[PATCH v5 1/8] iio: accel: adxl313: make use of regmap cache

[Lothar Rubusch <l.rubusch@gmail.com>]

Setup regmap cache to cache register configuration, reducing bus traffic
for repeated accesses to non volatile registers.

Signed-off-by: Lothar Rubusch <l.rubusch@gmail.com>
---
 drivers/iio/accel/adxl313.h      |  3 +++
 drivers/iio/accel/adxl313_core.c | 18 ++++++++++++++++++
 drivers/iio/accel/adxl313_i2c.c  |  6 ++++++
 drivers/iio/accel/adxl313_spi.c  |  6 ++++++
 4 files changed, 33 insertions(+)

diff --git a/drivers/iio/accel/adxl313.h b/drivers/iio/accel/adxl313.h
index 72f624af4686..2bc86ac8ffd4 100644
--- a/drivers/iio/accel/adxl313.h
+++ b/drivers/iio/accel/adxl313.h
@@ -22,6 +22,7 @@
 #define ADXL313_REG_BW_RATE		0x2C
 #define ADXL313_REG_POWER_CTL		0x2D
 #define ADXL313_REG_INT_MAP		0x2F
+#define ADXL313_REG_INT_SOURCE		0x30
 #define ADXL313_REG_DATA_FORMAT		0x31
 #define ADXL313_REG_DATA_AXIS(index)	(0x32 + ((index) * 2))
 #define ADXL313_REG_FIFO_CTL		0x38
@@ -54,6 +55,8 @@ extern const struct regmap_access_table adxl312_writable_regs_table;
 extern const struct regmap_access_table adxl313_writable_regs_table;
 extern const struct regmap_access_table adxl314_writable_regs_table;
 
+bool adxl313_is_volatile_reg(struct device *dev, unsigned int reg);
+
 enum adxl313_device_type {
 	ADXL312,
 	ADXL313,
diff --git a/drivers/iio/accel/adxl313_core.c b/drivers/iio/accel/adxl313_core.c
index 2f26da5857d4..39f16f97bb4a 100644
--- a/drivers/iio/accel/adxl313_core.c
+++ b/drivers/iio/accel/adxl313_core.c
@@ -46,6 +46,24 @@ const struct regmap_access_table adxl314_readable_regs_table = {
 };
 EXPORT_SYMBOL_NS_GPL(adxl314_readable_regs_table, IIO_ADXL313);
 
+bool adxl313_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case ADXL313_REG_DATA_AXIS(0):
+	case ADXL313_REG_DATA_AXIS(1):
+	case ADXL313_REG_DATA_AXIS(2):
+	case ADXL313_REG_DATA_AXIS(3):
+	case ADXL313_REG_DATA_AXIS(4):
+	case ADXL313_REG_DATA_AXIS(5):
+	case ADXL313_REG_FIFO_STATUS:
+	case ADXL313_REG_INT_SOURCE:
+		return true;
+	default:
+		return false;
+	}
+}
+EXPORT_SYMBOL_NS_GPL(adxl313_is_volatile_reg, "IIO_ADXL313");
+
 static int adxl312_check_id(struct device *dev,
 			    struct adxl313_data *data)
 {
diff --git a/drivers/iio/accel/adxl313_i2c.c b/drivers/iio/accel/adxl313_i2c.c
index a4cf0cf2c5aa..e8636e8ab14f 100644
--- a/drivers/iio/accel/adxl313_i2c.c
+++ b/drivers/iio/accel/adxl313_i2c.c
@@ -21,6 +21,8 @@ static const struct regmap_config adxl31x_i2c_regmap_config[] = {
 		.rd_table	= &adxl312_readable_regs_table,
 		.wr_table	= &adxl312_writable_regs_table,
 		.max_register	= 0x39,
+		.volatile_reg	= adxl313_is_volatile_reg,
+		.cache_type	= REGCACHE_MAPLE,
 	},
 	[ADXL313] = {
 		.reg_bits	= 8,
@@ -28,6 +30,8 @@ static const struct regmap_config adxl31x_i2c_regmap_config[] = {
 		.rd_table	= &adxl313_readable_regs_table,
 		.wr_table	= &adxl313_writable_regs_table,
 		.max_register	= 0x39,
+		.volatile_reg	= adxl313_is_volatile_reg,
+		.cache_type	= REGCACHE_MAPLE,
 	},
 	[ADXL314] = {
 		.reg_bits	= 8,
@@ -35,6 +39,8 @@ static const struct regmap_config adxl31x_i2c_regmap_config[] = {
 		.rd_table	= &adxl314_readable_regs_table,
 		.wr_table	= &adxl314_writable_regs_table,
 		.max_register	= 0x39,
+		.volatile_reg	= adxl313_is_volatile_reg,
+		.cache_type	= REGCACHE_MAPLE,
 	},
 };
 
diff --git a/drivers/iio/accel/adxl313_spi.c b/drivers/iio/accel/adxl313_spi.c
index 9a16b40bff34..68e323e81aeb 100644
--- a/drivers/iio/accel/adxl313_spi.c
+++ b/drivers/iio/accel/adxl313_spi.c
@@ -24,6 +24,8 @@ static const struct regmap_config adxl31x_spi_regmap_config[] = {
 		.max_register	= 0x39,
 		/* Setting bits 7 and 6 enables multiple-byte read */
 		.read_flag_mask	= BIT(7) | BIT(6),
+		.volatile_reg	= adxl313_is_volatile_reg,
+		.cache_type	= REGCACHE_MAPLE,
 	},
 	[ADXL313] = {
 		.reg_bits	= 8,
@@ -33,6 +35,8 @@ static const struct regmap_config adxl31x_spi_regmap_config[] = {
 		.max_register	= 0x39,
 		/* Setting bits 7 and 6 enables multiple-byte read */
 		.read_flag_mask	= BIT(7) | BIT(6),
+		.volatile_reg	= adxl313_is_volatile_reg,
+		.cache_type	= REGCACHE_MAPLE,
 	},
 	[ADXL314] = {
 		.reg_bits	= 8,
@@ -42,6 +46,8 @@ static const struct regmap_config adxl31x_spi_regmap_config[] = {
 		.max_register	= 0x39,
 		/* Setting bits 7 and 6 enables multiple-byte read */
 		.read_flag_mask	= BIT(7) | BIT(6),
+		.volatile_reg	= adxl313_is_volatile_reg,
+		.cache_type	= REGCACHE_MAPLE,
 	},
 };
 
-- 
2.39.5