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media: i2c: ds90ub953: Speed-up I2C watchdog timer

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On the I2C bus for remote clients (sensors), by default the watchdog
timer expires in 1s. To allow for a quicker system bring-up time, TI
recommends to speed it up to 50us [1].

[1]: Section 7.3.1.1 - https://www.ti.com/lit/gpn/ds90ub953-q1

Signed-off-by: Jai Luthra <jai.luthra@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
This commit is contained in:
Jai Luthra
2025-03-03 21:32:11 +05:30
committed by Hans Verkuil
parent d3be2fcde6
commit dbad194b0b
1 changed files with 10 additions and 1 deletions
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11
drivers/media/i2c/ds90ub953.c
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@@ -54,6 +54,10 @@
#define UB953_REG_CLKOUT_CTRL0 0x06
#define UB953_REG_CLKOUT_CTRL1 0x07
#define UB953_REG_I2C_CONTROL2 0x0a
#define UB953_REG_I2C_CONTROL2_SDA_OUTPUT_SETUP_SHIFT 4
#define UB953_REG_I2C_CONTROL2_BUS_SPEEDUP BIT(1)
#define UB953_REG_SCL_HIGH_TIME 0x0b
#define UB953_REG_SCL_LOW_TIME 0x0c
@@ -1320,7 +1324,12 @@ static int ub953_hw_init(struct ub953_data *priv)
if (ret)
return ret;
return 0;
v = 1U << UB953_REG_I2C_CONTROL2_SDA_OUTPUT_SETUP_SHIFT;
v |= UB953_REG_I2C_CONTROL2_BUS_SPEEDUP;
ret = ub953_write(priv, UB953_REG_I2C_CONTROL2, v, NULL);
return ret;
}
static int ub953_subdev_init(struct ub953_data *priv)