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Mon, 10 Dec 2018 02:25:33 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=0QvhXRQPCCpndtGk1uzpCcDRU3N5xsPaMI3EtpGWSo0=; b=wSAD6RXwJ/xcXPxiF7SC504NQxpvY3d+MeDCaL1yIrX5v0cCWw1DVWk4GIXtboHE1zouDmMf26ZliZklkFTjRplI92JkmaDjkUaYnkQBID29qqI2D36P4+56ti81EgziCSNcRU77Ms2FckGUwrJSe7qnXIHbH15xMXN6Ej7HYgQ= Received: from DB3PR0402MB3916.eurprd04.prod.outlook.com (52.134.72.18) by DB3PR0402MB3931.eurprd04.prod.outlook.com (52.134.65.153) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1404.22; Mon, 10 Dec 2018 07:25:28 +0000 Received: from DB3PR0402MB3916.eurprd04.prod.outlook.com ([fe80::adf8:f49d:deb4:58fd]) by DB3PR0402MB3916.eurprd04.prod.outlook.com ([fe80::adf8:f49d:deb4:58fd%3]) with mapi id 15.20.1404.026; Mon, 10 Dec 2018 07:25:28 +0000 From: Anson Huang To: "jic23@kernel.org" , "knaack.h@gmx.de" , "lars@metafoo.de" , "pmeerw@pmeerw.net" , "robh+dt@kernel.org" , "mark.rutland@arm.com" , "rtresidd@electromag.com.au" , "gustavo@embeddedor.com" , "gregkh@linuxfoundation.org" , Leonard Crestez , "martink@posteo.de" , "linux-iio@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "festevam@gmail.com" CC: dl-linux-imx Subject: [PATCH V2 2/2] iio: accell: mma8452: add optional vdd/vddio regulator operation support Thread-Topic: [PATCH V2 2/2] iio: accell: mma8452: add optional vdd/vddio regulator operation support Thread-Index: AQHUkFmG8lbE6zLokESHut9HIV3twg== Date: Mon, 10 Dec 2018 07:25:28 +0000 Message-ID: <1544426368-16415-2-git-send-email-Anson.Huang@nxp.com> References: <1544426368-16415-1-git-send-email-Anson.Huang@nxp.com> In-Reply-To: <1544426368-16415-1-git-send-email-Anson.Huang@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.7.4 x-clientproxiedby: HK0PR03CA0033.apcprd03.prod.outlook.com (2603:1096:203:2f::21) To DB3PR0402MB3916.eurprd04.prod.outlook.com (2603:10a6:8:10::18) authentication-results: spf=none (sender IP is ) smtp.mailfrom=anson.huang@nxp.com; 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received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: DK+Y+C2ATvAdXOvrwFP8b9yp6vDDl6xLYHNZC/iIgt5ht1Z8sBzAQvbASK6H1fxUuVdMOydGiaWJYP+8laVisflFHiSFoOPYXEvqBHbCg7eYdIn7q+wV/3ou3s8G6RqPG3ZlrxEeNYJx1l7gVQ9LruiL47QPZH+RArFXYe3wKgIs8Nsbvaybwiyl8b/Pl7ATzuMNQvwJ+VGTDvDTYTw37nJFmFDfbTM8EjBFADKkP18tF39yPpN+DsRiTyOf5RgCsmojQYYnaOsy7nvMgxknJBbCKcvuEfaCUfJ6Ye3i+q31vxRa/4kh3mKCQ4xvoNAC spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 43d6d475-dbb5-4c8d-d7a5-08d65e70a8ee X-MS-Exchange-CrossTenant-originalarrivaltime: 10 Dec 2018 07:25:28.5728 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB3PR0402MB3931 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The accelerometer's power supply could be controlled by regulator on some platforms, such as i.MX6Q-SABRESD board, the mma8451's power supply is controlled by a GPIO fixed regulator, need to make sure the regulator is enabled before any communication with mma8451, this patch adds optional vdd/vddio regulator operation support. Signed-off-by: Anson Huang --- ChangeLog since V1: - Add defer_probe check if the return value from devm_regulator_get_opt= ional is ERR_PTR(-EPROBE_DEFER); - Replace the "vcc" with "vdd" according to datasheet, and add optional= "vddio" supply as well since mma8452 also has a vddio supply. --- drivers/iio/accel/mma8452.c | 151 ++++++++++++++++++++++++++++++++++++++++= +++- 1 file changed, 149 insertions(+), 2 deletions(-) diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c index 421a0a8..18dcf33 100644 --- a/drivers/iio/accel/mma8452.c +++ b/drivers/iio/accel/mma8452.c @@ -31,6 +31,7 @@ #include #include #include +#include =20 #define MMA8452_STATUS 0x00 #define MMA8452_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0)) @@ -107,6 +108,8 @@ struct mma8452_data { u8 data_cfg; const struct mma_chip_info *chip_info; int sleep_val; + struct regulator *vdd_reg; + struct regulator *vddio_reg; }; =20 /** @@ -1533,6 +1536,27 @@ static int mma8452_probe(struct i2c_client *client, data->client =3D client; mutex_init(&data->lock); data->chip_info =3D match->data; + data->vdd_reg =3D devm_regulator_get_optional(&client->dev, "vdd"); + if (!IS_ERR(data->vdd_reg)) { + ret =3D regulator_enable(data->vdd_reg); + if (ret) { + dev_err(&client->dev, "failed to enable VDD regulator\n"); + return ret; + } + } else if (data->vdd_reg =3D=3D ERR_PTR(-EPROBE_DEFER)) { + return -EPROBE_DEFER; + } + + data->vddio_reg =3D devm_regulator_get_optional(&client->dev, "vddio"); + if (!IS_ERR(data->vddio_reg)) { + ret =3D regulator_enable(data->vddio_reg); + if (ret) { + dev_err(&client->dev, "failed to enable VDDIO regulator\n"); + return ret; + } + } else if (data->vddio_reg =3D=3D ERR_PTR(-EPROBE_DEFER)) { + return -EPROBE_DEFER; + } =20 ret =3D i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I); if (ret < 0) @@ -1667,6 +1691,8 @@ static int mma8452_probe(struct i2c_client *client, static int mma8452_remove(struct i2c_client *client) { struct iio_dev *indio_dev =3D i2c_get_clientdata(client); + struct mma8452_data *data =3D iio_priv(indio_dev); + int ret; =20 iio_device_unregister(indio_dev); =20 @@ -1678,6 +1704,21 @@ static int mma8452_remove(struct i2c_client *client) mma8452_trigger_cleanup(indio_dev); mma8452_standby(iio_priv(indio_dev)); =20 + if (!IS_ERR(data->vdd_reg)) { + ret =3D regulator_disable(data->vdd_reg); + if (ret) { + dev_err(&client->dev, "failed to disable VDD regulator\n"); + return ret; + } + } + if (!IS_ERR(data->vddio_reg)) { + ret =3D regulator_disable(data->vddio_reg); + if (ret) { + dev_err(&client->dev, "failed to disable VDDIO regulator\n"); + return ret; + } + } + return 0; } =20 @@ -1696,6 +1737,21 @@ static int mma8452_runtime_suspend(struct device *de= v) return -EAGAIN; } =20 + if (!IS_ERR(data->vdd_reg)) { + ret =3D regulator_disable(data->vdd_reg); + if (ret) { + dev_err(dev, "failed to disable VDD regulator\n"); + return ret; + } + } + if (!IS_ERR(data->vddio_reg)) { + ret =3D regulator_disable(data->vddio_reg); + if (ret) { + dev_err(dev, "failed to disable VDDIO regulator\n"); + return ret; + } + } + return 0; } =20 @@ -1705,6 +1761,21 @@ static int mma8452_runtime_resume(struct device *dev= ) struct mma8452_data *data =3D iio_priv(indio_dev); int ret, sleep_val; =20 + if (!IS_ERR(data->vdd_reg)) { + ret =3D regulator_enable(data->vdd_reg); + if (ret) { + dev_err(dev, "failed to enable VDD regulator\n"); + return ret; + } + } + if (!IS_ERR(data->vddio_reg)) { + ret =3D regulator_enable(data->vddio_reg); + if (ret) { + dev_err(dev, "failed to enable VDDIO regulator\n"); + return ret; + } + } + ret =3D mma8452_active(data); if (ret < 0) return ret; @@ -1723,14 +1794,90 @@ static int mma8452_runtime_resume(struct device *de= v) #ifdef CONFIG_PM_SLEEP static int mma8452_suspend(struct device *dev) { - return mma8452_standby(iio_priv(i2c_get_clientdata( + struct iio_dev *indio_dev =3D i2c_get_clientdata(to_i2c_client(dev)); + struct mma8452_data *data =3D iio_priv(indio_dev); + int ret; + + if (!IS_ERR(data->vdd_reg)) { + ret =3D regulator_enable(data->vdd_reg); + if (ret) { + dev_err(dev, "failed to enable VDD regulator\n"); + return ret; + } + } + if (!IS_ERR(data->vddio_reg)) { + ret =3D regulator_enable(data->vddio_reg); + if (ret) { + dev_err(dev, "failed to enable VDDIO regulator\n"); + return ret; + } + } + + ret =3D mma8452_standby(iio_priv(i2c_get_clientdata( to_i2c_client(dev)))); + if (ret) + return ret; + + if (!IS_ERR(data->vdd_reg)) { + ret =3D regulator_disable(data->vdd_reg); + if (ret) { + dev_err(dev, "failed to disable VDD regulator\n"); + return ret; + } + } + if (!IS_ERR(data->vddio_reg)) { + ret =3D regulator_disable(data->vddio_reg); + if (ret) { + dev_err(dev, "failed to disable VDDIO regulator\n"); + return ret; + } + } + + return 0; } =20 static int mma8452_resume(struct device *dev) { - return mma8452_active(iio_priv(i2c_get_clientdata( + struct iio_dev *indio_dev =3D i2c_get_clientdata(to_i2c_client(dev)); + struct mma8452_data *data =3D iio_priv(indio_dev); + int ret; + + if (!IS_ERR(data->vdd_reg)) { + ret =3D regulator_enable(data->vdd_reg); + if (ret) { + dev_err(dev, "failed to enable VDD regulator\n"); + return ret; + } + } + if (!IS_ERR(data->vddio_reg)) { + ret =3D regulator_enable(data->vddio_reg); + if (ret) { + dev_err(dev, "failed to enable VDDIO regulator\n"); + return ret; + } + } + + ret =3D mma8452_active(iio_priv(i2c_get_clientdata( to_i2c_client(dev)))); + if (ret) + return ret; + + if (!IS_ERR(data->vdd_reg)) { + ret =3D regulator_disable(data->vdd_reg); + if (ret) { + dev_err(dev, "failed to disable VDD regulator\n"); + return ret; + } + } + if (!IS_ERR(data->vddio_reg)) { + ret =3D regulator_disable(data->vddio_reg); + if (ret) { + dev_err(dev, "failed to disable VDDIO regulator\n"); + return ret; + } + } + + return 0; } #endif =20 --=20 2.7.4