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Message-ID: <71e3e6b1-0821-aff9-df58-7f4425c3c75a@electromag.com.au>
Date: Mon, 10 Dec 2018 16:19:14 +0800
From: Phil Reid <preid@...ctromag.com.au>
To: Anson Huang <anson.huang@....com>,
"jic23@...nel.org" <jic23@...nel.org>,
"knaack.h@....de" <knaack.h@....de>,
"lars@...afoo.de" <lars@...afoo.de>,
"pmeerw@...erw.net" <pmeerw@...erw.net>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"mark.rutland@....com" <mark.rutland@....com>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"festevam@...il.com" <festevam@...il.com>
Cc: dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH V2] iio: magnetometer: mag3110: add optional vdd/vddio
regulator operation support
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
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