactions and corresponding
interrupts if regulator is accessed frequently. Since the register map
is small, we use a FLAT regmap cache.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
---
 drivers/regulator/sy8827n.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/regulator/sy8827n.c b/drivers/regulator/sy8827n.c
index 52e8c17afe24..7d5d9f879ce3 100644
--- a/drivers/regulator/sy8827n.c
+++ b/drivers/regulator/sy8827n.c
@@ -19,6 +19,10 @@
 #define   SY8827N_MODE		(1 << 6)
 #define SY8827N_VSEL1		1
 #define SY8827N_CTRL		2
+#define SY8827N_ID1		3
+#define SY8827N_ID2		4
+#define SY8827N_PGOOD		5
+#define SY8827N_MAX		(SY8827N_PGOOD + 1)
 
 #define SY8827N_NVOLTAGES	64
 #define SY8827N_VSELMIN		600000
@@ -102,9 +106,19 @@ static int sy8827n_regulator_register(struct sy8827n_device_info *di,
 	return PTR_ERR_OR_ZERO(rdev);
 }
 
+static bool sy8827n_volatile_reg(struct device *dev, unsigned int reg)
+{
+	if (reg == SY8827N_PGOOD)
+		return true;
+	return false;
+}
+
 static const struct regmap_config sy8827n_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
+	.volatile_reg = sy8827n_volatile_reg,
+	.num_reg_defaults_raw = SY8827N_MAX,
+	.cache_type = REGCACHE_FLAT,
 };
 
 static int sy8827n_i2c_probe(struct i2c_client *client)
-- 
2.32.0


^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, other threads:[~2021-08-03 22:36 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-03  8:52 [PATCH] regulator: sy8827n: Enable REGCACHE_FLAT Jisheng Zhang
2021-08-03 22:35 ` Mark Brown

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).