linux-kernel - [PATCH v4 2/5] iio: adc: ad7380: enable regmap cache

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Message-Id: <20250108-ad7380-add-alert-support-v4-2-1751802471ba@baylibre.com>
Date: Wed, 08 Jan 2025 13:49:34 +0100
From: Julien Stephan <jstephan@...libre.com>
To: Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 David Lechner <dlechner@...libre.com>, Jonathan Cameron <jic23@...nel.org>, 
 Jonathan Corbet <corbet@....net>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-doc@...r.kernel.org, Julien Stephan <jstephan@...libre.com>
Subject: [PATCH v4 2/5] iio: adc: ad7380: enable regmap cache

Enable regmap cache, to avoid useless access on spi bus.

Reviewed-by: David Lechner <dlechner@...libre.com>
Signed-off-by: Julien Stephan <jstephan@...libre.com>
---
 drivers/iio/adc/ad7380.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/iio/adc/ad7380.c b/drivers/iio/adc/ad7380.c
index bc7d58850a3e2a84a241d81377e3dc14c43fc101..b97d2978289e92ad502cd6a67de43d2b51cdab56 100644
--- a/drivers/iio/adc/ad7380.c
+++ b/drivers/iio/adc/ad7380.c
@@ -663,6 +663,20 @@ static int ad7380_regmap_reg_read(void *context, unsigned int reg,
 	return 0;
 }
 
+static const struct reg_default ad7380_reg_defaults[] = {
+	{ AD7380_REG_ADDR_ALERT_LOW_TH, 0x800 },
+	{ AD7380_REG_ADDR_ALERT_HIGH_TH, 0x7FF },
+};
+
+static const struct regmap_range ad7380_volatile_reg_ranges[] = {
+	regmap_reg_range(AD7380_REG_ADDR_CONFIG2, AD7380_REG_ADDR_ALERT),
+};
+
+static const struct regmap_access_table ad7380_volatile_regs = {
+	.yes_ranges = ad7380_volatile_reg_ranges,
+	.n_yes_ranges = ARRAY_SIZE(ad7380_volatile_reg_ranges),
+};
+
 static const struct regmap_config ad7380_regmap_config = {
 	.reg_bits = 3,
 	.val_bits = 12,
@@ -670,6 +684,10 @@ static const struct regmap_config ad7380_regmap_config = {
 	.reg_write = ad7380_regmap_reg_write,
 	.max_register = AD7380_REG_ADDR_ALERT_HIGH_TH,
 	.can_sleep = true,
+	.reg_defaults = ad7380_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(ad7380_reg_defaults),
+	.volatile_table = &ad7380_volatile_regs,
+	.cache_type = REGCACHE_MAPLE,
 };
 
 static int ad7380_debugfs_reg_access(struct iio_dev *indio_dev, u32 reg,

-- 
2.47.1