linux-kernel - Re: [PATCH v3 2/3] iio: imu: mpu6050: add level shifter flag

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Date:   Wed, 27 Sep 2023 19:08:31 +0000
From:   Jean-Baptiste Maneyrol <Jean-Baptiste.Maneyrol@....com>
To:     Andreas Kemnade <andreas@...nade.info>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "bcousson@...libre.com" <bcousson@...libre.com>,
        "tony@...mide.com" <tony@...mide.com>,
        "chenhuiz@...s.com" <chenhuiz@...s.com>,
        "andy.shevchenko@...il.com" <andy.shevchenko@...il.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>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] iio: imu: mpu6050: add level shifter flag

Hello,

looks good for me.

Acked-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@....com>

Thanks,
JB


From: Andreas Kemnade <andreas@...nade.info>
Sent: Wednesday, September 27, 2023 19:32
To: jic23@...nel.org <jic23@...nel.org>; lars@...afoo.de <lars@...afoo.de>; robh+dt@...nel.org <robh+dt@...nel.org>; krzysztof.kozlowski+dt@...aro.org <krzysztof.kozlowski+dt@...aro.org>; conor+dt@...nel.org <conor+dt@...nel.org>; bcousson@...libre.com <bcousson@...libre.com>; tony@...mide.com <tony@...mide.com>; andreas@...nade.info <andreas@...nade.info>; chenhuiz@...s.com <chenhuiz@...s.com>; Jean-Baptiste Maneyrol <Jean-Baptiste.Maneyrol@....com>; andy.shevchenko@...il.com <andy.shevchenko@...il.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>; linux-omap@...r.kernel.org <linux-omap@...r.kernel.org>
Subject: [PATCH v3 2/3] iio: imu: mpu6050: add level shifter flag 
 
Some boards fail in magnetometer probe if level shifter flag is not set, definition was found in the vendor Linux kernel v3. 0. Signed-off-by: Andreas Kemnade <andreas@ kemnade. info> Reviewed-by: Andy Shevchenko <andy. shevchenko@ gmail. com> 
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Some boards fail in magnetometer probe if level shifter flag is not set,
definition was found in the vendor Linux kernel v3.0.

Signed-off-by: Andreas Kemnade <andreas@...nade.info>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.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(+)

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 *st)
 	unsigned int val;
 	int ret;
 
+	/*
+	 * Code based on the vendor Linux kernel v3.0,
+	 * the exact meaning is unknown.
+	 */
+	if (st->chip_type == INV_MPU9150) {
+		unsigned int mask = BIT(7);
+
+		val = st->level_shifter ? mask : 0;
+		ret = regmap_update_bits(st->map, 0x1, mask, val);
+		if (ret)
+			return ret;
+	}
+
 	/* configure i2c master */
 	val = 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>
 
 #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 irq, const char *name,
 	st->irq = irq;
 	st->map = regmap;
 
+	st->level_shifter = device_property_read_bool(dev,
+						      "invensense,level-shifter");
 	pdata = dev_get_platdata(dev);
 	if (!pdata) {
 		result = 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;
 };
 
-- 
2.39.2