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[media] rtl2832: use regmap reg cache

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Enable regmap register cache in order to reduce IO.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Antti Palosaari 2014-12-14 16:23:28 -03:00 committed by Mauro Carvalho Chehab
parent e20b0cf2f3
commit dcadb82a7a
1 changed files with 18 additions and 0 deletions
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18
drivers/media/dvb-frontends/rtl2832.c
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@ -986,6 +986,22 @@ static struct dvb_frontend_ops rtl2832_ops = {
.read_ber = rtl2832_read_ber,
};
static bool rtl2832_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case 0x305:
case 0x33c:
case 0x34e:
case 0x351:
case 0x40c ... 0x40d:
return true;
default:
break;
}
return false;
}
/*
* We implement own I2C access routines for regmap in order to get manual access
* to I2C adapter lock, which is needed for I2C mux adapter.
@ -1240,9 +1256,11 @@ static int rtl2832_probe(struct i2c_client *client,
static const struct regmap_config regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_reg = rtl2832_volatile_reg,
.max_register = 5 * 0x100,
.ranges = regmap_range_cfg,
.num_ranges = ARRAY_SIZE(regmap_range_cfg),
.cache_type = REGCACHE_RBTREE,
};
dev_dbg(&client->dev, "\n");