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Date:   Sat, 30 Sep 2023 17:50:39 +0100
From:   Jonathan Cameron <jic23@kernel.org>
To:     Jean-Baptiste Maneyrol <Jean-Baptiste.Maneyrol@tdk.com>
Cc:     Andreas Kemnade <andreas@kemnade.info>,
        "lars@metafoo.de" <lars@metafoo.de>,
        "robh+dt@kernel.org" <robh+dt@kernel.org>,
        "krzysztof.kozlowski+dt@linaro.org" 
        <krzysztof.kozlowski+dt@linaro.org>,
        "conor+dt@kernel.org" <conor+dt@kernel.org>,
        "bcousson@baylibre.com" <bcousson@baylibre.com>,
        "tony@atomide.com" <tony@atomide.com>,
        "chenhuiz@axis.com" <chenhuiz@axis.com>,
        "andy.shevchenko@gmail.com" <andy.shevchenko@gmail.com>,
        "linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>
Subject: Re: [PATCH v3 2/3] iio: imu: mpu6050: add level shifter flag
Message-ID: <20230930175039.2d311d6b@jic23-huawei>
In-Reply-To: <FR3P281MB1757489A956DC26596AA90B6CEC2A@FR3P281MB1757.DEUP281.PROD.OUTLOOK.COM>
References: <20230927173245.2151083-1-andreas@kemnade.info>
        <20230927173245.2151083-3-andreas@kemnade.info>
        <FR3P281MB1757489A956DC26596AA90B6CEC2A@FR3P281MB1757.DEUP281.PROD.OUTLOOK.COM>
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On Wed, 27 Sep 2023 19:08:31 +0000
Jean-Baptiste Maneyrol <Jean-Baptiste.Maneyrol@tdk.com> wrote:

> Hello,
>=20
> looks good for me.
>=20
> Acked-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>

Applied patches 1 and 2 to the togreg branch of iio.git which I will
initially push out as testing to let 0-day poke at it,

Thanks,

Jonathan

>=20
> Thanks,
> JB
>=20
>=20
> From: Andreas Kemnade <andreas@kemnade.info>
> Sent: Wednesday, September 27, 2023 19:32
> To: jic23@kernel.org <jic23@kernel.org>; lars@metafoo.de <lars@metafoo.de=
>; robh+dt@kernel.org <robh+dt@kernel.org>; krzysztof.kozlowski+dt@linaro.o=
rg <krzysztof.kozlowski+dt@linaro.org>; conor+dt@kernel.org <conor+dt@kerne=
l.org>; bcousson@baylibre.com <bcousson@baylibre.com>; tony@atomide.com <to=
ny@atomide.com>; andreas@kemnade.info <andreas@kemnade.info>; chenhuiz@axis=
.com <chenhuiz@axis.com>; Jean-Baptiste Maneyrol <Jean-Baptiste.Maneyrol@td=
k.com>; andy.shevchenko@gmail.com <andy.shevchenko@gmail.com>; linux-iio@vg=
er.kernel.org <linux-iio@vger.kernel.org>; devicetree@vger.kernel.org <devi=
cetree@vger.kernel.org>; linux-kernel@vger.kernel.org <linux-kernel@vger.ke=
rnel.org>; linux-omap@vger.kernel.org <linux-omap@vger.kernel.org>
> Subject: [PATCH v3 2/3] iio: imu: mpu6050: add level shifter flag=20
> =C2=A0
> Some boards fail in magnetometer probe if level shifter flag is not set, =
definition was found in the vendor Linux kernel v3.=E2=80=8A0. Signed-off-b=
y: Andreas Kemnade <andreas@=E2=80=8Akemnade.=E2=80=8Ainfo> Reviewed-by: An=
dy Shevchenko <andy.=E2=80=8Ashevchenko@=E2=80=8Agmail.=E2=80=8Acom>=20
> ZjQcmQRYFpfptBannerStart
> This Message Is From an External Sender=20
> This message came from outside your organization.=20
> =C2=A0
> ZjQcmQRYFpfptBannerEnd
> Some boards fail in magnetometer probe if level shifter flag is not set,
> definition was found in the vendor Linux kernel v3.0.
>=20
> Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> ---
>  drivers/iio/imu/inv_mpu6050/inv_mpu_aux.c  | 13 +++++++++++++
>  drivers/iio/imu/inv_mpu6050/inv_mpu_core.c |  3 +++
>  drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h  |  1 +
>  3 files changed, 17 insertions(+)
>=20
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_aux.c b/drivers/iio/imu/=
inv_mpu6050/inv_mpu_aux.c
> index 7327e5723f961..8a7f2911905af 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_aux.c
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_aux.c
> @@ -71,6 +71,19 @@ int inv_mpu_aux_init(const struct inv_mpu6050_state *s=
t)
>  	unsigned int val;
>  	int ret;
> =20
> +	/*
> +	 * Code based on the vendor Linux kernel v3.0,
> +	 * the exact meaning is unknown.
> +	 */
> +	if (st->chip_type =3D=3D INV_MPU9150) {
> +		unsigned int mask =3D BIT(7);
> +
> +		val =3D st->level_shifter ? mask : 0;
> +		ret =3D regmap_update_bits(st->map, 0x1, mask, val);
> +		if (ret)
> +			return ret;
> +	}
> +
>  	/* configure i2c master */
>  	val =3D INV_MPU6050_BITS_I2C_MST_CLK_400KHZ |
>  			INV_MPU6050_BIT_WAIT_FOR_ES;
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu=
/inv_mpu6050/inv_mpu_core.c
> index 29f906c884bd8..3fbeef1a70186 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> @@ -17,6 +17,7 @@
>  #include <linux/regulator/consumer.h>
>  #include <linux/pm.h>
>  #include <linux/pm_runtime.h>
> +#include <linux/property.h>
> =20
>  #include <linux/iio/common/inv_sensors_timestamp.h>
>  #include <linux/iio/iio.h>
> @@ -1495,6 +1496,8 @@ int inv_mpu_core_probe(struct regmap *regmap, int i=
rq, const char *name,
>  	st->irq =3D irq;
>  	st->map =3D regmap;
> =20
> +	st->level_shifter =3D device_property_read_bool(dev,
> +						      "invensense,level-shifter");
>  	pdata =3D dev_get_platdata(dev);
>  	if (!pdata) {
>  		result =3D iio_read_mount_matrix(dev, &st->orientation);
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/=
inv_mpu6050/inv_mpu_iio.h
> index ed5a96e78df05..7eba1439c8093 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
> @@ -203,6 +203,7 @@ struct inv_mpu6050_state {
>  	s32 magn_raw_to_gauss[3];
>  	struct iio_mount_matrix magn_orient;
>  	unsigned int suspended_sensors;
> +	bool level_shifter;
>  	u8 *data;
>  };
> =20