iio: sx9324: Add setting for CS idle mode

Based on device tree setting, set the CS idle mode.

Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20220503193937.3794477-3-swboyd@chromium.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/proximity/sx9324.c b/drivers/iio/proximity/sx9324.c
index 7f367f6..c7fc75f 100644 (file)
--- a/drivers/iio/proximity/sx9324.c
+++ b/drivers/iio/proximity/sx9324.c
@@ -57,6 +57,11 @@
        GENMASK(SX9324_REG_AFE_CTRL0_RINT_SHIFT + 1, \
                SX9324_REG_AFE_CTRL0_RINT_SHIFT)
 #define SX9324_REG_AFE_CTRL0_RINT_LOWEST       0x00
+#define SX9324_REG_AFE_CTRL0_CSIDLE_SHIFT      4
+#define SX9324_REG_AFE_CTRL0_CSIDLE_MASK \
+       GENMASK(SX9324_REG_AFE_CTRL0_CSIDLE_SHIFT + 1, \
+               SX9324_REG_AFE_CTRL0_CSIDLE_SHIFT)
+#define SX9324_REG_AFE_CTRL0_RINT_LOWEST       0x00
 #define SX9324_REG_AFE_CTRL1           0x21
 #define SX9324_REG_AFE_CTRL2           0x22
 #define SX9324_REG_AFE_CTRL3           0x23
@@ -872,6 +877,8 @@ sx9324_get_default_reg(struct device *dev, int idx,
 {
        static const char * const sx9324_rints[] = { "lowest", "low", "high",
                "highest" };
+       static const char * const sx9324_csidle[] = { "hi-z", "hi-z", "gnd",
+               "vdd" };
 #define SX9324_PIN_DEF "semtech,ph0-pin"
 #define SX9324_RESOLUTION_DEF "semtech,ph01-resolution"
 #define SX9324_PROXRAW_DEF "semtech,ph01-proxraw-strength"
@@ -901,6 +908,15 @@ sx9324_get_default_reg(struct device *dev, int idx,
                reg_def->def = raw;
                break;
        case SX9324_REG_AFE_CTRL0:
+               ret = device_property_read_string(dev,
+                               "semtech,cs-idle-sleep", &res);
+               if (!ret)
+                       ret = match_string(sx9324_csidle, ARRAY_SIZE(sx9324_csidle), res);
+               if (ret >= 0) {
+                       reg_def->def &= ~SX9324_REG_AFE_CTRL0_CSIDLE_MASK;
+                       reg_def->def |= ret << SX9324_REG_AFE_CTRL0_CSIDLE_SHIFT;
+               }
+
                ret = device_property_read_string(dev,
                                "semtech,int-comp-resistor", &res);
                if (ret)