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mfd: MAX96745: disable remote control-channel link on this link

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there can be multiple SerDes applications on the same I2C BUS.
the serializer can attach multiple deiserializers which have
the same I2C slave device address, to avoid I2C communication
conflicts, driver should disable remote control-channel link
after accessing.

Change-Id: I099caf597835cc34f34231231fbaddf2c5d03288
Signed-off-by: Guochun Huang <hero.huang@rock-chips.com>
This commit is contained in:
Guochun Huang
2022-05-27 08:29:53 +00:00
committed by Tao Huang
parent 4f64073a92
commit 81e27b972c
2 changed files with 32 additions and 14 deletions
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43
drivers/mfd/max96745.c
View File

@@ -43,18 +43,26 @@ static int max96745_select(struct i2c_mux_core *muxc, u32 chan)
{
struct max96745 *max96745 = dev_get_drvdata(muxc->dev);
if (chan == 0) {
regmap_update_bits(max96745->regmap, 0x0028, LINK_EN,
FIELD_PREP(LINK_EN, 1));
} else if (chan == 1) {
regmap_update_bits(max96745->regmap, 0x0032, LINK_EN,
FIELD_PREP(LINK_EN, 1));
} else {
regmap_update_bits(max96745->regmap, 0x0028, LINK_EN,
FIELD_PREP(LINK_EN, 1));
regmap_update_bits(max96745->regmap, 0x0032, LINK_EN,
FIELD_PREP(LINK_EN, 1));
}
if (chan == 1)
regmap_update_bits(max96745->regmap, 0x0086, DIS_REM_CC,
FIELD_PREP(DIS_REM_CC, 0));
else
regmap_update_bits(max96745->regmap, 0x0076, DIS_REM_CC,
FIELD_PREP(DIS_REM_CC, 0));
return 0;
}
static int max96745_deselect(struct i2c_mux_core *muxc, u32 chan)
{
struct max96745 *max96745 = dev_get_drvdata(muxc->dev);
if (chan == 1)
regmap_update_bits(max96745->regmap, 0x0086, DIS_REM_CC,
FIELD_PREP(DIS_REM_CC, 1));
else
regmap_update_bits(max96745->regmap, 0x0076, DIS_REM_CC,
FIELD_PREP(DIS_REM_CC, 1));
return 0;
}
@@ -88,6 +96,12 @@ static int max96745_power_on(struct max96745 *max96745)
msleep(100);
regmap_update_bits(max96745->regmap, 0x0076, DIS_REM_CC,
FIELD_PREP(DIS_REM_CC, 1));
regmap_update_bits(max96745->regmap, 0x0086, DIS_REM_CC,
FIELD_PREP(DIS_REM_CC, 1));
return 0;
}
@@ -110,8 +124,9 @@ static int max96745_i2c_probe(struct i2c_client *client)
if (!max96745)
return -ENOMEM;
max96745->muxc = i2c_mux_alloc(client->adapter, dev, nr, 0,
I2C_MUX_LOCKED, max96745_select, NULL);
max96745->muxc = i2c_mux_alloc(client->adapter, dev, nr,
0, I2C_MUX_LOCKED,
max96745_select, max96745_deselect);
if (!max96745->muxc)
return -ENOMEM;

3
include/linux/mfd/max96745.h
View File

@@ -33,6 +33,9 @@
/* 002Ah, 0034h */
#define LINK_LOCKED BIT(0)
/* 0076h, 0086h */
#define DIS_REM_CC BIT(7)
/* 0100h */
#define VID_LINK_SEL GENMASK(2, 1)
#define VID_TX_EN BIT(0)