linux-kernel - [PATCH v2 2/4] iio: light: veml6030: extend regmap to support caching

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Message-Id: <20250119-veml6030-scale-v2-2-6bfc4062a371@gmail.com>
Date: Sun, 19 Jan 2025 18:31:59 +0100
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Jonathan Cameron <jic23@...nel.org>, 
 Lars-Peter Clausen <lars@...afoo.de>, Rishi Gupta <gupt21@...il.com>, 
 Matti Vaittinen <mazziesaccount@...il.com>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH v2 2/4] iio: light: veml6030: extend regmap to support
 caching

The configuration registers are not volatile and are not affected
by read operations (i.e. not precious), making them suitable to be
cached in order to reduce the number of accesses to the device.

Add support for caching (RBTREE type).

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/iio/light/veml6030.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/iio/light/veml6030.c b/drivers/iio/light/veml6030.c
index 8e4eb8b0c19276635567d4eed74f4d402c3205fa..3afd4bb1ad53157f7ec63a35f51e5a96f7b019fd 100644
--- a/drivers/iio/light/veml6030.c
+++ b/drivers/iio/light/veml6030.c
@@ -333,12 +333,43 @@ static const struct iio_chan_spec veml7700_channels[] = {
 	IIO_CHAN_SOFT_TIMESTAMP(VEML6030_SCAN_TIMESTAMP),
 };
 
+static const struct regmap_range veml6030_readable_ranges[] = {
+	regmap_reg_range(VEML6030_REG_ALS_CONF, VEML6030_REG_ALS_INT),
+};
+
+static const struct regmap_access_table veml6030_readable_table = {
+	.yes_ranges = veml6030_readable_ranges,
+	.n_yes_ranges = ARRAY_SIZE(veml6030_readable_ranges),
+};
+
+static const struct regmap_range veml6030_writable_ranges[] = {
+	regmap_reg_range(VEML6030_REG_ALS_CONF, VEML6030_REG_ALS_PSM),
+};
+
+static const struct regmap_access_table veml6030_writable_table = {
+	.yes_ranges = veml6030_writable_ranges,
+	.n_yes_ranges = ARRAY_SIZE(veml6030_writable_ranges),
+};
+
+static const struct regmap_range veml6030_volatile_ranges[] = {
+	regmap_reg_range(VEML6030_REG_ALS_DATA, VEML6030_REG_WH_DATA),
+};
+
+static const struct regmap_access_table veml6030_volatile_table = {
+	.yes_ranges = veml6030_volatile_ranges,
+	.n_yes_ranges = ARRAY_SIZE(veml6030_volatile_ranges),
+};
+
 static const struct regmap_config veml6030_regmap_config = {
 	.name = "veml6030_regmap",
 	.reg_bits = 8,
 	.val_bits = 16,
 	.max_register = VEML6030_REG_ALS_INT,
 	.val_format_endian = REGMAP_ENDIAN_LITTLE,
+	.rd_table = &veml6030_readable_table,
+	.wr_table = &veml6030_writable_table,
+	.volatile_table = &veml6030_volatile_table,
+	.cache_type = REGCACHE_RBTREE,
 };
 
 static int veml6030_get_intgrn_tm(struct iio_dev *indio_dev,

-- 
2.43.0