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iio: sx9360: Add pre-charge resistor setting

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Add ability to set the precharge internal resistance from the device
tree.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20220429220144.1476049-11-gwendal@chromium.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Gwendal Grignou 2022-04-29 15:01:44 -07:00 committed by Jonathan Cameron
parent 4f3b42b801
commit bc76ea59bb
1 changed files with 14 additions and 1 deletions
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15
drivers/iio/proximity/sx9360.c
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@ -51,6 +51,8 @@
#define SX9360_REG_GNRL_REG_2_FREQ(_r) (SX9360_FOSC_HZ / ((_r) * 8192))
#define SX9360_REG_AFE_CTRL1 0x21
#define SX9360_REG_AFE_CTRL1_RESFILTIN_MASK GENMASK(3, 0)
#define SX9360_REG_AFE_CTRL1_RESFILTIN_0OHMS 0
#define SX9360_REG_AFE_PARAM0_PHR 0x22
#define SX9360_REG_AFE_PARAM1_PHR 0x23
#define SX9360_REG_AFE_PARAM0_PHM 0x24
@ -671,7 +673,7 @@ static const struct sx_common_reg_default sx9360_default_regs[] = {
{ SX9360_REG_GNRL_CTRL1, 0x00 },
{ SX9360_REG_GNRL_CTRL2, SX9360_REG_GNRL_CTRL2_PERIOD_102MS },
{ SX9360_REG_AFE_CTRL1, 0x00 },
{ SX9360_REG_AFE_CTRL1, SX9360_REG_AFE_CTRL1_RESFILTIN_0OHMS },
{ SX9360_REG_AFE_PARAM0_PHR, SX9360_REG_AFE_PARAM0_RSVD |
SX9360_REG_AFE_PARAM0_RESOLUTION_128 },
{ SX9360_REG_AFE_PARAM1_PHR, SX9360_REG_AFE_PARAM1_AGAIN_PHM_6PF |
@ -722,6 +724,17 @@ sx9360_get_default_reg(struct device *dev, int idx,
memcpy(reg_def, &sx9360_default_regs[idx], sizeof(*reg_def));
switch (reg_def->reg) {
case SX9360_REG_AFE_CTRL1:
ret = device_property_read_u32(dev,
"semtech,input-precharge-resistor-ohms",
&raw);
if (ret)
break;
reg_def->def &= ~SX9360_REG_AFE_CTRL1_RESFILTIN_MASK;
reg_def->def |= FIELD_PREP(SX9360_REG_AFE_CTRL1_RESFILTIN_MASK,
raw / 2000);
break;
case SX9360_REG_AFE_PARAM0_PHR:
case SX9360_REG_AFE_PARAM0_PHM:
ret = device_property_read_u32(dev, "semtech,resolution", &raw);