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charset="utf-8" The MT9M114 supports the different slew rates (0 to 7) on the output pads. At the moment, this is hardcoded to 7 (the fastest rate). The user might want to change this values due to EMC requirements. Read the 'onnn,slew-rate' from the DT and configure the pad slew rates of the output pads accordingly in mt9m114_initialize(). Remove the hardcoded slew rate setting from the mt9m114_init table. Signed-off-by: Mathis Foerst --- drivers/media/i2c/mt9m114.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/drivers/media/i2c/mt9m114.c b/drivers/media/i2c/mt9m114.c index 79c97ab19be9..df694a3e14d5 100644 --- a/drivers/media/i2c/mt9m114.c +++ b/drivers/media/i2c/mt9m114.c @@ -42,6 +42,9 @@ #define MT9M114_RESET_AND_MISC_CONTROL CCI_REG16(0x001a) #define MT9M114_RESET_SOC BIT(0) #define MT9M114_PAD_SLEW CCI_REG16(0x001e) +#define MT9M114_PAD_SLEW_MIN 0x00 +#define MT9M114_PAD_SLEW_MAX 0x07 +#define MT9M114_PAD_SLEW_DEFAULT 0x07 #define MT9M114_PAD_CONTROL CCI_REG16(0x0032) =20 /* XDMA registers */ @@ -388,6 +391,7 @@ struct mt9m114 { =20 unsigned int pixrate; bool streaming; + u32 pad_slew_rate; =20 /* Pixel Array */ struct { @@ -645,9 +649,6 @@ static const struct cci_reg_sequence mt9m114_init[] =3D= { { MT9M114_CAM_SENSOR_CFG_FINE_INTEG_TIME_MAX, 1459 }, { MT9M114_CAM_SENSOR_CFG_FINE_CORRECTION, 96 }, { MT9M114_CAM_SENSOR_CFG_REG_0_DATA, 32 }, - - /* Miscellaneous settings */ - { MT9M114_PAD_SLEW, 0x0777 }, }; =20 /* -----------------------------------------------------------------------= ------ @@ -778,6 +779,13 @@ static int mt9m114_initialize(struct mt9m114 *sensor) if (ret < 0) return ret; =20 + value =3D (sensor->pad_slew_rate & 0xF) + | (sensor->pad_slew_rate & 0xF) << 4 + | (sensor->pad_slew_rate & 0xF) << 8; + cci_write(sensor->regmap, MT9M114_PAD_SLEW, value, &ret); + if (ret < 0) + return ret; + ret =3D mt9m114_set_state(sensor, MT9M114_SYS_STATE_ENTER_CONFIG_CHANGE); if (ret < 0) return ret; @@ -2357,6 +2365,8 @@ static int mt9m114_parse_dt(struct mt9m114 *sensor) { struct fwnode_handle *fwnode =3D dev_fwnode(&sensor->client->dev); struct fwnode_handle *ep; + struct device_node *dev_node =3D sensor->client->dev.of_node; + u32 slew_rate; int ret; =20 ep =3D fwnode_graph_get_next_endpoint(fwnode, NULL); @@ -2385,6 +2395,11 @@ static int mt9m114_parse_dt(struct mt9m114 *sensor) goto error; } =20 + ret =3D of_property_read_u32(dev_node, "onnn,slew-rate", &slew_rate); + if (ret || slew_rate < MT9M114_PAD_SLEW_MIN || slew_rate > MT9M114_PAD_SL= EW_MAX) + slew_rate =3D MT9M114_PAD_SLEW_DEFAULT; + sensor->pad_slew_rate =3D slew_rate; + return 0; =20 error: --=20 2.34.1