rtc: abx80x: Provide debug feedback for invalid dt properties

When the user provides an invalid value for tc-diode or
tc-resistor generate a debug message instead of silently
ignoring it.

Signed-off-by: Kevin P. Fleming <kevin+linux@km6g.us>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20200530122956.360689-1-kevin+linux@km6g.us

diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
index 67bf3b8..803725b 100644 (file)
--- a/drivers/rtc/rtc-abx80x.c
+++ b/drivers/rtc/rtc-abx80x.c
@@ -555,8 +555,9 @@ static const struct rtc_class_ops abx80x_rtc_ops = {
        .ioctl          = abx80x_ioctl,
 };
 
-static int abx80x_dt_trickle_cfg(struct device_node *np)
+static int abx80x_dt_trickle_cfg(struct i2c_client *client)
 {
+       struct device_node *np = client->dev.of_node;
        const char *diode;
        int trickle_cfg = 0;
        int i, ret;
@@ -566,12 +567,14 @@ static int abx80x_dt_trickle_cfg(struct device_node *np)
        if (ret)
                return ret;
 
-       if (!strcmp(diode, "standard"))
+       if (!strcmp(diode, "standard")) {
                trickle_cfg |= ABX8XX_TRICKLE_STANDARD_DIODE;
-       else if (!strcmp(diode, "schottky"))
+       } else if (!strcmp(diode, "schottky")) {
                trickle_cfg |= ABX8XX_TRICKLE_SCHOTTKY_DIODE;
-       else
+       } else {
+               dev_dbg(&client->dev, "Invalid tc-diode value: %s\n", diode);
                return -EINVAL;
+       }
 
        ret = of_property_read_u32(np, "abracon,tc-resistor", &tmp);
        if (ret)
@@ -581,8 +584,10 @@ static int abx80x_dt_trickle_cfg(struct device_node *np)
                if (trickle_resistors[i] == tmp)
                        break;
 
-       if (i == sizeof(trickle_resistors))
+       if (i == sizeof(trickle_resistors)) {
+               dev_dbg(&client->dev, "Invalid tc-resistor value: %u\n", tmp);
                return -EINVAL;
+       }
 
        return (trickle_cfg | i);
 }
@@ -794,7 +799,7 @@ static int abx80x_probe(struct i2c_client *client,
        }
 
        if (np && abx80x_caps[part].has_tc)
-               trickle_cfg = abx80x_dt_trickle_cfg(np);
+               trickle_cfg = abx80x_dt_trickle_cfg(client);
 
        if (trickle_cfg > 0) {
                dev_info(&client->dev, "Enabling trickle charger: %02x\n",