G'day Anson,
On 10/12/2018 3:17 PM, Anson Huang wrote:
The magnetometer's power supply could be controlled by regulator
on some platforms, such as i.MX6Q-SABRESD board, the mag3110's
power supply is controlled by a GPIO fixed regulator, need to make
sure the regulator is enabled before any communication with mag3110,
this patch adds optional vdd/vddio regulator operation support.
[snip]
+
+ data->vdd_reg = devm_regulator_get_optional(&client->dev, "vdd");
+ if (!IS_ERR(data->vdd_reg)) {
+ ret = regulator_enable(data->vdd_reg);
+ if (ret) {
+ dev_err(&client->dev, "failed to enable VDD regulator\n");
+ return ret;
+ }
+ } else if (data->vdd_reg == ERR_PTR(-EPROBE_DEFER)) {
+ return -EPROBE_DEFER;
+ }
+
IANAE, but normally the return pattern for devm_regulator_get_optional
if (!IS_ERR(reg)) {
regulator_enable ...
} else {
ret = PTR_ERR(reg);
if (ret != -ENODEV)
return ret;
}
--
Regards
Phil
